1
Paul K Severson: Micro-programmable security system. Interactive Technologies, Douglas L Tschida, August 21, 1990: US04951029 (243 worldwide citation)

A security alarm network including a plurality of microprocessor-based, subscriber system controllers, wherein each controller is capable of responding to a plurality of distributed wireless and hardwired sensors/transducers and is programmable via user, central station and installer-entered system ...


2
Paul K Severson, Richard M Meidl: Transformer system for power line communications. Interactive Technologies, Fish & Richardson P C P A, June 23, 1998: US05770996 (52 worldwide citation)

A transformer system couples a control panel with a power line to support two-way communications over the power line. A first transformer steps-down the power line voltage, supplying power to the control panel. A second transformer and associated capacitors provide a low impedance path at the commun ...