Patents by Inventor Ernst Hille

Ernst Hille 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 benzimidazolone-(2)
    Patent number: 4269989
    Abstract: Benzimidazolone-(2) is obtained in good yield and high purity when o-phenylene diamine is condensed with urea in water at a pH of 4 to 9 and a temperature above 90.degree. C.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: May 26, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Heise, Ernst Hille, Reinhard Wagner, Kurt Kummerle
  • Process for the manufacture of 3-hydroxybutyric acid arylamides with trialkyl phosphate and substituted phosphine promotor
    Patent number: 4128578
    Abstract: The liquid-phase catalytic hydrogenation of N-acetoacetyl arylamides to yield 3-hydroxybutyric acid arylamides proceeds much faster when amines, phosphines or trialkylphosphates are added. Thus, even with lower hydrogen pressures and at lower temperatures with a lower catalyst concentration, shorter reaction times are sufficient.
    Type: Grant
    Filed: March 8, 1977
    Date of Patent: December 5, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Kurt Kummerle, Hartmut Heise, Ernst Hille
  • Process for the preparation of 5-acetoacetylamino-benzimidazolone
    Patent number: 4087610
    Abstract: 5-Acetoacetylamino benzimidazolone-(2) is obtained in high yield and excellent purity by reacting diketene with the aqueous solution of a salt of 5-amino-benzimidazolone-(2) and an acid having a pKa value of 1 to 7, preferably in the presence of an antioxidant and/or a reducing agent.
    Type: Grant
    Filed: April 27, 1976
    Date of Patent: May 2, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wilfried Sahm, Ernst Hille, Wolfgang Schiller
  • Process for preparing 4-chloro-2,5-dimethoxy aniline
    Patent number: 4082803
    Abstract: The catalytic hydrogenation of 4-chloro-2,5-dimethoxy nitrobenzene can be performed in water with a nickel catalyst if the average particle size is below 0.1 mm. The resulting aniline is reacted with diketene and the so-obtained N-acetoacetyl derivative is an azoic coupling component.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: April 4, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Emmerich Paszthory, Bernhard Mees, Ernst Hille
  • Process for the preparation of N-acetoacetyl-2,5-dimethoxy-4-chloroanilide
    Patent number: 4042622
    Abstract: N-acetoacetyl-2,5-dimethoxy-4-chloroanilide is obtained in high yield and purity by suspending 2,5-dimethoxy-4-chloroaniline in water and adding the complete amount of diketene necessary altogether at the beginning of the reaction. The product is obtained in a purity allowing its use as an azoic coupling component without purification.
    Type: Grant
    Filed: April 27, 1976
    Date of Patent: August 16, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Emmerich Paszthory, Ernst Hille, Karl-Gerhard Seifert, Vincenz Zimmermann