Patents by Inventor Adrian M. Clitheroe

Adrian M. Clitheroe 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).

  • Method and apparatus for increasing the cathode efficiency in a cathode ray tube
    Patent number: 5130606
    Abstract: A CRT display system is described wherein a measure of the beam current generated within the CRT is derived and the voltage across the cathode heater modified as a function of this measure. In this way the optimum voltage across the heater coils is maintained, thus preventing "cathode stripping" at times of peak beam currents, and optimizing the CRT's working lifetime.
    Type: Grant
    Filed: May 9, 1990
    Date of Patent: July 14, 1992
    Assignee: International Business Machines Corporation
    Inventors: Andrew J. Morrish, Julian D. Williams, David J. Eagle, Adrian M. Clitheroe
  • Cathode ray tube apparatus
    Patent number: 4908550
    Abstract: Cathode ray tube apparatus including compensation (14) for the vertical component of terrestrial and of other ambient magnetic fields (15). The compensation is achieved by the generation of an opposing vertical magnetic field by energization of the degauss coil (11, 12) in the apparatus. Two embodiments are described: one applies a continuous direct current (21) after the degaussing operation and the other applies a direct current component coincident with the degaussing signal to permanently magnetize components of the apparatus. The magnitude and polarity of the compensation provided may be variable.
    Type: Grant
    Filed: October 27, 1987
    Date of Patent: March 13, 1990
    Inventors: Elaine Chase, Adrian M. Clitheroe, Edward T. Shepherd, Peter Beanlands