Patents by Inventor Thomas F. Mills

Thomas F. Mills 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).

  • Self-energizing electrostatic loudspeaker system
    Patent number: 3992585
    Abstract: A power supply for generating polarizing voltages for the drivers on an electrostatic speaker system includes a charging circuit which charges a battery from the applied audio signal. A dc-to-dc converter generates the relatively high polarizing voltages from the battery voltage and it includes an oscillator which generates an alternating voltage to a voltage multiplier circuit. An electronic switch circuit turns the oscillator on when an audio signal is present and turns it off a preselected time interval after the audio signal is removed.
    Type: Grant
    Filed: October 6, 1975
    Date of Patent: November 16, 1976
    Assignee: Koss Corporation
    Inventors: Jacob C. Turner, Douglas M. Elliott, Robert M. Grodinsky, Thomas F. Mills