Patents by Inventor Murray Robert Campbell

Murray Robert Campbell 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).

  • Floor maintenance brush
    Patent number: 4037369
    Abstract: A brush or pad having fibers of varying abrasive characteristics, the fibers of greater abrasive characteristics being located towards the center of the brush and the fibers of lesser abrasive characteristics being located towards the outer periphery of the brush.
    Type: Grant
    Filed: October 1, 1975
    Date of Patent: July 26, 1977
    Inventor: Murray Robert Campbell