Patents by Inventor Roger Duet

Roger Duet 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).

  • Resulphurized austenitic stainless steel with improved machinability
    Patent number: 5089224
    Abstract: Resulphurized austenitic stainless steel with improved machinability, characterized in that its weight composition is the following:carbon lower than or equal to 0.15%silicon lower than or equal to 2%manganese lower than or equal to 2%molybdenum lower than or equal to 3%nickel between 7 and 12%chromium between 15 and 25%sulphur between 0.10 and 0.40%calcium higher than or equal to 30.times.10.sup.-4 %oxygen higher than or equal to 70.times.10.sup.-4 %the ratio of the calcium content and of the oxygen content Ca/O being between 0.2 and 0.6.
    Type: Grant
    Filed: June 13, 1990
    Date of Patent: February 18, 1992
    Assignee: Ugine Savoie
    Inventors: Olivier Bletton, Roger Duet, Marc Henry, Jean-Yves Cogne