Patents by Inventor John C. Doudican

John C. Doudican 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).

  • Self-contained constant stress/constant strain test fixture
    Patent number: 5798463
    Abstract: A tensile test fixture for applying constant tensile forces to a tensile test specimen comprises two mounting grips, each mounted to one of two lever arms in a pivoted lever arm frame structure. One end of each lever arm is pivotally attached to a compression column while the other end of each lever arm is attached to one end of a force-applying assembly. The mounting grips are pivotally attached to their respective lever arms between the compression column and the force-applying assembly and are designed to hold opposite ends of a tensile test specimen. The force-applying assembly comprises stress and strain modules that are interchangeably installable into the force-applying assembly to selectively subject tensile test specimens to constant strain and constant stress.
    Type: Grant
    Filed: February 12, 1997
    Date of Patent: August 25, 1998
    Assignees: Automotive Composites Consortium, University of Tulsa
    Inventors: John C. Doudican, Edward M. Hagerman, John M. Henshaw, Laura J. Meyer, Daniel Q. Houston