Assignee
PROTEL INC
US·24 granted patents·700 citations·filing 1986–2001
Top patents by PatentIndex Score
24 records- 0182US5903629AApparatus and method for automated audio teleconferencing having enhanced reconfiguration featuresPROTEL INC·Filed 1996·Granted May 11, 1999·129 cites·30 claims
- 0281US5351798ACoin discrimination apparatus and methodPROTEL INC·Filed 1993·Granted Oct 4, 1994·67 cites·26 claims
- 0379US5719928AApparatus and method for automated audio teleconferencing having enhanced billing and reservation featuresPROTEL INC·Filed 1995·Granted Feb 17, 1998·108 cites·51 claims
- 0471US5828743AApparatus and method for automated audio teleconferencing having enhanced access and security featuresPROTEL INC·Filed 1995·Granted Oct 27, 1998·71 cites·54 claims
- 0570USD430149SHandset cable plate for a pay telephonePROTEL INC·Filed 1999·Granted Aug 29, 2000·20 cites·1 claims
- 0668US6850607B2Intelligent vending system and methodPROTEL INC·Filed 2001·Granted Feb 1, 2005·10 cites·24 claims
- 0768USD375953STelephone card reader consolePROTEL INC·Filed 1995·Granted Nov 26, 1996·16 cites·1 claims
- 0867US6301344B1Intelligent public telephone system and methodPROTEL INC·Filed 1998·Granted Oct 9, 2001·46 cites·22 claims
- 0964US4860346ATelephone system and method operated from central office loop currentPROTEL INC·Filed 1986·Granted Aug 22, 1989·24 cites·22 claims
- 1063US5191957ACoin discrimination methodPROTEL INC·Filed 1991·Granted Mar 9, 1993·30 cites·11 claims
- 1163US4759054AToll telephone system and method for maintaining or initiating loop current after resuming on-hook conditionPROTEL INC·Filed 1986·Granted Jul 19, 1988·23 cites·5 claims
- 1257US7239694B2Integrated circuit configurations and methods for providing functions for public telephonesPROTEL INC·Filed 2001·Granted Jul 3, 2007·2 cites·18 claims
- 1356US6625267B1Billing systemPROTEL INC·Filed 1999·Granted Sep 23, 2003·27 cites·20 claims
- 1453US5568854ACoin discrimination methodPROTEL INC·Filed 1994·Granted Oct 29, 1996·19 cites·4 claims
- 1553US5027390ACoin validation method and apparatus for a coin telephone or similar system having an escrow mechanismPROTEL INC·Filed 1989·Granted Jun 25, 1991·13 cites·5 claims
- 1652US5687830AItem discrimination apparatus and methodPROTEL INC·Filed 1996·Granted Nov 18, 1997·16 cites·16 claims
- 1748US4860345ATelephone system and method operated from central office loop currentPROTEL INC·Filed 1988·Granted Aug 22, 1989·11 cites·3 claims
- 1846US5841847ABilling systemPROTEL INC·Filed 1997·Granted Nov 24, 1998·50 cites·18 claims
- 1935USD299341SHousing for a key pad, carrier select and credit card bezel for coin telephonesPROTEL INC·Filed 1987·Granted Jan 10, 1989·3 cites·1 claims
- 2035US4759050AIntelligent toll telephone system and methodPROTEL INC·Filed 1986·Granted Jul 19, 1988·4 cites·11 claims
- 2132USD429712SFront face bezel for a pay telephonePROTEL INC·Filed 1999·Granted Aug 22, 2000·3 cites·1 claims
- 2231USD299133SKey pad and credit card bezel for coin telephonesPROTEL INC·Filed 1987·Granted Dec 27, 1988·2 cites·1 claims
- 2330USD429711SPay telephonePROTEL INC·Filed 1999·Granted Aug 22, 2000·2 cites·1 claims
- 2418US5430797ACoin return coverPROTEL INC·Filed 1993·Granted Jul 4, 1995·4 cites·21 claims
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →