Patents by Inventor Victor A. van der Hulst

Victor A. van der Hulst 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 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
  • Method of and device for drawing an optical fiber from a solid preform consisting substantially of SiO.sub.2 and doped SiO.sub.2
    Patent number: 4673427
    Abstract: Optical fibres are drawn from a solid preform which consists substantially of SiO.sub.2 and doped SiO.sub.2. After leaving the heating zone, the fiber is guided through a space having a laminar gas flow to restrict the temperature drop across the fiber so that no extra stresses are incorporated in the fiber upon cooling. A device for performing this method comprises a quartz pipe through which the fiber is guided and in which a laminar gas flow is maintained.
    Type: Grant
    Filed: September 28, 1983
    Date of Patent: June 16, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Aart A. Van Der Giessen, Victor A. Van Der Hulst, Petrus J. Janssen
  • Device for drawing an optical fibre
    Patent number: 4477274
    Abstract: An improved sealing of the inlet channel of a drawing furnace for optical fibres can be achieved by using one or more silicon rubber discs having an aperture whose diameter is smaller than that of the preform.Burning of the silicon rubber discs can be checked by a choice of the material for the discs having a refractive index smaller than that of the preform so that thermal radiation is not irradiated in the disc via the preform.The silicon rubber discs are further protected by a metal screening between the discs and the interior of the drawing furnace.
    Type: Grant
    Filed: September 14, 1983
    Date of Patent: October 16, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Petrus J. Janssen, Victor A. van der Hulst