Patents by Inventor Harold Henry Nau

Harold Henry Nau 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).

  • Apparatus for coating particulate material with finely divided solids
    Patent number: 3938469
    Abstract: A method and apparatus is given for uniformly coating particulate fertilizer material with small amounts of finely divided micro and/or secondary nutrients by forming the particulate base fertilizer material in a falling curtain, spraying the base material with a binder solution, finally mixing in an agitated bed the base material with the finely divided nutrients, thus giving a product of micro and/or secondary nutrients uniformly distributed over the surfaces of the particulate base fertilizer.
    Type: Grant
    Filed: September 14, 1973
    Date of Patent: February 17, 1976
    Assignee: American Cyanamid Company
    Inventor: Harold Henry Nau