Patents by Inventor Gerhard Demmer

Gerhard Demmer 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 preparing 4-(4?-carboxyphenyl)pyridine
    Patent number: 6392051
    Abstract: The invention relates to a process for preparing 4-(4′-carboxyphenyl)pyridine, which comprises oxidizing a 4-phenyl-N-acyldihydropyridine of the formula (II) where R1 is a bulky alkyl, alkylaryl, arylalkyl or alkoxy group and R2 is a straight-chain or branched, substituted or unsubstituted alkyl radical having from 1 to 8 carbon atoms, by means of an oxidizing agent selected from the group consisting of permanganates, nitric acid, Cr(VI) compounds, oxygen and air to give the compound of the formula (I) where M is a cation.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: May 21, 2002
    Assignee: Clariant GmbH
    Inventors: Andreas Meudt, Stefan Scherer, Peter Koch, Gerhard Demmer, Frank Vollmüller
  • Process for preparing 4-(4'-carboxyphenyl)pyridine
    Publication number: 20010021778
    Abstract: The invention relates to a process for preparing 4-(4′-carboxyphenyl)pyridine, which comprises oxidizing a 4-phenyl-N-acyldihydropyridine of the formula (II) 1
    Type: Application
    Filed: February 15, 2001
    Publication date: September 13, 2001
    Applicant: Clariant GmbH
    Inventors: Andreas Meudt, Stefan Scherer, Peter Koch, Gerhard Demmer, Frank Vollmuller