Patents by Inventor Thomas P. L. Liu

Thomas P. L. Liu 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).

  • Film writing system with closed loop control for electronic images
    Patent number: 4700058
    Abstract: An imaging system for generating a image on film from video image data incorporates feedback control techniques to provide control of film density. The system includes variable gain amplifiers responsive to light intensity output of a film writing device for maintaining the output at a desired set level. In addition, the system includes apparatus and a method for monitoring the density of film images produced by the system and for utilizing the monitored values to modify the system transfer function in a direction to effect a change in the film density towards a desired value.
    Type: Grant
    Filed: August 1, 1985
    Date of Patent: October 13, 1987
    Assignee: General Electric Company
    Inventors: Barry F. Belanger, Thomas P. L. Liu, Thomas W. Lambert
  • Picture signal generator with light level control
    Patent number: 4141043
    Abstract: A picture signal generator includes a fast-acting servo loop responsive to changes in video output level to adjust image tube photocathode-to-storage-target accelerating voltage to maintain desired video output level, and a slow-acting servo loop responsive to the output of a portion of the fast-acting servo loop for adjusting input light level to the photocathode for optimum image tube operation.
    Type: Grant
    Filed: April 18, 1977
    Date of Patent: February 20, 1979
    Assignee: General Electric Company
    Inventor: Thomas P. L. Liu