The present technology relates to connectors, such as male cable connectors, that include a locking mechanism to prevent loosening or separation when coupled to a corresponding connector, such as a female connector.
Electrical connectors are used in a variety of applications to interconnect electrical circuits and devices. One such connector is the screw-on, threaded F-type connector (or “F-connector”), which is used on most radio frequency (RF) coaxial cables to interconnect TVs, cable TV decoders, VCR/DVD's, hard disk digital recorders, satellite receivers, and other devices. Male F-type connectors are typically attached to the end of a coaxial cable with the central conductor of the coaxial cable extending therefrom. Male F-type connectors (sometimes called the “male connector” or “male F-connector”) have a standardized design, generally using a 7/16 inch hex nut as a fastener. The nut has a relatively short (e.g., ⅛ to ¼ inch) length and can be grasped by a person's fingers to be tightened or loosened.
In order to maintain a tight electrical connection, and to achieve the intended electrical performance, manufacturers and industry standards often require an F-type connector to be tightened to an attachment structure (with respect to F-connectors, these attachment structures are sometimes called the “female connector” or “female F-connector”) beyond the torque achievable by using only a person's fingers. In the case of cable TV products, for example, the standard has been to tighten the fastener using a 25 in-lb torque (or to tighten another 90-120 degrees from the finger-tight position). Conversely, consumer products, which have weaker attachment structures (such as plastic), require F-type connector fasteners to be wrench-tightened just slightly beyond finger tight.
A person tightening a fastener by hand may only be able to apply 4-5 in-lbs of torque to an F-connector fastener using his/her fingers, whereas 10-25 in-lbs of torque may be required to properly secure an F-connector fastener to an attachment structure. If a person were, however, to use a wrench to tighten the same fastener, in addition to the wrench being bulky and inconvenient, the person runs the risk of over-tightening the fastener and potentially damaging the attachment structure. Applying too little or too much torque can thus result in increases in returns to the manufacturer, customer service calls, and complaints from consumers.
Furthermore, a number of factors, including vibration and thermal cycling, can cause the threaded connection between the male and female connectors to loosen and/or separate, resulting in signal loss or degradation of electrical performance. Similar issues exist with maintaining the connection between other types of male and female connectors, such as RCA connectors, “plug and socket” connectors, and/or blade connectors.
The present disclosure describes connectors with locking mechanisms and associated systems and methods. A connector configured in accordance with an embodiment of the present technology includes a locking mechanism that compresses a male connector inwardly over a female connector, and thereby locks the male and female connectors together to substantially reduce signal loss or degradation of electrical performance caused by a loose connection. The connector can be configured to engage threaded and/or unthreaded surfaces. Additionally, the connector can reduce or prevent damage to electronic components caused by over-tightening the connector. Certain details are set forth in the following description and in
Many of the details, dimensions, angles and other features shown in
An exemplary first connector 100 (e.g., a male F-type connector; previously referred to as a “female” F-type connector in related provisional application No. 61/347,364) according to aspects of the present technology is depicted in
In alternate embodiments, the connector may be a female connector configured to securely engage a corresponding male connector. In another embodiment, for example, an RCA plug (a male connector) includes a locking mechanism to secure it to a corresponding female RCA connector.
The collet 110 may be any size, shape, or configuration to interface with a mating connector (such as a corresponding female connector). As stated previously, in some embodiments of the present technology, the collet 110 may be part of a male connector other than an F-type male connector, and configured to interface with a corresponding female connector (such as in the case of an RCA connector, USB connector, or other connector where a male plug on a cable is joined with a female socket). The collet 110 may be formed from any suitable material. In one embodiment, for example, the collet 110 is at least partially formed from a metal, such as brass, copper, steel, stainless steel, aluminum, metalized composite plastic, etc. In one embodiment, the collet 110 is formed from a material that is both deformable (to compress against the female connector when the locking mechanism 120 is in the locked position) and resilient (to substantially return to its shape before compression when the locking mechanism 120 is in the open position). In the exemplary embodiment depicted in
The collet 110 includes an inner surface 112 defining a bore for receiving the mating connector (e.g., a corresponding female connector). In the exemplary embodiment depicted in
The bore defined by the inner surface 112 may be any size, shape, and configuration to interface with a corresponding mating (e.g., female) connector. In one embodiment, the bore is substantially cylindrical. In another embodiment, the bore is tapered. The bore can be tapered in any manner. For example, the bore may be tapered such that the diameter of the bore at the distal end of the collet 110 (i.e., where the female connector is inserted) is smaller than the diameter of the bore at the proximal end of collet 110. Among other things, the tapering of the bore helps secure the collet 110 to the female connector when the locking mechanism 120 is in the locked position. The outer surface of the collet 110 may also be of any size, shape, and configuration. For example, the collet 110 may be cylindrical or tapered to match the taper of the bore. However, the size, shape, or configuration of the outer surface of the collet 110 may be independent of the size, shape, or configuration of the bore. For example, the outer surface of the collet 110 may be cylindrical, while the inner bore is tapered.
