Shaving system

Information

  • Patent Grant
  • 6594904
  • Patent Number
    6,594,904
  • Date Filed
    Tuesday, June 20, 1995
    29 years ago
  • Date Issued
    Tuesday, July 22, 2003
    21 years ago
Abstract
A shaving unit that comprises at least one blade and a skin engaging member that has a surface for engaging the user's skin adjacent the blade edge is described herein. The shaving unit may be of a disposable cartridge type adapted for coupling to and uncoupling from a razor handle or may be integral with a handle so that the complete razor is discarded as a unit when the blade or blades become dulled. The blade edge (or edges) cooperate with skin engaging surfaces to define a shaving geometry. The skin engaging member is comprised of an elongated sheath (or skin engaging layer) made of a mixture of water insoluble matrix and an effective amount of shaving aid and a rigid core (or non-skin engaging layer) extending axially through out said sheath. The axial position of the core need not be through the central axis.
Description




BACKGROUND OF THE INVENTION




1. Field of the Invention




This invention relates to an improved skin engaging member for use in razor blade cartridge assemblies and shaving systems of the wet shave type. The present invention resides broadly in providing the skin engaging cap and/or guard surfaces with configurations which reduce frictional drag of the razor across the skin. This invention also relates to a novel method of manufacturing the skin engaging member of the present invention.




2. Description of the Prior Art




In shaving systems of the wet shave type, factors such as the frictional drag of the razor across the skin, the force needed to sever hairs, and irritation of pre-existing skin damage can create a degree of shaving discomfort. Discomfort, and other problems accompanying wet shaving systems, can be alleviated by the application of shaving aids to the skin. Shaving aids may be applied prior to, during, or after shaving. A number of problems accompany the use of pre- and post-applied shaving aids. Pre-applied-shaving aids can evaporate or can be carried away from the site of application by repeated strokes of the razor. Post-applied-shaving aids are not present on the skin during shaving and thus their application may be too late to prevent an unwanted affect. Both pre-applied and post-applied shaving aids add additional steps to the shaving process.




Proposals have been made to incorporate a shaving aid e.g., lubricant, whisker softener, razor cleanser, medicinal agent, cosmetic agent or combination thereof, into a razor, e.g., by depositing a shaving aid in a recess on the razor, by incorporating a shaving aid directly into one or more molded polymeric components of the razor, by adhesively securing a shaving aid composite to the razor, and by use of a mechanical connection between a shaving aid composite and the razor. A water-soluble shaving aid, e.g. polyethylene oxide, has been mixed with non-water-soluble material, e.g., a polystyrene polymer, to form an insoluble polymer/soluble shaving aid composite. The composite has been mounted on razor and shaving cartridge structures, adjacent the shaving edge or edges, of single or multiple blade shaving systems. Upon exposure to water, the water-soluble shaving aid leaches from the composite onto the skin.




Extruded composites with relatively large amounts of shaving agent material (up to 80% by weight) and relatively low amounts of water insoluble matrix material (as little as 20% by weight) are relatively weak and have a tendency towards mechanical failure, both in assembly and in use. Increase in mechanical strength can be obtained with increased amounts of the matrix material. However, such increase reduces the releasability of the shaving agent material.




SUMMARY OF THE INVENTION




In accordance with one aspect of the invention, there is provided a shaving unit that comprises at least one blade and a skin engaging member that has a surface for engaging the user's skin adjacent the blade edge. The shaving unit may be of a disposable cartridge type adapted for coupling to and uncoupling from a razor handle or may be integral with a handle so that the complete razor is discarded as a unit when the blade or blades become dulled. The blade edge (or edges) cooperate with skin engaging surfaces to defines a shaving geometry. The skin engaging member is comprised of an elongated sheath (or skin engaging layer) made of a mixture of water insoluble matrix and an effective amount of shaving aid and a rigid core (or non-skin engaging layer) extending axially through out the sheath. The axial position of the core need not be through the central axis.




An object of the present invention is to provide a skin engaging member with improved mechanical strength.




Another object of the present invention is to provide a skin engaging member with improved shaving aid release characteristics.




Yet another object of the present invention is to provide a wear indicating skin engaging member.




