Patents by Inventor David A. Vrtol

David A. Vrtol 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).

  • Patent number: 4869435
    Abstract: A portable pocket size paper shredder housing having a paper entrance slot on the front end with an enclosed trough leading to a pair of shredding rollers and an exit slot on the back end. A first shredding roller comprising a circular drive shaft covered with a compressible, fractional material. The second shredding roller having a plurality of thin circular cutting knives axially spaced on the drive shaft. The spacers being of a compressible frictional material. The first shredding roller having circumferential slots matching the edges of the cutting knives. The coacting shredding rollers coupled to an electric motor drive by associated gearing means.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: September 26, 1989
    Inventors: Gary M. Pistorius, David A. Vrtol