Patents by Inventor Len F. Lee

Len F. Lee 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).

  • 2,6-substituted pyridine compounds
    Patent number: 4835279
    Abstract: Disclosed herein are 3,5-pyridinedicarboxylic acid derivatives having halogen substitution at the 4 position which are useful as herbicides and herbicide precursors.
    Type: Grant
    Filed: June 17, 1987
    Date of Patent: May 30, 1989
    Assignee: Monsanto Company
    Inventors: Len F. Lee, Maria L. Miller
  • 2,6-substituted pyridine compounds
    Patent number: 4826530
    Abstract: There are disclosed novel 2,6-substituted-3,5-pyridinedicarboxylic acids, esters, salts, amides, halides, and cyano compounds useful as herbicides, and as intermediates which provide herbicides.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: May 2, 1989
    Assignee: Monsanto Company
    Inventor: 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
  • Herbicidal compositions and method containing 3,5-dicarboxylic acid esters of 2,6-bis-(fluoro-alkyl) tetrahydropyrans
    Patent number: 4816062
    Abstract: The disclosure herein pertains to herbicidal methods and compositions containing 3,5-dicarboxylic acid esters of 2,6-bis-(fluoroalkyl) tetrahydropyrans and piperidines which may be substituted in the 4-position by certain alkyl, phenyalkyl, phenyl, alkoxyalkyl, alkylthioalkyl, cycloalkyl, and heterocyclic radicals wherein the hetero atom is oxygen and sulfur and to a process for the preparation thereof. These compounds are useful as pre-emergent herbicides.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: March 28, 1989
    Assignee: Monsanto Company
    Inventor: Len F. Lee
  • Process for making glyphosate from n-phosphonomethyl-2-oxazolidone
    Patent number: 4810426
    Abstract: Hydrolysis of N-phosphonomethyl-2-oxazolidone and separation of the carbon dioxide co-product prior to oxidation of the hydrolyzate to glyphosate results in a process of significantly increased efficiency over the previously described processes.
    Type: Grant
    Filed: January 28, 1986
    Date of Patent: March 7, 1989
    Assignee: Monsanto Company
    Inventors: Donald L. Fields, Jr., Len F. Lee, Thomas J. Richard
  • 2,6-substituted pyridine compounds
    Patent number: 4797149
    Abstract: Disclosed herein are 3,5-pyridinedicarboxylic acid derivatives having heteroatom substitution at the 4 position which are useful as herbicides and herbicide precursors.
    Type: Grant
    Filed: June 22, 1987
    Date of Patent: January 10, 1989
    Assignee: Monsanto Company
    Inventors: Len F. Lee, Maria L. Miller
  • 5-sulfur substituted pyridine monocarboxylic herbicides
    Patent number: 4789395
    Abstract: Disclosed herein are compounds of the general formula ##STR1## which are useful as herbicides.
    Type: Grant
    Filed: May 12, 1986
    Date of Patent: December 6, 1988
    Assignee: Monsanto Company
    Inventors: Len F. Lee, Kerry L. Spear, Mark G. Dolson
  • Methyl 4,4,4-trifluoro-3-oxo-butanethioate
    Patent number: 4785129
    Abstract: Disclosed herein is 4,4,4-trifluoro-3-oxo-butanethioate, a useful starting material in the preparation of pyridinedicarboxylate herbicides.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: November 15, 1988
    Assignee: Monsanto Company
    Inventors: William F. Goure, Len F. Lee
  • Substituted 4,6-alkoxy pyridinecarboxylate compounds and herbicidal use
    Patent number: 4741766
    Abstract: Disclosed herein are 4,6-dialkoxy 3-pyridinecarboxylic acids and their derivatives which are useful as herbicides and herbicide intermediates.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: May 3, 1988
    Assignee: Monsanto Company
    Inventor: Len F. Lee
  • Herbicidal (2 or 6)-fluoroalkyl-4-amino pyridine derivatives
    Patent number: 4698093
    Abstract: Disclosed herein are 3,5-pyridinedicarboxylic acid derivatives having heteroatom substitution at the 4 position which are useful as herbicides and herbicide precursors.
    Type: Grant
    Filed: August 27, 1985
    Date of Patent: October 6, 1987
    Assignee: Monsanto Company
    Inventors: Len F. Lee, Maria L. Miller
  • 2,6-substituted pyridine compounds
    Patent number: 4692184
    Abstract: There are disclosed novel 2,6-substituted-3,5-pyridinedicarboxylic acids, esters, salts, amides, halides, and cyano compounds useful as herbicides, and as intermediates which provide herbicides.