These and other objects should be evident from the following:











BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is a perspective view of a razor unit in accordance with the invention;





FIG. 2

is a sectional view taken along the line


2





2


of

FIG. 1

;





FIG. 3

is a sectional view of another razor unit in accordance with the invention;





FIG. 4

is an enlarged perspective view of a skin engaging member of the present invention;





FIG. 5

is sectional view taken along the line


3





3


of

FIG. 4

;





FIGS. 6-7

are sectional views in accordance with

FIG. 5

wherein alternate core geometries are depicted;





FIG. 8

is a cross-sectional view of the skin engaging member of

FIG. 1

; and





FIG. 9

is a schematic cross-section diagram of an extrusion die suitable for manufacturing the skin engaging member of FIG.


4


.











DESCRIPTION OF PARTICULAR EMBODIMENTS




The shaving unit (or razor cartridge)


10


shown in

FIGS. 1 and 2

includes a frame formed by a base or platform member


12


and a cap member


30


, wherein the base or platform member


12


is molded of high impact polystyrene and includes integral coupling groove structure


14


for attachment to a razor handle and guard structure


16


that defines a transversely extending forward skin engaging surface


18


. On the upper surface of platform


12


are disposed steel leading blade


20


having a sharpened edge


22


, steel following blade


24


having sharpened edge


26


, and aluminum spacer member


28


that maintains blades


20


and


24


in spaced relation. Cap member


30


is molded of high impact polystyrene and has body portion


32


that defines skin engaging surface


34


that extends transversely between forwardly projecting end walls


36


and has a front edge


38


that is disposed rearwardly of blade edge


26


. Integral rivet portions


40


extend downwardly from transversely extending body portion


32


and pass through holes in blades


20


and


24


, spacer


28


, and platform


12


to secure cap


30


, blades


20


,


24


and spacer


28


on platform


12


. Adhesively affixed to skin engaging surface


34


is skin engaging member


42


.




The shaving unit (or razor cartridge)


50


shown in

FIG. 3

is of the type shown in Jacobson U.S. Pat. No. 4,586,255 and includes body or frame


52


with front portion


54


and rear portion


56


. Resiliently secured in body


52


are guard member


58


, leading blade unit


60


and trailing blade unit


62


. A shaving aid composite in the form of elongated skin engaging member


64


is frictionally locked in opening


66


of rear portion


56


.





FIGS. 4-9

generally depict variations on the present invention. As used herein, the term “core” refers to an internal portion of a skin engaging member as examined at the cross-section. The core typically runs throughout the skin engaging member along an axis. The axis need not be the central axis. The FIGS. designate the core as


70


. Embodiments of the present invention have at least one core element. As used herein, the term “sheath” refers to an outer coating layer(s) over the core. The FIGS. designate the sheath as


72


.




Referring now to the drawings, and in particular to

FIG. 4

, there is shown an elongated skin engaging member


64


. The member


64


has a skin engaging surface


74


and an elongated insert member


76


. The insert member


76


is designed to frictionally lock in an opening


66


as shown in FIG.


3


. The skin engaging member further comprises a rigid core


70


which is surrounded by a sheath


72


made of a mixture of water insoluble matrix and an effective amount of a shaving aid.




The sheath includes from about 0% to about 30% by weight, preferably from about 5% to about 15% of the water insoluble matrix and from about 70% to about 100% by weight of the water soluble shaving aid preferably from about 85% to about 95% shaving aid. Suitable water insoluble polymers for the matrix include, for example, nylon, ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polystyrene, polyacetol and combinations. Suitable shaving aids include, for example, polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazoline, polyethylene glycol, polyvinyl alcohol, methylcellulose, starch, water soluble vinyl polymers (Carbopol® brand sold by B.F. Goodrich), polyhydroxyethylmethacrylate, silicone copolymers, sucrose stearate, vitamin E, panthenol, aloe, essential oils such as menthol and combinations. The examples illustrate sheaths comprising from 65% to 82% polyethylene oxide.




