Sliding contact switch

Information

  • Patent Grant
  • 7498538
  • Patent Number
    7,498,538
  • Date Filed
    Friday, July 20, 2007
    16 years ago
  • Date Issued
    Tuesday, March 3, 2009
    15 years ago
Abstract
An electrical contact assembly includes an electrical terminal, a push button, and a contact member adapted to be in electrical contact with the electrical terminal when the push button is compressed. The contact member has a first contact portion forming a first angle with a surface of the electrical terminal, and a second contact portion forming a second angle with the surface of the electrical terminal. The second angle is smaller than the first angle, and the second contact portion is adapted to slide on the surface of the electrical terminal when the push button is compressed.
Description
FIELD OF THE INVENTION

The present invention relates to an electrical system, and in particular to an electrical switch.


BACKGROUND OF THE INVENTION

Electrical switches are used to make electrical connections between electrical wires. Many electrical system failures result from bad contacts at electrical switches. The bad contacts may result from contaminations at contact surfaces or terminals, or may result from wearing of the contact surfaces and/or terminals.


BRIEF SUMMARY OF THE INVENTION

The present invention provides a method and system for making a reliable and durable contact between electrical terminals.


In one aspect, an electrical contact assembly according to an embodiment of the present invention includes an electrical terminal, a push button, and a contact member. When the push button is compressed, the contact member comes in electrical contact with the terminal. The contact member has a first contact portion forming a first angle with a surface of the electrical terminal, and a second contact portion forming a second angle with the surface of the electrical terminal. The second angle is smaller than the first angle, and the second contact portion is adapted to slide on the surface of the electrical terminal when the push button is compressed.


The electrical contact assembly may include a spring member coupled to the contact member and to the push button. The assembly may have a housing and a cover together substantially enclosing the electrical terminal and the contact member. The electrical terminal may be adapted for retaining, and being in electrical contact with, an electrical wire.


The contact member of the assembly may be formed unitarily, for example, using beryllium copper. Alternatively, portions of the contact member may be formed separately and then coupled together.


The contact member is adapted to provide a resilient force between the contact member and the electrical terminal when in electrical contact with the electrical terminal. The resilient force at least partially results from a change in a relative angle between the first contact portion and the second contact portion.


These and other features, aspects and advantages of the present invention will become understood with reference to the following description, appended claims and accompanying figures.





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1A is an exploded view of an electrical contact assembly according to an embodiment of the present invention.



FIG. 1B shows another exploded view of the electrical contact assembly of FIG. 1A from a different angle.



FIG. 2 is a perspective view of the assembled electrical contact assembly of FIGS. 1A and 1B.



FIG. 3 is a perspective view of a partial, internal structure of the electrical contact assembly showing a contact member, a spring and a pair of electrical terminals, according to an embodiment of the invention.



FIG. 4 is a cross-sectional view of the assembled contact assembly in its disconnected, or open, state, according to an embodiment of the invention.



FIG. 5 shows the contact member and the electrical terminals of the contact assembly in greater details, according to an embodiment of the invention.



FIG. 6A is a cross-sectional view of the assembled contact assembly in its connected, or closed, state, according to an embodiment of the invention.



FIG. 6B is a perspective view comparing the open and the closed states of the contact assembly.



FIG. 7A shows relative positions of the contact member and the electrical terminals, according to an embodiment of the invention.



FIG. 7B shows the contact member in essentially complete contact with the electrical terminals, according to an embodiment of the invention.



FIG. 7C shows the contact member in essentially complete contact with the electrical terminals without bending the top portion of the contact member, according to another embodiment of the invention.



FIG. 7D shows the contact member in essentially complete contact with the electrical terminals, according to another embodiment of the invention.



FIG. 8A shows a portion of an electrical system including a plurality of contact assemblies according to an embodiment of the invention.



FIG. 8B shows the electrical system with the contact assemblies removed, exposing the electrical terminals, according to an embodiment of the invention.



