Patents by Inventor Hariolf Kottmann

Hariolf Kottmann 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).

  • Process for the preparation of 1,1-disubstituted cyclopropane derivatives
    Patent number: 5189165
    Abstract: A process for preparing a compound I ##STR1## with A=t-butyl, aryl andR=alkyl, alkenyl, alkynyl, alkenynyl, cycloalkyl(alkyl), aryl, arylalkyl, alkyl-S-(-O)-arylby reacting a compound III ##STR2## with a compound IV ##STR3## under the conditions of a phase-transfer reaction, is described. The process gives excellent yields and is not associated with the unpleasant odor of mercaptans.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: February 23, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Burdinski, Reinhard Kirsch, Hariolf Kottmann
  • Process for the preparation of perfluorinated ethers
    Patent number: 5091589
    Abstract: The invention relates to a process for the preparation of fluorinated ethers of the formula (I)F.sub.3 C(CF.sub.2).sub.2 --O--CF(CF.sub.3)CF.sub.2 --O).sub.n CHFCF.sub.3 (I)where n is an integer from 10 to 60, from the compounds of the formula(II)F.sub.3 C(CF.sub.2).sub.2 --O--CF(CF.sub.3)CF.sub.2 --O).sub.n CF(CF.sub.3)COF (II)where n has the above meaning, by reaction with alkali metal hydroxide at temperatures of 90.degree. to 160.degree. C. and in the absence of solvents.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: February 25, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Matthias Meyer, Ralf Stapel, Hariolf Kottmann, Thomas Gries