Patents by Inventor Philippe Maitrepierre

Philippe Maitrepierre 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: 4726853
    Abstract: The invention concerns a strip or sheet of ferritic stainless steel of the following composition (% by weight):(C+N)<.060;Si<0.9;Mn<1;Cr=15 to 19;Mo<1;Ni<0.5;Ti<0.1;Cu<0.4;S<0.02;P<0.045;Zr=0.10 to 0.40, and 7(C+N).ltoreq.Zr.ltoreq.7(C+N)+0.15;Nb=0.25 to 0.55, in non-combined form;Al=0.020 to 0.080;Fe=the balance,in which Al is essentially in solid solution.The process for the production of the sheet or strip comprises a final annealing operation which is carried out at between 980.degree. and 1020.degree. C., typically for 0.5 to 5 minutes at between 990.degree. and 1010.degree. C.The strip or sheet according to the invention is used for any application requiring an economic compromise in regard to ductility (sheet and welds), hot resistance and resistance to corrosion, for example in motor vehicle exhaust manifolds.
    Type: Grant
    Filed: October 27, 1986
    Date of Patent: February 23, 1988
    Assignee: Ugine Gueugnon SA
    Inventors: Pascal Gressin, Pierre Pedarre, Jean Decroix, Philippe Maitrepierre
  • Patent number: 4474627
    Abstract: The invention relates to a method of making steel bars and tubes with good mechanical characteristics.The process consists of manufacturing a low alloy steel containing 0.06 to 0.12% carbon as well as additions with well-determined contents of Si, Mn, Nb, Al, B and optionally V. The steel is used in a raw state of hot rolling, optionally followed by tempering.The bars and tubes obtained in this manner are used for applications in which it is necessary to have a high elastic limit associated with high resistance.
    Type: Grant
    Filed: November 18, 1982
    Date of Patent: October 2, 1984
    Assignee: Ugine Aciers
    Inventors: Philippe Maitrepierre, Bernard Heritier, Jaime Rofes-Vernis, Alain Wyckaert