Patents by Inventor Robert Leveque

Robert Leveque 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).

  • Patent number: 5480683
    Abstract: A process for reducing the coefficient of friction and the wear between a metal part and an organic polymer- or copolymer-based part, in an aqueous medium containing chlorides, characterized in that the organic polymer- or copolymer-based part is submitted to a surface treatment by ionic implantation of elements selected from nitrogen, argon, oxygen and carbon.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: January 2, 1996
    Assignee: Nitruvid
    Inventors: Claude Chabrol, Marc Robelet, Robert Leveque, Anne L. M. Pichat nec Nedelec, Jean F. E. Rieu, Louis M. Rabbe, Andre Rambert
  • Patent number: 4823451
    Abstract: The roll is made from a low alloy steel having the following composition by weight : C: 0.76 to 0.92; Mn: 0.70 to 1.40; Si: 0.70 to 1.40; S.ltoreq.0.020; P.ltoreq.0.025; Ni.ltoreq.0.60; Cr: 1.50 to 2.20; Mo: 0.15 to 0.55; V: 0.08 to 0.25; Cu.ltoreq.0.50; the remainder being iron and accidental impurities.
    Type: Grant
    Filed: March 3, 1988
    Date of Patent: April 25, 1989
    Assignee: Chavanne Ketin
    Inventors: Joseph J. Terrasse, Michel Seux, Robert Leveque
  • Patent number: 4357182
    Abstract: A process for the chromization by gas of steels containing more than 0.2% of carbon, consisting of three successive treatments, the chromization treatment proper employing a cement having a ferrochrome base containing between 1% and 3% of carbon, and preferably 2%. The process is particularly useful in the chromization of structural and tool steels.
    Type: Grant
    Filed: April 29, 1981
    Date of Patent: November 2, 1982
    Assignee: Creusot-Loire
    Inventor: Robert Leveque
  • Patent number: 4242151
    Abstract: The object of the present invention is an improvement in chromizing methods, constituted by a method of chromizing steels to a depth e greater than 30 microns, usable for steels with a carbon content of at least 0.2%, especially for steels for construction work and steels for tools, characterized by the combination of three successive treatments, the first of these three treatments consisting of an ionic nitriding of a surface layer between 100 and 350 microns thick, this ionic nitriding being realized in an atmosphere constituted by a mixture of nitrogen and hydrogen, at a temperature of between 450.degree. C. and 650.degree. C., for between 5 and 40 hours, so as to obtain between 1.5% and 2.5% nitrogen in the nitrided layer, the second of these treatments consisting of a chromizing by gaseous method forming chromium carbides, lasting between 5 and 30 hours, and realized at temperatures of between 850.degree. C. and 1,100.degree. C.
    Type: Grant
    Filed: October 24, 1979
    Date of Patent: December 30, 1980
    Assignee: Creusot-Loire
    Inventor: Robert Leveque