FIG. 8C shows further details of the electrical terminals, according to an embodiment of the invention.





DETAILED DESCRIPTION OF THE INVENTION

The present invention provides a switch for connecting, for example, paired electrical wires. As shown in FIGS. 1A, 1B and 2, an electrical contact assembly or switch 10 in accordance with an embodiment of the invention includes one or more electrical terminals 11a, 11b, a spring member 12, a contact member 13, a push button 14, a housing 16, and a cover 18.


The terminals 11a and 11b have retaining portions 11a-2 and 11b-2 that are adapted to retain electrical wires 101a and 101b (e.g., FIG. 8B). The electrical wires may be extended through apertures 18-1 and 18-2 in the assembly 10 formed by the housing 16 and the cover 18, to connect to an electrical circuit 100 (FIGS. 8A-8C). When assembled, the housing 16 and the cover 18 together substantially enclose the contact member 13 and the terminals 11a and 11b, and partially enclose the push button 14.


The contact member 13 has a first contact portion 13a and a second contact portion 13b. The second contact portion 13b as shown is at an angle in relation to the first contact portion 13a, i.e., the portion 13b is “bent” in relation to the portion 13a. The second contact portion 13b is adapted to come in contact with a surface 11a-1 of the first terminal 11a. The contact member 13 may further include a third contact portion 13c and a fourth contact portion 13d. The fourth contact portion 13d is bent in relation to portion 13c, and is adapted to come in contact with a surface 11b-1 of the second terminal 11b.


The contact member 13 is overall “U” shaped, with contact portions 13a and 13b forming a first “leg” 13-1, and contact portions 13c and 13d forming a second “leg” 13-2. The contact member 13 may also be of other shapes such as “V” shaped, etc. The contact member 13 may have more “legs” and contact portions, and may be unitarily formed using, for example, beryllium copper. Alternatively, different portions, such as the first contact portion 13a and the second contact portion 13b, may be formed separately and then coupled together.


The push button 14 has an internal extrusion 14a adapted to extend through an aperture 13f of the top portion 13e of the contact member 13, and extend through a first portion of the spring member 12 thus retaining the first portion of the spring member 12 to a substantially fixed location. For a contact member 13 having a width of about 3.15 mm at the top portion 13e, the aperture 13f has a diameter of about 1.52 mm.


The housing 16 has an aperture 16a adapted to have the push button 14 extend therethrough. As shown in FIG. 1B, the housing 16 has a guard 16b around the aperture 16a. The housing 16 has a plurality of extrusions 16c adapted to fit into corresponding indentions 18c in the cover 18 when the contact assembly 10 is assembled. The cover 18 also has an internal extrusion 18a adapted to extend through a second portion of the spring member 12 to fix the second portion of the spring member 12 into place.



FIG. 3 shows a perspective view of a partial, internal structure of the electrical contact assembly 10 showing only the terminals 11a and 11b, the spring member 12, the contact member 13, and the push button 14. In this state, the electrical contact assembly 10 is in a disconnected, or open, state since the electrically conductive contact member 13 is not in electrical contact with the terminals 11a and 11b to allow current to flow between the electrically conductive terminals 11a and 11b through the contact member 13.



FIG. 4 shows a cross sectional view of the contact assembly 10 after it is assembled. In accordance with an embodiment of the invention, the electrical terminals 11a and 11b are slanted relative to the bottom surface 18b of the cover 18. As further shown in FIG. 5, the terminals 11a and 11b are slanted slightly upwardly relative to the bottom surface 18b of the cover 18, and form an angle θ relative to the bottom surface 18b of the cover 18. The angle θ is smaller than β, i.e., 0°<θ<β, and is preferably about 10°.


