Patents by Inventor Petrus F. De Jongh

Petrus F. De Jongh 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).

  • Molding device comprising microwave generator and a microwave oven
    Patent number: 5653778
    Abstract: A device for molding products made of glass or a synthetic resin which device has a microwave generator, a microwave oven coupled to the generator and mold parts movable relative to each other provided in the microwave oven for forming molds for holding a parison of the glass or synthetic resin to be heated dielectrically.
    Type: Grant
    Filed: March 25, 1996
    Date of Patent: August 5, 1997
    Assignee: U.S. Philips Corporation
    Inventors: Peter C. S. Rutjes, Petrus F. De Jongh
  • Method of moulding products with heating a parison with microwaves
    Patent number: 5324345
    Abstract: A method and a device for moulding products made of glass or synthetic resin is provided, whereby a parison of material (3) is heated by microwave heating up to a predetermined temperature and is then moulded into the desired product shape by moulds (5, 7). The method and device are particularly suitable for manufacturing optical products such as lenses, prisms, and gratings.
    Type: Grant
    Filed: December 8, 1992
    Date of Patent: June 28, 1994
    Assignee: U.S. Philips Corporation
    Inventors: Peter C. S. Rutjes, Petrus F. De Jongh, Victor A. Van Der Hulst, Franciscus M. A. Rademakers
  • Plasma activated deposition of an insulating material on the interior of a tube
    Patent number: 4877938
    Abstract: In the internal coating of a tube of an electrically insulating material by a second electrically insulating material by reactive deposition of the second electrically insulating material from a gas mixture which is passed through the tube, the desposition is activated by a plasma which is produced by microwaves and is reciprocated in the tube. A method with low energy consumption and a device of a simple construction are made possible in that the plasma is excited by TE 011 resonance in a cylindrical resonator.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: October 31, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Hans Rau, Petrus F. De Jongh