Patents by Inventor Robert A. Prokop

Robert A. Prokop 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).

  • Preparation of hexafluoropropene oligomers
    Patent number: 5254774
    Abstract: A process for the oligomerization of hexafluoropropene comprises contacting hexafluoropropene with a catalyst or a mixture of catalysts selected from the group consisting of the cyanide, cyanate, and thiocyanate salts of alkali metals, quaternary ammonium, and quaternary phosphonium, in the presence of polar, aprotic solvent, e.g., acetonitrile. The process of the invention is especially useful for selectively preparing hexafluoropropene dimers, e.g., perfluoro-2-methyl-2-pentene and perfluoro-2-methyl-3-pentene, in good yield by the proper choice of solvent and catalyst.
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: October 19, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert A. Prokop
  • Detection of articles
    Patent number: 4469623
    Abstract: Vapor permeable microcapsules filled with volatile perfluoroalkyl bromide and used to tag articles for the detection thereof.
    Type: Grant
    Filed: August 24, 1983
    Date of Patent: September 4, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard D. Danielson, Robert A. Prokop
  • Tagging with microcapsules containing perfluoroalkyl pentafluorosulfide
    Patent number: 4399226
    Abstract: Vapor permeable microcapsules filled with volatile perfluoroalkyl pentafluorosulfide and used to tag articles for the detection thereof.
    Type: Grant
    Filed: August 31, 1981
    Date of Patent: August 16, 1983
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard D. Danielson, Robert A. Prokop
  • Microcapsules containing perfluoroalkyl pentafluorosulfide
    Patent number: 4306993
    Abstract: Vapor permeable microcapsules filled with volatile perfluoroalkyl pentafluorosulfide and used to tag articles for the detection thereof.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: December 22, 1981
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard D. Danielson, Robert A. Prokop