Patents by Inventor Richard Allen Springer

Richard Allen Springer 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).

  • Keyboard circuit
    Patent number: 4106011
    Abstract: A simplified keyboard for a terminal device, calculator, or the like, in which each key is sequentially scanned and parallel key code data is sent to an entry register. A pair of flip-flops in combination with firmware ascertain that only valid key code data is sent to the entry register for utilization by the system, providing double entry and key bounce protection. The firmware further provides N-key rollover and auto repeat with a variable repeat rate, and expands the keyboard from a single-mode to an eight-mode capability.
    Type: Grant
    Filed: October 24, 1975
    Date of Patent: August 8, 1978
    Assignee: Tektronix, Inc.
    Inventors: John Laurence Melanson, Richard Allen Springer, Jack Duane Grimes, Jack Arthur Gilmore