Patents by Inventor Ulrich Schwartz

Ulrich Schwartz 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 (meth)acrylamides, a process for their preparation, and their use for racemate resolution
    Patent number: 4937000
    Abstract: The invention relates to optically active homo- and copolymers made from optically active (meth)acrylamides, the polymers being immobilized on silica gel, a process for their preparation, and their use as adsorbents, in particular as the stationary phase for chromatographic racemate resolution.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: June 26, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bruno Bomer, Rolf Grosser, Ulrich Schwartz, Dieter Arlt, Karl-Erwin Piejko
  • Optical active (meth)acrylamides and polymers thereof for racemate resolution
    Patent number: 4931525
    Abstract: In the chromatographic separation of a mixture of antipodes of optically active chemicals by passing a solution of such mixture over an optically active adsorbent to effect adsorption, and then eluting the adsorbed material, the improvement which comprises employing as the adsorbent particles of an optically active and cross-linked polymer containing the repeating structural unit ##STR1## in which R.sup.1 represents hydrogen or methyl, andR.sup.2 represents one of the stereoisomers of the eight possible stereoisomeric forms of each of the optically active radicals of the formulae ##STR2## Improved separation results. The pure monomers are also new.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: June 5, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ulrich Schwartz, Rolf Grosser, Karl-Erwin Piejko, Bruno Bomer, Dieter Arlt
  • Optically active (meth)acrylamides, a process for their preparation, and their use for racemate resolution
    Patent number: 4914159
    Abstract: The invention relates to optically active homo- and copolymers made from optically active (meth)acrylamides, the polymers being immobilized on silica gel, a process for their preparation, and their use as adsorbents, in particular as the stationary phase for chromatographic racemate resolution.
    Type: Grant
    Filed: March 1, 1988
    Date of Patent: April 3, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bruno Bomer, Rolf Grosser, Ulrich Schwartz, Dieter Arlt, Karl-Erwin Piejko
  • Separation of diastereomers by extractive distillation
    Patent number: 4874473
    Abstract: Diastereomers can be separated with good industrial success with the aid of extractive distillation. The separation process is characterized in that an auxiliary which changes the partial pressure of the various diastereomers to be separated to a different degree and thus allows easier separation of the diastereomers by distillation is added during the distillation. Using the present process diastereomic cis/trans-permetric acid methyl esters and mixtures of menthol and isomenthol can be separated with isolation of 99% pure product.
    Type: Grant
    Filed: April 16, 1987
    Date of Patent: October 17, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dieter Arlt, Ulrich Schwartz, Hans-Walter Brandt, Wolfgang Arlt, Andreas Nickel
  • Process for synthesizing estrone or estrone derivatives
    Patent number: 4357278
    Abstract: What are disclosed are a multi-step synthesis for the preparation of 9(11)-dehydroestrone 3-methyl ether from 2-methyl,4-methoxy benzaldehyde; 1-(4-methoxy-2-methyl-(phenyl)-3-(1-methyl-2-oxo-5-t-vinyl-cyclopent-r-yl) -propane-1-one, an intermediate in said synthesis; and a method for the preparation of 3-vinylcyclopentanone from 2-vinylcyclopropane-1,1-dicarboxylic acid.
    Type: Grant
    Filed: April 10, 1981
    Date of Patent: November 2, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Quinkert, Wolf-Dietrich Weber, Ulrich Schwartz