Patents by Inventor Roy D. Holtham

Roy D. Holtham 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).

  • Ash handling systems for combustion equipment
    Patent number: 4628828
    Abstract: An ash handling system includes a conveyor and crusher extending from an ash collection trough beneath an underfeed stoker retort to a hopper from which ash is discharged into an ash receiving zone of a container. A suction nozzle is used to extract ash from the zone for disposal.
    Type: Grant
    Filed: November 6, 1984
    Date of Patent: December 16, 1986
    Assignee: Coal Industry (Patents) Limited
    Inventors: Roy D. Holtham, Anthony J. Falconer, John F. G. Grainger