Patents by Inventor Mark S. Butcher

Mark S. Butcher 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).

  • Circuit system for switching loudspeakers
    Patent number: 5751818
    Abstract: A circuit system for selectively switching between main and remote loudspeakers includes a pair of input terminals for applying an input audio signal to the loudspeakers. A first selector switch contact is provided in series with the main loudspeakers. A second selector switch contact is provided in series with the remote loudspeakers. A current-dependent resistance element is provided in series with the remote loudspeakers to protect the remote loudspeakers from overdrive. The circuit system may also include a second current-dependent resistance element and a cooperating defeat switch contact as well as a resistor and associated load limiting switch contact all in series with the remote loudspeakers.
    Type: Grant
    Filed: September 5, 1996
    Date of Patent: May 12, 1998
    Assignee: Audio Authority Corporation
    Inventors: Jonathan Gertz, Mark S. Butcher, James M. Tuomy