Patents by Inventor Conrad T. Harwell

Conrad T. Harwell 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).

  • Liquid herbicidal compositions and use thereof in a granular herbicide
    Patent number: 6825151
    Abstract: A concentrated, liquid herbicidal composition containing a low volatile ester of a first herbicide, a solid second herbicide comprising fluroxypyr in the form of a free acid and/or a solid ester, and an aprotic solvent is disclosed. A granular herbicide containing a solid substrate having the concentrated, liquid herbicidal composition applied to the substrate also is disclosed.
    Type: Grant
    Filed: April 22, 2003
    Date of Patent: November 30, 2004
    Assignee: Nufarm Americas Inc.
    Inventor: Conrad T. Harwell
  • Liquid herbicidal compositions and use thereof in a granular herbicide
    Publication number: 20030211943
    Abstract: A concentrated, liquid herbicidal composition containing a low volatile ester of a first herbicide, a solid second herbicide comprising fluroxypyr in the form of a free acid and/or a solid ester, and an aprotic solvent is disclosed. A granular herbicide containing a solid substrate having the concentrated, liquid herbicidal composition applied to the substrate also is disclosed.
    Type: Application
    Filed: April 22, 2003
    Publication date: November 13, 2003
    Inventor: Conrad T. Harwell
  • Liquid herbicidal compositions and use thereof in a granular herbicide
    Patent number: 6579831
    Abstract: A concentrated, liquid herbicidal composition is disclosed. The composition contains a low volatile ester of a first herbicide, a free acid form of a second herbicide, and an aprotic solvent. A granular herbicide containing a solid substrate having the concentrated, liquid herbicidal composition applied to surfaces of the substrate also is disclosed.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: June 17, 2003
    Assignee: Nufarms Americas Inc
    Inventor: Conrad T. Harwell
  • Method of manufacturing a dry water-soluble herbicidal salt composition
    Patent number: 5266553
    Abstract: A method of manufacturing a solid, water-soluble herbicidal composition comprising a water-soluble salt of a herbicidal compound is disclosed. The herbicidal compound is a water-insoluble compound that includes a carboxylic acid functionality, such as a phenoxy-substituted carboxylic acid compound or a substituted benzoic acid compound, and is sufficiently pure to form a dry, solid herbicidal salt composition after interaction with a suitable neutralizing base, such as ammonia, an alkylamine, a dialkylamine, a trialkylamine, a hydroxyalkylamine, a dihydroxyalkylamine, an alkaline salt of an alkali metal or a combination thereof. The dry herbicidal salt composition includes at least about 90% by weight of the water-soluble herbicidal salt, and dissolves rapidly and essentially completely in water to form an aqueous herbicidal solution including up to about 75% by weight of the water-soluble herbicidal salt.
    Type: Grant
    Filed: October 21, 1991
    Date of Patent: November 30, 1993
    Assignee: Riverdale Chemical Company
    Inventors: James K. Champion, Conrad T. Harwell