As shown in FIG. 4, the contact member 13 and the terminals 11a and 11b are normally in a disconnected, or open, state (i.e., the contact assembly 10 is “normally open”). As illustrated in detail in FIG. 5, the first contact portion 13a forms a first angle α with a surface 11a-1 of the electrical terminal 11a. The first angle α may be between about 20° and 90°, and preferably about 75°.


The second contact portion 13b forms a second angle β with the surface 11a-1 of the terminal 11a. The second angle β is smaller than the first angle α, i.e., 0°<β<α, and preferably is about 25°. The first portion 13a and the second portion 13b form a relative angle γ=180°−α+β, which is preferably about 130°.


In one exemplary implementation, the second portion 13b is angled (bent) about γ=130° from the first contact portion 13a. In other words, the second portion 13b is angled (bent) about 50° vertically from the first contact portion 13a.


As shown in FIG. 6A, when the push button 14 is pressed, the contact member 13 is in turn pressed, compressing the spring member 12. The second contact portion 13b comes in contact with the surface 11a-1 of the first terminal 11a, and the fourth contact portion 13d comes in contact with the surface 11b-1 of the second terminal 11b. Electrical connection may thus be established between the terminals 11a and 11b through the contact member 13. In this state, the contact assembly 10 is connected, or closed. When wires 101a and 101b are connected to the terminals 11a and 11b as shown in FIG. 8B, the contact assembly 10 provides electrical connection between wires 101a and 101b.


The contact assembly 10 remains closed (providing electrical connection between the terminals 11a, 11b) so long as the spring member 12 remains compressed, allowing the contact member 13 to maintain electrical contact with both the terminals 11a and 11b.



FIG. 6B further illustrates the contact member 13 in its open state and in its closed state 13′. In the closed state, the spring member 12 is compressed, and contact portions such as the portion 13d′ are in electrical connections with terminals such as terminal 11b.


As illustrated in FIG. 7A, and described above, when the contact member 13 is pushed down from its first position (normally open) 22 to a second position 23, the second contact portion 13b comes in initial contact with the surface 11a-1. When the push button 14 is pressed further, the contact member 13 is pushed to a third position 33 (FIG. 7B). The second contact portion 13b may be bent outwardly further, decreasing the relative angle γ and the second angle β. Such a bending provides a resilient force on the contact member 13. This causes contact member leg 13-1 formed by the portions 13a, 13b to be pushed away from the contact member leg 13-2 formed by the portions 13c, 13d.



FIG. 7B shows the contact member 13 being pressed such that the contact portion 13b has its almost entire bottom surface in contact with the surface 11a-1 of the terminal 11a, after a tip of the contact portion 13b has slid on the surface 11a-1 for a distance d. The distance d may be comparable with the length of the second contact portion 13b, e.g., 0<d<1.5 mm. As discussed further below, such a sliding range increases the reliability of the electrical connection.


The relative angle between the contact portions 13a and 13b decreases until the angle γ′=180−α′ as shown, where the angle α′ between the contact portion 13a and the surface 11a-1 may also have decreased, depending on the flexibility between the portion 13a and the top portion 13e of the contact member 13.


As shown earlier in FIG. 1, the width of the contact member 13 may be designed to taper down from the top portion 13e toward the contact portions 13b and 13d. For a switch assembly 10 having a width of about 12 mm and a thickness of about 9 mm, for example, the contact member 13 may be tapered down from the top portion 13e at a width of about 3.15 mm to a width of about 1.6 mm at the tip of the second contact portion 13b.


The tapered width of the contact member 13 provides a softer resilient force between the contact portions 13a and 13b as compared with the resilient force between the top portion 13e and the contact portion 13a when the contact member 13 is compressed. Thus, it is easier to bend the second contact portion 13b from the first contact portion 13a as compared with bending the first contact portion 13a from the top contact portion 13e. As illustrated in FIG. 7B, the first contact portion 13a may be bent from the top portion 13e for an angle δ, e.g., about 0°<δ<30°. Preferably δ is limited to be less than about 26.2° to avoid damages to the contact member 13. This can be achieved, for example, by stop ribs 11a-3 and 11b-3 on the terminals 11a and 11b, respectively, or by the range of the top portion 13e can travel. The change in the angle γ, i.e., γ−γ′, is larger than δ because of the less resilient force between the portions 13a and 13b as compared with that between the first portion 13a and the top portion 13e.


