Patents by Inventor Robert W. Zimmerman

Robert W. Zimmerman 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).

  • Exhaust stack cleaning and polishing implement
    Patent number: 4375115
    Abstract: An arcuate somewhat resilient holder for a flexible polishing element is rotationally attached through a short radial arm to a descending elongated rigid handle set at an obtuse angle to a plane through the holder and arm. A user of the implement standing on the ground can conveniently polish the vertical exhaust stack of a diesel truck or tractor.
    Type: Grant
    Filed: October 7, 1981
    Date of Patent: March 1, 1983
    Inventor: Robert W. Zimmerman