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| Number | Title | Issue Date |
| 4641127 | Security and fire protection system A plurality of smoke (or heat) detector-transmitter units (17, 19) and/or a plurality of intrusion detector-transmitter units (21) are mounted at various positions throughout a premises to be protected (11a, 11b, 11c . . . ). The units are wireless and tr... | 02/03/1987 |
| 4580012 | Electronic audio communications system with automatic user access features An advanced electronic telecommunications system is provided for the deposit, storage and delivery of audio messages to both subscribers and non-subscribers with limited access provided to the non-subscriber under the control of the subscriber. A Voice Me... | 04/01/1986 |
| 4567323 | Method and apparatus for providing a plurality of special services For use with a telephone system serving a plurality of stations, method and apparatus is disclosed for providing a plurality of special services by designating a memory dedicated to a particular station for a selected one of the services on a per call bas... | 01/28/1986 |
| 4322581 | Multifunction telephone with message information and control information circuits for connecting stations and common equipment in a telephone network A private telephone network that includes multifunction telephones. Multifunction telephones are connected to common equipment by a voice signal path and a data signal path. Supervisory information passes over the data signal path in the form of polled me... | 03/30/1982 |
| 4302632 | Digitally-controlled telephone answering switching system A digitally controlled telephone answering switching system is disclosed which can economically and efficiently serve a large number of subscribers over a vast geographic area. The system utilizes a plurality of remote sites each of which is adjacent to a... | 11/24/1981 |
| 4289932 | Conferencing communications system A telephone conferencing system in which all input signals are twice applied to a circulating signal loop firstly in real time and secondly delayed by an interval equal to the delay of the circulating loop. The delayed signal cancels the first applied sig... | 09/15/1981 |
| 4278849 | Test arrangement for automatic number identification systems A testing arrangement for automatic number identification apparatus is disclosed in a step-by-step telephone system. The "M" leads which apply identification tones to the sleeves of calling lines are periodically scanned for trouble conditions. If an "M" ... | 07/14/1981 |
| 4277649 | Method and apparatus for screening telephone calls A telephone system is disclosed for providing customized telephone services. A called customer can screen calls incoming to his station based on the identity of the calling line. The calling line's identity is forwarded to the switching office containing ... | 07/07/1981 |
| 4246442 | Method and device for confirming correct connection between data terminals in data communication system using telephone network In a system of transceivers which can automatically operate either in calling or called modes, the identification codes of the calling and called transceivers are transmitted back and forth between them and compared in a manner which tends to minimize err... | 01/20/1981 |
| 4224477 | Arrangement for translating telephone station equipment numbers into directory numbers The invention is a method and structure for use in a telephone office to translate equipment numbers of prescribed stations served by the office into their associated directory numbers. The method comprises the steps of scanning terminating calls in the o... | 09/23/1980 |
| 4215243 | Automatic modem identification system Apparatus for communicating between a number of remote use terminals and a central computer. The apparatus initially answers an incoming call under concentrator control, and transmits an answer tone to the calling terminal. The terminal user places the mo... | 07/29/1980 |
| 4139745 | Telephone line test system A computer controlled system for the diagnostic testing of two wire telephone lines. The system comprises a control means having a programmed digital computer and associated memory, a line test network, a user station and an interface for interconnecting ... | 02/13/1979 |
| 4117270 | Telephone answering and call diverting system A telephone answering and call diverting system including a call diverter for sensing an incoming call on a first line and in response dialing a preset telephone number and transmitting a preset identification code both on a second line, for connecting th... | 09/26/1978 |
| 4087638 | DTMF Communication system A highly flexible and economical dual tone multiple frequency (DTMF) communication system includes a data input source such as a keyboard; a repertory dialer or electronic memory; an integratable digital encoder which includes a digital sine wave synthesi... | 05/02/1978 |
| 4059733 | Call distributor for increasing switching system call termination rate A system and methods are disclosed in which two telephone calls are terminated simultaneously provided that one call is a local call and the second call is a trunk call and further provided that the local call and trunk call originate in separate line uni... | 11/22/1977 |
| 4039758 | Line identifying system of common control type automatic exchange A line identifying system for an automatic switching system of the common control type employs a line identifier adapted to be connected to any of a plurality of switch frames through a connector, which cuts off the operating circuit for a connector relay... | 08/02/1977 |
| 4013843 | Marker for extending calls to remote junctions in a telecommunications system A marker designed to control a switching circuit for extending an outgoing call to a remote junction, identified by a characteristic digit or digit combination at the beginning of a call number emitted by a local subscriber, includes a first and a second ... | 03/22/1977 |
| 4001513 | Method and apparatus for the detection of fraudulent toll telephone calls Fraudulent toll telephone calls are detected by the recognition of extraneous supervisory signals which are generated in the originating office in response to a perpetrator placing such a call. The invention provides a means of detecting a second proceed-... | 01/04/1977 |
| 3975596 | Trunk consultation arrangement An arrangement is disclosed for providing trunk consultation in an electronic private automatic branch exchange which is built around a space divided solid state matrix. The trunk consultation arrangement is enabled by a hookswitch flash from a consulting... | 08/17/1976 |
| 3974343 | Small modular communications switching system with distributed programmable control A telephone central office switching system with economical application to small community dial office sizes is disclosed. Communication paths are spatially switched over a modular network fabric comprised of electromechanically actuated metallic crosspoi... | 08/10/1976 |
| 3967071 | Switching system of stored program control type A telephone switching system of the stored program control type comprising a calling line identifier for identifying the position of a calling subscriber on the switching network and a called line busy status detector for detecting the free or busy status... | 06/29/1976 |
| 3963872 | Non-symmetric folded four-stage switching network A telephone central office switching system including a non-symmetric four stage (ABC+D) folded network and junctor circuits whereby a communication path is established from a calling terminal over the four stage network, through a junctor circuit, and ba... | 06/15/1976 |
| 3936615 | Trunk transfer circuit A circuit is disclosed for providing trunk transfer in an electronic private automatic branch exchange which is built around a space divided solid state matrix. The trunk transfer circuit is enabled by a hookswitch flash from a transferring PABX station c... | 02/03/1976 |
| 3935394 | Network routing and control arrangement A system is disclosed for selecting and establishing connections through a two-stage concentrator network utilizing path selection circuitry adapted to minimize blocking. This circuitry operates to select a path through the second-stage switch which is th... | 01/27/1976 |