As shown in FIG. 7C, according to another embodiment of the invention, the connection 13e-1 between the top portion 13e and the first portion 13a is so rigid that δ=0 even after the tip of the second contact portion 13b has slid for a distance d on the terminal 11a when the contact member 13 is pressed to a position 35. Those of ordinary skill in the art will recognize that other variations of the contact member 13 are possible. For example, the contact portions 13a and 13c may not be parallel even in an “open” state. Rather, an angle may exist between the portions 13a and 13c. Further, the top portion 13e may be smaller than shown, or may be so small that the contact member 13 is essentially “V” shaped instead of “U” shaped. In this case, a resilient force may be provided directly between the portions 13a and 13c. Moreover, contact portions 13b and 13d may not be necessary, and the tips of portions 13a and 13c may directly slide on the terminals 11a and 11b.



FIG. 7D shows yet another embodiment of the contact member 13. As shown, the first contact portion 13a comprises two portions 13a-1 and 13a-2, and the deflection or bending of the contact member 13 may occur between these two portions 13a-1 and 13a-2 in addition to between the second contact portion 13b and the first contact portion 13a. The second contact portion 13b as shown is in essentially complete contact with the terminal 11a. When the contact member 13 is pressed further, a further deflection may occur between these two portions 13a-1 and 13a-2 in addition to, or alternative to, the deflection between the first contact portion 13a and the top contact portion 13e. As shown δ increases from about 0° to about 13.1°, while the angle γ′ reaches about 118.1°. The tip of the second contact portion 13b slides for a distance d of about 0.40 mm before being stopped by the rib 11a-3.


The resilient force causes an outwardly sliding tendency of the second portion 13b on the surface 11a-1. When the sliding tendency overcomes the friction between the second portion 13b and the surface 11a-1, at least a tip of the second contact portion 13b slides outwardly on the surface 11a-1, in the direction shown as a block arrow 71 in FIG. 7A. The sliding tip of the second contact portion 13b cleans a portion of the surface 11a-1 to remove, for example, oxidation layers, dust, and other contaminations that may cause a bad electrical contact. This is a self-cleaning action that allows proper electrical contact between the terminal surfaces 11a-1, 11b-1 and the contact portions 13a, 13d, respectively.


Even after repetitive open and close state cycles of the contact 20 assembly (switch 10) such that wearing on the contact portions 13b, 13d and the surfaces 11a-1 and 11b-1 may occur, proper electrical contact may still be ensured as a result of the range of relative positions (between position 23 and position 33) the contact member 13 can move while trying to make electrical contact with terminals 11a and 11b. Thus, the contact assembly 10 of the invention provides a reliable electrical connection through the “self cleaning” function and the range of contact positions.


As noted, when the push button 14 is pressed, the spring member 12 is compressed. When the push button 14 is partially released, the second portion 13b slides back on the surface 11a-1 of the terminal 11a as a result of the resilient force between the contact member 13 and the surface 11a-1. When the push button 14 is further released, the contact member is moved by the spring member 12 passing the second position 23, and the second portion 13b breaks electrical contact with the surface 11a-1.


In another embodiment of the present invention, the push button 14 may be locked into one or more lock positions using mechanisms known in the art.



FIG. 8A shows a portion of an electrical system 100 including a plurality of contact assemblies 10a, 10b, and 10c according to an embodiment of the present invention. Each of the contact assemblies 10a, 10b, and 10c is similar to the contact assembly 10 (e.g., FIGS. 1A-2) described above.