The locking mechanism 120 is configured to engage the collet 110 to secure the collet 110 to the female connector. The locking mechanism 120 may be include any device configurable to secure the collet 110 to the female connector, including a latch, hook, snap, clasp, and/or clamp. The locking mechanism 120 may be configured to be manipulated between its open and locked positions by a human hand, by a tool, or both.
In this exemplary embodiment, the locking mechanism 120 includes a first portion 122 configured to engage the collet 110 when the locking mechanism 120 is moved to its locked position. A second portion 124 of the latch 120 is configured to hold the latch 120 in the locked position until a user moves the latch 120 back into the open position. In this embodiment, the second portion 124 is a hook that engages a corresponding hook 126 on the body of the connector 200 to hold the locking mechanism 120 in the locked position. Among other things, this prevents unwanted loosening of the male connector 200 from the female connector due to thermal cycling, vibration and/or stress on the cable to which the connector 200 is attached.
The locking mechanism 120 and body of the connector 200 may be formed from any suitable materials. In the exemplary embodiment depicted in
In another exemplary embodiment, referring now to
Connectors 100 and 200 may be attached to a cable 135 in any suitable manner. In one exemplary embodiment, as best seen in
As illustrated to good effect in
Referring to
As shown in
The connector 1200 also includes a first latch 1221a and a second latch 1221b which are pivotally coupled to the connector body 1202 adjacent openings 1204a, b. In the illustrated embodiment, the latches 1221a and 1221b are identical, or at least substantially identical to each other. Each of the latches 1221 includes a driving portion 1222 and a locking portion 1224. As with the connector 900 described above, the driving portions 1222 are configured to drive the collet 1210 forward in the connector body 1222. As the collet 1210 moves forward, a plurality of slots 1211a-d in the collet 1210 (
Although the connector 1200 is structurally and functionally similar to the connectors described above, in the illustrated embodiment the driving portions 1222 of the latches 1221 include both a driving surface 1307 and a clamping surface 1308. When the latches 1221 are moved inwardly in direction C toward the “closed” position, the driving surfaces 1307 contact a rear surface portion 1314 of the collet 1210 and drive the collet 1210 forward in direction F to clamp the collet 1210 on to the connector 1150 (
Accordingly, in the illustrated embodiment the driving portions 1222 perform two functions: they drive the collet 1210 forward to engage the collet 1210 with the mating connector 1150, and they squeeze the cable 1235 to help secure the cable 1235 to the connector 1200. One benefit of this particular embodiment is that the connector 1200 does not need a cable retainer, such as the retainer 930 described above.
The connector body 1202 also includes a first attachment feature 1470a and the second attachment feature 1470b. In the illustrated embodiment, each attachment feature 1470 includes opposing cylindrical pin portions 1474. The pin portions 1474 can be received in corresponding sockets on the latches 1221 (
From the foregoing, it will be appreciated that specific embodiments have been described herein for purposes of illustration, but that modifications may be made without deviating from the spirit and scope of the various embodiments of the disclosure. The connector shown in the Figures, for example, can include more or less latches, threads, slots, etc. Additionally, as described above, the locking mechanism can be part of a male connector, but in other embodiments the locking mechanism can be on the female connector. Moreover, specific elements of any of the foregoing embodiments can be combined or substituted for elements in other embodiments. Certain aspects of the disclosure are accordingly not limited to automobile or aircraft systems. Furthermore, while advantages associated with certain embodiments of the disclosure have been described in the context of these embodiments, other embodiments may also exhibit such advantages, and not all embodiments need necessarily exhibit such advantages to fall within the scope of the technology. Accordingly, the disclosure is not limited except as by the appended claims.
