1
Martin E Hellman, Bailey W Diffie, Ralph C Merkle: Cryptographic apparatus and method. Stanford University, Flehr Hohbach Test, April 29, 1980: US04200770 (891 worldwide citation)

A cryptographic system transmits a computationally secure cryptogram over an insecure communication channel without prearrangement of a cipher key. A secure cipher key is generated by the conversers from transformations of exchanged transformed signals. The conversers each possess a secret signal an ...


2
Atul D Ayer, Felix Theeuwes: Osmotic system with distribution zone for dispensing beneficial agent. Alza Corporation, Paul L Sabatine, Thomas E Ciotti, Edward L Mandell, April 29, 1980: US04200098 (415 worldwide citation)

An osmotic system is disclosed for dispensing a beneficial agent. The system comprises (1) a first wall of a semipermeable material that surrounds a compartment containing a drug formulation, and has a passageway through the wall for releasing agent from the compartment, (2) a second wall positioned ...


3
John I Peterson, Seth R Goldstein: Fiber optic pH probe. United States of America, Holman & Stern, April 29, 1980: US04200110 (288 worldwide citation)

A fiber optic pH probe suitable to be implanted in tissue for physiological studies is disclosed. The probe includes an ion permeable membrane envelope which encloses the ends of a pair of optical fibers. A pH sensitive dye indicator composition is present within the envelope. The probe operates on ...


4
Renato Malvano, Marco Omini, Natalino Carli: Liquid crystal mirror for use as a rear-view mirror for vehicles. Fiat Societa per Azioni, Sughrue Rothwell Mion Zinn and Macpeak, April 29, 1980: US04200361 (272 worldwide citation)

A rear-view mirror for motor vehicles incorporates a liquid crystal film sandwiched between front and rear transparent electrode surfaces, the rear electrode surface being in the form of a lattice or net having a number of clear areas through which light passes unattenuated when the cell is activate ...


5
Frank W Harris: Contact area measurement apparatus for use in electrosurgery. Valleylab, Gerald J Ferguson Jr, Joseph J Baker, April 29, 1980: US04200104 (268 worldwide citation)

Patient contact area measurement method and apparatus including a first electroconductive contact element adapted for contact with the patient; a second electroconductive contact element separated from the first contact element and also adapted for contact with the patient; and measuring circuitry d ...


6
Jeffrey F Hughes, John S Liptay, James W Rymarczyk, Stanley E Stone: Multi-instruction stream branch processing mechanism. International Business Machines Corporation, Robert W Berray, April 29, 1980: US04200927 (207 worldwide citation)

In a high-performance computer which prefetches and predecodes instructions for sequential presentation to an execution unit, at least three separately gated and sequenced multi-instruction buffers for prefetched instructions permit continued sequential predecoding and buffering of instructions from ...


7
Nicholas G Douvas, Henry T Dinkelkamp: Fixed arc cyclic ophthalmic surgical instrument. Harness Dickey & Pierce, April 29, 1980: US04200106 (187 worldwide citation)

A fixed arc cyclic cutter-extractor and handpiece assembly for use in ophthalmic microsurgery incorporates a tubular cutter tip having a closed outer end and a lateral orifice therethrough in close proximity to the end. The periphery of the orifice defines a cutting edge for cooperation with a cutte ...


8
Eugene Kuhar, Donald L Smith: Operator controlled programmable keyboard apparatus. International Business Machines Corporation, John C Black, April 29, 1980: US04200913 (179 worldwide citation)

A cathode ray tube (CRT) and keyboard display terminal are operated in accordance with the program routines of a microcontroller. The microcontroller includes a random access store which is loadable by the customer during initial program load (IPL) operation to store customer selected program routin ...


9
David C Campbell, David R Thompson: Appliance control. Pico Electronics, Gajarsa Liss & Conroy, April 29, 1980: US04200862 (168 worldwide citation)

An applicance control system comprises a data transmitter and plurality of slave units plugged into outlet sockets of a power main of a building, appliances being coupled to the slave units. The transmitter housing includes a data input arrangement by which slave unit addresses and operation signal ...


10
Elmer D Hill: System and method for painting images by synthetic color signal generation and control. Townsend and Townsend, April 29, 1980: US04200867 (149 worldwide citation)

Color video images are remotely painted on the screen of a conventional color television receiver or a video monitor utilizing electronic color image storage means in a control device. The control device comprises a manual input unit, an image or picture element memory, a palette or color memory con ...