As shown in FIG. 8A, contact assembly 10a acts as a single termination for electrical wires 101a and 101b, while contact assembly 10b acts as a double termination for wires 101a, 101b, 101c and 101d. A conventional switch 80 may also be included in the circuitry. FIG. 8B shows the electrical system 100 with the contact assemblies partially removed, exposing the electrical terminals such as 11a and 11b. FIG. 8C shows further details of an electrical terminal 81. The retaining portion 81-1 of the terminal 81 retains two wires 83 and 85. Thus terminal 81 can be used to as a splitting point for wires 83 and 85.


Advantageously, the invention provides a reliable and durable electrical switch. The switch has a “self-cleaning” function that helps maintain a reliable electrical connection.


The present invention has been described in considerable detail with reference to certain preferred versions thereof; however, other versions are possible.


For example, those of ordinary skill in the art will recognize that many design variations of the contact member 13 may exist without departing the scope of the invention. The contact member 13 may have more “legs,” and each leg may include more than two portions having different relative angles with respect to the corresponding electrical terminal. The dimensions and the materials of the portions may vary.


In addition, the different portions may be made separately and then coupled together. Moreover, although the contact member 13 as shown has two, symmetrical legs each having two portions, the legs may be configured asymmetrically. Moreover, although the contact member as shown in the drawings is “bent” outwardly, it is possible that it can be designed to be bent inwardly; so long the terminals are slanted inwardly accordingly.


Therefore, the spirit and scope of the appended claims should not be limited to the description of the preferred versions contained herein.

