Patents by Inventor Albertus B. De Vries

Albertus B. De Vries 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).

  • Shadow mask of the nickel-iron type having specific composition
    Patent number: 5811918
    Abstract: A method of manufacturing a shadow mask of the nickel-iron type, in which an aperture-patterned sheet of a nickel-iron alloy comprising 35-37% by weight of Ni and less than 0.1% by weight of each constituent of the group of Mn, Cr and Si and at most 0.9% by weight of Co is given a thermal treatment for obtaining an ASTM grain number of .gtoreq.7, and the sheet thus obtained is given the desired shape of a shadow mask having a thermal expansion coefficient of .ltoreq.0.9.times.10.sup.-6 /.degree.C.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: September 22, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus H. M. Van Den Berg, Albertus B. De Vries
  • Method of manufacturing a shadow mask of the nickel-iron type
    Patent number: 5716252
    Abstract: A method of manufacturing a shadow mask of the nickel-iron type, in which an aperture-patterned sheet of a nickel-iron alloy comprising 35-37% by weight of Ni and less than 0.1% by weight of each constituent of the group of Mn, Cr and Si and at most 0.9% by weight of Co is given a thermal treatment for obtaining an ASTM grain number of .gtoreq.7, and the sheet thus obtained is given the desired shape of a shadow mask having a thermal expansion coefficient of .ltoreq.0.9.times.10.sup.-6 /.degree.C.
    Type: Grant
    Filed: November 6, 1996
    Date of Patent: February 10, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus H.M. Van Den Berg, Albertus B. De Vries