Patents by Inventor Robert S. Charlton

Robert S. Charlton 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).

  • Refiner plates
    Patent number: 4423845
    Abstract: An improvement in refiner discs for mechanical pulping of wood and other material is disclosed which increases wood pulp production. The improvement has at least one refiner plate set mounted on a disc to form a pair of opposing refiner plate sets. The one refiner plate set has a series of hard spots placed at different radial distances on the surface. In one process of manufacturing the plate set, a series of locations are hardened, preferably by spot welding or spot hardening on at least one raised portion of the plate set.
    Type: Grant
    Filed: May 12, 1981
    Date of Patent: January 3, 1984
    Assignee: MacMillan Bloedel Limited
    Inventors: William C. Frazier, Robert S. Charlton