Patents by Inventor Herbert Joachim Koch

Herbert Joachim Koch 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).

  • Sound-slide projector control apparatus
    Patent number: 4041457
    Abstract: A sound-slide projector of a basic form illustrated in U.S. Pat. No. 3,732,000 is equipped with a keyboard which controls a digital servomotor to position a slide tray for random access to the sound-slides. Operation of a mechanical slide-changing mechanism formerly cyclically operated in a predetermined time by a flywheel is temporarily interrupted by a solenoid while the servomotor positions the slide tray to provide variable timing required for random selection of sound slides.
    Type: Grant
    Filed: March 16, 1976
    Date of Patent: August 9, 1977
    Inventor: Herbert Joachim Koch