Patents by Inventor Christopher A. Willis

Christopher A. Willis 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).

  • Transducer with apertures in tubular conductor
    Patent number: 4810990
    Abstract: A variable inductance transducer includes a winding which is wound about a cylindrical former and a tubular member formed from electrically conductive material which is located about the winding and is movable axially relative thereto. The tubular member is provided with a number of apertures along its length in order to improve the linearity of the transducer.
    Type: Grant
    Filed: February 18, 1988
    Date of Patent: March 7, 1989
    Assignee: Lucas Industries Public Limited Company
    Inventor: Christopher A. Willis
  • Flow measurement/metering
    Patent number: 4807480
    Abstract: Powder mass flow rates are measured by constraining the powder to flow within an apparatus which injects a charge into the powder at a first position and measures at a plurality of positions downstream from the first position the charge remaining in the powder and means for calculating from the injected and remaining charge the powder mass flow.
    Type: Grant
    Filed: August 5, 1986
    Date of Patent: February 28, 1989
    Assignee: National Research Development Corporation
    Inventors: Brian C. O'Neill, Christopher A. Willis
  • Aquarium air pump
    Patent number: D247436
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: March 7, 1978
    Assignee: Willinger Bros., Inc.
    Inventors: Allan H. Willinger, Harding W. Willinger, Monte L. Levin
  • Attachment for a strap
    Patent number: D709545
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: July 22, 2014
    Assignee: Thule Organization Solutions, Inc.
    Inventors: Jerry L. Goff, Christopher A. Willis, Nathan R. Zwetzig
  • Angled attachment for a strap
    Patent number: D709546
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: July 22, 2014
    Assignee: Thule Organization Solutions, Inc.
    Inventors: Jerry L. Goff, Christopher A. Willis, Nathan R. Zwetzig