Patents by Inventor John D. Witcombe

John D. Witcombe 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).

  • Mixer
    Patent number: 4761076
    Abstract: There is provided a mixer especially suitable for small batches of cementitious product comprising a receptacle and means for mounting a motor drivable paddle arrangement within the receptacle in such a manner that the paddle, while operating, can be moved manually to sweep substantially the entire volume of said receptacle.In preferred arrangement the paddle arrangement is powered by a portable electric drilling machine.
    Type: Grant
    Filed: June 5, 1985
    Date of Patent: August 2, 1988
    Inventor: John D. Witcombe