61
Robert I Bernstein: Tripolar catheter apparatus. Electro Catheter Corporation, Hubbell Cohen Stiefel & Gross, September 15, 1981: US04289134 (51 worldwide citation)

A tripolar catheter apparatus employing an automatic electronic switch is adapted for use with a conventional bipolar demand cardiac pacer for converting a bipolar pacing system into a tripolar pacing system in which stimulation can be applied between two intra-ventricular electrodes, such as ones l ...


62
David H Malcolm: Spray gun having self-contained low voltage and high voltage power supplies. Speeflo Manufacturing Corporation, Pearne Gordon Sessions McCoy & Granger, September 15, 1981: US04290091 (51 worldwide citation)

An electrostatic spray gun apparatus for coating systems having an entirely self-contained light weight electrical power supply adapted to convert the kinetic energy available in a moving air stream into the required high d.c. potential and which dispenses with external electrical supply connections ...


63
Elroy M Gladrow, William E Winter: Hydrocarbon cracking with mixture of zeolites Y and ZSM-5. Exxon Research & Engineering Co, Marthe L Gibbons, September 15, 1981: US04289606 (50 worldwide citation)

A hydrocarbon cracking catalyst comprises an ultrastable Y-type crystalline zeolite, a small pore crystalline ZSM-type zeolite, an inorganic oxide matrix and, optionally, a porous inert component. The cracking catalyst has a high activity and selectivity for the production of high octane naphtha fra ...


64
Thomas N Claytor: Method and means of passive detection of leaks in buried pipes. The United States of America represented by the United States Department of Energy, Donald P Reynolds, Frank H Jackson, Richard G Besha, September 15, 1981: US04289019 (50 worldwide citation)

A method and means for passive detection of a leak in a buried pipe containing fluid under pressure includes a plurality of acoustic detectors that are placed in contact with the pipe. Noise produced by the leak is detected by the detectors, and the detected signals are correlated to locate the leak ...


65
Roger D Bates, Gordon R Knight: Self-synchronizing clock source for optical memories. Xerox Corporation, September 15, 1981: US04290122 (50 worldwide citation)

Periodic clock pulses are pre-recorded on each servo track of an optical disk to provide a local self-synchronizing source of clock frequency information for read only or direct read after write optical digital disk memories. In keeping with accepted practices, the servo track or tracks additionally ...


66
Ram S Ronen: High voltage MOSFET with inter-device isolation structure. Xerox Corporation, September 15, 1981: US04290077 (49 worldwide citation)

Integrated monolithic arrays of high voltage metal oxide semiconductor field effect transistors having closed geometry grounded peripheries for inter-device isolation are able to function as drivers that may be switched on and off. The HVMOSFET includes DMOS-like structures with separate channel and ...


67
Norman J Bourgeois: Collapsible protective cover mechanism. Gunn Lee & Jackson, September 15, 1981: US04289346 (49 worldwide citation)

A collapsible and extendable protective cover mechanism for storage areas includes a pair of elongated guide tracks positioned in parallel relation on either side of the area to be protected. A plurality of cover segments, each having side portions interconnected by a top portion are positioned with ...


68
James L Rodgers: Graphic communication apparatus. Kurta Corporation, H Gordon Shields, September 15, 1981: US04289927 (46 worldwide citation)

Graphic communication apparatus for electronically writing information and transmitting includes a pen having a pair of windings disposed in a predetermined angular relation with respect to each other, and a writing surface having a plurality of windings arranged substantially parallel to each other ...


69
Donald P Smith: Microwave treatment of food products. Gerald G Crutsinger, John F Booth, Harry C Post III, September 15, 1981: US04289792 (46 worldwide citation)

Directed jets of temperature controlled gaseous fluids are applied to irregularly shaped products, such as food portions, to subject discrete areas of the surface to a very high heat transfer rate and to cause these areas to be passed over surfaces of the product at a proper rate to obtain over-all ...


70
Elden D Traster: Video display terminal having means for altering data words. Harris Data Communications, Yount & Tarolli, September 15, 1981: US04290063 (45 worldwide citation)

A video display terminal is disclosed for use in displaying images of data characters on a display screen. Multi-bit coded data words are supplied by a data source, such as a memory, to a character generator circuit which controls the display of data characters on the face of a video display screen. ...