Patents by Inventor Chan-Cheong Siew

Chan-Cheong Siew 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).

  • Vacuum pump
    Patent number: 8186937
    Abstract: A turbomolecular vacuum pump (54) comprises a housing (70) and a rotor (52) supported by a bearing arrangement (64) for rotation relative to the housing (70). The bearing arrangement (64) comprises a bearing (72, 74, 76, 78) supported in both radial and axial directions by a resilient support (80) comprising inner (86) and outer (88) annular portions connected by a plurality of flexible members (84), the resilient support (80) having a radial stiffness in the range from 50 to 500 N/mm.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: May 29, 2012
    Assignee: Edwards Limited
    Inventors: Barrie Dudley Brewster, Chan-Cheong Siew
  • Vacuum Pump
    Publication number: 20100215475
    Abstract: A turbomolecular vacuum pump (54) comprises a housing (70) and a rotor (52) supported by a bearing arrangement (64) for rotation relative to the housing (70). The bearing arrangement (64) comprises a bearing (72, 74, 76, 78) supported in both radial and axial directions by a resilient support (80) comprising inner (86) and outer (88) annular portions connected by a plurality of flexible members (84), the resilient support (80) having a radial stiffness in the range from 50 to 500 N/mm.
    Type: Application
    Filed: May 26, 2006
    Publication date: August 26, 2010
    Inventors: Barrie Dudley Brewster, Chan-Cheong Siew