Patents by Inventor Hans Joachim Szymanski

Hans Joachim Szymanski 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).

  • Continuous manufacture of N-alkylated arylamines
    Patent number: 3941844
    Abstract: N-alkylated arylamines are prepared by reaction of arylamines which have at least one hydrogen atom on the nitrogen, with olefins or cycloolefins which can have substituents which are inert under the reaction conditions, at temperatures from 180.degree. to 450.degree.C, in the presence of catalysts. The improvement is that silicic acid which contains from 0.1 to 30 percent by weight of phosphoric acids, based on silicic acid, is used as the catalysts and that catalytic amounts of water are employed. N-alkylated arylamines are starting materials for the manufacture of dyes, pesticides, plant protection agents and growth regulators, and can also be used as mineral oil additives.
    Type: Grant
    Filed: July 25, 1974
    Date of Patent: March 2, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans Joachim Szymanski, Toni Dockner