    Type: Grant
    Filed: April 24, 1984
    Date of Patent: September 8, 1987
    Assignee: Monsanto Company
    Inventor: Len F. Lee
  • Herbicidal 2-trifluoromethyl 3-pyridine carboxylic acid derivatives
    Patent number: 4655816
    Abstract: There are disclosed novel 2,6-substituted-3-pyridinecarboxylic acids, esters, and salts useful as herbicides, and as intermediates which provide herbicides.
    Type: Grant
    Filed: August 27, 1985
    Date of Patent: April 7, 1987
    Assignee: Monsanto Company
    Inventors: Len F. Lee, Maria L. Miller
  • 3,5-dicarboxylic acid esters of 2,6-bis(fluoro-alkyl)-2,6-bis(hydroxy) piperidines
    Patent number: 4618679
    Abstract: Compounds of the formula ##STR1## wherein x is NH and wherein R.sub.1 is selected from branched-chain lower alkyl, alkoxyalkyl, alkylthioalkyl, cycloalkyl, and cycloalkanylalkyl radicals, R.sub.2 is a C.sub.1-4 alkyl radical and R.sub.3 represents a C.sub.1-4 fluoroalkyl radical are disclosed as herbicides.
    Type: Grant
    Filed: April 24, 1984
    Date of Patent: October 21, 1986
    Assignee: Monsanto Company
    Inventor: Len F. Lee
  • Substituted 4,6-alkoxy pyridinecarboxylate compounds and herbicidal use
    Patent number: 4609399
    Abstract: Disclosed herein are 4,6-dialkoxy 3-pyridine carboxylic acids and their derivatives which are useful as herbicides and herbicide intermediates.
    Type: Grant
    Filed: November 6, 1984
    Date of Patent: September 2, 1986
    Assignee: Monsanto Company
    Inventor: Len F. Lee
  • 2,4-Disubstituted-5-thiazole-carboxylic acids and derivatives
    Patent number: 4602937
    Abstract: 2,4-Disubstituted-5-thiazolecarboxylic acids and derivatives thereof have been found to reduce herbicidal injury of corn, rice and sorghum plants due to the application thereto of acetamide herbicides.
    Type: Grant
    Filed: March 16, 1984
    Date of Patent: July 29, 1986
    Assignee: Monsanto Company
    Inventors: Robert K. Howe, Len F. Lee
  • 2,4-disubstituted-5-thiazole-carboxylic acids and derivatives
    Patent number: 4602454
    Abstract: 2,4-Disubstituted-5-thiazolecarboxylic acids and derivatives thereof have been found to reduce herbicidal injury of corn, rice and sorghum plants due to the application thereto of acetamide herbicides.
    Type: Grant
    Filed: March 16, 1984
    Date of Patent: July 29, 1986
    Assignee: Monsanto Company
    Inventors: Robert K. Howe, Len F. Lee
  • 2,4-disubstituted-5-thiazole-carboxylic acids and derivatives
    Patent number: 4586948
    Abstract: 2,4-Disubstituted-5-thiazole-carboxylic acids and derivatives thereof have been found to reduce herbicidal injury of corn, rice and sorghum plants due to the application thereto of acetamide herbicides.
    Type: Grant
    Filed: March 16, 1984
    Date of Patent: May 6, 1986
    Assignee: Monsanto Company
    Inventors: Robert K. Howe, Len F. Lee
  • Herbicidal compositions and method
    Patent number: 4461642
    Abstract: The invention herein pertains to novel 2,5-bis-(perfluoroalkyl)-3,4-pyrroledicarboxylates and a method for their preparation. The novel pyrroles have been found to have utility as pre- and postemergent herbicides.
    Type: Grant
    Filed: March 8, 1982
    Date of Patent: July 24, 1984
    Assignee: Monsanto Company
    Inventors: Robert K. Howe, Len F. Lee
  • 2,4-Disubstituted-5-thiazole-carboxylic acids and derivatives
    Patent number: 4437876
    Abstract: 2,4-Disubstituted-5-thiazolecarboxylic acids and derivatives thereof have been found to reduce herbicidal injury of corn, rice and sorghum plants due to the application thereto of acetamide herbicides.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: March 20, 1984
    Assignee: Monsanto Company
    Inventors: Robert K. Howe, Len F. Lee
  • 2,4-Disubstituted-5-thiazole-carboxylic acids and derivatives
    Patent number: 4437875
    Abstract: 2,4-Disubstituted-5-thiazolecarboxylic acids and derivatives thereof have been found to reduce herbicidal injury of corn, rice and sorghum plants due to the application thereto of acetamide herbicides.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: March 20, 1984
    Assignee: Monsanto Company
    Inventors: Robert K. Howe, Len F. Lee