Patents by Inventor Ferdinand Marinus Trees

Ferdinand Marinus Trees 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).

  • Shaving head for a dry-shaving apparatus
    Patent number: 3973323
    Abstract: A dry-shaver with a flexible foil shear plate and a reciprocating cutter, the cutter comprising a plurality of cutting elements each having a generally elliptic shape, the cutter being tiltable about an axis parallel to the direction of reciprocating movement, with a tendency of the cutter to tilt toward the point at which pressure is applied through the shear plate onto the cutter.
    Type: Grant
    Filed: June 19, 1974
    Date of Patent: August 10, 1976
    Assignee: U.S. Philips Corporation
    Inventor: Ferdinand Marinus Trees