Patents by Inventor Friedhelm Kluge

Friedhelm Kluge 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).

  • Patent number: 4136121
    Abstract: Perfluorocarboxylic acid salts of a monovalent metal are reacted with perfluorocarboxylic acid fluorides in aprotic polar solvents. Perfluoroketones are obtained.The salt of the perfluorocarboxylic acid can be replaced by alkali metal salts of formic acid, oxalic acid or of oxygen-containing mineral acids, the central atom of which is an element of the groups IIIA to VIIA of the periodic table and which mineral acid is weaker than trifluoroacetic acid. The same result is obtained if the anhydride of the perfluorocarboxylic acid is contacted with an alkali metal fluoride. The synthesized perfluoroketones are liquids of high chemical and thermal stability.
    Type: Grant
    Filed: October 20, 1977
    Date of Patent: January 23, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Thomas Martini, Friedhelm Kluge
  • Patent number: 3985810
    Abstract: Perfluorinated ethers containing carboxylic acid fluoride groups and optionally units derived from hexafluoropropene epoxide or tetrafluoroethylene epoxide are reacted with fluorine at temperatures of from to in the presence of metallic catalysts. During the reaction carbonyl difluoride is splitt off and an ether is obtained in high yield which is free of carboxylic acid fluoride groups. Metallic silver is well suited as catalyst.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: October 12, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Sigmar-Peter von Halasz, Friedhelm Kluge