Patents by Inventor Douglas H. Green

Douglas H. Green 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).

  • Auto-coupling tool for drill-pipes
    Patent number: 4681175
    Abstract: An automatic broken-drill-pipe-intercoupling tool having, a body portion with, at one end, a female threaded adapted to cooperate with the threaded male end of the retrievable portion of a broken drill pipe and at the other end a tapered, multi-interwined-spiral bit portion, integral with the body portion, the body portion having flats thereon to permit tightening of the tool on the retrievable portion of the broken drill pipe.
    Type: Grant
    Filed: October 5, 1984
    Date of Patent: July 21, 1987
    Inventors: Bruce Bocking, Joe A. Cervantes, Jr., Douglas H. Green, Bruce W. La Sota, David H. Marshall, Bernard Rodriguez, Glen Van Gorden