Patents by Inventor Karl E. Koenig

Karl E. Koenig 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 preparation of 2-hydroxy-4-(methylthio) butanoic acid or methionine by mercaptan addition
    Patent number: 5973200
    Abstract: A process for the free-radical addition of a mercaptan to a nonconjugated olefinic substrate having a terminal carbon-carbon double bond is disclosed. 2-Hydroxy-4-(ethylthio)butanoic acid (HMBA) or methionine can be prepared using this method. The nonconjugated olefinic substrate has the general formula: ##STR1## wherein R is selected from the group consisting of --COOH, --COOR.sup.2, --CONR.sup.3 R.sup.4, --CN and --CCl.sub.3, R.sup.1 is selected from the group consisting of --OH, --OCOR.sup.2, --NHCOR.sup.2 and --NH.sub.2, R.sup.2 is selected from the group consisting of alkyl, cycloalkyl and aryl and R.sup.3 and R.sup.4 are independently selected from the group consisting of --H and R.sup.2.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: October 26, 1999
    Assignee: Novus International, Inc.
    Inventor: Karl E. Koenig
  • Process for producing N-phosphonomethylglycine
    Patent number: 5072033
    Abstract: A process for the production of N-phosphonomethylglycine comprising contacting N-phosphonomethyliminodiacetic acid with a peroxide in the presence of a catalyst selected from the group consisting of the salts and salt complexes of cobalt and vanadium, and an effective amount of a quinone or hydroquinone.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: December 10, 1991
    Assignee: Monsanto Company
    Inventors: Donald L. Fields, Jr., Raymond C. Grabiak, Karl E. Koenig, Dennis P. Riley
  • Process for producing N-phosphonomethylgylcine
    Patent number: 5061820
    Abstract: A process for the production of N-phosphonomethylglycine comprising contacting N-phosphonomethyliminodiacetic acid with a peroxide in the presence of a catalyst selected from the group consisting of the salts and salt complexes of cobalt and vancadium, and an effective amount of dipyridyl compound.
    Type: Grant
    Filed: October 22, 1990
    Date of Patent: October 29, 1991
    Assignee: Monsanto Company
    Inventors: Donald L. Fields, Jr., Raymond C. Grabiak, Karl E. Koenig, Dennis P. Riley
  • Process for the preparation of iminodiacetonitrile and iminodiacetic acid
    Patent number: 4948909
    Abstract: An improved process is provided for producing iminodiacetonitrile by contacting ammonia, formaldehyde and hydrogen cyanide, or hexamethylenetetramine, formaldehyde and hydrogen cyanide in a reaction medium, the improvement which comprises the further steps of thereafter adjusting the pH of the reaction medium to a pH between about 5.5 and about pH 10 and heating the reaction medium to an elevated temperature for a sufficient time to convert by-products in the reaction medium to iminodiacetonitrile.
    Type: Grant
    Filed: August 14, 1989
    Date of Patent: August 14, 1990
    Assignee: Monsanto Company
    Inventors: Karl E. Koenig, Gary A. Lanser, Paul A. Morrison, Robert B. Weisenfeld
  • Ephedrine and pseudoephedrine precursors
    Patent number: 4277420
    Abstract: Preparation of novel prochiral olefinic compounds which can be asymmetrically hydrogenated to enantiomers, which are converted to ephedrine and pseudoephedrine by described procedures.
    Type: Grant
    Filed: September 24, 1979
    Date of Patent: July 7, 1981
    Assignee: Monsanto Company
    Inventor: Karl E. Koenig