Patents by Inventor Raymond Le Bossenec

Raymond Le Bossenec 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 for the heat-treatment of steel and for the control of said treatment
    Patent number: 4108693
    Abstract: The invention relates to a method of and an installation for the heat treatment of steels, such as heating before hardening, annealing, and carburization, which heat treatment is carried out in a furnace in the presence of a protection or carbon-enrichment atmosphere which flows continuously through the furnace, the atmosphere being obtained by the mixture, before its introduction into the furnace, of a carrier gas including nitrogen and possibly hydrogen, and an active gas constituted by a hydrocarbon, the mixture containing at least 0.2% by volume of hydrocarbon.The active gas may be constituted by ethylene, ethane or acetylene and the treatment is carried out at a temperature between 850.degree. and 1050.degree. C.The installation includes a device for analyzing the atmosphere at the furnace outlet, this analyzer actuating a regulating valve for the inlet flow of active gas through a servo-mechanism, in dependence on the proportion of carbon in the treated steel.
    Type: Grant
    Filed: June 1, 1977
    Date of Patent: August 22, 1978
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Mathurin L'Hermite, Raymond Le Bossenec, Pierre Godart, Francois Pierrard
  • Method for the heat-treatment of steel and for the control of said treatment
    Patent number: 4035203
    Abstract: The invention relates to a method of and an installation for the heat treatment of steels, such as heating before hardening, annealing, carburization and carbo-nitridation, carried out in a furnace in the presence of a protection or carbon-enrichment atmosphere which flows continuously through the furnace, the atmosphere being obtained by the mixture, before its introduction into the furnace, of a carrier gas including nitrogen and possibly hydrogen, and an active gas constituted by a hydrocarbon, the mixture containing at least 0.2% by volume of hydrocarbon.The active gas may be constituted by ethylene, ethane or acetylene and the treatment is carried out at a temperature between 700.degree. and 1050.degree. C.The installation includes a device for analyzing the atmosphere at the furnace outlet, this analyzer actuating a regulating valve for the inlet flow of active gas through a servo-mechanism, in dependence on the proportion of carbon in the treated steel.
    Type: Grant
    Filed: December 19, 1974
    Date of Patent: July 12, 1977
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Mathurin L'Hermite, Raymond Le Bossenec, Pierre Godart, Francois Pierrard