Patents by Inventor Harold E Riffell

Harold E Riffell 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: 10421132
    Abstract: A drill extension for extending the working reach of a drill uses a hollow tubular body that has a shaft rotatably disposed therein and held therein by a pair of spaced apart bearings, each bearing attached to an inner surface of the body. The shaft has a male end that is received within a chuck of the drill and an opposing female receiver for receiving a shaft of a drill or the male end of another drill extension. A handle is attached the outer surface of the body member such that the handle has a ring member that is received within an encircling groove on the outer surface of the body member, the handle also has a grasp arm. At least one level is attached to the outer surface and is oriented either radially with respect to a longitudinal axis of the body member or in parallel with the axis or both.
    Type: Grant
    Filed: December 27, 2016
    Date of Patent: September 24, 2019
    Inventor: Harold E Riffell