Patents by Inventor Ingmar Held

Ingmar Held 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).

  • 3,4-diaminopyridine derivatives for use as catalysts
    Patent number: 7994169
    Abstract: The present invention relates to 3,4-diaminopyridine derivatives of formula (I) wherein R1 and R2 are, independently of each other, electron donors, wherein R2 is optionally H; and R3, R4, R5, and R6 are, independently of each other, H, optionally substituted straight-chain or branched alkyl, alkenyl, alkynyl, alkoxyl, or aryl, wherein R3 and/or R4 together with R5 and/or R6, optionally define a ring; processes for their preparation, and their use as catalysts.
    Type: Grant
    Filed: December 6, 2007
    Date of Patent: August 9, 2011
    Assignee: Bayer MaterialScience AG
    Inventors: Hendrik Zipse, Ingmar Held
  • 3,4-diaminopyridine derivatives
    Publication number: 20080176747
    Abstract: 3,4-Diaminopyridine derivatives corresponding to a specified formula are produced by (a) reacting 3,4-diaminopyridine with a 1,2-dicarbonyl compound to form a diimine; (b) reducing the diimine to a diamine; and (c) replacing at least a hydrogen atom on nitrogen at position 4 of the pyridine ring. These compounds are useful as catalysts.
    Type: Application
    Filed: December 6, 2007
    Publication date: July 24, 2008
    Inventors: Hendrik Zipse, Ingmar Held