Video-telephone communications system

Patent 4893326 Issued on January 9, 1990. Estimated Expiration Date:

May 4, 2007. 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.

Abstract Claims Description Full Text

Patent References

Re31639

3584142

3678207

3775563

High speed central office scanner
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Audio-enhanced videotex system
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Inventor: Bendig

Local area network packet protocol for combined voice and data transmission
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Inventors

Assignee

Video Telecom Corp.

Application

No. 046248 filed on 05/04/1987

US Classes:

348/14.12, Transmission control (e.g., resolution or quality)379/93.17, Having station display379/908MULTIMEDIA

Examiners

Primary: Ng, Jin F.
Assistant: Kim, David H.

Attorney, Agent or Firm

Rockey and Rifkin

International Class

H04N 001/42

Abstract

An auxiliary unit is used in conjunction with a personal computer based work station for interconnecting the work station to an audio-visual communications network. The auxiliary unit includes a CRT, a camera, a speaker phone circuit, and a CPU for interfacing these elements with each other and with the communications network to permit the transmission and reception of voice, video and computer graphics information.

Other References

IBM Technical Reference, "Options and Adaptors", vol. 2, Apr. 1984, pp. 17-20
James W. Cronin, "Dial-up Video Speeds Business Decisions", Telephony, vol. 210, No. 13, Mar. 1986, pp. 32-33
Peter C. Lowten, "The Potential for Video Teleconferencing Utilizing A VSAT System", Teleconference, vol. 6, No. 2, Mar. 1987, pp. 2-6
Neil S. Dumas, "Adding Color Graphics to Telephone Conferences", Army R,D & A, vol. 24, No. 5, Sep.-Oct. 1983, pp. 30-31
Rolf Evers et al., "An Experimental Interactive Cable TV System", 1980 International Conference on Communications, Jun. 1980, pp. 54.2.1.varies.