Patents by Inventor John A. Gunnarson

John A. Gunnarson 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).

  • Sheathing and venting of resistance-tape level sensor
    Patent number: 4967594
    Abstract: Sheathing for a resistance-tape level sensor which provides a multiplicity of enclosing envelopes for guarding the critical inner electrical sensing element, and multiple venting paths for respiration and pressure-equalization of chambers formed by the separate envelopes.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: November 6, 1990
    Assignee: Metritape, Inc.
    Inventors: Albert D. Ehrenfried, John A. Gunnarson, William E. Pierce, Thomas C. Thorstensen
  • Mounting head for a resistance-tape level sensor
    Patent number: 4942764
    Abstract: A mounting head for a resistance tape level sensor is provided which includes a cylindrical outer shell enclosing deformable elastomeric elements surrounding and supporting certain elements of the sensor and clamped to provide high internal compressive forces for sealing all leakage paths.
    Type: Grant
    Filed: March 17, 1989
    Date of Patent: July 24, 1990
    Assignee: Metritape, Inc.
    Inventors: Edwin P. Dews, William E. Pierce, John A. Gunnarson, Albert D. Ehrenfried