1
Ronald Carter: Two-way audio-video communication method for receiving person at entrance. Revolutionary Concepts, Tillman Wright PLLC, Chad D Tillman, Jeremy C Doerre, March 27, 2012: US08144183 (64 worldwide citation)

A method for two-way audio-video communications between a first person at an entrance and a second person comprises the steps of detecting, with a proximity sensor located proximate an entrance, the presence of a first person at the entrance and providing real time audio-video communications between ...


2
Ronald Carter: Two-way audio-video communication method for receiving person at entrance. Revolutionary Concepts, Tillman Wright Pllc, May 10, 2007: US20070103541-A1

A method for two-way audio-video communications between a first person at an entrance and a second person comprises the steps of detecting, with a proximity sensor located proximate an entrance, the presence of a first person at the entrance and providing real time audio-video communications between ...