Patents by Inventor Alain Frichet

Alain Frichet 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 and device for checking and characteristics of a surface layer of a zirconium-alloy element and use for the checking of fuel rods for a nuclear reactor
    Patent number: 6099718
    Abstract: A sinusoidal voltage is appied to a zirconium alloy clad fuel rod. The current is measured and the impedance is determined to provide a check for the compactness and adhesion of an oxide surface layer on the fuel rod.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: August 8, 2000
    Assignee: Societe Franco-Belge de Fabrication de Combustible - FBFC
    Inventors: Dominique Duthoo, Fanjas Yves, Alain Frichet, Michel Ladet
  • Method for the optical alignment of designs in two near planes and alignment apparatus for performing this method
    Patent number: 4311389
    Abstract: The invention relates to the alignment of designs in two near planes, whereby one (the mask) carries a design which is to be reproduced on the second (the pattern).The invention relates to a method for the optical alignment of these two planes using a pair of marks formed by a lens (4) having linear Fresnel zones inscribed on the mask (1) and a reflecting grating (3) of appropriate width inscribed on the pattern (2). The illumination by a parallel beam of monochromatic light of the lens with Fresnel zones produces on the pattern a substantially rectangular illumination spot which, when made to coincide with the line inscribed on the pattern is reflected or transmitted, and supplies a detected intensity maximum or minimum depending on whether the lines reflects more or less than the remainder of the pattern. The invention also relates to an optical alignment apparatus for performing this method.
    Type: Grant
    Filed: September 13, 1979
    Date of Patent: January 19, 1982
    Assignee: Thomson-CSF
    Inventors: Bernard Fay, Jacques Trotel, Alain Frichet