Patents by Inventor Gregory W. Keck

Gregory W. Keck 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).

  • Non-symmetrical light stop
    Patent number: 6844981
    Abstract: In a projection display system for example, a projection lens includes a non-radially symmetrical light stopped that is painted or otherwise applied directly to the surface of an optical lens element of the projection lines.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: January 18, 2005
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Stephen Magocs, Gregory W. Keck, Michael B. Larson, Carl J. Gilman
  • Non-symmetrical light stop
    Publication number: 20040057123
    Abstract: In a projection display system for example, a projection lens includes a non-radially symmetrical light stopped that is painted or otherwise applied directly to the surface of an optical lens element of the projection lines.
    Type: Application
    Filed: September 25, 2002
    Publication date: March 25, 2004
    Inventors: Stephen Magocs, Gregory W. Keck, Michael B. Larson, Carl J. Gilman
  • Combined power supply for main and stand-by power
    Patent number: 5189600
    Abstract: A power supply includes a main power supply section having power dissipating components therein and a stand-by power supply section. When the main power supply section is off, the stand-by power supply section uses the power dissipating components in the main power supply section to dissipate waste power. When the main power supply section is on, power from a secondary power supply driven by the output from the main power supply section is used to drive the stand-by power supply section thereby reducing any power dissipating requirements of the stand-by power supply section.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: February 23, 1993
    Assignee: North American Philips Corporation
    Inventors: Gregory W. Keck, Robert L. Lyle, Jr.