Patents by Inventor Thomas R. Ritchart

Thomas R. Ritchart 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).

  • Patent number: 5792952
    Abstract: A fluid thermal mass flow meter including a composite flow tube having four tubular segments of high thermal conductivity formed in a length of tube made of a material having a relatively low thermal conductivity, a thin film element formed on the surface of and extending around each of the four tubular segments, circuitry for incorporating the elements into a bridge circuit, and a housing for containing the flow tube, elements, and circuitry.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: August 11, 1998
    Assignee: Varian Associates, Inc.
    Inventor: Thomas R. Ritchart