The sheath may include additional components such as: plastisizers, such as polyethylene glycol; beard softeners, such as Kraton G 13 A; additional lubricants, such as silicone oil, Teflon® polytetrafluoroethylene powders (manufactured by DuPont), and waxes; shaving aids, such as menthol, eugenol, eucalyptol, safrol and methyl salicylate; fillers, such as calcium carbonate, mica and fibers; tackifiers such as Hercules Regalrez 1094 and 1126; fragrances; antipruritic/counterirritant materials such as Frescolat; antimicrobial/keratolytic materials such as Resorcinol; anti-inflammatory agents such as Candilla wax and glycyrrhetinic acid; astringents such as zinc sulfate; surfactants such as pluronic and iconol materials; comptibilizers such as styrene-b-EO copolymers; and, blowing agents such as Uniroyal Celogen Aznp 130. These additives may leach from the surface to provide improved shaving. These components could be dispersed throughout the sheath or alternatively, a second, outer sheath containing the additional element could be extruded or merely coated over the primary sheath.




The present skin engaging member is produced by a coextrusion process whereby a rigid core displaces a portion of the sheath. The nature and relative portions of the sheath and core polymeric materials are such that the skin engaging member has adequate mechanical strength, both as initially produced and after a significant amount of water soluble material has been leached out, the quantity of the water-soluble material being sufficient to provide effective shaving assistance, such as lubrication, for the entire expected life of the blade or blades. The function of the core is not only to provide additional rigidity but to displace trapped shaving aid. In conventional skin engaging members, such as those described in U.S. Pat. Nos. 5,063,667; 5,095,619; and 5,113,585, a significant amount of shaving aid is trapped within the insoluble matrix. By displacing it closer to the skin engaging surface


74


, diffusional paths are reduced and more efficient delivery is achieved. Furthermore, the core provides additional mechanical strength for the attaching mechanism, if used.




The core must have sufficient mechanical strength and rigidity to provide adequate mechanical strength to the entire skin engaging member, both as initially produced and after a significant amount of water soluble material has been leached out of the sheath. Preferably, the core can be made from a water soluble polymer or a blend consisting of at least about 50% of water insoluble polymer to prevent the core from disintegrating. Water-soluble polymers for use in such blends include polyethylene oxide, polyvinyl pyrrolidone; polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazoline, polyethylene glycol, polyvinyl alcohol, methylcellulose starch water-soluble vinyl polymers (Carbopol® brand sold by B.F. Goodrich), polyhydroxyethylmethacrylate, and combinations thereof. Suitable water insoluble polymers for use in the core include polystyrene, high impact polystyrene, polypropylene, filled polypropylene, nylon, and blends thereof such as 70% nylon/30% polyethylene oxide, 60% polystyrene/40% polyethylene oxide.




Optionally, the core can include additives such as lubricants foaming agents, microspheres, baby powders, fillers such as CaCO


3


, colorants such as TiO


2


silicone copolymers, sucrose stearate, vitamin E, panthenol, aloe, essential oils, e.g. menthol, and combinations thereof.




In an embodiment of the present invention a wear indicating effect is produced when the sheath and the core are made of disparately colored materials (e.g. white colored sheath and blue colored core). Upon use, the sheath at the skin engaging surface is typically worn off (or eroded) through use. With sufficient use, a second colored region represented by the core is exposed, thus, providing the user with an indication that the shaving unit and/or skin engaging surface have reached their effective life. In a preferred embodiment, the sheath consists of a polyethylene oxide/polystyrene mixture which is white in color and the core consists of nylon and/or styrene which has been colored with a FD&C Blue No. 2 dye. Other suitable dyes or pigments include FD&C Red No. 40, Erythrosine (FD&C Red No. 3), Brilliant Blue FCF (FD&C Blue No. 1), Indigotine (FD&C Blue No. 2), Tartrazine (FD&C Yellow No. 5), Sunset Yellow FCF (FD&C Yellow No. 6) and Fast Green FCF (FD&C Green No. 3) and Titanium Dioxide.





FIG. 5

depicts a cross section of an alternate skin engaging member. The core


70


follows the general contours of the surface defined by the outside of the sheath.

FIG. 6

depicts a slight variation on that theme where a thicker sheath layer is provided along the skin engaging surface


74


. Still further,

FIG. 7

provides a cross-section wherein a very high degree of sheath material is present along the skin engaging surface.




Finally,

FIG. 8

depicts the skin engaging member depicted in

FIGS. 1 and 2

. It is interesting to note that the core in this case provides mechanical strength to the unit yet is not vital to the mechanical locking of the unit. The skin engaging member of

FIGS. 1 and 2

is affixed by adhesive. According to the present invention, the skin engaging members may be affixed by adhesive such as Loctite Super Bonder 499, mechanical locking mechanism, thermal welds.





