Patents by Inventor Albert S. C. Chan

Albert S. C. Chan 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 .alpha.-arylpropionic acids
    Patent number: 5233084
    Abstract: Process for preparing .alpha.-arylpropionic acids by catalytically asymmetrically hydrogenating .alpha.-arylpropenoic acids prepared from .alpha.-aryl ketones.
    Type: Grant
    Filed: December 3, 1990
    Date of Patent: August 3, 1993
    Assignee: Monsanto Company
    Inventor: Albert S. C. Chan
  • Asymmetric catalytic hydrogenation of .alpha.-arylpropenoic acids
    Patent number: 5202474
    Abstract: Process for preparing .alpha.-arylpropionic acids by catalytically asymmetrically hydrogenating .alpha.-arylpropenoic acids utilizing an asymmetric hydrogenation catalyst at low temperatures and, optionally, at high pressures.
    Type: Grant
    Filed: March 2, 1990
    Date of Patent: April 13, 1993
    Assignee: Monsanto Company
    Inventor: Albert S. C. Chan
  • Ruthenium-binap asymmetric hydrogenation catalyst
    Patent number: 5202473
    Abstract: A ruthenium-phosphine complex represented by the formula:[RuXY(BINAP].sub.nwherein n is an integer of from 1 to about 10; and X and Y independently represent nonchelating anionic ligands.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: April 13, 1993
    Assignee: Monsanto Company
    Inventors: Albert S. C. Chan, Scott A. Laneman
  • Ruthenium-BINAP asymmetric hydrogenation catalyst
    Patent number: 5198561
    Abstract: A ruthenium-phosphine complex represented by the formula:[RuXY(BINAP)].sub.nwherein n is an integer of from 1 to about 10; and X and Y independently represent nonchelating anionic ligands.
    Type: Grant
    Filed: March 6, 1991
    Date of Patent: March 30, 1993
    Assignee: Monsanto Company
    Inventors: Albert S. C. Chan, Scott A. Laneman
  • Ruthenium(II)-BINAP diketonate complexes
    Patent number: 5144050
    Abstract: Ru(BINAP) diketonate complexes manifest asymmetric hydrogenation catalytic activity with high reaction and conversion rates.
    Type: Grant
    Filed: October 1, 1991
    Date of Patent: September 1, 1992
    Assignee: Monsanto Company
    Inventors: Albert S. C. Chan, Scott A. Laneman
  • Asymmetric catalytic hydrogenation of .alpha.-arylpropenic acids
    Patent number: 4994607
    Abstract: Process for preparing .alpha.-arylpropionic acids by catalytically asymmetrically hydrogenating .alpha.-arylpropenoic acids utilizing an asymmetric hydrogenation catalyst at low temperatures and, optionally, at high pressures.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: February 19, 1991
    Assignee: Monsanto Company
    Inventor: Albert S. C. Chan
  • Asymmetric hydrogenolysis of epoxides
    Patent number: 4870208
    Abstract: A process of preparing chiral alcohols by the asymmetric catalytic hydrogenolysis of epoxides using rhodium or ruthenium catalysts containing chiral phosphine ligands.
    Type: Grant
    Filed: June 3, 1988
    Date of Patent: September 26, 1989
    Assignee: Monsanto Company
    Inventors: Albert S. C. Chan, James P. Coleman, Grace M. Wagner
  • Pyrophosphate coating process for calcium carbonate dental abrasives
    Patent number: 4678662
    Abstract: Calcium carbonate particles are coated with a pyrophosphate derivative. The invention includes the coated particles, method of preparation and use in oral hygiene products.
    Type: Grant
    Filed: October 9, 1985
    Date of Patent: July 7, 1987
    Assignee: Monsanto Company
    Inventor: Albert S. C. Chan
  • Production of adipic acid from 1,4-disubstituted-2-butene
    Patent number: 4633015
    Abstract: The dicarbonylation product of 1,4-disubstituted-2-butene is useful as intermediate in the production of adipic acid, hexamethylenediamine and 1,6-hexanediol. It is produced by carbonylating a solution of the disubstituted butene in a polar, aprotic non-basic solvent at 80.degree.-140.degree. C. in the presence of a catalyst comprised of a halide of the transition metal. The dicarbonylation product is converted to adipic acid by hydrogenation followed by hydrolysis.
    Type: Grant
    Filed: November 9, 1984
    Date of Patent: December 30, 1986
    Assignee: Monsanto Company
    Inventors: Albert S. C. Chan, Donald E. Morris
  • Production of hex-3-enedioate esters from 1,4 dialkoxy butenes
    Patent number: 4611082
    Abstract: The dicarbonylation product of 1,4-dialkoxy substituted-2-butene is useful as intermediate in the production of adipic acid, hexamethylenediamine and 1,6-hexanediol. It is produced by carbonylating a solution of the dialkoxy substituted butene in a polar, aprotic non-basic solvent at 80.degree.-140.degree. C. in the presence of a catalyst comprising a halide of the transition metal.
    Type: Grant
    Filed: November 9, 1984
    Date of Patent: September 9, 1986
    Assignee: Monsanto Company
    Inventors: Albert S. C. Chan, Donald E. Morris