Patents by Inventor Cornelis J. Jorna

Cornelis J. Jorna 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: 6145200
    Abstract: A shaving apparatus having an external cutting member and an internal cutting member, which is rotationally drivable with respect to said external cutting member, which internal cutting member is supported on the external cutting member both by an axial and a radial bearing means, the internal cutting member being in axially interlocking engagement with the external cutting member, the internal cutting member and the external cutting member, the shaving apparatus further having a drive member for driving the internal cutting member. In operation, in order to minimize the frictional losses between the internal and the external cutting member, the drive member exerts on the internal cutting member exclusively a force for rotationally driving the internal cutting member, while the drive member does not exert any axial force on the internal cutting member.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: November 14, 2000
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis J. Jorna, Johannes A. M. Van Hout
  • Patent number: 6085421
    Abstract: A shaving apparatus having an external cutting member and an internal cutting member, which is rotationally drivable with respect to said external cutting member, which external cutting member is formed with a circular groove having a bottom wall and an upright inner and outer wall, the bottom wall and the outer wall having at least a plurality of slit-shaped hair-entry apertures oriented substantially radially, the inner wall and a small part of the adjoining bottom wall further forming an uninterrupted guard wall which precludes the entry of hairs. To improve the hair-catching performance the guard wall has grooves which are oriented substantially radially and which are disposed in line with the slit-shaped hair-entry apertures.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: July 11, 2000
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis J. Jorna, Fokke R. Voorhorst