Patents by Inventor Alfred J. Grainger

Alfred J. Grainger 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).

  • Patent number: 4553615
    Abstract: A rotary drilling drag bit for drilling from the surface deep holes in sub-surface formations e.g. for oil has a body (4) with a diameter of at least 100 mm and having a bore for passage of drilling fluid to its face (3) and rotatable cutting elements (6) having a cutting face comprising an agglomerate of diamond particles so mounted on the body (4) that they are free to rotate in use.The cutting elements are of long life and highly effective in drilling.
    Type: Grant
    Filed: February 17, 1983
    Date of Patent: November 19, 1985
    Assignee: NL Industries, Inc.
    Inventor: Alfred J. Grainger
  • Patent number: 4511006
    Abstract: The cutting edge of a bit of a rotary drill comprises an agglomerate of natural or synthetic diamond mounted at the free end of a shank freely rotatable in a socket in the body. Preferably the agglomerate and the free end of the shank are cold swaged together and preferably a resilient spring is interposed about the shank between the body and the free end.
    Type: Grant
    Filed: January 17, 1983
    Date of Patent: April 16, 1985
    Inventor: Alfred J. Grainger