Patents by Inventor Jean L. Le Coent

Jean L. Le Coent 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).

  • Methods for preparing normal and overbased phenates
    Patent number: 5529705
    Abstract: Processes for preparing normal and overbased calcium sulfurized alkylphenates. The processes are characterized by a sulfurization reaction using a lower carboxylic acid catalyst which does not use a polyol promoter, e.g., ethylene glycol. The process affords a calcium sulfurized phenate product which is essentially free of polyol oxidation products. The products are useful as additives for lubricating oils.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: June 25, 1996
    Assignee: Chevron Chemical Company
    Inventors: Vernon R. Small, Jr., William W. Willis, Jr., Jean L. Le Coent