Video disc program branching system
Patent 4571640 Issued on February 18, 1986. Estimated Expiration Date: 
February 18, 2003. 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.
February 18, 2003. 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 2009438 3164685 Audio-visual teaching system Patent #: 4052798 InventorAssigneeApplicationNo. 06/438139 filed on 11/01/1982US Classes:386/92, Simultaneously recording of a plurality of television signals348/385.1, Plural video programs in single channel386/125, Using disc434/307R, CATHODE RAY SCREEN DISPLAY AND AUDIO MEANS434/323, Cathode ray screen display included in examining means434/336, Response of plural examinees communicated to monitor or recorder by electrical signals463/43Data storage or retrieval (e.g., memory, video tape, etc.)ExaminersPrimary: Richardson, Robert L.Attorney, Agent or FirmInternational ClassesG09B 5/00 (20060101)G09B 5/06 (20060101) G11B 27/10 (20060101) G11B 17/00 (20060101) H04N 5/92 (20060101) AbstractA video disc program branching system comprising multiple programs frequency multiplexed on a video disc and co-located substantially in the same portion of the disc wherein branching is achieved by designating specific ones of said multiple programs through frequency band selection.Other References
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