The present application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Application No. 61/347,364, filed May 21, 2010; and U.S. Provisional Application No. 61/432,871, filed Jan. 14, 2011; the disclosures of which are incorporated herein by reference if their entireties.
Number | Name | Date | Kind |
---|---|---|---|
2178365 | Brobst | Oct 1939 | A |
2232846 | Freydberg | Feb 1941 | A |
2233216 | Matthysse | Feb 1941 | A |
2304711 | Shenton | Dec 1942 | A |
D140861 | Conlan | Apr 1945 | S |
2669695 | Bird | Sep 1952 | A |
3076235 | Rollins et al. | Feb 1963 | A |
3274447 | Nelson | Sep 1966 | A |
3275737 | Caller | Sep 1966 | A |
3344227 | Gilmartin et al. | Sep 1967 | A |
3366920 | Laudig et al. | Jan 1968 | A |
3229623 | Kempf | Apr 1968 | A |
3390374 | Forney, Jr. | Jun 1968 | A |
3489988 | Carnaghan | Jan 1970 | A |
3517375 | Mancini | Jun 1970 | A |
3544705 | Winston | Dec 1970 | A |
3601776 | Curl | Aug 1971 | A |
3609651 | Sladek et al. | Sep 1971 | A |
3653689 | Sapy et al. | Apr 1972 | A |
3662090 | Grey | May 1972 | A |
3671922 | Zerlin et al. | Jun 1972 | A |
3708781 | Trompeter | Jan 1973 | A |
3740453 | Callaghan et al. | Jun 1973 | A |
3746931 | Muranaka | Jul 1973 | A |
3777298 | Newman | Dec 1973 | A |
3778535 | Forney, Jr. | Dec 1973 | A |
3836700 | Niemeyer | Sep 1974 | A |
3863111 | Martzloff | Jan 1975 | A |
4029006 | Mercer | Jun 1977 | A |
4096346 | Stine et al. | Jun 1978 | A |
4100003 | Trusch | Jul 1978 | A |
4117260 | Wilkenloh | Sep 1978 | A |
4125739 | Bow | Nov 1978 | A |
4159859 | Shemtov | Jul 1979 | A |
4221926 | Schneider | Sep 1980 | A |
4225162 | Dola | Sep 1980 | A |
4307926 | Smith | Dec 1981 | A |
4371742 | Manly | Feb 1983 | A |
4400050 | Hayward | Aug 1983 | A |
4408822 | Nikitas | Oct 1983 | A |
4439632 | Aloisio et al. | Mar 1984 | A |
4465717 | Crofts et al. | Aug 1984 | A |
4472595 | Fox et al. | Sep 1984 | A |
4484023 | Gindrup | Nov 1984 | A |
4509090 | Kawanami et al. | Apr 1985 | A |
4515992 | Gupta | May 1985 | A |
RE31995 | Ball | Oct 1985 | E |
4557560 | Bohannon, Jr. et al. | Dec 1985 | A |
4564723 | Lang | Jan 1986 | A |
4569704 | Bohannon, Jr. et al. | Feb 1986 | A |
4572692 | Sauber | Feb 1986 | A |
4595431 | Bohannon, Jr. et al. | Jun 1986 | A |
4604773 | Weber et al. | Aug 1986 | A |
4619497 | Vogel et al. | Oct 1986 | A |
4633359 | Mickelson et al. | Dec 1986 | A |
4641110 | Smith | Feb 1987 | A |
4684201 | Hutter | Aug 1987 | A |
4691081 | Gupta | Sep 1987 | A |
4718854 | Capp et al. | Jan 1988 | A |
4729629 | Saito et al. | Mar 1988 | A |
4755152 | Elliot et al. | Jul 1988 | A |
4760362 | Maki | Jul 1988 | A |
4774148 | Goto | Sep 1988 | A |
4875864 | Campbell | Oct 1989 | A |
4894488 | Gupta | Jan 1990 | A |
4915651 | Bout | Apr 1990 | A |
4965412 | Lai | Oct 1990 | A |
4990106 | Szegda | Feb 1991 | A |
4997994 | Andrews et al. | Mar 1991 | A |
5011432 | Sucht et al. | Apr 1991 | A |
