Patents by Inventor Antonia Praus

Antonia Praus 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 preparing glyoxylic esters and their hydrates
    Patent number: 5939580
    Abstract: Process for preparing glyoxylic esters or their hydrates in which a water-soluble salt of a maleic or fumaric monoester or a mixture thereof is reacted with ozone in aqueous solution at temperatures of from 0 to 50.degree. C., and the corresponding glyoxylic ester or its hydrate is isolated from the resulting reaction mixture.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: August 17, 1999
    Assignee: DSM Fine Chemicals Austria GmbH
    Inventors: Engelbert Kloimstein, Wolfram Hendel, Klaus Reiter, Christian Burger, Antonia Praus, Karl Heinz Giselbrecht, Eduard Perndorfer
  • Process for the preparation of carboxylic acid succinimidyl esters
    Patent number: 5929251
    Abstract: Process for the preparation of carboxylic acid succinimidyl esters by reaction of N-hydroxysuccinimide with a carboxylic acid and a halophosphoric acid ester of the formula ##STR1## in which R.sub.1 and R.sub.2 are identical or different and are a C.sub.2 - to C.sub.6 -alkyl radical or a phenyl radical, or R.sub.1 and R.sub.2 together form a C.sub.6 -aryl radical, in the presence of a base in a diluent at a temperature of 0.degree. C. up to 100.degree. C. and isolation of the corresponding carboxylic acid succinimidyl ester.
    Type: Grant
    Filed: December 30, 1997
    Date of Patent: July 27, 1999
    Assignee: DSM Fine Chemicals Austria GmbH
    Inventors: Peter Pochlauer, Wolfram Hendel, Christian Burger, Anita Lamplmayr, Harald Poschko, Antonia Praus, Gerald Summer
  • Process for the preparation of carboxylic acid succinimidyl esters
    Patent number: 5734064
    Abstract: A process for the preparation of carboxylic acid succinimidyl esters by reaction of N-hydroxysuccinimide with a carboxylic acid and a halophosphoric acid ester of the formula ##STR1## is desired, in which R.sub.1 and R.sub.2 are identical or different and are a C.sub.2 - to C.sub.6 -alkyl radical or a phenyl radical, or R.sub.1 and R.sub.2 The process is carried out in the presence of a base in a diluent at a temperature of 0.degree. C. up to 100.degree. C. with isolation of the corresponding carboxylic acid succinimidyl ester.
    Type: Grant
    Filed: April 4, 1997
    Date of Patent: March 31, 1998
    Assignee: DSM Chemie Linz GmbH
    Inventors: Peter Pochlauer, Wolfram Hendel, Christian Burger, Anita Lamplmayr, Harald Poschko, Antonia Praus, Gerald Summer