Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 17 - Prepayment telephone systems
Patents for H04M 17 - Prepayment telephone systems (5,258)
04/1992
04/23/1992CA2053679A1 Multi-purpose public facsimile transmission terminal
04/22/1992EP0481482A2 Auxiliary unit for home telephone allowing use of prepaid cards
04/14/1992US5105460 Plug-in telephone facility
03/1992
03/28/1992WO1992006549A1 Cordless telephone with internal debit and credit memory
03/28/1992CA2089367A1 Cordless telephone with internal debit and credit memory
03/04/1992EP0473527A2 Modular public telephones credit cards validation and invoicing centre
03/03/1992US5093858 Method and apparatus for performing an automated collect call
02/1992
02/04/1992US5086465 Armored telephone cord retention bracket
02/04/1992US5086457 Prepayment data transmission system
02/04/1992US5086456 Dial unit detachably mounted on public telephone for equal access
01/1992
01/29/1992EP0468913A2 Modular public telephones operating system
01/28/1992US5084613 Electronic circuit for telephone paystation coin operated trigger
01/14/1992CA2042900A1 Coin telephone box with anti-stuffing coin return chute
01/07/1992CA1294000C2 Cellular mobile radio credit card system
12/1991
12/27/1991EP0433343A4 Improvements in mobile pay telephone system
12/18/1991EP0311607B1 Shared flexible rating of telecommunications calls
12/04/1991EP0458791A1 Payphone system.
11/1991
11/28/1991WO1991018468A1 Real time cellular phone rental system and method
11/27/1991EP0458723A2 Validation and identification unit in a modular public telephone management system using credit cards
11/26/1991US5068891 Credit control system for long distance telephone services
11/23/1991WO1991018467A1 Cellular phone rental system
11/23/1991CA2083515A1 Cellular telephone system with remote programming, voice responsive registration, and real time billing
11/12/1991WO1991018169A1 Electronic security system
10/1991
10/29/1991US5061023 Telephone terminal bases
10/23/1991EP0453389A2 Modular public telephones management system
10/22/1991US5058966 Vault liner for use in coin telephones
10/01/1991US5054057 Coin blocker
10/01/1991US5054056 Tamper-deterrent device
09/1991
09/25/1991EP0447890A2 Monochannel device for control, storage and collection of coins
09/16/1991WO1991014330A1 Telephone call detecting circuit and a method of remotely accessing and testing a telephone
09/16/1991CA2077747A1 Telephone call detecting circuit and a method of remotely accessing and testing a telephone
09/03/1991US5046183 Semi-automated operator assistance telecommunication calls
09/03/1991US5046085 Interfacing system for an international-type pay-telephone
08/1991
08/27/1991US5043983 Time and charges information delivery for operator assistance telecommunication calls
08/27/1991CA1288152C Fraud prevention in a public telephone station
08/22/1991DE4005485A1 Switch hook device for telephone kiosk - uses spring and plunger to provide switching function
07/1991
07/31/1991EP0438406A1 Apparatus for use with a telephone
07/25/1991WO1991011069A1 Public access facsimile system
07/02/1991US5027935 Apparatus and method for conserving power in an electronic coin chute
06/1991
06/26/1991EP0433343A1 Improvements in mobile pay telephone system
06/25/1991US5027390 Coin validation method and apparatus for a coin telephone or similar system having an escrow mechanism
06/13/1991WO1991008637A1 Payphone system
06/09/1991WO1991009370A1 Method and system for remote delivery of retail banking services
06/04/1991US5022073 For a pay telephone
06/04/1991US5022067 Telephone call security system
05/1991
05/29/1991EP0429176A2 Prepaid card management system
05/29/1991CN1012708B Operation mode of charge system of crossbar telephone switchboard
05/28/1991US5020097 Telephone with data setting by remote control
05/21/1991US5018193 Coin telephone box with anti-stuffing coin return chute
05/21/1991US5018185 Tamperproof pay telephone
05/07/1991US5014301 International speaker telephone
05/02/1991EP0424495A1 Voice messaging for pay phone telephone systems.
