Patents by Inventor Erich Widmer

Erich Widmer 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).

  • Optically active cyclohexane derivatives
    Patent number: 4026949
    Abstract: A process for fermentatively hydrogenating and reducing ketoisophorone to produce optically active [4R,6R]-4-hydroxy-2,6,6-trimethyl-cyclohexanone useful as an intermediate in the production of optically active carotenoids and intermediates in the production of these carotenoids.
    Type: Grant
    Filed: July 20, 1976
    Date of Patent: May 31, 1977
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Walter Boguth, Hans Georg Wilhelm Leuenberger, Hans Johann Mayer, Erich Widmer, Reinhard Zell
  • Process for the manufacturing of oxo compounds
    Patent number: 4005145
    Abstract: A process for isomerizing .alpha., .beta.-unsaturated oxo compounds to the corresponding .beta., .gamma.-unsaturated oxo compound utilizing a weak acid as catalyst.
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: January 25, 1977
    Assignee: Hoffmann-La Roche Inc.
    Inventor: Erich Widmer
  • Optically active cyclohexane derivatives
    Patent number: 3988205
    Abstract: A process for fermentatively hydrogenating and reducing ketoisophorone to produce optically active [4R,6R]-4-hydroxy-2,6,6-trimethyl-cyclohexanone useful as an intermediate in the production of optically active carotenoids and intermediates in the production of these carotenoids.
    Type: Grant
    Filed: August 4, 1975
    Date of Patent: October 26, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Walter Boguth, Hans Georg Wilhelm Leuenberger, Hans Johann Mayer, Erich Widmer, Reinhard Zell
  • Ketoisophorone manufacture
    Patent number: 3960966
    Abstract: A process for the manufacture of ketoisophorone by the oxidation of .alpha.-isophorone employing oxygen gas in the presence of a catalyst.
    Type: Grant
    Filed: June 19, 1975
    Date of Patent: June 1, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Erich Widmer, Marcel Seuret
  • Process for the production of malonic acid dinitrile
    Patent number: 3936486
    Abstract: The process for the production of malonic acid dinitrile which includes quickly preheating acetonitrile to a temperature between 110.degree. and 700.degree.C. Cyanogen chloride and the preheated acetonitrile, both in the gaseous state, are reacted at a temperature between 700.degree. and 1200.degree.C. Malonic acid dinitrile, in the gaseous state, results. The reaction product mixture of gaseous malonic acid dinitrile, gaseous cyanogen chloride, gaseous acetonitrile and HCl, a reaction byproduct, is chilled with liquid reaction product mixture to a temperature between 40.degree.C. and the boiling point of the reaction product mixture. A liquid reaction product results. Simultaneously with the chilling step, the exhaust gas resulting from the chilling of the reaction product mixture is distilled or refined to separate the cyanogen chloride and acetonitrile from the HCl component in the exhaust gas. The malonic acid dinitrile is isolated from the liquid reaction product mixture and purified.
    Type: Grant
    Filed: October 18, 1974
    Date of Patent: February 3, 1976
    Assignee: Lonza Ltd.
    Inventors: Alfons Egger, Erich Widmer, Adriano Faucci, Rolf Gregorin