Patents by Inventor Douglas P. Leu

Douglas P. Leu 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).

  • Casting of engine blocks
    Patent number: 6615901
    Abstract: An engine block mold package includes a barrel crankcase core having a plurality of barrels on each of which a respective cylinder bore liner is disposed. Each cylinder bore liner includes an inside diameter that is tapered along at least a portion of its length to match a draft angle present on the barrels to permit removal of the barrel crankcase core from a core box in which it is formed.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: September 9, 2003
    Assignee: General Motors Corporation
    Inventors: Brian D. Kaminski, Douglas P. Leu, Norman L. Neuenschwander
  • Casting of engine blocks
    Patent number: 6598655
    Abstract: An engine block mold package includes a barrel crankcase core having a plurality of barrels on an integral crankcase region and one or more locator surfaces on the crankcase region. The barrels are formed by a barrel-forming tool element of a core box. The barrel-forming tool element is configured to also form the locator surface(s) on the crankcase region such that the locator surface(s) is/are accurately positioned relative to the barrels and thus the cylinders formed in the engine block cast in the mold package. The locator surface(s) can be used to locate the engine block casting in subsequent aligning and machining operations without the need to reference a curved surface of a cylinder bore liner.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: July 29, 2003
    Assignee: General Motors Corporation
    Inventors: Thomas P. Newcomb, Larry R. Shade, Douglas P. Leu
  • Casting of engine blocks
    Publication number: 20020185242
    Abstract: An engine block mold package includes a barrel crankcase core having a plurality of barrels on an integral crankcase region and one or more locator surfaces on the crankcase region. The barrels are formed by a barrel-forming tool element of a core box. The barrel-forming tool element is configured to also form the locator surface(s) on the crankcase region such that the locator surface(s) is/are accurately positioned relative to the barrels and thus the cylinders formed in the engine block cast in the mold package. The locator surface(s) can be used to locate the engine block casting in subsequent aligning and machining operations without the need to reference a curved surface of a cylinder bore liner.
    Type: Application
    Filed: June 11, 2001
    Publication date: December 12, 2002
    Inventors: Thomas P. Newcomb, Larry R. Shade, Douglas P. Leu
  • Casting of engine blocks
    Publication number: 20020185251
    Abstract: An engine block mold package includes a barrel crankcase core having a plurality of barrels on each of which a respective cylinder bore liner is disposed. Each cylinder bore liner includes an inside diameter that is tapered along at least a portion of its length to match a draft angle present on the barrels to permit removal of the barrel crankcase core from a core box in which it is formed.
    Type: Application
    Filed: June 11, 2001
    Publication date: December 12, 2002
    Inventors: Brian D. Kaminski, Douglas P. Leu, Norman L. Neuenschwander