Patents by Inventor Otto H. Mueller

Otto H. Mueller 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 fertilizer
    Patent number: 4023955
    Abstract: A solid controlled release fertilizer of a discrete particle of a fertilizer material encapsulated within a coating of partially hydrated cement is provided. In a preferred embodiment, the partially hydrated cement coated fertilizer particle is encapsulated within a thin semipermeable elastomer coating. In another embodiment, the thin semipermeable elastomer is in turn encapsulated within a second partially hydrated cement coating which contains micronutrient trace elements.
    Type: Grant
    Filed: October 4, 1974
    Date of Patent: May 17, 1977
    Assignee: General Portland, Inc.
    Inventor: Otto H. Mueller