5041020 | Michael | Aug 1991 | A |
5043538 | Hughey, Jr. et al. | Aug 1991 | A |
5043539 | Connole et al. | Aug 1991 | A |
5049721 | Parnas et al. | Sep 1991 | A |
5073129 | Szegda | Dec 1991 | A |
5083943 | Tarrant | Jan 1992 | A |
5096444 | Lu et al. | Mar 1992 | A |
5123863 | Frederick et al. | Jun 1992 | A |
5132491 | Mulrooney et al. | Jul 1992 | A |
5141448 | Mattingly et al. | Aug 1992 | A |
5145382 | Dickirson | Sep 1992 | A |
5147221 | Cull et al. | Sep 1992 | A |
5161993 | Leibfried, Jr. | Nov 1992 | A |
5195905 | Pesci | Mar 1993 | A |
5195910 | Enomoto et al. | Mar 1993 | A |
5198958 | Krantz, Jr. | Mar 1993 | A |
5205547 | Mattingly | Apr 1993 | A |
5216202 | Yoshida et al. | Jun 1993 | A |
5217393 | Del Negro et al. | Jun 1993 | A |
5237293 | Kan et al. | Aug 1993 | A |
5276415 | Lewandowski et al. | Jan 1994 | A |
5281167 | Le et al. | Jan 1994 | A |
5284449 | Vaccaro | Feb 1994 | A |
5295864 | Birch et al. | Mar 1994 | A |
5306170 | Luu | Apr 1994 | A |
5316348 | Franklin | May 1994 | A |
5318458 | Thorner | Jun 1994 | A |
5329064 | Tash | Jul 1994 | A |
5355720 | Bailey | Oct 1994 | A |
5367925 | Gasparre | Nov 1994 | A |
5383708 | Nagasaka et al. | Jan 1995 | A |
5412856 | Nazerian et al. | May 1995 | A |
5414213 | Hillburn | May 1995 | A |
5439399 | Spechts et al. | Aug 1995 | A |
5470257 | Szegda | Nov 1995 | A |
5471144 | Meyer et al. | Nov 1995 | A |
5498175 | Yeh et al. | Mar 1996 | A |
5507537 | Meisinger et al. | Apr 1996 | A |
5525076 | Down | Jun 1996 | A |
5548088 | Gray et al. | Aug 1996 | A |
5560536 | Moe | Oct 1996 | A |
5564938 | Shenkal et al. | Oct 1996 | A |
5595499 | Zander et al. | Jan 1997 | A |
5607325 | Toma | Mar 1997 | A |
5632633 | Roosdorp et al. | May 1997 | A |
5632651 | Szegda | May 1997 | A |
5651698 | Locati et al. | Jul 1997 | A |
5660565 | Williams | Aug 1997 | A |
5667409 | Wong et al. | Sep 1997 | A |
5700160 | Lee | Dec 1997 | A |
5707465 | Bibber | Jan 1998 | A |
5719353 | Carlson et al. | Feb 1998 | A |
5724220 | Chaudhry | Mar 1998 | A |
5730622 | Olson | Mar 1998 | A |
5796042 | Pope | Aug 1998 | A |
5829992 | Merker et al. | Nov 1998 | A |
5830010 | Miskin et al. | Nov 1998 | A |
5857711 | Comin-DuMong et al. | Jan 1999 | A |
5860833 | Chillscyzn et al. | Jan 1999 | A |
5863226 | Lan et al. | Jan 1999 | A |
5865654 | Shimirak et al. | Feb 1999 | A |
5882233 | Idehara | Mar 1999 | A |
5890762 | Yoshida | Apr 1999 | A |
5926949 | Moe et al. | Jul 1999 | A |
5927975 | Esrock | Jul 1999 | A |
5938465 | Fox, Sr. | Aug 1999 | A |
5945632 | Butera | Aug 1999 | A |
5949018 | Esker | Sep 1999 | A |
5953195 | Pagliuca | Sep 1999 | A |
5959245 | Moe et al. | Sep 1999 | A |
5969295 | Boucino et al. | Oct 1999 | A |
5984378 | Ostrander et al. | Nov 1999 | A |
5991136 | Kaczmarek et al. | Nov 1999 | A |
6010349 | Porter, Jr. | Jan 2000 | A |
6011218 | Burek et al. | Jan 2000 | A |
6024408 | Bello | Feb 2000 | A |