FIG. 9

is a schematic cross section diagram of an extrusion die suitable for manufacturing the skin engaging member of the present invention. Core material


80


is fed into the intrusion die


51


by an extrusion screw, hot melt or other suitable means. In the core inlet port


82


the tight core orifice


83


encounters the sheath material


86


, which has been fed into sheath inlet port


84


, wherein the core becomes encapsulated by the sheath material when viewed in a transverse cross section to the flow of the die material. The encapsulated core then proceeds to the die outlet


85


wherein the continuous skin engaging members can be cured and/or drawn down to provide the appropriate dimensions. Also, it should be noted that the core material could consist of a solid wire or solid plastic material which is fed in through a conventional die to produce an encapsulated skin engaging member. For general discussion of coextrusion technology see Levy,


Plastics Extrusion Technology Handbook,


Industrial Press Inc., pages 168-188 (1981), incorporated herein by reference. After the continuous skin engaging members are produced, the strand is sent for further processing where it is typically drawn down to the correct size and cut to length suitable for implant into the body of a razor blade cartridge. This cutting can be achieved by knife edge cutting, lasers or water lasers. The skin engaging surfaces of the present invention typically are rectangular in shape with a width of from about 0.05 inches to about 0.1 inches and a length of about 1.2 inches.




Applicant considers equivalent embodiments to be part of the present invention. For example, non-rectangular skin engaging surface areas may be utilized (such as ovals) and non-flat surface patterns could be utilized. These and other equivalent embodiments are also contemplated by the present invention. The present invention and the manner of making and using the same should be evident from the following examples:




EXAMPLES




The following samples were coextruded with a cross-section as in FIG.


5


.

















No.




Core Composition




Sheath Composition

























1




Nylon 70%




10% polystyrene







blue pigment 0.5%




76% polyethylene oxide







polyethylene oxide 29.5%




8% polyvinyl acetate








5% polyethylene glycol








1% white pigment






2




25% polyethylene oxide




78% polyethylene oxide







75% nylon




14% polystyrene








3% polyethylene glycol








5% polyvinyl alcohol






3




100% polystyrene




82% polyethylene oxide








14% polystyrene








3% polyethylene glycol








1% polyvinyl alcohol






4




70% nylon




80% polyethylene oxide







29.5% polyethylene oxide




16% polystyrene







0.5% blue dye




4% polyvinyl alcohol






5




98% polystyrene




73% polyethylene oxide







2% blue dye




5% Salsorb








5% polyvinyl alcohol






6




100% polystyrene




74% polyethylene oxide








10% polystyrene








10% polyvinyl alcohol








5% polyethylene glycol








1% white TiO2 pigment






7




98% polystyrene




68% polyethylene oxide







2% blue dye




15% polyvinyl alcohol








10% polystyrene








5% polyethylene glycol








2% white TiO2 pigment






8




100% polystyrene




67% polyethylene oxide








4% Salsorb








14% polyvinyl alcohol








10% polystyrene








4% polyethylene glycol








1% white TiO2 pigment






9




99% polystyrene




68% polyethylene oxide







1% blue dye




20% polyvinyl alcohol








10% polystyrene








2% white TiO2 pigment






10




99% polystyrene




70% polyethylene oxide







1% blue dye




13% polyvinyl alcohol








15% polystyrene








2% white TiO2 pigment






11




99% polystyrene




65% polyethylene oxide







1% blue dye




15% polyvinyl alcohol








15% polystyrene








3% Salsorb








2% white TiO2 pigment






12




99% polystyrene




65% polyethylene oxide







1% blue dye




10% polyvinyl alcohol








15% polystyrene








3% Salsorb








2% white TiO2 pigment














Example 13




The following procedure can be used to produce a skin engaging member of the type depicted in FIG.


4


.




The extrusion equipment includes two single-screw extruders, a die cross-head, a cooling channel, and a puller. The strip extruded from the extruders is pulled through a cooling tunnel by a Farris puller (a take-off machine) at a speed of approximately 10 feet per minute with minimum tension on the strip. The strip is air-cooled by blowing dry compressed air into the tunnel at approximately 10 CFM. The extrudate is kept in a cool, dry room.




