Patents by Inventor Charles D. Elder

Charles D. Elder 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 and apparatus for testing welds in plastic pipe
    Patent number: 4610166
    Abstract: Welds in plastic pipe are tested by compressing the welded portion in a generally radial direction.
    Type: Grant
    Filed: May 6, 1985
    Date of Patent: September 9, 1986
    Assignee: The Dow Chemical Company
    Inventors: Charles D. Elder, Thomas E. Reder