Patents by Inventor Roland Gestigkeit

Roland Gestigkeit 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: 5807969
    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 with the following structure:M--CO--R*--CO--Mwhere M stands for the residue of an (optionally substituted) 2-hydroxybenzoxazole, 2-hydroxybenzothiazole, or 1-hydroxybenzotriazole or of corresponding mercapto compounds and R* is the parent body of the dicarboxylic acid.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: September 15, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventors: Recai Sezi, Hellmut Ahne, Eberhard Kuehn, Roland Gestigkeit
  • 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
  • Method for the production of poly-o-hydroxyamides
    Patent number: 5750638
    Abstract: A method for producing poly-o-hydroxy amides by heating a dicarboxylic acid to a temperature .gtoreq.80.degree. C., together with a sulfonic acid chloride and a tertiary amine in a suitable solvent, to form a reaction mixture and reacting the mixture obtained with a bis-o-aminophenol solution at a temperature <80.degree. C.
    Type: Grant
    Filed: June 19, 1996
    Date of Patent: May 12, 1998
    Assignee: Siemens Aktiengesesllschaft
    Inventors: Recai Sezi, Hellmut Ahne, Roland Gestigkeit
  • Preparation of poly-o-hydroxyamides and poly-o-mercaptoamides
    Patent number: 5696218
    Abstract: In a process for the preparation of poly-o-hydroxyamides and poly-o-mercaptoamides, a bis-o-hydroxyamide or a bis-o-mercaptoamide is reacted with a dihydroxy compound in the presence of a basic catalyst.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: December 9, 1997
    Assignee: Siemens Aktiengesellschaft
    Inventors: Recai Sezi, Hellmut Ahne, Roland Gestigkeit