Patents by Inventor William Dean Mathis

William Dean Mathis 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).

  • Method to produce pesticide suspension concentrates
    Patent number: 6541426
    Abstract: The present invention relates to a method to produce suspension concentrates of pesticides, pharmaceuticals, biocides, and similar materials, using a melt emulsification process. The method is particularly applicable to pesticides which have a low water solubility. The particle size can be controlled to give particles from less than 5 microns (&mgr;) to less than 1&mgr;.
    Type: Grant
    Filed: May 31, 2000
    Date of Patent: April 1, 2003
    Assignee: Rohm and Haas Company
    Inventors: Edward Charles Kostansek, William Dean Mathis
  • Stable pesticide dispersions
    Patent number: 6210696
    Abstract: Stable dispersions of certain pesticides in agricultural oil are provided. In particular, the dispersions include a particulate pesticide, agricultural oil, and an agricultural oil-soluble polymer, the polymer in some instances containing a copolymerized polar monomer. Also provided is a method for forming the stable dispersion.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: April 3, 2001
    Assignee: Rohm and Haas Company
    Inventors: Robert Howard Gore, Richard David Houghton, Warren Harvey Machleder, William Dean Mathis, Luong Tu Nguyen, Bridget Marie Stevens, Yan Sun
  • Pesticide compositions
    Patent number: 6146652
    Abstract: The present invention relates to pesticide compositions in which at least one of the components of the composition is a polymeric material which reduces the rate of crystallization of the pesticide active ingredient in the composition. This invention also provides a method for reducing the rate of crystallization of pesticide active ingredients and a method for controlling pests comprising applying to the pest the polymer-containing composition.
    Type: Grant
    Filed: April 7, 1998
    Date of Patent: November 14, 2000
    Assignee: Rohm and Haas Company
    Inventors: Robert Howard Gore, Ronald Joseph Kopko, Warren Harvey Machleder, William Dean Mathis, Bridget Marie Stevens, Yan Sun