Patents by Inventor Felix Roessler

Felix Roessler 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).

  • Manufacture of thiolactones
    Patent number: 7935829
    Abstract: The present invention relates to a process for the manufacture of cyclic thio esters (thiolactones) and related compounds by hydrogenation of cyclic thioanhydrides in the presence of metal catalysts.
    Type: Grant
    Filed: April 12, 2006
    Date of Patent: May 3, 2011
    Assignee: DSM IP Assets B.V.
    Inventors: Werner Bonrath, Reinhard Karge, Felix Roessler
  • Manufacture of lactones
    Patent number: 7803952
    Abstract: The present invention relates to a process for the manufacture of cyclic monocarboxylic esters (lactones) and related compounds by hydrogenation of cyclic dicarboxylic acid anhydrides in the presence of metal catalysts.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: September 28, 2010
    Assignee: DSM IP Assets B.V.
    Inventors: Werner Bonrath, Reinhard Karge, Felix Roessler
  • Manufacture of Thiolactones
    Publication number: 20090048455
    Abstract: The present invention relates to a process for the manufacture of cyclic thio esters (thiolactones) and related compounds by hydrogenation of cyclic thioanhydrides in the presence of metal catalysts.
    Type: Application
    Filed: April 12, 2006
    Publication date: February 19, 2009
    Inventors: Werner Bonrath, Reinhard Karge, Felix Roessler
  • Manufacture of Lactones
    Publication number: 20090043106
    Abstract: The present invention relates to a process for the manufacture of cyclic monocarboxylic esters (lactones) and related compounds by hydrogenation of cyclic dicarboxylic acid anhydrides in the presence of metal catalysts.
    Type: Application
    Filed: April 7, 2006
    Publication date: February 12, 2009
    Inventors: Werner Bonrath, Reinhard Kargo, Felix Roessler
  • Modification of a hydrogenation catalyst
    Patent number: 6521564
    Abstract: A process for the modification of a hydrogenation catalyst of the Raney nickel, Raney cobalt, nickel-on-carrier or cobalt-on-carrier type, which process includes treating the hydrogenation catalyst at temperatures of about 0° C. to about 120° C. with carbon monoxide, carbon dioxide, formaldehyde, a lower aliphatic aldehyde, an aromatic aldehyde, an aliphatic ketone, an aromatic ketone, a mixed aliphatic/aromatic ketone, glyoxal, pyruvaldehyde or glyoxylic acid as the modification agent in a liquid dispersion medium consisting of water or an organic solvent for a duration of about 15 minutes to about 24 hours. When the thus-modified catalyst is used in the hydrogenation of a nitrile to the corresponding amine, the selectivity is increased, and significantly favors the amount of the primary amine vis-à-vis the undesired secondary amine in the hydrogenation product as compared to when the corresponding unmodified catalyst is employed.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: February 18, 2003
    Assignee: Roche Vitamins, Inc.
    Inventors: Oliver Gerald Degischer, Felix Roessler
  • Modification of a hydrogenation catalyst
    Publication number: 20010004672
    Abstract: A process for the modification of a hydrogenation catalyst of the Raney nickel, Raney cobalt, nickel-on-carrier or cobalt-on-carrier type, which process includes treating the hydrogenation catalyst at temperatures of about 0° C. to about 120° C. with carbon monoxide, carbon dioxide, formaldehyde, a lower aliphatic aldehyde, an aromatic aldehyde, an aliphatic ketone, an aromatic ketone, a mixed aliphatic/aromatic ketone, glyoxal, pyruvaldehyde or glyoxylic acid as the modification agent in a liquid dispersion medium consisting of water or an organic solvent for a duration of about 15 minutes to about 24 hours. When the thus-modified catalyst is used in the hydrogenation of a nitrile to the corresponding amine, the selectivity is increased, and significantly favors the amount of the primary amine vis-à-vis the undesired secondary amine in the hydrogenation product as compared to when the corresponding unmodified catalyst is employed.
    Type: Application
    Filed: November 30, 2000
    Publication date: June 21, 2001
    Inventors: Oliver Gerald Degischer, Felix Roessler
  • Hydrogenation process
    Patent number: 5132464
    Abstract: There is disclosed a catalytic hydrogenation process resulting in compounds of the formula ##STR1## wherein the dotted line represents a facultative bond, by hydrogenating the compound of the formula ##STR2## in the presence of a platinum or a nickel catalyst.
    Type: Grant
    Filed: January 23, 1990
    Date of Patent: July 21, 1992
    Assignee: Hoffmann-La Roche, Inc.
    Inventors: Bryant E. Rossiter, Francois Montavon, Felix Roessler