Patents by Inventor Douglas DeWolfe

Douglas DeWolfe 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).

  • Magnetoresistor bridge probe for locating the position of a magnetic tube support sheet of a nonmagnetic heat exchange conduit
    Patent number: 4182985
    Abstract: Apparatus for locating the position of at least one magnetic member relative to a nonmagnetic member includes a probe assembly movably disposed within the nonmagnetic member and including a nonmagnetic head having a pair of spaced permanent magnets mounted thereon. Each magnet has a variable resistor connected thereto, the resistance of each resistor varying directly with the strength of the flux field emanating from each magnet. The resistors are connected to a source of electrical energy for providing an electrical control signal, the magnitude of which varies in response to the movement of the probe assembly including the magnets and resistors relative to the magnetic member.
    Type: Grant
    Filed: April 14, 1978
    Date of Patent: January 8, 1980
    Assignee: Carrier Corporation
    Inventors: Douglas DeWolfe, Richard A. Sturley, Francis E. McPhilmy