Patents by Inventor Josef Schaller

Josef Schaller 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 purification of ketones obtained from the corresponding terpenes by ozonolysis and reduction
    Patent number: 6545186
    Abstract: Improved, safe process for the purification of ketones obtained by ozonolysis and subsequent reduction of the corresponding terpenes, in which, after the ozonolysis and reduction of acyclic mono-, bi- or tricyclic terpenes with ozonizable double bonds, converting the resulting corresponding crude ketone into a high-purity ketone by means of steam distillation at atmospheric pressure or at reduced pressure, extraction of the steam distillate and subsequent distillation.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: April 8, 2003
    Assignee: DSM Fine Chemicals Austria Nfg GmbH & Co., KG
    Inventors: Karlheinz Giselbrecht, Josef Schaller, Rudolf Hermanseder, Klaus Reiter
  • Process for the purification of ketones obtained from the corresponding terpenes by ozonolysis and reduction
    Publication number: 20020077510
    Abstract: Improved, safe process for the purification of ketones obtained by ozonolysis and subsequent reduction of the corresponding terpenes, in which, after the ozonolysis and reduction of acyclic mono-, bi- or tricyclic terpenes with ozonizable double bonds, converting the resulting corresponding crude ketone into a high-purity ketone by means of steam distillation at atmospheric pressure or at reduced pressure, extraction of the steam distillate and subsequent distillation.
    Type: Application
    Filed: December 12, 2001
    Publication date: June 20, 2002
    Inventors: Karlheinz Giselbrecht, Josef Schaller, Rudolf Hermanseder, Klaus Reiter
  • Process for preparing L-aspartic acid
    Patent number: 6258572
    Abstract: An improved process for preparing L-aspartic acid by enzyme-catalyzed reaction of fumaric acid with ammonia, in which process L-aspartic acid is precipitated out by nitric acid and the resultant mother liquor is subjected to a nanofiltration.
    Type: Grant
    Filed: May 20, 1999
    Date of Patent: July 10, 2001
    Assignee: DSM Fine Chemicals Austria Nfg GmbH & CoKG
    Inventors: Karl-Heinz Giselbrecht, Josef Schaller
  • Process for preparing L-aspartic acid
    Patent number: 5952206
    Abstract: An improved process for preparing L-aspartic acid by enzyme-catalyzed reaction of fumaric acid with ammonia, in which, after reaction has been completed, excess ammonia is removed from the reaction mixture, L-aspartic acid is precipitated by adding acetic acid or formic acid, whereupon formic acid and acetic acid are rereleased from the mother liquor by adding fumaric acid, and the ammonia released and the liberated formic or acetic acid and the ammonium fumarate formed in the liberation are reused for subsequent cycles.
    Type: Grant
    Filed: December 29, 1998
    Date of Patent: September 14, 1999
    Assignee: DSM Fine Chemicals Austria GmbH
    Inventors: Karl-Heinz Giselbrecht, Josef Schaller
  • Process for the preparation of pure (S,S)-N-(1-ethoxycarbonyl-3-phenylpropyl) alanine
    Patent number: 5756812
    Abstract: Process for the preparation of pure (S,S)-N-(1-ethoxycarbonyl-3-phenylpropyl) alanine,in which impure (S,S)-N-(1-ethoxycarbonyl-3-phenylpropyl)alanine is suspended in water, dissolved by heating to the boiling point and separated from insoluble impurities by filtration and the desired end product is then precipitated by cooling, filtered off and dried.
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: May 26, 1998
    Assignee: DSM Chemie Linz GmbH
    Inventors: Kurt Alfred Hackl, Josef Schaller
  • Process for the preparation of alpha, omega-alkanedioic acids
    Patent number: 5202478
    Abstract: Process for the preparation of alpha, omega-alkanedicarboxylic acids of the general formula I ##STR1## in which A is an alkylene radical having 4-14 C atoms by reacting a cycloalkene of the general formula II ##STR2## in which A has the abovementioned meaning with ozone in the presence of an inert solvent, catalytically hydrogenating the peroxide solution formed, followed by oxidation of the dialdehyde formed to the diacid of the formula I in the presence of an inert aprotic solvent.
    Type: Grant
    Filed: December 12, 1990
    Date of Patent: April 13, 1993
    Assignee: Chemie Linz Gesellschaft m.b.H.
    Inventors: Karl Schermanz, Manfred Schoftner, Engelbert Kloimstein, Josef Schaller, Eduard Perndorfer, Klaus Reiter, Rudolf Neuhofer