Patents by Inventor Rudolf Schwabe

Rudolf Schwabe 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).

  • Phenyl alkyl ketone substituted by cyclic amine and a process for the preparation thereof
    Patent number: 6191182
    Abstract: A novel process for the preparation of compounds of formula I by aminolysis of a p-halophenyl alkyl ketone of formula II with a cyclic amine of formula III in water at a temperature of at least 130° C., in which formulae X is a halogen atom and R1, R2 and R3 are as claimed in claim 1, as well as the novel compounds of formula I and their use for the preparation of photoinitiators for the photopolymerisation of ethylenically unsaturated compounds.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: February 20, 2001
    Assignee: Ciba Specialty Chemcials Corporation
    Inventors: Rinaldo Hüsler, Rudolf Schwabe, Reto Luisoli
  • Phenyl alkyl ketone substituted by cyclic amine and a process for the preparation thereof
    Patent number: 5977357
    Abstract: A novel process for the preparation of compounds of formula I ##STR1## by aminolysis of a p-halophenyl alkyl ketone of formula II ##STR2## with a cyclic amine of formula III ##STR3## in water at a temperature of at least 130.degree. C., in which formulae X is a halogen atom and R.sub.1, R.sub.2 and R.sub.3 are as claimed in claim 1, as well as the novel compounds of formula I and their use for the preparation of photoinitiators for the photopolymerisation of ethylenically unsaturated compounds.
    Type: Grant
    Filed: June 1, 1998
    Date of Patent: November 2, 1999
    Assignee: Ciba Specialty Chemical Corporation
    Inventors: Rinaldo Husler, Rudolf Schwabe, Reto Luisoli
  • Phenyl alkyl ketone substituted by cyclic amine and a process for the preparation thereof
    Patent number: 5795985
    Abstract: A novel process for the preparation of compounds of formula I ##STR1## by aminolysis of a p-halophenyl alkyl ketone of formula II ##STR2## with a cyclic amine of formula III ##STR3## in water at a temperature of at least 130.degree. C., in which formulae X is a halogen atom and R.sub.1, R.sub.2 and R.sub.3 are as claimed in claim 1, as well as the novel compounds of formula I and their use for the preparation of photoinitiators for the photopolymerisation of ethylenically unsaturated compounds.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: August 18, 1998
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Rinaldo Husler, Rudolf Schwabe, Reto Luisoli
  • Process for the preparation of substituted phenols
    Patent number: 5072055
    Abstract: The substituent X in the phenols of the formula: ##STR1## wherein R.sub.1 to R.sub.4 are hydrogen or unsubstituted or substituted alkyl, alkenyl or alkynyl, and X is secondary or tertiary alkyl of 3 to 9 carbon atoms, can be removed by heating said phenols in the presence of an alkali metal hydrogensulfate.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: December 10, 1991
    Assignee: Ciba-Geigy Corporation
    Inventors: Hugo Illy, Ronald Salathe, Rudolf Schwabe