Patents by Inventor Joe Cal

Joe Cal 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).

  • Wheel-load sensor with piezo-electric pickup and method of manufacturing such a sensor
    Patent number: 5571961
    Abstract: A wheel-load sensor cast into a mass of material for positioning in a depression in a pavement or the like. The sensor includes a piezo-electric pickup. The pickup encloses an inner electrode and is enclosed in at least one outer electrode. The inner electrode is a solid conductor and the outer electrode a hollow conductor. The pickup can be positioned in the pavement. Some sections (16) of the wall of the piezo-electric pickup (11) more or less parallel the surface of the road. These sections are accommodated subject to a prescribed pressure between the adjacent sections of the wall of the hollow conductor (13') that constitutes the outer electrode and the other sections (16') of the wall of the piezo-electric pickup in the hollow conductor and away from the rest of the walls.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: November 5, 1996
    Assignee: Pietzsch AG
    Inventors: Siegfried Gassner, Joe Cal