Patents by Inventor Peter B. Lewis

Peter B. Lewis 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).

  • Magnetic flowmeter with diagnostics
    Patent number: 6014902
    Abstract: A magnetic flowmeter has a tube for supporting fluid flow including a circuit for indicating when the tube is empty to prevent an erroneous flow signal from being provided by the flowmeter, as well as a diagnostic circuit indicating when electrodes in the flowmeter are partially fouled. The circuits include an amplifier connected to two electrodes in the tube and a variable resistor. In a normally operating mode, the amplifier produces an oscillating signal when the tube is empty, and in a diagnostic mode, the amplifier produces an oscillating signal when the electrodes are partially fouled.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: January 18, 2000
    Assignee: The Foxboro Company
    Inventors: Peter B. Lewis, Norman Fonteneau
  • Magnetic flowmeter with empty tube detection
    Patent number: 5895864
    Abstract: A magnetic flowmeter has a tube for supporting fluid flow and a circuit for indicating when the tube is empty. The circuit includes an amplifier connected to two electrodes in the tube and a variable resistor. The amplifier produces an oscillating signal when the tube is empty.The circuit is calibrated for a particular fluid by finding a range of resistances for the variable resistor at which the circuit provides an accurate indication that the tube is empty, and storing information in the processor indicating a resistance in the range for the fluid.
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: April 20, 1999
    Assignee: The Foxboro Company
    Inventors: Shiquan Wang, Peter B. Lewis, Norman O. Fonteneau, Vincent W. Devore
  • Flow tube liner
    Patent number: 5773723
    Abstract: A magnetic flowmeter has a tube for carrying fluid along a longitudinal axis. The tube has faces transverse to the longitudinal axis and disposed at opposite ends of the tube. A liner on the inner surface of the tube extends out from an end of the tube and into a recess on one face to anchor the liner in place.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: June 30, 1998
    Inventors: Peter B. Lewis, Richard A. Bertone, Richard W. Kalinoski, Michael R. Sheridan