Patents by Inventor Rüdiger Schubart

Rüdiger Schubart 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 zinc dithiocarbamates
    Patent number: 6534675
    Abstract: Zinc dithiocarbamates are obtained in especially readily filterable form and high purity when zinc salts are first added, in aqueous solution, to the secondary amines underlying the zinc carbamates, so that a zinc salt complex of the amines is formed, and carbon disulfide and then sodium hydroxide solution are then introduced, with stirring, into the aqueous suspension so obtained, the temperatures being maintained in the range from room temperature to the boiling temperature of carbon disulfide until the reaction has completely finished.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: March 18, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rüdiger Schubart, Hans-Wilhelm Engels
  • Process for preparing biodegradable polymers having repeating succinyl units
    Patent number: 6395870
    Abstract: A process for preparing biodegradable polymers having repeating succinyl units, characterized in that an optionally substituted 1,4-butanedicarboxylic acid, or a 1,4-butanedicarboxylic acid derivative is reacted with an acid anhydride.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: May 28, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventor: Ruediger Schubart
  • Process for preparing Cis-2,6-dimethylpiperazine
    Patent number: 6365741
    Abstract: This invention relates to a process for the selective preparation of cis-2,6-dimethylpiperazine by reacting (i) a diisopropanolamine mixture comprising compounds having the formulas HN(CH2CH(OH)CH3)2, HN(CH(CH3)CH2OH)2, and HN(CH(CH3)CH2OH)(CH2CH(OH)CH3) or (ii) 1,2-diaminopropane with ammonia and hydrogen in the presence of a hydrogenation catalyst.
    Type: Grant
    Filed: August 8, 2001
    Date of Patent: April 2, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventor: Rüdiger Schubart
  • Process for preparing cis-2,6-dimethylpiperazine
    Patent number: 6316622
    Abstract: This invention relates to a process for the selective preparation of cis-2,6-dimethylpiperazine by reacting (i) a diisopropanolamine mixture comprising compounds having the formulas HN(CH2CH(OH)CH3)2, HN(CH(CH3)CH2OH)2, and HN(CH(CH3)CH2OH)(CH2CH(OH)CH3) or (ii) 1,2-diaminopropane with ammonia and hydrogen in the presence of a hydrogenation catalyst.
    Type: Grant
    Filed: February 15, 2000
    Date of Patent: November 13, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventor: Rüdiger Schubart