Patents by Inventor Hans C. de Willigen

Hans C. de Willigen 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).

  • Method of pressing an article of a thermoplastic material and apparatus for manufacturing an article of a thermoplastic material by pressing
    Patent number: 4632689
    Abstract: The invention relates to a method and apparatus for pressforming an article of a thermoplastic material. In accordance with the method a charge of molten material is deposited in a mould (14) and the central axis of a pressing plunger (18) and the mould (14) are aligned, after high a pressing operation is performed, the alignment being interrupted just before the end of the pressing operation. The apparatus comprises a frame (2), a mould (14) and a plunger (18), which plunger (18) is connected to a guide mechanism (22) which is movably connected to the frame (2) and which can be coupled rigidly to the mould (14) by coupling means (52).
    Type: Grant
    Filed: March 20, 1986
    Date of Patent: December 30, 1986
    Assignee: U.S. Philips Corporation
    Inventors: Hans C. De Willigen, Willem van der Hoek, Piet C. J. van Rens
  • Rectilinear guide comprising first and second members which are movable one within the other
    Patent number: 4555148
    Abstract: A rectilinear guide comprises a first member with a second member coaxially movable in the first member. One of the members comprises bearing elements and the other member comprises axial guide surfaces on which the bearing elements are movable, and which are disposed in planes containing the coinciding central axes of the two members.
    Type: Grant
    Filed: November 28, 1984
    Date of Patent: November 26, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Hans C. de Willigen, Johannes E. Kokken