Patents by Inventor John Robert Derrick

John Robert Derrick 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).

  • Material screening systems
    Patent number: 7861867
    Abstract: A reconfigurable grizzly-type system providing improved field processing of ore, rock, and soil. The system provides reconfigurable screening of rocks, rubble, gravel, and debris from soil based on material size. The system also provides improvements related to efficient storage and transportation.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: January 4, 2011
    Inventor: John Robert Derrick