Patents by Inventor Bruce C. Oxenrider

Bruce C. Oxenrider 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).

  • N-Methylpyrrolidone solvent in esterification of carboxybenzenes
    Patent number: 4321403
    Abstract: An anhydride of a carboxybenzene is esterified in solution by a fluorinated alcohol, using N-methylpyrrolidone solvent. In particular, pyromellitic dianhydride in N-methylpyrrolidone solvent is esterified to the diester/diacid by 2-(n-perfluoroalkyl)ethanols having six to twelve carbon atoms in the perfluoroalkyl groups, and the reaction mixture containing the dissolved diester/diacid is admixed with an oxirane compound of the group ethylene oxide, epichlorohydrin and glycidol whereby the carboxyl groups are esterified in the N-methylpyrrolidone solvent by reaction with oxirane groups.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: March 23, 1982
    Assignee: Allied Corporation
    Inventors: Bruce C. Oxenrider, Frank Mares