Claims
  • 1. An electrical contact assembly, comprising: a slanted electrical terminal;a push button; anda contact member disposed between the electrical terminal and the push button, the contact member comprising: a first portion forming a first angle in relation to a surface of the electrical terminal; anda second portion, connected to the first portion, and forming a second angle in relation to the surface of the electrical terminal,wherein the second angle is unequal to the first angle,such that the second portion is adapted to make contact with, and slide on the surface of the electrical terminal as the push button is pushed against the contact member,wherein the second portion is substantially parallel to the electrical terminal when in contact.
  • 2. The electrical contact assembly of claim 1, further comprising a spring member coupled with a portion of the push button and a bottom portion of a cover to normally maintain the contact member away from the electrical terminal.
  • 3. The electrical contact assembly of claim 1, further comprising a housing and a cover together substantially enclosing the electrical terminal and the contact member.
  • 4. The electrical contact assembly of claim 1, further comprising a retainer adapted for retaining an electrical wire, wherein the retainer is in electrical contact with the electrical terminal.
  • 5. The electrical contact assembly of claim 1, wherein: the electrical terminal has an essentially planar surface, the first portion of the contact member is transverse in relation to said surface of the electrical terminal and the second portion is transverse in relation to said surface of the electrical terminal, such that the second angle is less than the first angle.
  • 6. The electrical contact assembly of claim 1, wherein the contact member comprises beryllium copper.
  • 7. The electrical contact assembly of claim 1, wherein the second portion is adapted to wipe a portion of the surface of the electrical terminal when sliding on said surface.
  • 8. The electrical contact assembly of claim 1, wherein the contact member further comprises: a third portion and a fourth portion symmetrical in configuration to the first portion and the second portion, respectively; anda top portion connecting the first and the third portions, forming an essentially U-shaped contact member.
  • 9. The electrical contact assembly of claim 1, further comprising a spring member coupled to the contact member and to the push button, wherein an opening is defined in the top portion of the contact member to axially receive an extrusion of the push button therethrough extending through a portion of the spring member as the push button is urged against the contact member.
  • 10. The electrical contact assembly of claim 1, wherein the contact member is adapted to provide a resistive mechanical force between the push button and the electrical terminal when in electrical contact with the electrical terminal, the resistive force at least partially resulting from a change in a relative angle between the first portion and the second portion as the push button is urged against the contact member.
  • 11. The electrical contact assembly of claim 10, wherein the relative angle between the first portion and the second portion is about 130° when the contact member is not in electrical contact with the electrical terminal.
  • 12. The electrical contact assembly of claim 1, wherein the first angle is between about 20° and 90°.
  • 13. The electrical contact assembly of claim 12, wherein the first angle is about 75°.
  • 14. The electrical contact assembly of claim 12, wherein the second angle is about 25°.
  • 15. An apparatus, comprising: a plurality of slanted electrical terminals;a switch for making an electrical connection between at least two of the plurality of electrical terminals, wherein the switch comprises:a push button; andan essentially U-shaped contact member disposed between the electrical terminals and the push button, and adapted to provide an electrical connection between a first terminal and a second terminal when the push button is urged against the contact member to bring the contact member in electrical contact with the first and second electrical terminals to electrically close the switch, the contact member comprising: a first element forming a first transverse angle in relation to a surface of the first electrical terminal; anda second element forming a second transverse angle in relation to a surface of the second electrical terminal;such that at least a portion of the first element is adapted to make contact with and slide on the surface of the first electrical terminal as the push button is urged against the contact member, and at least a portion of the second element is adapted to make contact with and slide on the surface of the second electrical terminal as the push button is urged against the contact member,
