Patents by Inventor Lhopital Michel

Lhopital Michel 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).

  • Sulphur-containing additives to lubricants with antiwear and extreme-pressure effect and the processes for their preparation and compositions containing the said additives
    Patent number: 5062977
    Abstract: This invention relates to additives to lubricants with antiwear and extreme-pressure effect consisting of asymmetric dihydrocarbyl polysulphides containing a hydrocarbyl polysulphide group R-S.sub.x - in a vicinal position of a secondary or tertiary alcohol, and to lubricating compositions containing these additives. The additives are prepared by reaction of a basic salt of a hydrocarbyl (poly)sulphide either with a compound containing at least one epoxy group or with an alpha-hydroxylated organic thiosulphate.
    Type: Grant
    Filed: May 14, 1990
    Date of Patent: November 5, 1991
    Assignee: Elf France
    Inventors: Laurent Germanaud, Patrick Azorin, Lhopital Michel