Patents by Inventor Reinhard Zell

Reinhard Zell 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 manufacture of cyclohexene derivatives
    Patent number: 4579973
    Abstract: A novel process for the manufacture of cyclohexene derivatives which are suitable as intermediates for the manufacture of rhodoxanthin or zeaxanthin, as well as a process for the manufacture of rhodoxanthin or of zeaxanthin itself. The invention is also concerned with a novel starting material and novel intermediates in this process.
    Type: Grant
    Filed: February 8, 1985
    Date of Patent: April 1, 1986
    Assignee: Hoffman-La Roche Inc.
    Inventors: Erich Widmer, Reinhard Zell
  • Process for the manufacture of cyclohexene derivatives
    Patent number: 4405417
    Abstract: A process for the manufacture of the novel compound of the formula ##STR1## from the compound of the formula ##STR2## is described. This process comprises cathodically reducing the compound of formula I in a basic, aqueous-organic solvent mixture.The compound of formula II is an intermediate in the manufacture of rhodoxanthin or zeaxanthin.
    Type: Grant
    Filed: January 17, 1983
    Date of Patent: September 20, 1983
    Assignee: Hoffmann- La Roche Inc.
    Inventors: Hansjorg Grass, Reinhard Zell
  • Process for producing cyclohexenes
    Patent number: 4323711
    Abstract: A process for producing 3-(5-hydroxy-3-methyl-1,3-pentadienyl)-2,4,4-trimethyl-2-cyclohexen-1-one, an intermediate for canthaxanthin, by hydrogenation of 5-(2,6,6-trimethyl-3-oxo-cyclohexen-1-yl)-3-methyl-2-penten-4-yn-1-ol with zinc and a carboxylic acid.
    Type: Grant
    Filed: November 10, 1980
    Date of Patent: April 6, 1982
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Teodor Lukac, Erich Widmer, Reinhard Zell
  • Process for the manufacture of tertiary, optically active aliphatic compounds
    Patent number: 4305876
    Abstract: A process for asymmetrically hydrogenating through the use of microorganisms a double bond connected to tertiary carbon atom in an olefinic aliphatic compound to produce a tertiary, optically active aliphatic compound useful as an intermediate for optically active Vitamins E and K.
    Type: Grant
    Filed: November 24, 1978
    Date of Patent: December 15, 1981
    Assignee: Hoffmann-La Roche, Inc.
    Inventors: Richard Barner, Walter Boguth, Hans G. W. Leuenberger, Max Schmid, Reinhard Zell
  • Process for the manufacture of cyclohexene derivatives
    Patent number: 4283559
    Abstract: The compound 6-hydroxy-3-(5-hydroxy-3-methyl-1,3-pentadienyl)-2,4,4-trimethyl-2-cyclohe xen-1-one useful as intermediate for producing the natural coloring agent astaxanthin as well as a method for synthesizing astaxanthin from this compound and synthesizing the compound from 2-hydroxyketo isophorone.
    Type: Grant
    Filed: May 21, 1979
    Date of Patent: August 11, 1981
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Emil A. Broger, Yvo Crameri, Hans G. W. Leuenberger, Erich Widmer, Reinhard Zell
  • Optically active cyclohexane derivatives
    Patent number: 4156100
    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: November 7, 1977
    Date of Patent: May 22, 1979
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Walter Boguth, Hans G. W. Leuenberger, Hans J. Mayer, Erich Widmer, Reinhard Zell
  • Process for the manufacture of tertiary, optically active aliphatic compounds
    Patent number: 4138289
    Abstract: A process for asymmetrically hydrogenating through the use of microorganisms a double bond connected to tertiary carbon atom in an olefinic aliphatic compound to produce a tertiary, optically active aliphatic compound useful as an intermediate for optically active Vitamins E and K.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: February 6, 1979
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Richard Barner, Walter Boguth, Hans G. W. Leuenberger, Max Schmid, Reinhard Zell
  • Optically active cyclohexane derivatives
    Patent number: 4095038
    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: June 13, 1978
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Walter Boguth, Hans Georg Wilhelm Leuenberger, Hans Johann Mayer, Erich Widmer, Reinhard Zell
  • Optically active cyclohexane derivatives
    Patent number: 4072715
    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: February 7, 1978
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Walter Boguth, Hans G. W. Leuenberger, Hans J. Mayer, Erich Widmer, Reinhard Zell
  • 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
  • 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