Patents by Inventor Michael van Moppes

Michael van Moppes 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).

  • Tumbling apparatus
    Patent number: 3971167
    Abstract: A tumbling apparatus having a plurality of tumbling barrels for use primarily for grinding or polishing semi-precious stones or the like. The apparatus having a single motor for directly and indirectly rotating the barrels, the barrels having peripheral drive portions in the form of gear teeth which are of different diameter so that different rotation speeds for the barrels may be made.
    Type: Grant
    Filed: June 11, 1975
    Date of Patent: July 27, 1976
    Inventor: Michael van Moppes