Patents by Inventor Bernard C. Keach

Bernard C. Keach has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Digital logic control for audio visual programs and method therefor
    Patent number: 4075668
    Abstract: The present disclosure is directed to a logic control system for maintaining sync between an audio tape program and a slide or film projector by adding a signal track to the tape on which is recorded a tape stop signal and projector frame change signal which through a digital logic control circuit synchronization between the audio and visual components is preserved irrespective of tape speed or direction.
    Type: Grant
    Filed: December 18, 1975
    Date of Patent: February 21, 1978
    Assignee: Educational Electronics of California Inc.
    Inventor: Bernard C. Keach