Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 5566301 | ISDN audiovisual teleservices interface subsystem The technical field of the invention generally concerns systems for audiovisual teleservices using digital telecommunication services such as Integrated Services Digital Network ("ISDN") communications. In the preferred embodiment, an interface subsystem ... | 10/15/1996 |
| 5555263 | Method and apparatus for reducing switching oscillations in an ISDN line interface circuit A method and apparatus for limiting switching oscillations on an ISDN line interface circuit may be accomplished by sensing the current provided to the primary winding of the line coupling transformer (14). When the primary current is in a first pre-deter... | 09/10/1996 |
| 5541982 | Device for transmitting video and audio signals through an integrated services digital network Transmission of video and audio signals through an integrated services digital network by low-cost means is carried out by a device in the form of a terminal adapter (TA-TV) to which conventional picture and sound recording devices (CAM) and picture and s... | 07/30/1996 |
| 5509065 | Dual span monitoring system for maintenance shelf control A telecommunication system is described that has an interface and multiple lines, such as T-1 lines. The multiple lines include at least one service line and at least one spare line. The interface comprises a bus across the service line and spare line and... | 04/16/1996 |
| 5481605 | Private branch exchange capable of analyzing information received from ISDN A method of deciding whether an extension terminal is called or not is provided. The kind of communication is recognized on the basis of a set-up message received from the ISDN. Whether the extension terminal is called or not is decided on the basis of th... | 01/02/1996 |
| 5481598 | Subscriber terminal for ISDN networks A subscriber terminal for ISDN networks in the form of an ISDN telephone (11) is equipped with a keyboard (15,16), a display (14) and a connection socket (19) for another applications terminal (21-24), such as a printer and/or a keyboard and/or a computer... | 01/02/1996 |
| 5479510 | Automated data card payment verification method A method of data transmission over existing telephone lines and later verification of that transmission includes electronic payment verification using telephone transmission of payment information and return transmission of a unique card account number, s... | 12/26/1995 |
| 5459788 | Apparatus for interfacing analog telephone in ISDN terminal adapter An apparatus for interfacing an analog telephone in an ISDN terminal adapter is able to independently perform call set-up regardless of a personal computer's operation, while being provided with ISDN audio service via an existing analog telephone. The app... | 10/17/1995 |
| 5450486 | Telecommunication system and a linecard Telecommunication systems such as PABXs are known which comprise ISDN digital linecards with a number of ISDN basic access interfaces. A telecommunication device is proposed comprising configurable ISDN digital linecards. To this end the linecards are pro... | 09/12/1995 |
| 5448635 | Wiring scheme and network adapter with digital and analog outputs to allow old pots coexistence with ISDN A network adapter and wiring scheme makes use of existing plain old telephone service (POTS) wiring to provide support between analog devices within the subscriber premise and an Integrated Digital Service Network (ISDN). Moreover, the network adapter and... | 09/05/1995 |
| 5426692 | Communication terminal and the method using the same A communication terminal having an interface to which its components including an analog telephone are connected and which enables communication with another terminal at the other end of a line of the integrated services digital network. A first tone is g... | 06/20/1995 |
| 5418840 | Device and method for telephone interconnections for a communications network with independent stations A specific module of a communications network comprises (i) first and second telephone interface mechanisms respectively connected to telephone channels, (ii) interconnection mechanisms between these first and second interfaces, and (iii) a processing mec... | 05/23/1995 |
| 5349640 | Option bus adapter A method and apparatus for connecting a programmable computing device to a digital telephone via an adapter. The digital telephone includes an option bay connection, having a hierarchical control protocol. The option bay connection makes available several... | 09/20/1994 |
| 5333182 | Arbitrary selecting of a terminal to be called in key telephone systems A key telephone system is disclosed including a key service unit to which are connected a communication network such as public telephone network, a plurality of data terminal equipments such as personal computers, and interface conversion unit such as MOD... | 07/26/1994 |
| 5319700 | Terminal adapter pooling system for ISDN In a key telephone system in which a plurality of data terminals 37l . . . 37n such as personal computers are connected to a key service unit 1 connected to a plurality of ISDNs 23l . . . 23m, a terminal adapter (TA) 41 is pooled so as to be usable in com... | 06/07/1994 |
| 5317630 | Interface for a data telephone and data terminal in a digital telephone system A data terminal interface for a terminal adapter and an attached computer provides complete flexibility and control of information in a communication environment for a user. Communications between the terminal adapter and a digital network may be provided... | 05/31/1994 |
| 5305312 | Apparatus for interfacing analog telephones and digital data terminals to an ISDN line An interface to an integrated service, digital network (ISDN) line for up to two analog dual tone, multifrequency telephones and up to four personal computers or data terminals. A stored program-controlled processor controls access to the ISDN line for th... | 04/19/1994 |
| 5283829 | System and method for paying bills electronically An electronic bill payment system and method include billing equipment for creating approval records and generating approval numbers for each pre-authorized subscriber. The system also includes an interactive payment approval apparatus into which subscrib... | 02/01/1994 |
| 5267245 | ISDN communication control unit and control method A communication control unit for integrated service digital network (ISDN) is disclosed. The ISDN communication control unit includes a data communication adapter for transmitting and receiving data to and from the ISDN and a voice adapter for transmittin... | 11/30/1993 |