  • 16. The apparatus of claim 15, wherein the contact member is adapted to reversibly deform as the push button is urged against the contact member, to allow a change in the first angle that enables a tip portion of the first element to slide on the surface of the first electrical terminal, and to allow a change in the second angle that enables a tip portion of the second element to slide on the surface of the second electrical terminal.
  • 17. The apparatus of claim 16, wherein: the contact member further comprises a top element connecting the first and second elements;the first element includes a mid portion connecting the tip portion of the first element to the top element, the mid portion of the first element forming a third transverse angle in relation to the tip portion of the first element, the second element includes a mid portion connecting the tip portion of the second element to the top element, the mid portion of the second element forming a fourth transverse angle in relation to the tip portion of the second element.
  • 18. The apparatus of claim 17, further comprising a spring member disposed between at least a portion of the contact member and the terminals to normally maintain the contact member away from the electrical terminals to electrically open the switch.
  • 19. The apparatus of claim 18, wherein the spring member provides a counter force to disconnect the contact member from the first and second electrical terminals when the push button is not urged against the contact member, thereby transitioning the switch from electrically closed to electrically open.
  • 20. The apparatus of claim 19 further comprising a housing and a cover together substantially enclosing the electrical terminals and the contact member, the housing forming an opening that slidably retains at least a portion of the push button, such that a top portion of the push button is exposed outside the housing to allow urging the push button against the contact member to electrically close the switch.
  • 21. An electrical system, comprising: a plurality of electrical terminals; anda switch for making an electrical connection between at least two of the plurality of electrical terminals, wherein the switch comprises:a push button; anda contact member disposed between the electrical terminals and the push button, and adapted to provide an electrical connection between a first terminal and a second terminal when the push button is urged against the contact member to bring the contact member in electrical contact with the first and second electrical terminals, the contact member comprising: a first element forming a first transverse angle in relation to a surface of the first electrical terminal;a second element, connected to the first element, and forming a second transverse angle in relation to the surface of the first electrical terminal; anda third element connected to the first element;such that the second element is adapted to make contact with, and slide on the surface of the first electrical terminal as the push button is urged against the contact member, andthe third element is adapted to make contact with the second electrical terminal as the push button is urged against the contact member, whereby the contact member provides an electrical connection between the first and second electrical terminals,wherein all of a flat surface of the second element is coupled with the first electrical terminal when the push button is depressed.
  • 22. The electrical system of claim 21, wherein the second element is adapted to wipe a portion of the surface of the first electrical terminal when sliding on the surface.
  • 23. The electrical system of claim 21, wherein the contact member is adapted to provide a resistive mechanical force against the push button when in electrical contact with the first electrical terminal and the second electrical terminal, the resistive force resulting from a change in a relative angle between the first element and the second element.
  • 24. The electrical system of claim 21, wherein the switch further comprises a spring member disposed between a portion of the contact member and terminals, for providing a counter spring force to disconnect the contact member from the first electrical terminal and the second electrical terminal when the push button is not urged against the contact member.
  • 25. The electrical system of claim 21, further comprising a spring member to normally maintain the contact member away from the electrical terminals.
