Patents by Inventor David Da-Wei Zhang

David Da-Wei Zhang 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).

  • Impeller sealing arrangement
    Patent number: 6837677
    Abstract: A seal arrangement for an impeller assembly, the impeller assembly including an impeller housing (34) adapted to receive a drive shaft. An impeller (10) is located within the impeller housing (34) and is adapted for connection to the drive shaft for rotation by the drive shaft about an axis. The seal arrangement includes an annular seal (24) located axially between the impeller housing (34) and the impeller (10) to provide a substantially fluid tight seal between the impeller housing (34) and the impeller (10).
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: January 4, 2005
    Assignee: Davey Products Pty Ltd
    Inventors: David Da-Wei Zhang, Hugh Barr McDonald
  • Impeller sealing arrangement
    Publication number: 20040028524
    Abstract: A seal arrangement for an impeller assembly, the impeller assembly including an impeller housing (34) adapted to receive a drive shaft. An impeller (10) is located within the impeller housing (34) and is adapted for connection to the drive shaft for rotation by the drive shaft about an axis. The seal arrangement includes an annular seal (24) located axially between the impeller housing (34) and the impeller (10) to provide a substantially fluid tight seal between the impeller housing (34) and the impeller (10).
    Type: Application
    Filed: January 9, 2003
    Publication date: February 12, 2004
    Inventors: David Da-Wei Zhang, Hugh Barr McDonald