Patents by Inventor Harry J. Dunham

Harry J. Dunham 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).

  • Double-walled well casing structure
    Patent number: 4130301
    Abstract: A double-walled well casing for use in containing a fluid which is hotter than the ambient. The cavity between the double walls may contain insulation. Seals which maintain the inner and outer pipes in concentric relationship are designed to relieve the axial compressive stress on the inner pipe (resulting from thermal expansion relative to the outer pipe) by being stressed beyond their yield points.
    Type: Grant
    Filed: December 13, 1977
    Date of Patent: December 19, 1978
    Assignee: General Electric Company
    Inventors: Harry J. Dunham, Gordon P. Hurd