Patents by Inventor Charles L. Thompson

Charles L. Thompson 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).

  • Method of and apparatus for compensating for temperature in leak testing
    Patent number: 4272985
    Abstract: A method and apparatus for testing for leaks in a test item which has a temperature different from ambient temperature in which the test item is sealed at atmospheric pressure and the pressure of the sealed air in the test item is measured. The rate of change of the pressure of the sealing air due to the non-ambient temperature of the test item is calculated for providing a temperature correction signal proportional to the temperature of the test item and the temperature correction signal is stored. The test item is then subjected to a leak test pressure, any change in the pressure of the pressurized test item is measured and the stored correction signal is applied to the pressure measurement for determining the extent of any leak in the test item while compensating for the temperature of the test item.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: June 16, 1981
    Assignee: Uson Corporation
    Inventors: William J. Rapson, Jr., Leroy C. Delatorre, Charles L. Thompson