Patents by Inventor Frederick D. Lehman

Frederick D. Lehman 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).

  • Drive circuits for a high resolutions cathode ray tube display
    Patent number: 4353013
    Abstract: A dynamic new circuit is disclosed which permits an extremely high resolution cathode ray tube display. Utilizing this circuit, horizontal drive operating frequency may be increased by a factor of approximately four and video drive operating frequency may be increased by a factor of approximately ten. Improved circuits for horizontal drives vertical drive, video drive and associated circuitry are disclosed which cooperate to produce a high frequency display which has unparalleled clarity and resolution.
    Type: Grant
    Filed: December 17, 1979
    Date of Patent: October 5, 1982
    Assignee: CPT Corporation
    Inventor: Frederick D. Lehman
  • Drive circuits for a high resolution cathode ray tube display
    Patent number: 4323826
    Abstract: A dynamic new circuit is disclosed which permits an extremely high resolution cathode ray tube display. Utilizing this circuit, horizontal drive operating frequency may be increased by a factor of approximately four and video drive operating frequency may be increased by a factor of approximately ten. Improved circuits for horizontal drive, vertical drive, video drive and associated circuitry are disclosed which cooperate to produce a high frequency display which has unparalleled clarity and resolution.
    Type: Grant
    Filed: December 17, 1979
    Date of Patent: April 6, 1982
    Assignee: CPT Corporation
    Inventor: Frederick D. Lehman
  • Drive circuits for a high resolution cathode ray tube display
    Patent number: 4238774
    Abstract: A dynamic new circuit is disclosed which permits an extremely high resolution cathode ray tube display. Utilizing this circuit, horizontal drive operating frequency may be increased by a factor of approximately four and video drive operating frequency may be increased by a factor of approximately ten. Improved circuits for horizontal drive, vertical drive, video drive and associated circuitry are disclosed which cooperate to produce a high frequency display which has unparalleled clarity and resolution.
    Type: Grant
    Filed: April 17, 1978
    Date of Patent: December 9, 1980
    Assignee: CPT Corporation
    Inventor: Frederick D. Lehman