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Larry C Puhl, Richard A Comroe, Robert W Furtaw, Tracey L Cantarutti: Portable authentification system. Motorola, Jon P Christensen, July 14, 1992: US05131038 (272 worldwide citation)

A personal identity authentification system is provided in which parametric data of an authorized possessor is encrypted into a memory of a portable transceiver device. The portable transceiver device, carried by a possessor, may be activated by an identity request transmitted from a nearby, authori ...


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Mary B Flanders, Louis D Finkelstein, Larry C Puhl: Method and apparatus for authenication and protection of subscribers in telecommunication systems. Motorola, Shawn B Dempster, August 24, 1993: US05239294 (203 worldwide citation)

Radio frequency based cellular telecommuication systems often require a subscriber (10) to maintain a proprietary identifier (19) or serial number (18) which is transmitted to a fixed network communication unit (20) to verify the authenticity of the subscriber (10). An enciphering and call sequencin ...


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Ronald J Webb, Larry C Puhl: Method and apparatus for assigning duplex radio channels and scanning duplex radio channels assigned to mobile and portable radio telephones in a cellular radiotelephone communications system. Motorola, Rollan R Hackbart, Edward M Roney, James W Gillman, November 27, 1984: US04485486 (163 worldwide citation)

A unique method and apparatus for efficiently assigning duplex radio channels and scanning duplex radio channels assigned to mobile and portable radiotelephones in a cellular communications system is described. Each cell includes a base station radio having a signalling channel and a plurality of vo ...


5
Stephen N Levine, Larry C Puhl, Harry M Bliss, Gerald E Corrigan: Bit synchronization method for a digital radio telephone system. Motorola, Douglas A Boehm, Charles L Warren, Donald B Southard, February 7, 1989: US04803726 (123 worldwide citation)

A method and means for maintaining continuous bit synchronization of data transmitted from a remote unit through a base unit to a landline unit is disclosed. An input data stream at a first bit rate, such as digitized or encrypted speech, is interleaved with a plurality of signalling words, and tran ...


6
Larry C Puhl: Microprocessor with duplicate registers for processing interrupts. Motorola, Rolland R Hackbart, James W Gillman, February 28, 1984: US04434461 (117 worldwide citation)

A unique microprocessor for controlling portable and mobile cellular radiotelephones is architectured to process high speed supervisory signalling, while also minimizing power drain. The architecture of the microprocessor is organized around three buses, a data bus, a register bus and an address bus ...


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Larry C Puhl, Richard J Vilmur: Full duplex speakerphone for radio and landline telephones. Motorola, Rolland R Hackbart, Raymond A Jenski, December 16, 1986: US04629829 (97 worldwide citation)

A full duplex speakerphone employing adaptive filters and having application in radiotelephone systems is disclosed. To cancel acoustic feedback echo of the receive signal, a representation of the receive signal is subtracted from the transmit signal generated by the speakerphone microphone. The ada ...


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Louis D Finkelstein, Daniel P Brown, Larry C Puhl: Method for key management of point-to-point communications. Motorola, Anthony G Sitko, April 25, 1995: US05410602 (95 worldwide citation)

A method of secure key distribution in a communication system having a plurality of subscriber units and an infrastructure communication center is provided. A first subscriber unit sends a request to the infrastructure communication center for a secure communication link with a second subscriber uni ...


9
Larry C Puhl, John F Smedinghoff: Microprocessor controlled radiotelephone transceiver. Motorola, Rolland R Hackbart, Edward M Roney, James W Gillman, December 4, 1984: US04486624 (88 worldwide citation)

An improved radiotelephone includes a unique microprocessor and peripheral devices for controlling the operation of portable or mobile radio transceivers in a cellular-type radiotelephone system. The microprocessor is coupled by a data interface unit and synchronization unit to the radio transceiver ...


10
Ezzat A Dabbish, Larry C Puhl, William L Brendle: Programmable array logic self-checking system. Motorola, Timothy W Markison, Steven G Parmelee, Joseph P Krause, February 18, 1992: US05090015 (65 worldwide citation)

A self checking electronically erasable programmable array logic (EEPAL) that comprises an input receiver, a programmable array, an error detection code storage array, an error detection circuitry, and error signalling circuitry is disclosed. The self checking EEPAL verifies the storage integrity of ...



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