Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 17 - Prepayment telephone systems
Patents for H04M 17 - Prepayment telephone systems (5,258)
08/1990
08/01/1990EP0380189A2 Method and apparatus for performing an automated collect call
07/1990
07/31/1990CA1272320A1 Answer detection method and apparatus for coin telephone sets
07/25/1990EP0378727A1 Device for converting private-user telephones into telephones enabled by obliterable pre-payment cards
07/24/1990US4942748 Security mechanism for telephone paystations
07/23/1990CA2007839A1 Method and apparatus for performing an automated collect call
07/17/1990US4942604 Line power control circuit for pay station telephone
07/10/1990US4941172 Preprogrammed autodialer and related process
07/10/1990US4940296 Plastic housing for telephone paystation
07/03/1990US4938547 Simplified metal housing for telephone paystation
06/1990
06/19/1990US4935956 Automated public phone control for charge and collect billing
06/12/1990US4933966 Method and apparatus for performing an automated collect call
06/12/1990US4933965 Short time validity storage of a billing account number at a local telecommunications station
06/12/1990US4933931 Integrated accounting system
05/1990
05/30/1990CN1042635A Improvements in mobile pay telephone system
05/22/1990US4928299 Coin operated telephone operation monitoring switch mounting arrangement
05/15/1990US4926469 Pay station telephone call routing apparatus
05/15/1990US4926468 Pay station telephone coin box apparatus
05/15/1990US4926458 Low power control apparatus for a coin operated telephone
05/08/1990US4924497 Pay station telephone interface circuits
05/01/1990US4922525 Paystation theft inhibiting circuit
04/1990
04/24/1990US4920562 Automatic generation of billing records at a telephone paystation
04/10/1990US4916733 Pay station telephone call answer supervision apparatus
04/10/1990US4916731 Device to monitor the content and/or duration of the display of advertisements
04/10/1990CA1267581A1 Rotating drum magazine for storing and managing coins in telephone sets or dispensers
03/1990
03/22/1990WO1990003077A1 Improvements in mobile pay telephone system
03/14/1990CN2054599U Continuous coin-dropping device for use-selfcommon telephone
03/06/1990US4907257 Public telephone set
02/1990
02/28/1990EP0166745B1 Fraud prevention in an electronic coin telephone set
02/20/1990US4903294 Low voltage operated coin relay
02/20/1990US4902881 Public document image and voice communications terminal
02/20/1990CA1266127A1 Credit transaction arrangements
02/06/1990US4899371 Coin slot structure for coin call telephone apparatus
01/1990
01/30/1990US4897870 Network implemented pay telephone set
01/24/1990EP0352177A2 Public telephon set
01/23/1990US4896348 Paystation monitor circuit to prevent fraudulent use
01/17/1990CN1038907A Method and apparatus for electronic payphone open switch interval management
01/11/1990WO1990000333A1 Method and apparatus for electronic payphone open switch interval management
01/03/1990EP0349302A2 Method and apparatus for electronic payphone open switch interval management
12/1989
12/27/1989EP0348025A1 Line interface unit
12/26/1989US4890317 Automatic validation of telephone account numbers
12/20/1989EP0346897A2 Integrated accounting system
12/20/1989CN1038194A Low power control apparatus for coin operated telephone
12/06/1989EP0344672A1 Consumer communication and information system
11/1989
11/30/1989WO1989011766A1 Low power control apparatus for a coin operated telephone
11/29/1989EP0343966A2 Low power control apparatus for a coin operated telephone
11/21/1989CA1263197A1 Portable handsets telephone communication system
11/07/1989US4879744 Card-operated telephone
10/1989
10/25/1989CN1036675A Telecommunications apparatus
10/19/1989WO1989010035A1 Apparatus for use with a telephone
10/10/1989US4873721 Device for starting charging in a pay phone
10/04/1989EP0335768A1 Pre-payment information transmission system
09/1989
09/27/1989EP0334408A2 Telephone apparatus with payphone option
09/26/1989US4870679 Repertory telephone dialer with remote billing capability
08/1989
08/29/1989US4862494 Anti-fraud device for use with a coin operated telephone instrument
08/22/1989US4860346 Telephone system and method operated from central office loop current
08/22/1989US4860345 Telephone system and method operated from central office loop current
08/22/1989US4860341 Radiotelephone credit card call approval synchronization
08/22/1989US4860336 Radiotelephone credit card data communications
08/08/1989US4856046 Remote public telephone link
07/1989
07/25/1989US4852155 Systeme d'authentification analogique reciproque entre un terminal et une ligne de transmission
07/04/1989US4845742 Dynamic microphone handset and amplifier unit
07/04/1989US4845740 Radiotelephone system adapted to read a credit card
06/1989
06/20/1989US4841563 Bucket type coin accumulation apparatus
06/15/1989DE3741072A1 Circuit arrangement for detecting an incoming call in a telephone set
06/06/1989US4837815 Armored cord handset
05/1989
05/16/1989US4831650 Adaptive telephone receive control
05/16/1989US4831647 Radiotelephone credit card data communications
04/1989
04/26/1989CN2036729U Coin-operated telephone using the clearing signal of ringing return sound to collect the money
04/25/1989US4825460 Line interface unit for caller-controlled receipt and delivery of voice messages
04/19/1989EP0311607A1 Shared flexible rating of telecommunications calls.
04/11/1989US4821313 Paystation transmitter ground detect circuitry
04/05/1989EP0310475A2 Device to control the contents and the display duration of advertising messages
04/04/1989US4819261 Public telephone set
03/1989
03/21/1989US4815123 Coin-operated telephone apparatus
03/07/1989US4811386 Called party response detecting apparatus
03/01/1989EP0305290A1 Cash collecting device and method
02/1989
02/28/1989US4809319 Coin-operated telephone apparatus
01/1989
01/12/1989WO1989000320A1 Memory card for telephone calls
01/10/1989US4797914 Telephone display
01/10/1989CA1248650A1 Telephone apparatus
12/1988
12/28/1988CN87104288A Operation mode of charge system of crossbar telephone switchboard
12/20/1988CA1247267A1 Short range radiotelephone system having sets each usable simultaneously by several people
11/1988
11/24/1988DE3715580A1 Schaltungsanordnung zur ueberwachung einer fernsprechanschlussleitung Circuit arrangement for ueberwachung an automatic telephone connection cable
11/23/1988EP0292342A1 System for the reciprocal analogous authentication between a terminal and a transmission line
11/01/1988US4782516 Fraud prevention in a public telephone station
10/1988
10/11/1988US4777647 Pay station telephone interface
10/11/1988US4777646 Communication system
10/11/1988US4777644 Method and apparatus for testing telephone coin relays
10/04/1988US4776003 Cellular mobile radio credit card system
10/04/1988US4776000 Telephone communications system with portable handsets
08/1988
08/30/1988US4768227 Coil operated telephone
08/30/1988US4768223 Public telephone set with internal charge processing
08/30/1988US4768222 Control and surveillance system for prepayment public telephone apparatus
08/30/1988US4768217 Public telephone set
08/09/1988CA1240430A1 Telephone apparatus with a fixed telephone station coupled to a mobile and detachable handset
08/02/1988US4761809 Coin return chute for telephone pay station
07/1988
07/26/1988US4760594 Answer supervision detection unit for pay telephone system
07/19/1988US4759054 Toll telephone system and method for maintaining or initiating loop current after resuming on-hook condition
07/19/1988US4759050 Intelligent toll telephone system and method
07/19/1988US4758823 System for protecting a group of locations of a network by anticipating vandalism
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