Patents by Inventor Gerrit J. Groothuis

Gerrit J. Groothuis 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: 4510687
    Abstract: There is provided a shaving apparatus comprising a shear plate with hair-entry apertures; and a cutting unit associated with and reciprocatory relative to the shear plate, the cutting unit including a frame. Cutters extend from the frame toward the shear plate, each cutter having a trapezoidal cross section and being in contact along its base with the shear plate. Two hair-pulling blades are respectively associated with and movable relative to the opposite sloping sides of each cutter, each hair-pulling blade normally being in contact with the shear plate. A pair of resilient elements respectively connects the opposite ends of each hair-pulling blade to the frame.
    Type: Grant
    Filed: December 27, 1982
    Date of Patent: April 16, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Gerrit J. Groothuis, Atze de Haan, Hendrik Poel, Eduard W. Tietjens, Jochem J. de Vries
  • Patent number: 4424628
    Abstract: A shaving apparatus comprising a shear plate and an associated reciprocatory cutting member is provided with cutting elements each of which is constituted by a filamentary cutter positioned along the outer edge of a lamelliform support.
    Type: Grant
    Filed: July 12, 1982
    Date of Patent: January 10, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Gerrit J. Groothuis, Eduard W. Tietjens
  • Patent number: 4275497
    Abstract: There is provided a shaving apparatus comprising a shear plate having hair entry apertures and a cutting unit associated with and drivable relative to the shear plate. The cutting unit comprises a cutting member having cutters extending toward the shear plate and respectively associated lead cutters movable relative to the cutters away from and toward the shear plate. The arrangement is such that each lead cutter is always maintained spaced from its associated cutter throughout their respective lengths regardless of their relative position.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: June 30, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Manfred Engelhardt, Jan Reinink, Jochem J. De Vries, Ferdinand M. Trees, Eduard W. Tietjens, Gerrit J. Groothuis
  • Patent number: 4259781
    Abstract: A shaving apparatus has a circular shear plate provided with hair-entry apertures and a cutting unit associated with and rotatable relative to the shear plate. The cutting unit comprises a cutting member having a circular central body provided with circumferentially arranged cutters and lead cutters respectively associated with and movable relative to the cutters. Each lead cutter is secured to the central body of the cutting member by a resilient connecting arm, the inner end portion of which extends substantially radially with respect to the cutting unit axis and undergoes torsion-loading by reason of the movement of the lead cutter away from the shear plate, the lead cutter being connected eccentrically to such inner end portion. The torsion-loading is elastically opposed in each instance.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: April 7, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Ebbe Boiten, Gerrit J. Groothuis, Jochem J. de Vries
  • Patent number: 4170822
    Abstract: A dry-shaving apparatus comprises a shear foil having hair entrance apertures and a cutting member movable relative to the shear foil and including a flexible cutter plate formed with lamellar cutting elements extending between two oppositely disposed edge portions of the cutter plate and separated from each other by slots. A regular pattern of openings formed in each edge portion of the cutter plate is so arranged that an opening is situated at the corresponding base of each lamellar cutting element.
    Type: Grant
    Filed: November 7, 1977
    Date of Patent: October 16, 1979
    Assignee: U.S. Philips Corporation
    Inventors: Gerrit J. Groothuis, Tjamme DE Vries