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 |
| 7912093 | Method and apparatus for providing piggybacked positive acknowledgement/negative acknowledgement field indicator and a polling indicator A method and apparatus of providing a piggybacked positive acknowledgement/negative acknowledgement (ACK/NACK) (PAN) field indicator (PANI) and a polling indicator are disclosed. A combined field of a PANI bit, a relative reserved block period (RRBP) bit and an EGPR... | 03/22/2011 |
| 6891856 | Delay-compensated timeslot assignment method and system for point-to-multipoint communication networks In a communication network, end-user systems are connected via a common transmission medium to a timeslot assignment unit. Each end-user system has a buffer for storing packets, and a queue length detector for detecting a queue length of the stored packets. The end-... | 05/10/2005 |
| 6650658 | Controlled aliasing to simplify service selection A system and method for a handshake protocol for digital subscriber line (DSL) and similar telecommunication systems that makes beneficial use of aliasing to select and decode signaling tones. In particular, the invention carefully selects signaling tones... | 11/18/2003 |
| 6501770 | Dynamic mapping of broadcast resources In a data communication system such as a high capacity DBS system, dynamic mapping of broadcast resources is provided to exploit occasional redundancy in the program content of two or more input data streams, freeing at least one broadcast resource to car... | 12/31/2002 |
| 5734329 | Method and apparatus for superimposing self-clocking multifunctional communications on a static digital signal line A communication system for allowing a master to send commands to one or more slave devices across a normally static digital signal line of a bus. The master includes command logic for asserting a sequence of digital pulses according to a predetermined pro... | 03/31/1998 |
| 5684343 | Data link module for time division multiplexing control systems A programmable data link module (32) for use in a time division multiplexing control system (30) having a plurality of modules interconnected by a bus (40) for passing control signals between data link modules on a serial multiplex basis. Each module incl... | 11/04/1997 |
| 5355390 | Communication apparatus for transmitting and receiving communication signals through common transmission line A transmitting circuit is provided which includes a control circuit for transmitting and receiving a communication signal. Transmit information is modulated into a trapezoidal wave signal using a waveform shaping circuit. A communication signal is first g... | 10/11/1994 |
| 4890112 | Time multiplexed radar link A time multiplexer for linking a trigger signal, a video signal, and data signals generated by a radar transceiver to a radar display. The multiplexer is particularly useful when the transceiver is located remotely from the display, such as is commonly en... | 12/26/1989 |
| 4811021 | Dual polarization transmission system A dual polarization transmission system includes a first circuit for alternately arranging a plurality of channels having a first bandwidth on a first polarized wave and a second polarized wave orthogonal to the first polarized wave on a frequency axis, a... | 03/07/1989 |
| 4680751 | Polarized carrier modulation This invention provides means for controlling the carrier current in an R.F. amplifier whereby the positive and negative excursions of the carrier current are in accordance with separate modulation signals and a receiver for reproducing the separate modul... | 07/14/1987 |
| 4618952 | Communication of unipolar pulses A unipolar pulse communication system exploits the fact that certain computer terminals will react only to information pulses of a specific polarity and remain passive to pulses of the reverse polarity. A device at one end of the system passes pulses unch... | 10/21/1986 |
| 4578538 | Method and apparatus for communicating digital signals over telephone lines A method for effecting the communication of digital signals over telephone lines includes the steps of generating a voltage at a first level for providing an inactive state signal directed to a plurality of slave transceiver units and generating a voltage... | 03/25/1986 |
| 4519067 | Communication system providing amplifier gain by half-cycle carrier signal control A communication system enables a plurality of wide band signals to be carried over a common signal path. Each one of the information channels is used to amplitude modulate selected half-cycles of a common carrier signal. Because successive half-cycles of ... | 05/21/1985 |
| 4411004 | Inductively coupled sensing circuit and priority system An inductively coupled sensing circuit for use on a common cable communications system is disclosed. When used in conjunction with transceivers on a common cable system, the circuit is capable of both detecting signals and determining the direction of any... | 10/18/1983 |
| 4326287 | Two wire bi-directional digital telephone link This invention details a baseband bipolar pulse signaling technique employing only two wires for simultaneous bi-directional communications. A first polarity of pulses is utilized for communication of traffic in one direction; traffic in the return direct... | 04/20/1982 |
| 4320880 | Electronic track current switching relay system An electronic system which emulates the operation of a polar relay for applying coded pulses to railway tracks has separate signaling circuits having signaling devices responsive to a separate inputs which provide operating power to the circuits. The circ... | 03/23/1982 |
| 3974339 | Method of transmitting digital information in a time-division multiplex telecommunication network A method for transmitting digital data in a time-division multiplex telecommunications network over subscriber lines connecting digital subscriber stations to a subscriber concentrator is described. Transfers of data occur over two wire subscriber lines i... | 08/10/1976 |
