Patents by Inventor Mark Erich Biernath

Mark Erich Biernath 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).

  • Lawnmower blade with replaceable knives
    Patent number: 5839263
    Abstract: A lawnmower blade with replaceable knife members (40) mounted on the leading edge of a rotating blade body wherein the entire assembly to a rotating shaft of a lawnmower or the like. The knife member (40) is manufactured from carbides, high speed steels, or powder metals, thus producing a cutting edge with high quality and durability. Knife member is attached to a rotating body in either a safety cage assembly (100) or embedded in the body of the blade. The knife member is retained on the blade body and can be rotated to a fresh sharp edge or replaced.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: November 24, 1998
    Inventors: Horst Fred Biernath, Mark Erich Biernath, Rolf Werner Biernath