Patents by Inventor Walter Whittaker

Walter Whittaker 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).

  • Electric lighting systems
    Patent number: 4004185
    Abstract: A method and apparatus of lighting a cold cathode electric gas discharge lamp in which the lamp is connected across the secondary winding of a voltage step-up transformer, and the primary winding of the transformer is energized with a chopped D.C. voltage having a frequency of at least 12 kHz and a voltage which provides an output voltage from the secondary winding having an R.M.S. value no greater than 700 volts.
    Type: Grant
    Filed: April 25, 1975
    Date of Patent: January 18, 1977
    Assignee: E. W. Controls Limited
    Inventors: Harry Edmondson, Walter Whittaker