Patents by Inventor Jan Spoelstra

Jan Spoelstra 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: 8186064
    Abstract: Shaving apparatus with cutting members which are movable relative to one another and are each provided with a row of substantially V-shaped teeth having edges, a cutting opening between each pair of cooperating teeth for catching hairs, said cutting opening having a shearing angle between 1° and 30°, wherein the cutting openings are not completely closed during operation of the shaving apparatus.
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: May 29, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Johan Pragt, Fokke Roelof Voorhorst, Jan Spoelstra, Alastair Ian Blake, Bastiaan Johannes De Wit, Jasper Zuidervaart, Albert Maas De Lange, Anna Dirkje Bosma
  • Publication number: 20070209211
    Abstract: Shaving apparatus with cutting members (3, 5) which are movable relative to one another other and are each provided with a row of substantially V-shaped teeth (4, 6) having edges (7, 8), a cutting opening (9?, 9?) between each pair of cooperating teeth (4, 6) for catching hairs, said cutting opening having a shearing angle between 1° and 30°, wherein the cutting openings (9?, 9?) are not completely closed during operation of the shaving apparatus.
    Type: Application
    Filed: March 18, 2005
    Publication date: September 13, 2007
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Johan Pragt, Fokke Voorhorst, Jan Spoelstra, Alastair Blake, Bastiaan De Wit, Jasper Zuidervaart, Albert De Lange, Anna Bosma
  • Patent number: 6926370
    Abstract: A method of manufacturing a composite wheel. The wheel is composed by mats of oriented carbon fibers. The mats are impregnated with a synthetic resin. The wheel is composed of at least two portions previously built up, which form respectively the hub and the rim of the wheel. The rim portion can, viewed from a direction perpendicular to the central axis, have a section substantially symmetric relative to a central plane of symmetry, the distance measured from a side of the section facing the central axis to the central axis predominantly increasing in the direction pointing away from the mirror plane, and the hub portion having a correspondingly comically shaped outer edge, which fittingly lies against the side of the rim portion facing the central axis over a substantial distance.
    Type: Grant
    Filed: September 3, 2001
    Date of Patent: August 9, 2005
    Assignee: Prins Dokkum B.V.
    Inventor: Jan Spoelstra
  • Publication number: 20030189373
    Abstract: A method of manufacturing a composite wheel. The wheel is composed by mats of oriented carbon fibers. The mats are impregnated with a synthetic resin. The wheel is composed of at least two portions previously built up, which form respectively the hub and the rim of the wheel. The rim portion can, viewed from a direction perpendicular to the central axis, have a section substantially symmetric relative to a central plane of symmetry, the distance measured from a side of the section facing the central axis to the central axis predominantly increasing in the direction pointing away from the mirror plane, and the hub portion having a correspondingly comically shaped outer edge, which fittingly lies against the side of the rim portion facing the central axis over a substantial distance.
    Type: Application
    Filed: June 2, 2003
    Publication date: October 9, 2003
    Inventor: Jan Spoelstra
  • Patent number: 6574866
    Abstract: A hair removing apparatus (1) comprising two co-operating hair processing members (17, 19), formed by plate-shaped carriers and movable relatively to each other in a direction of movement (X). The two carriers are positioned with respect to each other, viewed in a Z direction substantially perpendicular to the carriers, by a plurality of positioning members (29), which are spaced apart in the direction of movement. At least one of the two carriers has a comparatively low bending stiffness. As a result, a comparatively small and uniform gap is present between the two carriers, and the friction force acting on the carriers in a direction parallel to the direction of movement is also comparatively small. In one embodiment the positioning members (29) each have an S-shaped or C-shaped tongue (31), which is provided on a third carrier (35), the first and second carriers (21, 27) being enclosed between the third carrier and contact elements (41) of the tongues.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: June 10, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Johan Pragt, Robert Alexander Santhagens Van Eibergen, Jan Spoelstra, Fokke Roelof Voorhorst, Jasper Zuidervaart, Martijn Adriaan De Keijzer, Arjan Sander Vonk, Foppe Kramer
  • Publication number: 20020020063
    Abstract: The invention relates to a hair removing apparatus (1) comprising two cooperating hair processing members (17, 19), which are movable relatively to each other in a direction of movement (X). The hair processing members comprise, respectively, a first plate-shaped carrier (21) and a second plate-shaped carrier (27), which extend substantially parallel to the direction of movement. The two carriers are positioned with respect to each other, viewed in a Z direction substantially perpendicular to the carriers, by means of a plurality of positioning members (29), which are arranged so as to be some distance apart, viewed in a direction parallel to the direction of movement. At least one of the two carriers has a comparatively low bending stiffness. As a result, a comparatively small and uniform gap is present between the two carriers, and the friction force acting on the carriers in a direction parallel to the direction of movement is also comparatively small.
    Type: Application
    Filed: June 21, 2001
    Publication date: February 21, 2002
    Inventors: Johan Pragt, Robert Alexander Santhagens Van Eibergen, Jan Spoelstra, Fokke Roelof Voorhorst, Jasper Zuidervaart, Martijn Adriaan De Keijzer, Arjan Sander Vonk, Foppe Kramer