Videophone network system
Patent 4645872 Issued on February 24, 1987. Estimated Expiration Date: 
May 6, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 6, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3587053 3649761 3678207 3706996 3718770 FM television telephone system Video conferencing system using spatial reduction and temporal resolution Videotelephone conference system Digital conference system Time-division telephone system embodying trunks having demodulating-adder circuits InventorsAssigneeApplicationNo. 06/861665 filed on 05/06/1986US Classes:348/14.09, Conferencing with multipoint control unit348/14.11, Switching379/202.01ConferencingExaminersPrimary: George, Keith E.Attorney, Agent or FirmInternational ClassesH04N 7/15 (20060101)H04M 3/56 (20060101) AbstractA controlled access automated-switching conferencing system includes a special microprocessor-controlled control console disposed at each of a plurality of stations. Each station includes video and audio inputs and outputs. Central automatic video and audio switching devices switch the video and audio inputs so that they may be connected to any one or more of the video and audio outputs, and switch the audio outputs so that they may be connected to one or more audio inputs. A central novel system controller controls the automatic switchers in response to selections of function and station selection members associated with any of the control consoles. An interface is associated with each station for operatively interconnecting the station control console, inputs, and outputs with the system controller, and a central line driver interfaces the system controller with the interface structure. The control console function select members have hold, call, cancel, and alternate video functions and a test function for the microprocessor.Other References
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