Patents by Inventor Mark Ernest Grist

Mark Ernest Grist 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).

  • Controlled release rate fertilizers and methods of making same
    Patent number: 6749659
    Abstract: A fertilizer granule comprises: i) an elemental sulfur and swelling clay matrix, and ii) at least one additional fertilizer material incorporated into said matrix.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: June 15, 2004
    Assignee: Enersul, Inc.
    Inventors: Zhimin Yu, James B. Hyne, Mark Ernest Grist