Patents by Inventor Richard Calvin Johnson

Richard Calvin Johnson 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).

  • Interface system to control flash lamp
    Patent number: 4090108
    Abstract: An interface for controlling the energy to a flash lamp based on document information. An area coverage sensing device senses the density of document information advanced along a predetermined path and produces electrical signals thereof. A circuit conditions the signals and transmits them to an energy storage for driving the flash lamp.
    Type: Grant
    Filed: July 26, 1976
    Date of Patent: May 16, 1978
    Assignee: Xerox Corporation
    Inventors: Richard Calvin Johnson, Ihor Kulbida