US Referenced Citations (150)
Number Name Date Kind
2355459 Miskella Aug 1944 A
2422097 Hansen Jun 1947 A
2478564 Bordelon Aug 1949 A
2966561 Durrant Dec 1960 A
3012219 Levin et al. Dec 1961 A
3204067 Brown Aug 1965 A
3226991 Hartsock Jan 1966 A
3329784 Rogero Jul 1967 A
3445796 Spiroch et al. May 1969 A
3454733 Sanford et al. Jul 1969 A
3463491 Shaw Aug 1969 A
3472721 Abramson et al. Oct 1969 A
3509317 Valsamakis et al. Apr 1970 A
3510069 Hannum May 1970 A
3523168 Holmes Aug 1970 A
3535478 Lewis Oct 1970 A
3588425 Erickson Jun 1971 A
3591747 Dennison Jul 1971 A
3592992 Costello Jul 1971 A
3598948 Bowen et al. Aug 1971 A
3600553 Costello Aug 1971 A
3649811 Schoenthaler Mar 1972 A
3657508 Studnick Apr 1972 A
3668579 Harman Jun 1972 A
3674974 Costello Jul 1972 A
3674975 Nugent et al. Jul 1972 A
3694603 Congelliere et al. Sep 1972 A
3744557 Costello Jul 1973 A
3760312 Shlesinger, Jr. Sep 1973 A
3763348 Costello Oct 1973 A
3788560 Hough et al. Jan 1974 A
3790912 Murphy Feb 1974 A
3801753 Szymber Apr 1974 A
3809838 Coppola May 1974 A
3899236 Santos Aug 1975 A
3910672 Frantz Oct 1975 A
3931487 Russenberger Jan 1976 A
3974469 Nicholls Aug 1976 A
3993885 Kominami et al. Nov 1976 A
4006322 Gallatin et al. Feb 1977 A
4019801 Hoffman Apr 1977 A
4041427 Chusha Aug 1977 A
4052580 Stanish Oct 1977 A
4055736 Congelliere Oct 1977 A
4062626 Kawakami et al. Dec 1977 A
4089047 Luderitz May 1978 A
4152755 Trosper et al. May 1979 A
4169974 Peers-Trevarton Oct 1979 A
4175222 Buttner Nov 1979 A
4203017 Lee May 1980 A
4241244 Swann Dec 1980 A
4252395 Ward et al. Feb 1981 A
4308440 Buttner Dec 1981 A
4317015 Buttner et al. Feb 1982 A
4319106 Armitage Mar 1982 A
4335287 Aschenbach et al. Jun 1982 A
4345128 Buttner et al. Aug 1982 A
4413872 Rudy et al. Nov 1983 A
4419169 Becker et al. Dec 1983 A
4419304 Ficke et al. Dec 1983 A
4460820 Matsumoto et al. Jul 1984 A
4461528 Durand et al. Jul 1984 A
4476359 Bienwald Oct 1984 A
4496803 Smith Jan 1985 A
4506124 Rose et al. Mar 1985 A
4524253 Sorenson Jun 1985 A
4529258 Anthony Jul 1985 A
4541679 Fiedler et al. Sep 1985 A
4575590 Hattori et al. Mar 1986 A
4605839 Rasmussen et al. Aug 1986 A
4660919 Levy Apr 1987 A
4691086 Habecker et al. Sep 1987 A
4692573 Fukuyama et al. Sep 1987 A
4713498 Ludwig et al. Dec 1987 A
4754104 Maltais et al. Jun 1988 A
4771141 Flumignan et al. Sep 1988 A
4788403 Hayakawa et al. Nov 1988 A
4795860 Kamada et al. Jan 1989 A
4812620 Hayakawa et al. Mar 1989 A
4858090 Downs Aug 1989 A
4885443 Simcoe et al. Dec 1989 A
4891018 Afflerbaugh et al. Jan 1990 A
4891476 Nation et al. Jan 1990 A
4906808 Burgess et al. Mar 1990 A
4939328 Smith Jul 1990 A
4978823 Sato et al. Dec 1990 A
5001316 Salaman Mar 1991 A
5043546 Krause Aug 1991 A
5049709 Prickett et al. Sep 1991 A
5060289 Abramson Oct 1991 A
5063276 Woodard Nov 1991 A
5132499 Valenzona et al. Jul 1992 A
5145059 Park Sep 1992 A
5158172 Roeser et al. Oct 1992 A
5178265 Sepke Jan 1993 A
5186316 Mortun et al. Feb 1993 A
5194703 Deeg Mar 1993 A
5201408 Torma et al. Apr 1993 A
5226529 Valenzona Jul 1993 A
5268542 Voll Dec 1993 A
5285037 Baranski et al. Feb 1994 A
5293507 Hayakawa Mar 1994 A
5435747 Franckx et al. Jul 1995 A
5442150 Ipcinski Aug 1995 A
5493089 Chasen et al. Feb 1996 A
5514006 Getselis et al. May 1996 A
5541376 Ladtkow et al. Jul 1996 A
5586645 Bartok Dec 1996 A
5620086 Bianca et al. Apr 1997 A
5629659 Steiner May 1997 A
5636729 Wiciel Jun 1997 A
5675890 Yamamoto et al. Oct 1997 A
5681182 Reichle Oct 1997 A
5762707 Shindo Jun 1998 A
5777282 Ishiguro et al. Jul 1998 A
5785548 Capper et al. Jul 1998 A
5847345 Harrison Dec 1998 A
5871374 Maney Feb 1999 A
5924557 Pollock Jul 1999 A
5954534 Hale et al. Sep 1999 A
5961341 Knowles et al. Oct 1999 A
5964615 Endres Oct 1999 A
5994654 Benson Nov 1999 A
5999072 Slavik Dec 1999 A
6016020 Cline et al. Jan 2000 A
6080006 Broder Jun 2000 A
6093048 Arnett et al. Jul 2000 A
6106761 Sjoberg et al. Aug 2000 A
6180905 Pollock et al. Jan 2001 B1
6191376 Bartok Feb 2001 B1
6196861 Saligny Mar 2001 B1
6231373 Daoud May 2001 B1
6236006 Wecke May 2001 B1
6254421 Denovich et al. Jul 2001 B1
6264495 Robertson et al. Jul 2001 B1
6312282 Blaha et al. Nov 2001 B1
6406324 Duesterhoeft et al. Jun 2002 B1
6426486 Bartok Jul 2002 B1
6537101 Wang Mar 2003 B1
6635838 Kornelson Oct 2003 B1
6636135 Vetter Oct 2003 B1
6682363 Chang Jan 2004 B1
6729016 Wieger et al. May 2004 B2
6737596 Hein May 2004 B1
6864454 Shimizu et al. Mar 2005 B2
6974918 Blossfeld Dec 2005 B2
7090529 Wang Aug 2006 B1
7256671 Preaux Aug 2007 B1
20020106929 Nagai Aug 2002 A1
20040163940 Ravnkilde et al. Aug 2004 A1
Foreign Referenced Citations (3)
Number Date Country
1362299 Sep 1964 FR
09-257374 Oct 1977 JP
WO 9710936 Mar 1997 WO