Patents by Inventor Mark A. Richards

Mark A. Richards 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).

  • Patent number: 4232250
    Abstract: An improved erase cycle for direct-viewing bistable storage tubes that substantially eliminates the bright flash characteristic of conventional erasure methods. As applied to the backplate of a meshless storage tube, the improved cycle suitably comprises two or more short (about 2 to 10 ms) fade positive pulses separated by a negative, decaying recovery pulse about 50-100 ms in length and optionally, a "dead time" of about 200 ms at the target operating level. The final fade positive pulse is followed by a longer recovery interval that gradually increases the backplate voltage to its previous operating level while the flood guns retain the storage phosphor in an erased, unwritten condition.
    Type: Grant
    Filed: April 19, 1979
    Date of Patent: November 4, 1980
    Assignee: Tektronix, Inc.
    Inventor: Mark A. Richards