Patents by Inventor Yuen-Lung L. Sing

Yuen-Lung L. Sing 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).

  • Processes for preparation of 9, 11-epoxy steroids and intermediates useful therein
    Patent number: 6331622
    Abstract: A process for the formation of an epoxy compound comprising contacting a substrate compound having an olefinic double bond with a peroxide compound in the presence of a peroxide activator, said peroxide activator corresponding to the formula: where Ro is a substituent having an electron withdrawing strength not less than that of monochloromethyl.
    Type: Grant
    Filed: February 8, 1999
    Date of Patent: December 18, 2001
    Assignee: G.D. Searle & Co.
    Inventors: John S. Ng, Ping T. Wang, Julio A. Baez, Chin Liu, Dennis K. Anderson, Jon P. Lawson, Bernhard Erb, Joseph Wieczorek, Gennaro Mucciariello, Fortunato Vanzanella, Sastry A. Kunda, Leo J. Letendre, Mark J. Pozzo, Yuen-Lung L. Sing, Edward E. Yonan
  • Keto-Substituted Steroid Compounds
    Patent number: 6258946
    Abstract: Multiple novel reaction schemes, novel process steps and novel intermediates are provided for the synthesis of epoxymexrenone, useful as a diuretic, and other compounds of Formula I wherein the variables are as defined by the specification.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: July 10, 2001
    Assignee: G. D. Searle & Co.
    Inventors: John S. Ng, Ping T. Wang, Julio A. Baez, Chin Liu, Dennis K. Anderson, Jon P. Lawson, Bernhard Erb, Joseph Wieczorek, Gennaro Mucciariello, Fortunato Vanzanella, Sastry A. Kunda, Leo J. Letendre, Mark J. Pozzo, Yuen-Lung L. Sing, Edward E. Yonan
  • Processes for preparation of 9,11-epoxy steroids and intermediates useful therein
    Patent number: 6180780
    Abstract: Multiple reaction schemes, process steps and intermediates are provided for the synthesis of epoxymexrenone, useful as a diuretic, and other compounds of Formula I wherein the variables are as defined by the specification.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: January 30, 2001
    Assignee: G.D. Searle & Co.
    Inventors: John S. Ng, Ping T. Wang, Julio A. Baez, Chin Liu, Dennis K. Anderson, Jon P. Lawson, Bernhard Erb, Joseph Wieczorek, Gennaro Mucciariello, Fortunato Vanzanella, Sastry A. Kunda, Leo J. Letendre, Mark J. Pozzo, Yuen-Lung L. Sing, Edward E. Yonan
  • Processes for preparation of 9,11-epoxy steroids and intermediates useful therein
    Patent number: 5981744
    Abstract: Multiple reaction schemes, process steps and intermediates are provided for the synthesis of epoxymexrenone, useful as a diuretic, and other 9,11-epoxy-steroids.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: November 9, 1999
    Assignee: G. D. Searle and Co.
    Inventors: John S. Ng, Ping T. Wang, Julio A. Baez, Chin Liu, Dennis K. Anderson, Jon P. Lawson, Bernhard Erb, Joseph Wieczorek, Sastry A. Kunda, Leo J. Letendre, Mark J. Pozzo, Yuen-Lung L. Sing, Edward E. Yonan
  • Substituted 2,6-substituted pyridine compounds
    Patent number: 5424274
    Abstract: Disclosed herein are herbicidal pyridine compounds substituted at the 3- and/or 5-position with a carboxylic acid-derived heterocyclic moiety, as well as herbicidal compositions and use of these compounds.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: June 13, 1995
    Assignee: Rohm and Haas Company
    Inventors: Yuen-Lung L. Sing, Len F. Lee
  • Substituted pyridine compounds useful as herbicidal agents
    Patent number: 5380699
    Abstract: The present invention provides novel herbicidal pyridines characterized by having in the 3- or 5-position an aliphatic or aromatic 1-ketone.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: January 10, 1995
    Assignee: Rohm and Haas Company
    Inventors: Len F. Lee, Yuen-Lung L. Sing, Sai C. Wong
  • Substituted pyridine compounds which have herbicidal utility
    Patent number: 5298479
    Abstract: The present invention provides novel herbicidal pyridines characterized by having in the 3- or 5-position an aliphatic or aromatic 1-ketone.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: March 29, 1994
    Assignee: Monsanto Company
    Inventors: Len F. Lee, Yuen-Lung L. Sing, Sai C. Wong
  • Substituted pyridine compounds having herbicidal activity
    Patent number: 5260262
    Abstract: The present invention provides novel herbicidal pyridines characterized by having in the 3- or 5-position an aliphatic or aromatic 1-ketone.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: November 9, 1993
    Assignee: Monsanto Company
    Inventors: Len F. Lee, Yuen-Lung L. Sing, Sai C. Wong
  • Substituted 2,6-substituted pyridine compounds useful as herbicides
    Patent number: 5219824
    Abstract: Disclosed herein are herbicidal pyridine compounds substituted at the 3- and/or 5-position with a carboxylic acid-derived heterocyclic moiety, as well as herbicidal compositions and use of these compounds.
    Type: Grant
    Filed: October 21, 1991
    Date of Patent: June 15, 1993
    Assignee: Monsanto Company
    Inventors: Yuen-Lung L. Sing, Len F. Lee
  • Substituted 2,6-substituted pyridine compounds having herbicidal activity
    Patent number: 5100461
    Abstract: Disclosed herein are herbicidal pyridine compounds substituted at the 3- and/or 5-position with a carboxylic acid-derived heterocyclic moiety, as well as herbicidal compositions and use of these compounds.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: March 31, 1992
    Assignee: Monsanto Company
    Inventors: Yuen-Lung L. Sing, Len F. Lee
  • Penta-substituted pyridine compounds, herbicidal compositions and herbicidal method of use
    Patent number: 4988384
    Abstract: Disclosed herein are herbicidal pyridine compounds substituted at the 3- and/or 5-position with a carboxylic acid-derived heterocyclic moiety, as well as herbicidal compositions and use of these compounds.
    Type: Grant
    Filed: December 24, 1987
    Date of Patent: January 29, 1991
    Assignee: Monsanto Company
    Inventors: Yuen-Lung L. Sing, Len F. Lee
  • Substituted 2,6-substituted pyridine compounds
    Patent number: 4826532
    Abstract: Compounds of the formula ##STR1## are disclosed as herbicides. Disclosed herein are cyclic amides of pyridine 3,5-carboxylic acids substituted at the 2- and/or 6-position with a fluorinated methyl group. Also disclosed are herbicidal use of such compounds and compositions containing them.
    Type: Grant
    Filed: December 24, 1987
    Date of Patent: May 2, 1989
    Assignee: Monsanto Company
    Inventors: Yuen-Lung L. Sing, Maria L. Miller, Len F. Lee