6027373 | Gray et al. | Feb 2000 | A |
6037545 | Fox et al. | Mar 2000 | A |
6042422 | Youtsey | Mar 2000 | A |
6048233 | Cole | Apr 2000 | A |
6065997 | Wang | May 2000 | A |
6071144 | Tang | Jun 2000 | A |
6087017 | Bibber | Jul 2000 | A |
6109963 | Follingstad et al. | Aug 2000 | A |
6113431 | Wong | Sep 2000 | A |
6127441 | Sakamoto et al. | Oct 2000 | A |
6137058 | Moe et al. | Oct 2000 | A |
6140582 | Sheehan | Oct 2000 | A |
6142788 | Han | Nov 2000 | A |
6146196 | Burger et al. | Nov 2000 | A |
6148130 | Lee et al. | Nov 2000 | A |
6174206 | Yentile et al. | Jan 2001 | B1 |
6183297 | Kay et al. | Feb 2001 | B1 |
6183298 | Henningsen | Feb 2001 | B1 |
6201189 | Carlson et al. | Mar 2001 | B1 |
6201190 | Pope | Mar 2001 | B1 |
6204445 | Gialenios et al. | Mar 2001 | B1 |
6210221 | Maury | Apr 2001 | B1 |
6210222 | Langham et al. | Apr 2001 | B1 |
6246006 | Hardin et al. | Jun 2001 | B1 |
6249415 | Daoud et al. | Jun 2001 | B1 |
6250960 | Youtsey | Jun 2001 | B1 |
6265667 | Stipes et al. | Jul 2001 | B1 |
6282778 | Fox et al. | Sep 2001 | B1 |
6288628 | Fujimori | Sep 2001 | B1 |
6326551 | Adams | Dec 2001 | B1 |
6371585 | Kurachi | Apr 2002 | B2 |
6372990 | Saito et al. | Apr 2002 | B1 |
6384337 | Drum | May 2002 | B1 |
6396367 | Rosenberger | May 2002 | B1 |
D459306 | Malin | Jun 2002 | S |
6417454 | Biebuyck | Jul 2002 | B1 |
6450836 | Youtsey | Sep 2002 | B1 |
6462436 | Kay et al. | Oct 2002 | B1 |
6468100 | Meyer et al. | Oct 2002 | B1 |
6498301 | Pieper et al. | Dec 2002 | B1 |
6540293 | Quackenbush | Apr 2003 | B1 |
6545222 | Yokokawa et al. | Apr 2003 | B2 |
6591055 | Eslambolchi et al. | Jul 2003 | B1 |
6596393 | Houston et al. | Jul 2003 | B1 |
6610931 | Perelman et al. | Aug 2003 | B2 |
6648683 | Youtsey | Nov 2003 | B2 |
6712631 | Youtsey | Mar 2004 | B1 |
6734364 | Price et al. | May 2004 | B2 |
6770819 | Patel | Aug 2004 | B2 |
6798310 | Wong et al. | Sep 2004 | B2 |
6800809 | Moe et al. | Oct 2004 | B2 |
6800811 | Boucino | Oct 2004 | B1 |
6818832 | Hopkinson et al. | Nov 2004 | B2 |
6846536 | Priesnitz et al. | Jan 2005 | B1 |
6848939 | Stirling | Feb 2005 | B2 |
6858805 | Blew et al. | Feb 2005 | B2 |
6875928 | Hayes et al. | Apr 2005 | B1 |
6877996 | Franks, Jr. | Apr 2005 | B1 |
6915564 | Adams | Jul 2005 | B2 |
D508676 | Franks, Jr. | Aug 2005 | S |
6997999 | Houston et al. | Feb 2006 | B2 |
7022918 | Gialenios et al. | Apr 2006 | B2 |
7077475 | Boyle | Jul 2006 | B2 |
7084343 | Visser | Aug 2006 | B1 |
7127806 | Nelson et al. | Oct 2006 | B2 |
7131868 | Montena | Nov 2006 | B2 |
7144273 | Chawgo | Dec 2006 | B1 |
7147509 | Burris et al. | Dec 2006 | B1 |
7157645 | Huffman | Jan 2007 | B2 |
7159948 | Wolf | Jan 2007 | B1 |
7183743 | Geiger | Feb 2007 | B2 |
7198495 | Youtsey | Apr 2007 | B1 |
7278684 | Boyle | Oct 2007 | B2 |
7299550 | Montena | Nov 2007 | B2 |
7306484 | Mahoney et al. | Dec 2007 | B1 |
7311555 | Burris et al. | Dec 2007 | B1 |
