Patents by Inventor Leopold Hupfer

Leopold Hupfer 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 cis-2,6-dimethylmorpholine
    Patent number: 4212972
    Abstract: A process for the preparation of cis-2,6-dimethylmorpholine from trans-2,6-dimethylmorpholine by isomerization over a catalyst in the presence of hydrogen.
    Type: Grant
    Filed: May 18, 1979
    Date of Patent: July 15, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Norbert Goetz, Walter Himmele, Leopold Hupfer
  • Manufacture of N-alkylanilines
    Patent number: 4196147
    Abstract: N-Alkylanilines are obtained by alkylating anilines with alcohols in the absence of hydrogen under a pressure substantially higher than the autogenous pressure of the reaction mixture, at from 50.degree. to 250.degree. C., preferably in the presence of a fixed catalyst containing cobalt, nickel and copper.
    Type: Grant
    Filed: September 29, 1977
    Date of Patent: April 1, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Martin Decker, Herwig Hoffmann, Leopold Hupfer, Herbert Toussaint
  • Manufacture of 2-amino-1-alcohols
    Patent number: 4105669
    Abstract: Reaction of 1-hydroxy-2-ketones of the general formula R-- CO-- CH.sub.2 OH, where R is a short alkyl, with ammonia gives a new compound ##STR1## which on hydrogenation gives 2-amino-1-alcohols; the yield can be improved by carrying out the hydrogenation in the presence of ammonia.
    Type: Grant
    Filed: June 20, 1977
    Date of Patent: August 8, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Walter Himmele, Leopold Hupfer, Herbert Toussaint, Gerhard Paul
  • Manufacture of N-substituted tetrahydro-1,4-oxazines
    Patent number: 4068077
    Abstract: A new process for the manufacture of N-substituted tetrahydro-1,4-oxazines, also called morpholines, by conversion of N-substituted bis-(2-hydroxyalkyl)-amines in the presence of catalysts.
    Type: Grant
    Filed: July 22, 1976
    Date of Patent: January 10, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Norbert Goetz, Bernd Zeeh, Martin Decker, Leopold Hupfer, Herbert Toussaint
  • Manufacture of hexamethylene diamine
    Patent number: 3972938
    Abstract: A process for the catalytic hydrogenation of adiponitrile in the presence of ammonia, in which a portion of the reaction mixture is recycled and specific molar ratios of adiponitrile and ammonia are maintained.
    Type: Grant
    Filed: March 11, 1974
    Date of Patent: August 3, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: Dieter Voges, Leopold Hupfer, Siegfried Winderl, Karl Wilhelm Leonhard, Herwig Hoffmann