Patents by Inventor Klaus Fitzinger

Klaus Fitzinger 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 arylhydantoins
    Patent number: 5436256
    Abstract: Process for the preparation of 5-arylhydantoins by reaction of an allantoin acid alkyl ester with an aryl compound in a concentrated inorganic acid at temperatures from room temperature to 150.degree. C., with or without a phase transfer agent.
    Type: Grant
    Filed: November 26, 1993
    Date of Patent: July 25, 1995
    Assignee: Chemie Linz Gesellschaft m.b.H.
    Inventors: Wolfram Hendel, Engelbert Kloimstein, Klaus Fitzinger, Antonia Viehbock, Kurt Haidinger
  • Process for the preparation of allantoin
    Patent number: 5196545
    Abstract: Process for the preparation of allantoin in a two-stage reaction by reaction of methyl glyoxylate methyl hemiacetal with urea in the presence of an inorganic acid at a pH-value of 1.0-2.0 and carrying out the ring-closure reaction at a pH-value of 7.0 to 9.0 in a second reaction stage.
    Type: Grant
    Filed: May 30, 1991
    Date of Patent: March 23, 1993
    Assignee: Chemie Linz Gesellschaft m.b.H.
    Inventors: Karl Schermanz, Klaus Fitzinger
  • Process for the preparation of substituted 3-amino-2 (benzoyl)-acrylic acid esters, and a process for the preparation of intermediates for antibacterial active compounds from these compounds
    Patent number: 5011971
    Abstract: Process for the preparation of substituted 3-amino-2-(benzoyl)-acrylic acid esters of the formula I ##STR1## in which R.sub.1 denotes an alkyl radical with 1 to 4 C atoms, X.sub.1 denotes halogen, in particular fluorine or chlorine, X.sub.2, X.sub.3, X.sub.4 and X.sub.5 denote hydrogen, halogen, in particular fluorine or chlorine, an alkyl radical having 1-4 C atoms or an alkoxy radical having 1-4 C atoms in the alkyl chain, by selectively reducing a substituted 2-cyano-3-hydroxy-3(phenyl)acrylic acid ester of the formula II ##STR2## in which R.sub.1, X.sub.1, X.sub.2, X.sub.3, X.sub.4 and X.sub.5 have the meaning given above, and a process for the preparation of intermediate products for antibacterially active compounds from these compounds.
    Type: Grant
    Filed: June 8, 1989
    Date of Patent: April 30, 1991
    Assignee: Chemie Linz Gesellschaft m.b.H.
    Inventors: Karl Baumann, Klaus Fitzinger