Patents by Inventor Geoffrey H. Evans

Geoffrey H. Evans 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).

  • Continuous process for the partial sterilization of mushroom casing
    Patent number: 4978501
    Abstract: A process and apparatus are provided for the sterilization of horticultural material, which may be substrate, fertilizer, peat or especially mushroom casing. The sterilization may be complete or may be partial, removing only harmful organisms while leaving beneficial organisms unharmed. The horticultural material is passed through a tunnel and is exposed to radiofrequency electromagnetic waves for a period sufficient for sterilization. In a preferred process and apparatus the horticultural material is heated to a suitable temperature by the waves and is then maintained in a region not exposed to the waves for a period long enough to sterilize the material, before allowing it to cool to ambient temperature.
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: December 18, 1990
    Assignee: Minister of Agriculture, Fisheries & Food, etc.
    Inventors: Michael F. Diprose, Geoffrey H. Evans