Patents by Inventor Patrick D. Quinn

Patrick D. Quinn 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).

  • Patent number: 5253528
    Abstract: Nondestructive testing of heat exchangers (12), such as a radiator, measures the percentage of good bonds between air centers and cooling tubes based on natural or resonant frequencies of the exchanger (12). The exchanger (12) is excited by an audio speaker (38) and measured for a first natural frequency in the center thereof by an accelerometer (44). The natural frequency is indicative of the percentage of good bonds in the center portion of the exchanger (12) based on the stiffness thereof. The audio speaker (38) is moved to an antinode of a higher frequency mode to measure a second natural frequency indicating the percentage of bonds at the edges and corners thereof. The resonant frequencies are compared to standards to determine the actual percentage of good bonds.
    Type: Grant
    Filed: June 17, 1991
    Date of Patent: October 19, 1993
    Assignee: General Motors Corporation
    Inventors: John H. Varterasian, Francis H. Chen, Wolfgang Kiel, Kent E. Brittin, Patrick D. Quinn, Kenneth J. Zielesch, Kurt A. Tesnow, Thomas H. Worswick