Patents by Inventor Andrew Mitchell

Andrew Mitchell 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).

  • Molded fittings and methods of manufacture
    Patent number: 4262744
    Abstract: A well screen and method for its manufacture are disclosed. The well screen is assembled from molded parts. The parts are initially formed with a continuous, imperforate outer skin. Continuous circumferential slots are cut in the skin to form a foraminous screen. Integrally formed annular ribs located between each slot provide crush resistance.
    Type: Grant
    Filed: December 14, 1979
    Date of Patent: April 21, 1981
    Assignee: Certain-teed Corporation
    Inventors: Andrew Mitchell, Kermit W. Janssen