Patents by Inventor Adriaan J. G. Op Het Veld

Adriaan J. G. Op Het Veld 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 manufacturing a die for duplicating plastics information carriers
    Patent number: 4440586
    Abstract: The invention relates to a method of reproducing plastics record carriers, in particular duplicating video records. According to the invention, a metal die is used which is provided with a thin-liquid molding resin of a particular composition which can be polymerized by radiation. A radiation-pervious substrate which is manufactured from synthetic material, for example polymethylmethacrylate, is provided on the molding resin. The molding resin is exposed to light via the substrate after which the cured molding resin together with the substrate connected thereto is removed from the die. The molding resin used in the process comprises low-molecular monomers or oligomers which contain on an average 25-70% by weight of hydrocarbon groups and/or phenyl groups. The molding resin is aprotic and has a functionality as regards unsaturatedness which is between the values 2 and 6. A suitable molding resin contains mono-, tri- or tetra esters of acrylic acid.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: April 3, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus J. M. Lippits, Arnoldus J. M. Van Den Broek, Adriaan J. G. Op Het Veld, Rinse Dijkstra, Jelis De Jonge
  • Method of producing a drawing die
    Patent number: 4392397
    Abstract: The disclosure relates to the manufacture of wire-drawing dies. The disclosure provides a method for securing a core in a metal housing. The method begins with the clamping of an annulus, consisting of a hardenable metal alloy, around a cylindrical core consisting of a material such as polycrystalline diamond or boron nitride. The core is clamped so as to produce a permanent, radially compressive stress therein. The core-annulus combination is secured in a metal housing of a conventional shape.
    Type: Grant
    Filed: June 19, 1980
    Date of Patent: July 12, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus R. C. Engelfriet, Adriaan J. G. Op Het Veld, Theodorus J. P. Van Vucht
  • Method of duplicating plastics information carriers
    Patent number: 4275091
    Abstract: The invention relates to a method of reproducing plastics record carriers, in particular duplicating video records. According to the invention, a metal die is used which is provided with a thin-liquid molding resin of a particular composition which can be polymerized by radiation. A radiation-pervious substrate which is manufactured from synthetic material, for example polymethylmethacrylate, is provided on the molding resin. The molding resin is exposed to light via the substrate after which the cured molding resin together with the substrate connected thereto is removed from the die. The molding resin used in the process comprises low-molecular monomers or oligomers which contain on an average 25-70% by weight of hydrocarbon groups and/or phenyl groups. The molding resin is aprotic and has a functionality as regards unsaturatedness which is between the values 2 and 6. A suitable molding resin contains mono-, tri- or tetra esters of acylic acid.
    Type: Grant
    Filed: November 16, 1979
    Date of Patent: June 23, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus J. M. Lippits, Arnoldus J. M. Van Den Broek, Adriaan J. G. Op Het Veld, Rinse Dijkstra, Jelis De Jonge