Videophone
Patent 5079627 Issued on January 7, 1992. Estimated Expiration Date: 
June 29, 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.
June 29, 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 References 1932253 Video telephone Conversational video phone Moving picture signal transmission system Simultaneous audio and video transmission with restricted bandwidth Patent #: 4849811 InventorAssigneeApplicationNo. 375266 filed on 06/29/1989US Classes:348/14.15, Field or frame difference (e.g., moving frame)348/14.01, TWO-WAY VIDEO AND VOICE COMMUNICATION (E.G., VIDEOPHONE)348/743, With moving color filters348/744Projection deviceExaminersPrimary: Ng, Jin F.Assistant: Woo, Stella Attorney, Agent or FirmInternational ClassesH04N 007/14H04N 001/42 AbstractThe present invention, the Videophone, is a compact audio/video device that is capable of both sending and receiving audio and visual signals, and is designed to be compatible with standard telephone equipment. The Videophone includes a modified speakerphone, a camera, a viewing screen, and an imaging system based upon a revolving disk of film having a series of holographic apertures which divide the subject image into elements of light. The disk has two bands which are used to alternately scan and reproduce an image. The visual image is process by unique circuitry that can, for ease of manufacture, be contained on a single customized chip. The videophone has the capability to transmit a full motion picture of reasonably good quality. Moreover, audio transmission is not blocked during transmission of the video signal.Other References
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