Patents by Inventor Dennis P. Damewood

Dennis P. Damewood 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).

  • Variable input amplified speaker with improved power input section
    Patent number: 5164991
    Abstract: An amplified speaker has an amplifier section including an audio amplifier powered from a power input section and a variable audio input section for supplying an input audio signal via an audio transformer to the audio amplifier. The power input section includes a rectifier bridge and a capacitor filter circuit, so that power may be obtained from an inexpensive unregulated AC source rather than an expensive regulated DC power supply. The variable audio input section permits audio signals at various levels from 30 mVrms to 70.7 Vrms to be inputted.
    Type: Grant
    Filed: February 13, 1990
    Date of Patent: November 17, 1992
    Inventors: Thomas J. Johnson, James W. Lester, Dennis P. Damewood