Patents by Inventor James R. La Croix

James R. La Croix 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).

  • Pressure measuring apparatus using vibratable wire
    Patent number: 4165651
    Abstract: A differential-pressure measuring instrument comprising a main body assembly with a pair of diaphragms each subject to a respective fluid pressure. The diaphragms enclose a sealed chamber containing a fill-liquid surrounding a non-magnetic vibratable wire which is tensioned in accordance with the applied differential pressure. A magnetic field passes transversely through the wire, and electrical current is supplied to the wire by electronic circuit means to produce a vibratory force on the wire as a result of interaction between the electrical current and the magnetic field.
    Type: Grant
    Filed: September 19, 1977
    Date of Patent: August 28, 1979
    Assignee: The Foxboro Company
    Inventors: Everett O. Olsen, James R. La Croix, Hoel L. Bowditch
  • Vibratable-wire instrument having an improved temperature compensating technique
    Patent number: 4165652
    Abstract: A differential-pressure measuring instrument includes a pair of diaphragms each subject to a respective fluid pressure. The diaphragms enclose a sealed chamber containing a fill-liquid surrounding a non-magnetic vibratable-wire which is tensioned in accordance with the applied differential pressure.A temperature compensating inductor is connected in parallel with the vibratable-wire to compensate for variationsin the vibrating frequency of the wire due to changes in the viscosity of the fill-liquid with temperature.
    Type: Grant
    Filed: June 2, 1978
    Date of Patent: August 28, 1979
    Inventors: Everett O. Olsen, James R. La Croix, Donald C. Simpson