The core blend (70% Zytel 330 brand amorphous nylon/blue pigment, 30% polyethylene oxide blend 60/40 is extruded through the first ¾″ Haake extruder (barrel pressure of 4,343 psi and temperature of 180° C.). The sheath blend (80% polyethylene oxide/blend 60/40, 14% polystyrene/white color, 3% PEG, and 3% PVA 2025) is extruded through the second ¾″ Haake extruder (barrel pressure of 6,131 psi and temperature of 180° C.). The two materials are then joined and are fed through a cross-head at a temperature of 180° C., die temperature of 180° C., and die pressure of 3,600 psi to form a continuous lubricating strip. The line speed is approximately 10 FPM.



Claims
  • 1. A razor cartridge comprising a blade mounted in a frame, and an immovable skin engaging member affixed adjacent said blade, at least a portion of said skin engaging member extending outwardly from said frame and located such that it contacts the skin of a user during shaving, said skin engaging member comprising, prior to assembly into said cartridge and prior to use during shaving, two adjoining disparately colored, solid polymeric layers, said layers comprising an erodible skin engaging layer of a first color overlying a non-skin engaging layer of a different color, said skin engaging layer comprising a blend of a water soluble shaving aid and a water insoluble polymer, said water soluble shaving aid being water-leachable from said skin engaging layer, and said non-skin engaging layer comprising a water insoluble polymer, wherein said skin engaging layer is adapted to erode during contact with said skin during shaving to visually expose said non-skin engaging layer.
  • 2. A razor cartridge comprising a blade mounted in a frame, and an immovable skin engaging member affixed adjacent said blade, at least a portion of said skin engaging member extending outwardly from said frame and located such that it contacts the skin of a user during shaving, said skin engaging member comprising, prior to assembly into said cartridge and prior to use during shaving, two adjoining disparately colored, solid polymeric layers, said layers comprising an erodible skin engaging layer of a first color overlying a non-skin engaging layer of a different color, said skin engaging layer comprising a blend of polyethylene oxide and a water insoluble polymer, said polyethylene oxide being water-leachable from said skin engaging layer, and said non-skin engaging layer comprising a water insoluble polymer, wherein said skin engaging member is constructed such that said skin engaging layer erodes during contact with said skin during shaving to visually expose said non-skin engaging layer.
  • 3. A razor cartridge comprising a blade mounted in a frame, and an immovable skin engaging member affixed adjacent said blade, at least a portion of said skin engaging member extending outwardly from said frame and located such that it contacts the skin of a user during shaving, said skin engaging member comprising, prior to assembly into said cartridge and prior to use during shaving, two adjoining disparately colored, solid polymeric layers, said layers comprising an erodible skin engaging layer of a first color overlying a non-skin engaging layer of a different color, said skin engaging layer comprising a blend of polyethylene oxide and a water insoluble polymer, said polyethylene oxide being water-leachable from said skin engaging layer, and said non-skin engaging layer comprising a water insoluble polymer, wherein said skin engaging layer is adapted to erode during contact with said skin during shaving to visually expose said non-skin engaging layer.
  • 4. The razor cartridge of claim 1, 2 or 3 wherein said skin engaging layer comprises 65% to 82% by weight polyethylene oxide.
  • 5. The razor cartridge of claim 4 wherein said water insoluble polymer in said skin engaging layer comprises a polymer selected from the group consisting of nylon, ethylene vinyl acetate, polyethylene, polypropylene, polystyrene and polyacetal.
  • 6. The razor cartridge of claim 5 wherein said water insoluble polymer in said non-skin engaging layer comprises a polymer selected from the group consisting of polystyrene, high impact polystyrene, polypropylene, filled polypropylene and nylon.
  • 7. The razor cartridge of claim 1, 2 or 3 wherein said non-skin engaging layer additionally comprises a water soluble polymer.
  • 8. The razor cartridge of claim 1, 2 or 3 wherein said skin engaging layer comprises an elongated sheath and said non-skin engaging layer comprises a core extending axially throughout said sheath.
  • 9. The razor cartridge of claim 1 or 3 wherein said razor cartridge has an effective life and said skin engaging layer is adapted to erode during use to visually expose said non-skin engaging layer when said effective life ends.
  • 10. The razor cartridge of claim 1 or 3 wherein said skin engaging member has an effective life and said skin engaging layer is adapted to erode during use to visually expose said non-skin engaging layer when said effective life ends.
