Patents by Inventor Carl R. Kessel

Carl R. Kessel 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).

  • Photopolymerizable compositions and photoinitiators therefor
    Patent number: 5086192
    Abstract: Disclosed are siloxanyl-substituted diaromatic iodonium salts such as 4-[3-1,1,3,3,5,5,5-heptamethyl siloxanyl propoxy]phenyl-phenyliodonium hexafluoroantimonate. These diaryl iodonium salts are useful as photoinitiators for epoxy containing compounds, especially epoxypolysiloxanes. Also disclosed is a process for the preparation of a siloxanyl-substituted diaromatic iodonium salt.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: February 4, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Carl R. Kessel, Tracy R. Woodward
  • Silicone release compositions
    Patent number: 4822687
    Abstract: A composite structure comprises a substrate bearing on one or more surfaces a layer comprising an epoxypolysiloxane in which greater than 20% of the siloxane units are substituted by an oxiranyl group-substituted monovalent, non-cyclic, linear or branched aliphatic group. The composite structures can be adhesive roll and sheet materials in which the novel layer is a release coating.
    Type: Grant
    Filed: January 22, 1988
    Date of Patent: April 18, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Carl R. Kessel, Stephen W. Bany
  • Cycloadduct precursors of cantharidin and method
    Patent number: 4298752
    Abstract: Novel cycloadducts are provided which may be formed between furan and 2,5-dihydrothiophene-3,4-dicarboxylic anhydride at elevated pressure. One of these cycloadducts is useful in a synthesis of cantharidin. Another yields a novel isomeric cantharidin.
    Type: Grant
    Filed: September 19, 1980
    Date of Patent: November 3, 1981
    Assignee: Regents of the University of California
    Inventors: William G. Dauben, Carl R. Kessel, Kazuo H. Takemura