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Amos R Mansfield Jr, Douglas H Marman: Highly reliable power line communications system. General Electric Company, Karl A Vick, Stoel Rivas, August 27, 2002: US06441723 (315 worldwide citation)

An electric power line communication system operates with an electric power distribution system to provide through premises power distribution lines highly reliable communication links among receiving devices electrically coupled or located in proximity to the premises power distribution lines. A po ...


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Amos Robbins Mansfield, Douglas H Marman: Power line communication system with system member identification. GE Security, Klarquist Sparkman, March 4, 2008: US07339466 (177 worldwide citation)

An electric power line communication system operates with an electric power distribution system to provide, via premises power distribution lines, communication links among power line communication devices associated with the premises power distribution lines. A sensor unit and a first communication ...


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Brian A Bernal, Robert G Fischette, Kirk R Johnson, Douglas H Marman: Smoke detector system with self-diagnostic capabilities and replaceable smoke intake canopy. Sentrol, Stoel Rives, August 13, 1996: US05546074 (44 worldwide citation)

A self-contained smoke detector system has internal self-diagnostic capabilities and accepts a replacement smoke intake canopy (14) without a need for recalibration. The system includes a microprocessor-based self-diagnostic circuit (200) that periodically checks sensitivity of the optical sensor el ...


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Brian A Bernal, Daniel P Croft, Kirk R Johnson, Douglas H Marman, Mark A Peltier: Self-adjusting smoke detector with self-diagnostic capabilities. SLC Technologies, Stoel Rives, August 25, 1998: US05798701 (41 worldwide citation)

A smoke detector (10) has internal self-adjustment and self-diagnostic capabilities. It includes a microprocessor-based alarm control circuit (24) that periodically checks the sensitivity of a smoke sensing element (20) to a smoke level in a spatial region (12). The alarm control circuit and the smo ...


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Douglas H Marman, Mark A Peltier, Jacob Y Wong: Fire and smoke detection and control system. Stoles Rives, August 31, 1999: US05945924 (38 worldwide citation)

A fire detection system combines a CO.sub.2 gas detector with a smoke detector. Logic circuitry combines the outputs of both detectors to minimize false alarms and provide a rapid response time. In a preferred embodiment the need for periodic cleaning is reduced. In a further preferred embodiment, t ...


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Amos R Mansfield Jr, Douglas H Marman: Fire system implemented with power line communications. General Electric Company, Stoel Rives, November 23, 2004: US06822555 (35 worldwide citation)

An electric power line communication system operates with an electric power distribution system to provide through premises power distribution lines highly reliable communication links among receiving devices electrically coupled or located in proximity to the premises power distribution lines. A po ...


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Douglas H Marman: Local verification systems and methods for security monitoring. VideoIQ, Stoel Rives, March 17, 2009: US07504942 (29 worldwide citation)

A security monitoring system for reducing the number of false alarms through verification comprises a remote system at a first location remote from a second location and a local system located at the second location. The remote system comprises a remote database. The local system is electronically l ...


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Mark A Peltier, Douglas H Marman, Brent T Krieger: Sensitivity fault indication technique implemented in smoke detector system with self-diagnostic capabilities. Sentrol, Stoel Rives, January 13, 1998: US05708414 (27 worldwide citation)

Self-contained smoke detector systems each have internal self-diagnostic capabilities and function as components of an automatic fire alarm communication system implemented with a conventional two-wire alarm initiating circuit. Each system includes a microprocessor-based self-diagnostic circuit that ...


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William E Abel, Douglas H Marman: Self-powered sensor for use in closed-loop security system. Sentrol, Chernoff Vilhauer McClung & Stenzel, May 17, 1988: US04745398 (27 worldwide citation)

A self-powered sensor for a closed-loop security system includes a self-powered sensor network which provides a switch-actuating signal upon the detection of a physical condition. An electronic switch, which is in a normally closed position, is connected between the positive and negative poles of a ...