Patents by Inventor George Washington Benjamin

George Washington Benjamin 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 bit centrifugal vise
    Patent number: 3975029
    Abstract: A pair of eccentrically pivotally mounted vise arms on a base plate element disposed concentrically on a rotatably driven drillhead are urged by centrifugal force during rotation into lockable gripping contact with a drill steel element held in the drillhead.
    Type: Grant
    Filed: August 13, 1974
    Date of Patent: August 17, 1976
    Inventor: George Washington Benjamin