Patents by Inventor Philip C. Demarest

Philip C. Demarest 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).

  • Method of in vivo calibration of a pressure sensor
    Patent number: 4886070
    Abstract: An improved miniature, in vivo, pressure sensor is disclosed which comprises a housing having an internal chamber adapted to be connected to a conduit for varying the pressure therein; a piezoresistive element positioned in the chamber and adapted to be connected to a circuit for sensing changes in the resistance of the piezoresistive element; a pressure responsive element carried by the housing and having an inner portion and an outer portion, the inner portion being exposed to the pressure extant in the interanl chamber and the outer portion being exposed to ambient pressure conditions outside of the housing; and a coupling device releasably coupling the pressure responsive element to the piezoresistive element in such a manner that when equal pressures are concurrently applied to the inner and outer portions of the pressure responsive element, the pressure responsive element applies a predetermned load to thre piezoresistive element and when unequal pressures are concurrently applied to the inner and outer
    Type: Grant
    Filed: May 11, 1988
    Date of Patent: December 12, 1989
    Assignee: Thermometrics, Inc.
    Inventor: Philip C. Demarest