Patents by Inventor Barbara Jäger

Barbara Jäger 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).

  • METHOD FOR PREPARING GUANIDINO ACETIC ACID
    Publication number: 20240010611
    Abstract: A method for preparing guanidino acetic acid involves reacting cyanamide and glycine in an aqueous reaction mixture in the presence of a base. The ammonia content in the reaction mixture is controlled to be below 20 g/L, and the dicyandiatrade content in the reaction mixture is kept below 5 wt.-%.
    Type: Application
    Filed: August 19, 2021
    Publication date: January 11, 2024
    Applicant: Evonik Operations GmbH
    Inventors: Timo Stahl, Axel Ronneburg, Barbara Jäger, Philipp Roth
  • Process for preparing ?-keto acids and derivatives thereof
    Patent number: 8299293
    Abstract: A method for preparing ?-keto acids, especially ?-ketomethionine, and/or derivatives thereof, whereby an aldehyde is reacted with thiols to give a corresponding dithioacetal, the dithioacetal formed, is reacted with an electrophile in the presence of a strong base, and the resulting ?,?-(dithio)carboxylic acid is solvolyzed with acid-catalysis to release thiol and give the ?-keto acid or a derivative thereof. Umpolung of aliphatic or aromatic aldehydes is effected by reaction with thiols.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: October 30, 2012
    Assignee: Evonik Degussa GmbH
    Inventors: Christoph Kobler, Martin Hateley, Philipp Roth, Barbara Jaeger, Christoph Weckbecker, Klaus Huthmacher
  • Ketomethionine ketals and derivatives thereof
    Patent number: 7815950
    Abstract: Ketomethionine ketals and hemiketals and derivatives thereof are useful as feed additives, in particular for the nutrition of ruminants.
    Type: Grant
    Filed: November 20, 2007
    Date of Patent: October 19, 2010
    Assignee: Evonik Degussa GmbH
    Inventors: Christoph Kobler, Martin Hateley, Philipp Roth, Barbara Jaeger, Rainer Peter, Christoph Weckbecker, Klaus Huthmacher
  • PROCESS FOR PREPARING a-KETO ACIDS AND DERIVATIVES THEREOF
    Publication number: 20090076302
    Abstract: A method for preparing ?-keto acids, especially ?-ketomethionine, and/or derivatives thereof, whereby an aldehyde is reacted with thiols to give a corresponding dithioacetal, the dithioacetal formed, is reacted with an electrophile in the presence of a strong base, and the resulting ?,?-(dithio)carboxylic acid is solvolyzed with acid-catalysis to release thiol and give the ?-keto acid or a derivative thereof. Umpolung of aliphatic or aromatic aldehydes is effected by reaction with thiols.
    Type: Application
    Filed: July 9, 2008
    Publication date: March 19, 2009
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Christoph Kobler, Martin Hateley, Philipp Roth, Barbara Jaeger, Christoph Weckbecker, Klaus Huthmacher
  • KETOMETHIONINE KETALS AND DERIVATIVES THEREOF
    Publication number: 20080124426
    Abstract: Ketomethionine ketals and hemiketals and derivatives thereof are useful as feed additives, in particular for the nutrition of ruminants.
    Type: Application
    Filed: November 20, 2007
    Publication date: May 29, 2008
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Christoph Kobler, Martin Hateley, Philipp Roth, Barbara Jaeger, Rainer Peter, Christoph Weckbecker, Klaus Huthmacher
  • Process for the preparation of 2,3,5-trimethyl-p-benzoquinone
    Patent number: 6262311
    Abstract: Process for the preparation of 2,3,5-trimethyl-p-benzoquinone by oxidizing 2,3,5-trimethylphenol or 2,3,6-trimethylphenol with oxygen or an oxygen-containing gas mixture in the presence of a catalyst system which can be a copper halide and a transition metal halide; for example iron, chromium, manganese, cobalt, nickel, zinc or a rare earth halide, in a two-phase reaction medium, at elevated temperature.
    Type: Grant
    Filed: October 16, 2000
    Date of Patent: July 17, 2001
    Assignee: Degussa AG
    Inventors: Ralf Maassen, Steffen Krill, Barbara Jäger, Klaus Huthmacher