| 5173934 | Communications adaptor for a remote action terminal A communications adaptor for a remote action terminal connected to a telephone line in parallel with a telephone set in order to interchange remote action data with at least one server via the telephone line and a remote action network to which the server... | 12/22/1992 |
| 5150402 | ISDN terminal having diagnostic function An ISDN terminal adapter having a diagnostic function includes a terminal adapter section, an S/T pointer interface section, a D channel control section, a sub-address identifying section, and a remote monitor section. The terminal adapter section has a d... | 09/22/1992 |
| 5142568 | Data communication apparatus which can use either an analog or a digital line A data communication apparatus includes an analog communication unit for performing analog communication, an A/D converter for converting the analog signal from the analog communication unit into a digital voice signal, and an ISDN communication control u... | 08/25/1992 |
| 5113396 | Interface for ISDN channels A line interface for ISDN channels converts an analog signed from an analog communication terminal to digital data and sends the converted digital data to a B-channel of ISDN. The digital data from the B-channel of ISDN is converted to an analog signal an... | 05/12/1992 |
| 5062104 | Digital service unit for connecting data processing equipment to a telephone system based computer network An apparatus for coupling data processing equipment to subscriber loops in a telephone system based computer network is disclosed. The multipoint communication network includes a plurality of network units with at least two of the network units comprising... | 10/29/1991 |
| 5042028 | Communication terminal device A communication terminal device connected to a communication network via a plurality of information channels used for transfer of information such as line switching information or packet switching information and a signal channel used for control of calli... | 08/20/1991 |
| 5023868 | Automated call handling apparatus A computer connected to an ISDN switch via an ISDN digital subscriber line, has shared cell appearances with a number of telephone stations connected to the switch and on the basis of shared call appearance associated messages from the switch, controls th... | 06/11/1991 |
| 5014315 | Digital telephone system A digital telephone system, having a through-switching module connected by its inputs/outputs to "1" subscriber concentration modules, each with group subscriber inputs/outputs connected via remote subscriber modules to groups of telephone sets. The telep... | 05/07/1991 |
| 4922534 | Intelligent synchronous modem and communication system incorporating the same An intelligent synchronous modem and data communication systems utilizing the intelligent synchronous modem are provided. The modem comprises: at least one connector having a first and a second port for primary and secondary channels of communication with... | 05/01/1990 |
| 4903292 | System for transmitting low frequency tones through a digital loop carrier system A system for use in a digital loop carrier (DLC) which allows low frequency (sub-audible) tones such as those used with alarm systems to be transmitted from one end of the DLC to the other end even though the DLC has been designed to reject signasl below ... | 02/20/1990 |
| 4901344 | Telephone system digital channel bank interface 8 kHz ASK signals are produced by an electronic business set instrument to function as control or feature signals. To avoid the problems of transmitting the 8 kHz ASK over voiceband telephone lines over long distance, the least significant bit (LSB) of ea... | 02/13/1990 |
| 4754455 | Telephone signal transmission device A telephone signal transmission device capable of transmitting and receiving dial pulses in a network system which includes a telephone exchange is disclosed. Transitions of a connection signal are detected to allow a connection signal to be transmitted o... | 06/28/1988 |
| 4724521 | Method for operating a local terminal to execute a downloaded application program The present invention provides methods for operating a local terminal which includes a programmable computer so that the terminal executes a pre-arranged application program. More specifically, the present invention provides methods for operating a local ... | 02/09/1988 |
| 4479123 | Automatic Calling Unit control system In a data communications system where a plurality of line adapters connect to remote peripheral units there is provided a control system for controlling selected Automatic Calling Units which can dial connection lines to remote peripherals or systems. A m... | 10/23/1984 |
| 4440987 | Computer and peripheral interface circuit An interface circuit is disclosed for connecting a digital computer to a modem or other peripheral circuit through either a standard digital signal (RS232) "port" or an audio-frequency "port" normally used by the computer to store and retrieve information... | 04/03/1984 |
| 4413240 | Automatic line buildout circuit for digital data transmission There is disclosed an automatic line buildout circuit which includes in its signal path two variable filters, each implemented by a transconductance operational amplifier circuit. Each filter exhibits a transfer function pole with a frequency which is dir... | 11/01/1983 |
| 4394757 | Frame format for PCM speech data in a telephone transmission system and digital telephone apparatus for use with this frame format A frame format for PCM speech data in a telphone transmission system and a digital telephone apparatus for use with this frame format are disclosed. The frame format includes a superframe formed of 32 data frames, each comprising three 8 bit data words (b... | 07/19/1983 |
| 4346259 | Low speed terminal interface for all-digital PABX An interface for synchronizing the output of standard asynchronous terminals with a PABX allows all terminals to operate asynchronously with respect to each other. The output from the I/O terminal, which comprises a binary data stream in an asynchronous c... | 08/24/1982 |
| 4345115 | Telephone line interface A telephone subscriber's line interface for a system in which the telephone instrument and the connections therefrom to the exchange use analogue, while the exchange is digital is described, in which electro-mechanical components are eliminated. To achiev... | 08/17/1982 |
| 3983323 | Full-duplex digital transmission line system A finite drive impedance, unbalanced transmission line system for transmitting only the differentiated transitions of a binary level digital signal is disclosed. The transmission line arrangement includes two identical, balanced-bridge transceivers at opp... | 09/28/1976 |
