| Patents for H04M 15 - Arrangements for metering, time-control or time-indication (14,957) |
|---|
| 01/02/1979 | CA1045706A1 Hotel pbx electronic message billing arrangement |
| 12/12/1978 | CA1044354A1 Paired identifier arrangement for automatic number identification |
| 10/24/1978 | US4122308 Telephone call metering device |
| 10/24/1978 | CA1041200A1 Automatic number identification having four-party detection |
| 10/03/1978 | US4118790 Data processing equipment |
| 09/19/1978 | CA1038951A1 Hotel pbx electronic message billing arrangement |
| 08/15/1978 | CA1036734A1 System for measuring the duration of a telephone call |
| 08/15/1978 | CA1036698A1 Message metering system having multi-level signals and party discrimination |
| 07/04/1978 | US4099031 Method and apparatus for automatically identifying an individual calling party on a multiparty telephone line |
| 06/06/1978 | US4093825 Data transmission system |
| 05/23/1978 | US4091238 Automatic telephone call computer and display |
| 05/16/1978 | US4090034 Usage-sensitive billing arrangement for private branch exchange subscribers |
| 05/09/1978 | US4088839 Telephone call timer |
| 03/14/1978 | US4079205 Automatic number identification device |
| 03/14/1978 | US4079201 Electronic telephone call timer |
| 01/31/1978 | US4071879 Reversible current apparatus |
| 12/27/1977 | US4065640 Apparatus for interconnecting a telephone line and a portable calculator |
| 12/13/1977 | US4063037 Telephone metering interface with reverse signal sensor |
| 11/15/1977 | US4058680 Telephone message timing system |
| 11/01/1977 | US4056690 Automatic number identification in subscriber loop carrier systems |
| 10/18/1977 | US4054942 Tip automatic number identification circuit |
| 10/11/1977 | US4053718 Automatic telephone call generator |
| 08/09/1977 | US4041291 Dollars and cents telephone metering computer |
| 08/02/1977 | US4040023 Recorder transfer arrangement maintaining billing data continuity |
| 07/12/1977 | US4035583 Method to apply and disconnect a 16 KHz signal to a telephone line without producing clicks |
| 06/14/1977 | US4030069 Redundant message metering network |
| 05/31/1977 | US4027104 Arrangement for automatically generating alternate telephone station identification codes |
| 03/22/1977 | US4013839 System for monitoring dialled telephone numbers |
| 03/08/1977 | US4011542 Redundant data transmission system |
| 02/15/1977 | US4008377 Arrangement for registering and reading of message units in telephone exchanges |
| 02/08/1977 | US4007336 Class of call discriminating trunk circuit |
| 01/11/1977 | US4002848 Toll fraud eliminator for telephone systems |
| 01/04/1977 | US4001513 Method and apparatus for the detection of fraudulent toll telephone calls |
| 01/04/1977 | US4001512 Automatic telephone number identification circuit |
| 01/04/1977 | US4001509 Remote office message metering system |
| 12/28/1976 | US4000372 Telephone call amount recorder |
| 11/30/1976 | US3995117 Message billing arrangement for a communication system |
| 09/21/1976 | US3982073 System for measuring the duration of a telephone call |
| 07/20/1976 | US3970793 Telephone-call toll monitor and indicator |
| 07/20/1976 | US3970789 Telephone service control device |
| 06/29/1976 | US3967074 Telephone station identification system |
| 06/08/1976 | US3962548 Direct readout exhibitor for determining long distance telephone charges |
| 05/25/1976 | US3959674 Pulse counters having a magnetic pole wheel |
| 05/25/1976 | US3959598 Identification forwarding circuit for use with tone-to-pulse converters |
| 05/11/1976 | US3956592 Automatic toll ticketing |
| 04/13/1976 | US3950619 Message charge control telephone answering device |
| 03/16/1976 | US3944746 Collecting switching system call data |
| 03/16/1976 | US3944330 Electro-optic device |
| 03/09/1976 | US3943336 Photoelectric scanning systems for reading data appearing in an angular format |
| 03/09/1976 | US3943298 Automatic number identification |
| 03/02/1976 | US3941935 Centralized debiting system for TDM telecommunication network |
| 02/17/1976 | US3939309 Communication switching system data retrieval and loading arrangement |
| 02/10/1976 | US3937894 Addressable ticketing scanner |
| 02/03/1976 | US3936608 Multimetering for telephone switching systems |
| 01/20/1976 | US3934240 Timer for telephone toll calls and the like |
| 01/20/1976 | US3934090 Telephone message timing system |
| 01/06/1976 | US3931471 Electronic metering arrangement for use in telephone and like exchanges |