Patents by Inventor Joseph W. Vandgriff

Joseph W. Vandgriff 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).

  • Implantable cardiac stimulator with automatic gain control
    Patent number: 4903699
    Abstract: An implantable cardiac stimulator for detecting and treating bradycardias includes a sense amplifier responsive to sensed cardiac signals for detecting cardiac activity. The sense amplifier includes an automatic gain control amplifier, a filter and quad comparator having a pair of signal channels to establish sensing thresholds, margins and signal gain. The sense amplifier has a feedback loop containing a microprocessor which implements preselected algorithms in conjunction with the outputs of the quad comparator to variably adjust the amplifier gain and to programmably control the sensing margin.
    Type: Grant
    Filed: June 7, 1988
    Date of Patent: February 27, 1990
    Assignee: Intermedics, Inc.
    Inventors: Ross G. Baker, Jr., Edward A. Haluska, Joseph W. Vandgriff