Patents by Inventor Samuel S. Chung

Samuel S. Chung 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).

  • Weak beam scanning of cathode ray tubes
    Patent number: 4940440
    Abstract: In the processing of cathode ray tubes, both the incidence of dark center cathode and residual gas can be reduced by including the step of scanning the mask and screen of the tube with a weak, defocused electron beam, carried out after getter flashing and preferably prior to aging.
    Type: Grant
    Filed: December 23, 1987
    Date of Patent: July 10, 1990
    Assignee: North American Philips Corporation
    Inventors: Charles H. Rehkopf, Franklin G. Reigel, Samuel S. Chung
  • Aging process for cathode ray tubes
    Patent number: 4832646
    Abstract: An improved aging process for a cathode ray tube in which the main focusing grid (G3) is aged at a potential below that of the G2 grid, resulting in significantly reduced incidence of dark center cathode.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: May 23, 1989
    Assignee: North American Philips Consumer Electronics Corp.
    Inventors: Samuel S. Chung, Charles H. Rehkopf, Franklin G. Reigel, Doanld L. Siefker, James R. Stowe