Patents by Inventor Michael A. Hoffmann

Michael A. Hoffmann 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).

  • Selective twist filtration roving
    Patent number: 4801383
    Abstract: This invention relates to a filtration roving with the cross section of the roving exhibiting portions more tightly twisted than the remainder of the roving.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: January 31, 1989
    Assignee: MEMTEC North America Corp.
    Inventors: Michael A. Hoffmann, Robert J. Schmitt