Patents by Inventor G. D. Skip Allard

G. D. Skip Allard 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).

  • Drill string system
    Patent number: 4036539
    Abstract: A drill string system, having a greatly reduced tendency for balling and sticking in oil field clay or sticky shale, is provided on its non-bearing surfaces, with an adherent plastic covering, e.g. a polyurethane polymer. The plastic coating is applied to the non-bearing steel surfaces of the string, which have been cleaned of rust and have been coated with a primer.
    Type: Grant
    Filed: May 9, 1975
    Date of Patent: July 19, 1977
    Inventors: Leonard R. Saunders, G. D. Skip Allard