Patents by Inventor William G. Crabtree

William G. Crabtree 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).

  • Sulfur containing isocyanate compositions
    Patent number: 6152981
    Abstract: This invention relates to an isocyanate composition comprising a) at least one isocyanate and b) from 1 to 50% by weight, based on the total weight of component a), of sulfur. These isocyanate compositions are suitable for the preparation of polyurethane/polyurea encapsulated fertilizers. Accordingly, the present invention also relates to an improved process for the production of a polyurea/polyurethane encapsulated fertilizer comprising applying at least one isocyanate-reactive component to the fertilizer particles and applying the isocyanate compositions of the present invention to the fertilizer particles, to form these polyurea/polyurethane encapsulated fertilizers.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: November 28, 2000
    Assignee: Bayer Corporation
    Inventors: Peter H. Markusch, Donald MacNaughtan, Jr., William G. Crabtree, Robert L. Cline