Patents by Inventor Edwin F. Hoff, Jr.

Edwin F. Hoff, Jr. 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).

  • Microencapsulated yellow polymorphic form of trifluralin
    Patent number: 5317004
    Abstract: Agriculturally active materials, such as pesticides, herbicides and the like and a process for microencapsulating said materials. The present invention includes trifluralin having a polymorphic form characterized by a yellow color and a melting point of approximately 41.degree.-43.degree. C. The present invention also includes a method of using the yellow polymorphic form of trifluralin as a herbicide. In addition, the present invention includes a method of microencapsulating low-melting agriculturally active materials, such as trifluralin. The microencapsulation process comprises the steps of heating a low-melting, water-immiscible, agriculturally active material to a molten state. The molten active material is then combined with an aqueous solution of a water-soluble, film-forming polymer at a temperature sufficient to maintain the active material in its molten state.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: May 31, 1994
    Assignee: Griffin Corporation
    Inventors: John Misselbrook, Larry J. McKinney, James H. Lefiles, Edwin F. Hoff, Jr., Elliot Bergman
  • Microencapsulated polymorphic agriculturally active material
    Patent number: 5160530
    Abstract: Agriculturally active materials, such as pesticides, herbicides and the like and a process for microencapsulating said materials. The present invention includes trifluralin having a polymorphic form characterized by a yellow color and a melting point of approximately 41.degree.-43.degree. C. The present invention also includes a method of using the yellow polymorphic form of trifluralin as a herbicide. In addition, the present invention includes a method of microencapsulating low-melting agriculturally active materials, such as trifluralin. The microencapsulation process comprises the steps of heating a low-melting, water-immiscible, agriculturally active material to a molten state. The molten active material is then combined with an aqueous soluion of a water-soluble, film-forming polymer at a temperature sufficient to maintain the active material in its molten state.
    Type: Grant
    Filed: January 24, 1989
    Date of Patent: November 3, 1992
    Assignee: Griffin Corporation
    Inventors: John Misselbrook, Edwin F. Hoff, Jr., Elliot Bergman, Larry J. McKinney, James H. LeFiles
  • Microencapsulated agriculturally active material
    Patent number: 5073191
    Abstract: Agriculturally active materials, such as pesticides, herbicides and the like and a process for microencapsulating said material. The present invention includes trifluralin having a polymorphic form characterized by a yellow color and a melting point of approximately 41.degree.-43.degree. C. The present invention also includes a method using the yellow polymorphic form of trifluralin as a herbicide. In addition, the present invention includes a method of microencapsulating low-melting agriculturally active materials, such as trifluralin. The microencapsulation process comprises the steps of heating a low-melting, water-immiscible, agriculturally active material to a molten state. The molten active material is then combined with an aqueous solution of a water-soluble, film-forming polymer at a temperature sufficient to maintain the active material in its molten state.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: December 17, 1991
    Assignee: Griffin Corporation
    Inventors: John Misselbrook, Edwin F. Hoff, Jr., Elliot Bergman, Larry J. McKinney, James H. Lefiles
  • Viscosity stabilized chloroprene-sulfur copolymers
    Patent number: 4250083
    Abstract: Viscosity stable chloroprene-sulfur copolymers are prepared by polymerizing chloroprene and sulfur in the presence of styrenated diphenyl amine. The presence of this material in the polymerization causes no discernible detriment to or degradation in the other properties of the copolymers.
    Type: Grant
    Filed: February 5, 1979
    Date of Patent: February 10, 1981
    Assignee: Denka Chemical Corporation
    Inventors: Gaylon T. Click, Nathan L. Turner, Edwin F. Hoff, Jr.