Patents by Inventor Dirk J. Van Hemmen

Dirk J. Van Hemmen 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: 4262416
    Abstract: A shaving apparatus includes a cutting member substantially constituted by a central body provided at its circumference with cutters connected to the central body by means of connecting arms. For reasons of manufacturing technology and cost the material thickness is desirable minimized. However, limiting factors in this respect are the strength and the rigidity of the cutting member. In the instant construction the strength and the rigidity of the cutting member are increased by having the connecting arms secured to a bent reinforcement rim at the periphery of the central body.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: April 21, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Dirk J. Van Hemmen, Jan Reinink, Jochem J. de Vries
  • Patent number: 4227301
    Abstract: There is provided a rotary shaving apparatus having a shear plate formed with hair-entrance apertures and a cutting member associated with and rotatable relative to the shear plate. The cutting member is substantially constituted by a central body provided with cutters extending only from its circumference. The cutters are arranged in a plurality of groups, the intervals between adjoining cutters of each group being equal, such intervals differing from the respective intervals between the two adjacent cutters of two different groups.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: October 14, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Dirk J. Van Hemmen, Albert Hoekstra
  • Patent number: D257744
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: December 30, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Dirk J. van Hemmen, Jochem J. De Vries