Patents by Inventor Charles Robert Keller

Charles Robert Keller 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: 3952999
    Abstract: An apparatus for pulling a wire through a conduit comprising a base including a planar bottom surface for frictionally engaging a floor and a pair of wedges for anchoring the base to a wall, a pair of upstanding members each being affixed to the base, a shaft oriented with its axis parallel to the bottom surface and journaled proximate each end to the upstanding members, and a pulley secured to an end of the shaft, the pulley having a grooved rim which is formed to receive the wire and having a diameter large enough to prevent the wire from acquiring a set.
    Type: Grant
    Filed: May 12, 1975
    Date of Patent: April 27, 1976
    Inventors: Charles Robert Keller, William D. Martin