Assignee
QUADRUM TELECOMMUNICATIONS INC
US·18 granted patents·87 citations·filing 1990–1998
Top patents by PatentIndex Score
18 records- 0156US5134654AHigh security upper housing shield for telephone paystationQUADRUM TELECOMMUNICATIONS INC·Filed 1991·Granted Jul 28, 1992·26 cites·17 claims
- 0247USD408404SPay telephone housing with programmable keys and LCD displayQUADRUM TELECOMMUNICATIONS INC·Filed 1998·Granted Apr 20, 1999·6 cites·1 claims
- 0345US5155765ATelephone paystation lower housing armorQUADRUM TELECOMMUNICATIONS INC·Filed 1991·Granted Oct 13, 1992·14 cites·8 claims
- 0433US5887053ACoin return anti-stuffing apparatus and methodQUADRUM TELECOMMUNICATIONS INC·Filed 1997·Granted Mar 23, 1999·5 cites·30 claims
- 0533USD330209SHigh security telephone instrumentQUADRUM TELECOMMUNICATIONS INC·Filed 1991·Granted Oct 13, 1992·2 cites·1 claims
- 0633US5058966AVault liner for use in coin telephonesQUADRUM TELECOMMUNICATIONS INC·Filed 1991·Granted Oct 22, 1991·4 cites·11 claims
- 0732US6047065ACoin receptacle cover for pay telephonesQUADRUM TELECOMMUNICATIONS INC·Filed 1997·Granted Apr 4, 2000·2 cites·22 claims
- 0832US5737401AFull coin box signalling device for use with coin telephonesQUADRUM TELECOMMUNICATIONS INC·Filed 1996·Granted Apr 7, 1998·5 cites·9 claims
- 0932US5193113AProtective plate for paystation anti-stuffing deviceQUADRUM TELECOMMUNICATIONS INC·Filed 1991·Granted Mar 9, 1993·3 cites·8 claims
- 1031US5084613AElectronic circuit for telephone paystation coin operated triggerQUADRUM TELECOMMUNICATIONS INC·Filed 1991·Granted Jan 28, 1992·3 cites·16 claims
- 1130US6275584B1Telephone housing with large capacity vaultQUADRUM TELECOMMUNICATIONS INC·Filed 1998·Granted Aug 14, 2001·1 cites·12 claims
- 1230US6044139APlastic coin receptacle for pay telephonesQUADRUM TELECOMMUNICATIONS INC·Filed 1998·Granted Mar 28, 2000·0 cites·4 claims
- 1329US5709294ANon-jamming coin chute trigger assembly for pay telephonesQUADRUM TELECOMMUNICATIONS INC·Filed 1996·Granted Jan 20, 1998·0 cites·4 claims
- 1429US5676232ACoin chute trigger assembly for pay telephones with microswitchesQUADRUM TELECOMMUNICATIONS INC·Filed 1996·Granted Oct 14, 1997·0 cites·7 claims
- 1529US5086465AArmored telephone cord retention bracketQUADRUM TELECOMMUNICATIONS INC·Filed 1991·Granted Feb 4, 1992·3 cites·8 claims
- 1628US5418851AShock preventing telephone handset for paystationQUADRUM TELECOMMUNICATIONS INC·Filed 1994·Granted May 23, 1995·0 cites·5 claims
- 1727US5038908ASelf-locking coin receptacle coverQUADRUM TELECOMMUNICATIONS INC·Filed 1990·Granted Aug 13, 1991·12 cites·6 claims
- 1823US5064116ACoin hopper relayQUADRUM TELECOMMUNICATIONS INC·Filed 1990·Granted Nov 12, 1991·1 cites·9 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →