Assignee
PROTEL INC
US24 patents
Top patents by PatentIndex Score
US5903629AMay 11, 1999
Apparatus and method for automated audio teleconferencing having enhanced reconfiguration features
PROTEL INC129 citations94
US5719928AFeb 17, 1998
Apparatus and method for automated audio teleconferencing having enhanced billing and reservation features
PROTEL INC108 citations94
US5351798AOct 4, 1994
Coin discrimination apparatus and method
PROTEL INC67 citations94
US6625267B1Sep 23, 2003
Billing system
PROTEL INC27 citations92
US6301344B1Oct 9, 2001
Intelligent public telephone system and method
PROTEL INC46 citations92
US5841847ANov 24, 1998
Billing system
PROTEL INC50 citations92
US5828743AOct 27, 1998
Apparatus and method for automated audio teleconferencing having enhanced access and security features
PROTEL INC71 citations92
US5191957AMar 9, 1993
Coin discrimination method
PROTEL INC30 citations90
US4860346AAug 22, 1989
Telephone system and method operated from central office loop current
PROTEL INC24 citations90
US5568854AOct 29, 1996
Coin discrimination method
PROTEL INC19 citations89
USD430149SAug 29, 2000
Handset cable plate for a pay telephone
PROTEL INC20 citations86
US4759054AJul 19, 1988
Toll telephone system and method for maintaining or initiating loop current after resuming on-hook condition
PROTEL INC23 citations80
US5687830ANov 18, 1997
Item discrimination apparatus and method
PROTEL INC16 citations78
US5027390AJun 25, 1991
Coin validation method and apparatus for a coin telephone or similar system having an escrow mechanism
PROTEL INC13 citations72
USD375953SNov 26, 1996
Telephone card reader console
PROTEL INC16 citations71
US4860345AAug 22, 1989
Telephone system and method operated from central office loop current
PROTEL INC11 citations71
US6850607B2Feb 1, 2005
Intelligent vending system and method
PROTEL INC10 citations69
US4759050AJul 19, 1988
Intelligent toll telephone system and method
PROTEL INC4 citations60
USD299341SJan 10, 1989
Housing for a key pad, carrier select and credit card bezel for coin telephones
PROTEL INC3 citations57
USD299133SDec 27, 1988
Key pad and credit card bezel for coin telephones
PROTEL INC2 citations57
USD429711SAug 22, 2000
Pay telephone
PROTEL INC2 citations56
USD429712SAug 22, 2000
Front face bezel for a pay telephone
PROTEL INC3 citations56
US7239694B2Jul 3, 2007
Integrated circuit configurations and methods for providing functions for public telephones
PROTEL INC2 citations52
US5430797AJul 4, 1995
Coin return cover
PROTEL INC4 citations46