Video conference installation
Patent 4995071 Issued on February 19, 1991. Estimated Expiration Date: 
May 30, 2009. 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 30, 2009. 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 ReferencesMethod and system for reducing conference bridge oscillations Teleconferencing method and system Communication system for videoconferencing Video-telephone communications system Patent #: 4893326 InventorsAssigneeApplicationNo. 359028 filed on 05/30/1989US Classes:348/14.08Conferencing (e.g., loop)ExaminersPrimary: Ng, Jin F.Assistant: Woo, Stella Attorney, Agent or FirmForeign Patent References
International ClassesH04N 007/12H04N 007/14 Foreign Application Priority Data1988-07-08 DEAbstractA video conference installation has transmission and reception devices for handling audio and video signals from a plurality of subscriber points via a shared processor which assigns individual subscriber units to the subscriber points. A digital communication system connects subscriber telephone sets (F) to the shared processor via subscriber circuits (AL) having two utility channels and a signalling channel. Audio is pulse code modulated for transmission over one utility channel and compressed video is transmitted over the other. Each subscriber point has a video monitor (B) and video camera (K). Control symbols (SS, SY) are displayed on the subscriber's monitor via an overlay generator (OG). The subscriber can initiate control and switching actions by pointing to displayed symbols on the screen using a cursor, light pen or position sensitive screen input.Other References
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