Allan A Dudash, Waymon A Melvin Jr, Leonard C Vercellotti: Distribution network communication system having branch connected repeaters. Westinghouse Electric, R W Smith, February 10, 1981: US04250489 (300 worldwide citation)

Bidirectional addressable repeaters of a power line carrier communication system each include an address recognition and a receive and transmit control logic circuit having programmable zone and address identifying states for connection in plural repeating levels defining branch paths linking a cent ...

Ruel C Terry: Generating electricity from coal in situ. In Situ Technology, February 10, 1981: US04250230 (266 worldwide citation)

The system of the invention comprises a two well system of gasifying coal in situ wherein the generated gas stream is directed to a gas separator, which, in turn separates hydrogen and carbon monoxide into separate streams. Hydrogen is directed to one type of fuel cell and carbon dioxide is directed ...

Adrian Weissman: Motor braking arrangement and method. The Singer Company, David L Davis, Robert E Smith, Edward L Bell, February 10, 1981: US04250436 (236 worldwide citation)

A universal series motor having its brushes shifted at an angle against the direction of rotation is provided with a braking arrangement which removes power from the field windings and applies power directly to the armature winding.

Hiroji Kitagawa: Clamping device for cables and the like. Kitagawa, Armstrong Nikaido Marmelstein & Kubovcik, February 10, 1981: US04250348 (185 worldwide citation)

A locking device is disclosed, which comprises a hollow cylindrical body having a plurality of annularly disposed independent gripping pieces projected from one end thereof and a clamping pipe threadably engageable about the outer periphery of the cylindrical body about its side of the gripping piec ...


Nobuo Sasaki, Moto o Nakano, Yasuo Kobayashi, Takashi Iwai: Semiconductor memory device. Fujitsu, Staas and Halsey, February 10, 1981: US04250569 (128 worldwide citation)

Disclosed is a semiconductor memory device using semiconductor memory elements as memory cells. Each semiconductor memory element is provided with a semiconductor region having a particular conductivity type, a source region and a drain region both having opposite conductivity type and both being lo ...

David I Wright: Video signal dropout compensator. RCA Corporation, Eugene M Whitacre, William H Meagher, Scott J Stevens, February 10, 1981: US04250521 (125 worldwide citation)

A video signal dropout compensator stores information from at least one incoming television line which is represented by a plurality of samples of combined liminance and chrominance signal components. The samples occur at a rate equal to four times the chrominance subcarrier frequency. When a signal ...

Eugene B Davis: Warm water dental syringe. A Dec, Klarquist Sparkman Campbell Leigh Hall & Whinston, February 10, 1981: US04249899 (122 worldwide citation)

The specification discloses a dental syringe with a tubular handle adapted to pre-heat water before it is delivered through the syringe tip into a patient's mouth. Water and air supply hoses are connected to the handle, and electric heater and thermostat elements are mounted within the handle for ma ...

Jorge Heller, Richard W Baker: Bioerodible system for delivering drug manufactured from poly(carboxylic acid). Alza Corporation, Paul L Sabatine, Thomas E Ciotti, Edward L Mandell, February 10, 1981: US04249531 (117 worldwide citation)

A device for the controlled continuous administration of an active agent to an environment of use is disclosed. The device comprises a body of erodible agent release rate controlling material containing an agent dispersed therethrough; the rate controlling material is a hydrophobic poly(carboxylic a ...

George D Margolin, Victor V Vurpillat: Automatic money handling device. Auto Register, David S Woronoff, February 10, 1981: US04249552 (116 worldwide citation)

An automatic money handling device for receiving bills and coins and for dispensing bills and coins as change. The device has a storage reel, first and second bill belts extending from a first and supply reels around a first and second entrance rollers at an opening to the housing then to the storag ...