Patents Represented by Attorney Keith Roberson
  • Patent number: 8318076
    Abstract: There are provided method and apparatus for the forming of three-dimensional objects in a layered fashion, wherein improvements are made to the support structure to improve the quality of the resulting three-dimensional objects. The support structure may include encapsulation along the interface boundary of the support-object interface to prevent or reduce the likelihood of separation of the build material, that forms the three-dimensional object, from the support material, that forms the support structure, or vice versa. The support structure may also or alternatively include both a porous support structure and a solid support structure to prevent or reduce the likelihood of separation of the support structure from the build platform and to improve the quality of the down-facing surfaces of the three-dimensional object. Methods are also provided for selectively depositing the support material and build material and for encapsulating the interface boundary with support material.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: November 27, 2012
    Assignee: 3D Systems, Inc.
    Inventors: Hongqing Vincent Wang, Pavan Kumar, John Stockwell, Khalil Moussa, Rajeev Kulkami
  • Patent number: 6886544
    Abstract: A system of operating an internal combustion engine is disclosed. The engine includes an engine block, an exhaust air system in fluid communication with the engine block, the exhaust air system having an exhaust air conduit, an intake air system in fluid communication with the engine block, the intake air system having an intake air conduit, and an intake air compressing device, an EGR system extending between the exhaust air system and the intake air system upstream of the intake air compressing device, and an ECM in communication with the EGR system. The EGR system includes an EGR injector, the EGR injector includes an EGR injector valve, an intermediate portion of intake air conduit, a throat portion positioned coaxially with the intermediate portion of intake air conduit.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: May 3, 2005
    Assignee: Caterpillar Inc
    Inventor: Yung T. Bui