  • 11. The razor cartridge of claim 1 or 3 wherein said non-skin engaging layer additionally comprises polyethylene oxide.
  • 12. The razor cartridge of claim 1 or 3 wherein said skin engaging layer and said non-skin engaging layer are coextruded.
  • 13. A razor cartridge comprising a blade mounted in a frame, and an immovable skin engaging member affixed adjacent said blade, at least a portion of said skin engaging member extending outwardly from said frame and located such that it contacts the skin of a user during shaving, said skin engaging member comprising two adjoining disparately colored, solid polymeric layers, said layers comprising an erodible skin engaging layer of a first color overlying a non-skin engaging layer of a different color, wherein said skin engaging layer is adapted to erode during contact with said skin during shaving to visually expose said non-skin engaging layer over time.
  • 14. The razor cartridge of claim 13 wherein said razor cartridge has an effective life and said skin engaging layer is adapted to erode during use to visually expose said non-skin engaging layer at the time said effective life ends.
  • 15. A razor cartridge comprising a blade mounted in a frame, and an immovable elongated skin engaging member affixed adjacent said blade and substantially parallel to a shaving edge of said blade, at least a portion of said skin engaging member extending outwardly from said frame and located such that it contacts the skin of a user during shaving, said skin engaging member comprising, prior to assembly into said cartridge and prior to use during shaving, two adjoining disparately colored, solid polymeric layers, said layers comprising an erodible skin engaging layer of a first color overlying a non-skin engaging layer of a different color, said skin engaging layer having a substantially uniform thickness along its length and comprising a blend of a water soluble shaving aid and a water insoluble polymer, said water soluble shaving aid being water-leachable from said skin engaging layer, and said non-skin engaging layer comprising a water insoluble polymer.
  • 16. A razor cartridge comprising a blade mounted in a frame, and an immovable elongated skin engaging member affixed adjacent said blade and substantially parallel to a shaving edge of said blade, at least a portion of said skin engaging member extending outwardly from said frame and located such that it contacts the skin of a user during shaving, said skin engaging member comprising, prior to assembly into said cartridge and prior to use during shaving, two adjoining disparately colored, solid polymeric layers, said layers comprising an erodible skin engaging layer of a first color overlying a non-skin engaging layer of a different color, said skin engaging layer having a substantially uniform thickness along its length and comprising a blend of polyethylene oxide and a water insoluble polymer, said polyethylene oxide being water-leachable from said skin engaging layer, and said non-skin engaging layer comprising a water insoluble polymer.
  • 17. The razor cartridge of claim 16 wherein said water insoluble polymer in said skin engaging layer comprises a polymer selected from the group consisting of nylon, ethylene vinyl acetate, polyethylene, polypropylene, polystyrene and polyacetal.
  • 18. The razor cartridge of claim 17 wherein said water insoluble polymer in said non-skin engaging layer comprises a polymer selected from the group consisting of polystyrene, high impact polystyrene, polypropylene, filled polypropylene and nylon.
  • 19. The razor cartridge of claim 18 wherein said non-skin engaging layer additionally comprises polyethylene oxide.
  • 20. The razor cartridge of claim 19 wherein said skin engaging layer comprises 65% to 82% by weight polyethylene oxide.
  • 21. The razor cartridge of claim 15 or 20 wherein said skin engaging layer and said non-skin engaging layer are coextruded.
  • 22. A razor cartridge comprising a blade mounted in a frame, and an immovable elongated skin engaging member affixed adjacent said blade and substantially parallel to a shaving edge of said blade, at least a portion of said skin engaging member extending outwardly from said frame and located such that it contacts the skin of a user during shaving, said skin engaging member comprising two adjoining disparately colored, solid polymeric layers, said layers comprising an erodible skin engaging layer of a first color overlying a non-skin engaging layer of a different color, wherein said skin engaging layer has a substantially uniform thickness along its length.
Parent Case Info

This application is a continuation-in-part of U.S. Ser. No. 08/269,495, filed Jul. 1, 1994, now abandoned.

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Continuation in Parts (1)
Number Date Country
Parent 08/269495 Jul 1994 US
Child 08/461318 US