Patents Assigned to The North American Manufacturing Company, Ltd.
  • Method and apparatus for melting metal
    Patent number: 7452400
    Abstract: An apparatus for melting a metal load includes a furnace having a melting chamber with a hearth and a molten metal outlet. The apparatus further includes non-regenerative burners that are operative to fire into the melting chamber, and regenerative burners that also are operative to fire into the melting chamber. The method includes the steps of firing non-regenerative burners into the chamber to provide heat for melting the load, and also firing regenerative burners into the chamber to provide heat for melting the load.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: November 18, 2008
    Assignee: The North American Manufacturing Company, Ltd.
    Inventors: Thomas F. Robertson, John N. Newby
  • Combustion method and apparatus
    Patent number: 7402038
    Abstract: A burner has a port facing into a combustion chamber along an axis. A secondary fuel injector structure has secondary fuel injection ports that face into the combustion chamber at locations spaced radially outward from the burner port. A tertiary fuel injector structure has tertiary fuel injection ports that face into the combustion chamber in directions perpendicular to the axis at locations spaced axially downstream from the secondary fuel injection ports.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: July 22, 2008
    Assignee: The North American Manufacturing Company, Ltd.
    Inventors: Thomas B. Neville, John J. Nowakowski, Mark C. Hannum, Thomas F. Robertson