05/02/1991DE3935678A1 Coin operated telephone appts. - has cassette of wedge-shaped underside with rectangular plan on appts. housing
04/1991
04/16/1991US5008929 Billing system for telephone signaling network
04/16/1991US5008928 Public access facsimile system
04/16/1991US5007520 Microprocessor-controlled apparatus adaptable to environmental changes
04/09/1991US5007077 Coin telephone message and management system
03/1991
03/28/1991DE3930869A1 Telephone set with simplified selection of numbers - uses scanner for memory with store numbers, capable of charging calls to scanner owners number
03/27/1991CN1050297A Method and apparatus for keyboard adaptation to low power controller in coin operated telephone
03/27/1991CN1050296A Method and apparatus for retrofitting standard coin operated telephone employing carbon microphone with line powered electronic controller
03/27/1991CN1050295A Method and apparatus for preventing pay telephone fraud and reducing handset vandalism
03/20/1991EP0417979A2 Method and apparatus for preventing pay telephone fraud and reducing handset vandalism
03/20/1991EP0417978A2 Method and apparatus for retrofitting a standard coin operated telephone employing a carbon microphone with a line powered electronic controller
03/20/1991EP0417977A2 Method and apparatus for keyboard adaptation to a low power controller in a coin operated telephone
03/16/1991WO1991004628A1 Line powered electronic controller
03/16/1991WO1991004627A1 Method and apparatus for preventing pay telephone fraud and reducing handset vandalism
03/16/1991WO1991004626A1 Keyboard adaptation to low power controller in a coin telephone
03/05/1991CA1281110C Shared flexible rating of telecommunications calls
02/1991
02/19/1991US4995110 Method and apparatus for keyboard adaptation to a low power controller in a coin operated telephone
02/06/1991EP0411796A2 Semi-automated operator assistance telecommunication calls
02/05/1991US4991202 Coin call telephone apparatus
01/1991
01/29/1991US4989239 Method and apparatus for preventing pay telephone fraud and reducing handset vandalism
01/23/1991EP0409417A1 A pay telephone system
01/16/1991EP0249598B1 Rotating drum magazine for storing and managing coins in telephone sets or dispensers
01/15/1991US4985910 Method and apparatus for retrofitting a standard coin operated telephone employing a carbon microphone with a line powered electronic controller
01/02/1991CA1278605C Radio phone equipment for credit card
12/1990
12/27/1990EP0404432A2 Microprocessor-controlled apparatus adaptable to environmental changes
12/20/1990CA2011560A1 Microprocessor-controlled apparatus adaptable to environmental changes
12/18/1990US4979208 Method and apparatus for electronic payphone open switch interval management
12/13/1990WO1990015496A1 Credit control system for long distance telephone services
12/04/1990US4975942 Credit/calling card pay telephone method and system employing telephone unit local card-checking and other intelligence cooperative with local personal host computer
11/1990
11/27/1990US4974257 Modular public telephone for outside use
11/20/1990US4972461 Call message delivery system and method
11/15/1990WO1990013961A1 Voice messaging for pay phone telephone systems
11/13/1990CA1276239C Cellular mobile radio credit card system
10/1990
10/31/1990EP0394600A2 Outdoor modular public telephone
10/23/1990US4965821 Cellular mobile radiotelephone-based system for rental of mobile equipment
10/09/1990US4962520 Composite ringing and coin control voltage detector and method
09/1990
09/27/1990DE3909675A1 Barring of DTMF subscriber numbers
09/18/1990CA1274329A1 Telephone system and method operated from central office loop current
09/04/1990US4955052 Pay phone system and apparatus
09/04/1990CA1273722A1 Armored cord handset
08/1990
08/21/1990US4951308 Automated vending of cellular hand-held telephones and cellular telephone services
08/21/1990CA1273140A1 Device for initializing public telephone charges
08/14/1990CA1272819A1 Intelligent toll telephone system and method
08/07/1990US4947422 Personalized telephone for automatic access to operator services
08/07/1990US4946418 Rotating drum magazine for storing and managing coins in telephone sets or dispensers
08/07/1990CA1272530A1 Toll telephone system and method for maintaining or initiating loop current after resuming onhook condition
08/02/1990DE3902568A1 System for local, synchronous billing of telephone charges in digital telephone systems which are connected to ISDN exchange lines
08/01/1990EP0380190A2 Automatic generation of billing records
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