Patents by Inventor Kurt Geibel

Kurt Geibel 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).

  • Preparation of poly-o-hydroxyamides and poly o-mercaptoamides
    Patent number: 5973202
    Abstract: In a process for the preparation of poly-o-hydroxyamides and poly-o-mercaptoamides, a bis-o-aminophenol or a bis-o-aminothiophenol is reacted with a dicarboxylic acid derivative of the following structure: ##STR1## with D=O, S, or NH and where R* is the parent body of the dicarboxylic acid and at least one of the groups R.sup.1 and R.sup.2 is CN or NO.sub.2.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: October 26, 1999
    Assignee: Siemens Aktiengesellschaft
    Inventors: Recai Sezi, Hellmut Ahne, Eva Rissel, Kurt Geibel
  • Preparation of poly-o-hydroxyamides and poly-o-mercaptoamides
    Patent number: 5760162
    Abstract: In a process for the preparation of poly-o-hydroxyamides and poly-o-mercaptoamides, a bis-o-aminophenol or a bis-o-aminothiophenol is reacted at a temperature of .ltoreq.0.degree. C. with a mixed dianhydride of a dicarboxylic acid and a sulfonic acid with the following structure:E--SO.sub.2 --O--CO--R*--CO--O--SO.sub.2 --Ewhere E is an (optionally substituted) methyl, phenyl, or naphthyl group and R* is the parent body of the dicarboxylic acid.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: June 2, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventors: Recai Sezi, Hellmut Ahne, Roland Gestigkeit, Kurt Geibel