Patents by Inventor Ferdinand M. Trees

Ferdinand M. 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).

  • Patent number: 4343086
    Abstract: There is provided a shaving apparatus having a shear plate formed with hair entry apertures and a cutting unit rotatable relative to the shear plate. The cutting unit comprises a cutting member having a central body provided with cutters, a hair-pulling member having a central portion, hair-pulling elements respectively associated with and movable relative to the cutters, respective connecting arms extending from the hair-pulling elements to the central portion of the hair-pulling member, and an annular cover plate positioned over the inner ends of the connecting arms and engaging the central portion. The central body and the central portion each have a central opening, through both of which means formed on the cover plate extends for engaging the cutting member to secure the hair-pulling member between the cutting member and the cover plate.
    Type: Grant
    Filed: May 5, 1980
    Date of Patent: August 10, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Jochem J. de Vries, Ferdinand M. Trees
  • 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: 4261101
    Abstract: A shaving apparatus comprising a shear plate and an associated reciprocatory cutting member is provided with cutting elements each having a frusto-conical cross section and being in contact along its base with the shear plate, the opposite sloping sides of a cutting element each forming a guide face. A plurality of individual lead cutters is movable relative to an associated guide face, with such plurality of lead cutters being arranged in side-by-side relationship and engaging the guide face. The lead cutters respectively engaging opposite guide faces are disposed in pairs. Each lead cutter moreover is elastically loaded in the direction of the shear plate.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: April 14, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Eduard W. Tietjens, Ferdinand M. Trees