Video/audio information transmission system
Patent 4734765 Issued on March 29, 1988. Estimated Expiration Date: 
March 29, 2005. 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.
March 29, 2005. 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 3500327 3654708 3813485 3854004 Pictorial information retrieval system Document filing, updating and retrieval system Autonomous display processor Patent #: 4115765 InventorsAssigneeApplicationNo. 05/965704 filed on 12/01/1978US Classes:348/107, With record location725/115, Data storage or retrieval725/119, Having significant intermediate network unit (e.g., hub, substation, etc.)725/122, Return path via telephone network725/131, Receiver (e.g., set-top box)725/87Video-on-demandExaminersPrimary: Orsino, Joseph A.Attorney, Agent or FirmInternational ClassesH04M 11/08 (20060101)H04N 1/00 (20060101) H04N 1/21 (20060101) Foreign Application Priority Data1977-12-02 JPAbstractA center-to-end type information service system utilizing the public telephone networks that are fundamental communication media of nation-wide scale is disclosed in which desired information is requested from the terminal side to the center by means of a telephone set or simplified keyboard and then delivered to and received by a TV receiver. A part of the center functions is transferred together with the exchange function to a subcenter located near the terminal. Thus, the length of transmission path connecting the center to terminals becomes shorter and the cost of the whole system can be cut down. A simplified character generator is provided in the subcenter, thereby diminishing traffic of the video network. | |