7314998 | Amato et al. | Jan 2008 | B2 |
7350767 | Huang | Apr 2008 | B2 |
7404737 | Youtsey | Jul 2008 | B1 |
7468489 | Alrutz | Dec 2008 | B2 |
7497002 | Chawgo | Mar 2009 | B2 |
7500874 | Montena | Mar 2009 | B2 |
7507117 | Amidon | Mar 2009 | B2 |
7513795 | Shaw | Apr 2009 | B1 |
7566236 | Malloy et al. | Jul 2009 | B2 |
7837501 | Youtsey | Nov 2010 | B2 |
7841912 | Hachadorian | Nov 2010 | B2 |
7887354 | Holliday | Feb 2011 | B2 |
8075338 | Montena | Dec 2011 | B1 |
8079860 | Zraik | Dec 2011 | B1 |
8113875 | Malloy et al. | Feb 2012 | B2 |
8113879 | Zraik | Feb 2012 | B1 |
8152551 | Zraik | Apr 2012 | B2 |
8157589 | Krenceski et al. | Apr 2012 | B2 |
20020090856 | Weisz-Margulescu | Jul 2002 | A1 |
20030044606 | Iskander | Mar 2003 | A1 |
20040007308 | Houston et al. | Jan 2004 | A1 |
20040112356 | Hatcher | Jun 2004 | A1 |
20040222009 | Blew et al. | Nov 2004 | A1 |
20050042960 | Yeh et al. | Feb 2005 | A1 |
20050272311 | Tsao | Dec 2005 | A1 |
20060041922 | Shapson | Feb 2006 | A1 |
20060154522 | Bernhart et al. | Jul 2006 | A1 |
20060172571 | Montena | Aug 2006 | A1 |
20070291462 | Peng | Dec 2007 | A1 |
20100033001 | Boyer | Feb 2010 | A1 |
20100276176 | Amato | Nov 2010 | A1 |
20110011638 | Gemme | Jan 2011 | A1 |
20110011639 | Visser | Jan 2011 | A1 |
Number | Date | Country |
---|---|---|
3111832 | Oct 1982 | DE |
10050445 | Apr 2002 | DE |
1075698 | Nov 1999 | EP |
1335390 | Aug 2003 | EP |
2079549 | Jan 1982 | GB |
64002263 | Jan 1989 | JP |
2299182 | Dec 1990 | JP |
5347170 | Dec 1993 | JP |
2004128158 | Apr 2004 | JP |
WO9310578 | May 1993 | WO |
WO03013848 | Feb 2003 | WO |
WO2005006353 | Jan 2005 | WO |
WO2011009006 | Jan 2011 | WO |
WO2011146911 | Nov 2011 | WO |
Entry |
---|
International Search Report and Written Opinion; PCT Application No. PCT/US2011/037477; Applicant: Youtsey, Timothy; Date of Mailing: Jul. 11, 2011, 11 pages. |
U.S. Appl. No. 13/111,807, filed May 19, 2011, Youtsey. |
U.S. Appl. No. 13/111,817, filed May 19, 2011, Youtsey. |
U.S. Appl. No. 13/111,826, filed May 19, 2011, Youtsey. |
“F-type connectors”, ShowMe Cables, dated 2007 and printed on Jul. 9, 2008, 1 page, located at: http://www.showmecables.com/F-Type-Connectors.html. |
Latest quality F-connector Supply Information, China Quality F Connector list, Hardware-Wholesale.com, printed on Jul. 9, 2008, 6 pages, located at: http://www.hardware-wholesale.com/buy-F—Connector/. |
“Pico/Macom GRB-I” and “Pico/Macom GRB-2” single and dual coax cable ground blocks, Stallions Satellite and Antenna—Grounding Products, dated Nov. 9, 2005 and printed Aug. 17, 2011, 3 pgs., located online at: http://web.archive.org/web/20051109024213/http://tvantenna.com/products/installation/grounding .html. |
Number | Date | Country | |
---|---|---|---|
20110287653 A1 | Nov 2011 | US |
Number | Date | Country | |
---|---|---|---|
61347364 | May 2010 | US | |
61432871 | Jan 2011 | US |