Patents by Inventor Wallace C. Petersen

Wallace C. Petersen 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).

  • Herbicidal pyridine N-oxide sulfonylureas
    Patent number: 4900353
    Abstract: This invention relates to pyridine N-oxide sulfonylurea herbicides, agriculturally suitable compositions containing them and their method-of-use as preemergent and/or postemergent herbicides or plant growth regulants.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: February 13, 1990
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: William E. Barnette, Thomas R. Dean, Wallace C. Petersen, Barry A. Wexler
  • Herbicidal pyridine N-oxide sulfonylureas
    Patent number: 4789465
    Abstract: This invention relates to pyridine N-oxide sulfonylurea herbicides, agriculturally suitable compositions containing them and their method-of-use as preemergent and/or postemergent herbicides or plant growth regulants.
    Type: Grant
    Filed: August 31, 1987
    Date of Patent: December 6, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William E. Barnette, Thomas R. Dean, Wallace C. Petersen, Barry A. Wexler
  • Herbicidal sulfonamides
    Patent number: 4743295
    Abstract: Thiocarbonylsulfonylureas, useful as herbicides and plant growth regulants, herbicidal compositions employing these compounds and methods of applying them to soil or directly to plants have been discovered.
    Type: Grant
    Filed: March 20, 1987
    Date of Patent: May 10, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wallace C. Petersen
  • Triazine-substituted herbicidal azobenzenesulfonamides
    Patent number: 4678497
    Abstract: Triazine-substituted azobenzenesulfonamides useful as preemergent and postemergent herbicides, selected from compounds of Formulae I or II ##STR1## or agriculturally suitable salts thereof, wherein R, R.sub.1, R.sub.2, R.sub.3 and A are as defined herein.
    Type: Grant
    Filed: January 13, 1986
    Date of Patent: July 7, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wallace C. Petersen
  • Herbicidal sulfonamides
    Patent number: 4675045
    Abstract: Thiocarbonylsulfonylureas, useful as herbicides and plant growth regulants, herbicidal compositions employing these compounds and methods of applying them to soil or directly to plants have been discovered.
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: June 23, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wallace C. Petersen
  • Herbicidal azobenzenesulfonamides
    Patent number: 4585470
    Abstract: Azobenzenesulfonamides such as 2-[4-(dimethylamino)phenylazo]-N-[(4-methoxy-6-methylpyrimidin-2-yl)aminoc arbonyl]benzenesulfonamide are useful as preemergent and postemergent herbicides.
    Type: Grant
    Filed: September 13, 1984
    Date of Patent: April 29, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wallace C. Petersen
  • Herbicidal sulfonamides
    Patent number: 4555261
    Abstract: This invention relates to a novel class of sulfonamides and their use as herbicides and plant growth regulants.
    Type: Grant
    Filed: November 1, 1984
    Date of Patent: November 26, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wallace C. Petersen
  • Herbicidal s-triazines
    Patent number: 4492599
    Abstract: This invention relates to novel urea and isourea compounds, agricultural compositions containing them and to their method of use as pre- and post- emergence herbicides and to plant growth regulants.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: January 8, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George Levitt, Wallace C. Petersen
  • Herbicidal sulfonamides
    Patent number: 4491467
    Abstract: This invention relates to a novel class of sulfonamides and their use as herbicides and plant growth regulants.
    Type: Grant
    Filed: July 12, 1982
    Date of Patent: January 1, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wallace C. Petersen
  • Process of preparing aromatic aldehydes by reacting selected aromatic compounds with formamidine acetate and an organic acid anhydride
    Patent number: 4394314
    Abstract: A process of reacting a ring carbon atom of an aromatic compound Ar with a compound of the formula H.sub.2 NCH.dbd.NH.sub.2.sup.+ CH.sub.3 CO.sub.2.sup.-, and an anhydride which has the ##STR1## at from 10.degree. to 200.degree. C. and preferably 25.degree. to 40.degree. C. to form a compound of the formula ##STR2## where m is 1, 2 or 3, and A is H or F. In the case where m is 1 the compound ##STR3## can be hydrolyzed to ArCHO.
    Type: Grant
    Filed: April 23, 1981
    Date of Patent: July 19, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wallace C. Petersen
  • Herbicidal ureas and isoureas
    Patent number: 4370480
    Abstract: This invention relates to novel urea and isourea compounds, agricultural compositions containing them and to their method of use as pre- and post-emergence herbicides and to plant growth regulants.
    Type: Grant
    Filed: December 4, 1980
    Date of Patent: January 25, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George Levitt, Wallace C. Petersen
  • Herbicidal sulfonamides
    Patent number: 4332611
    Abstract: Hydroxymethylbenzenesulfonamide derivatives have utility as agricultural chemicals and in particular as herbicides.
    Type: Grant
    Filed: May 12, 1981
    Date of Patent: June 1, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wallace C. Petersen