Patents by Inventor Dwane H. Campbell

Dwane H. Campbell 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).

  • Ammonium glyphosate compositions and process for their preparation
    Patent number: 6734142
    Abstract: A process is provided for preparing a downstream processable ammonium glyphosate paste. The process includes mixing in a reactor (i) particulate glyphosate acid, (ii) ammonia, (iii) adjuvant, and (iii) water. The reaction of glyphosate acid with ammonia causes the generation of heat resulting in the partial evaporation of the water such that an ammonium glyphosate paste is formed, having a moisture content of about 2% to about 20% by weight. The addition of the adjuvant to the reactor (i) increases the rate at which the glyphosate acid and ammonia react to form ammonium glyphosate and/or (ii) reduces the flow resistance of the reaction mass as it is being conveyed to the product discharge region of the reactor. The ammonium glyphosate paste may then be further processed to form a granular herbicidal composition.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: May 11, 2004
    Assignee: Monsanto Technology LLC
    Inventors: Brent D. Massmann, John T. Wang, Dwane H. Campbell
  • Ammonium glyphosate compositions and process for their preparation
    Publication number: 20020173423
    Abstract: A process is provided for preparing a downstream processable ammonium glyphosate paste. The process includes mixing in a reactor (i) particulate glyphosate acid, (ii) ammonia, (iii) adjuvant, and (iii) water. The reaction of glyphosate acid with ammonia causes the generation of heat resulting in the partial evaporation of the water such that an ammonium glyphosate paste is formed, having a moisture content of about 2% to about 20% by weight. The addition of the adjuvant to the reactor (i) increases the rate at which the glyphosate acid and ammonia react to form ammonium glyphosate and/or (ii) reduces the flow resistance of the reaction mass as it is being conveyed to the product discharge region of the reactor. The ammonium glyphosate paste may then be further processed to form a granular herbicidal composition.
    Type: Application
    Filed: April 15, 2002
    Publication date: November 21, 2002
    Applicant: Monsanto Technology LLC
    Inventors: Brent D. Massmann, John T. Wang, Dwane H. Campbell