Patents by Inventor Guido Giffels

Guido Giffels 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 Grignard reagents and novel Grignard reagents
    Patent number: 6296788
    Abstract: Grignard reagents which contain a protected aldehyde function are obtained in a particularly advantageous manner from a halogenated aldehyde by reaction with a secondary monoamine to give an open-chain aminal, and conversion of the latter into a Grignard reagent using metallic magnesium. The invention also relates to novel Grignard reagents of this type.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: October 2, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Guido Giffels, Guido Steffan
  • Process for the preparation of 2-methoxyethoxy-benzenes and novel 2-methoxyethoxy-benzyl cyanides
    Patent number: 6288262
    Abstract: 2-Methoxyethoxy-benzenes are obtained in an advantageous manner from the corresponding phenol compounds by reaction with 2-chloroethyl methyl ether if the process is carried out without the addition of a strong solvent at temperatures above 95° C. and under pressure. The present invention also relates to novel 2-methoxyethoxybenzyl cyanides.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: September 11, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Guido Giffels, Claus Dreisbach
  • Process for the preparation of 2-methoxyethoxy-benzenes and novel 2-methoxyethoxy-benzyl cyanides
    Publication number: 20010014697
    Abstract: 2-Methoxyethoxy-benzenes are obtained in an advantageous manner from the corresponding phenol compounds by reaction with 2-chloroethyl methyl ether if the process is carried out without the addition of a strong solvent at temperatures above 95° C. and under pressure. The present invention also relates to novel 2-methoxyethoxy-benzyl cyanides.
    Type: Application
    Filed: January 30, 2001
    Publication date: August 16, 2001
    Inventors: Guido Giffels, Claus Dreisbach
  • Process for the catalytic enantioselective reduction of ketones
    Patent number: 6180837
    Abstract: The invention involves a procedure for the catalytic enantioselective reduction of ketones to chiral alcohols. Heretofore, this reaction was carried out batch-wise. Because, in this procedure, one utilizes a catalyst increased in size with polymer, it is possible to carry out the reaction in a quasi-continuous manner in a membrane reactor. In contrast to the state of the art, one thus dramatically increases the operative life of the catalyst.
    Type: Grant
    Filed: July 13, 1999
    Date of Patent: January 30, 2001
    Assignees: Degussa-Huels AG, Forschungszentrum Julich GmbH
    Inventors: Guido Giffels, Marcel Felder, Udo Kragl, Christian Wandrey, Andreas Bommarius, Carsten Bolm, Nadine Derrien, Karlheinz Drauz