Patents by Inventor Sing-Yuen Chong

Sing-Yuen Chong 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).

  • Safety cutter
    Patent number: 5497553
    Abstract: A safety cutter is provided to prevent un-actuated blade release. The cutter comprises a housing within which a slidable blade can be completely concealed. The blade is connected to a sliding member which controls blade movement in and out of the housing. A safety device is provided having a handle, a main plate and protuberances on the sides such that the sides of the safety device are complementary to the sides of an opening made on one surface of the cutter along which sides the sliding member is movable.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: March 12, 1996
    Assignee: Twin Base Limited
    Inventor: Sing-Yuen Chong
  • Cutter
    Patent number: D458106
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: June 4, 2002
    Assignee: Tung Hing Products Company Limited
    Inventor: Sing-Yuen Chong
  • Cutter
    Patent number: D459189
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: June 25, 2002
    Assignee: Tung Hing Products Company Limited
    Inventor: Sing-Yuen Chong
  • Cutter
    Patent number: D528896
    Type: Grant
    Filed: September 2, 2005
    Date of Patent: September 26, 2006
    Assignee: Tung Hing Products Company Limited
    Inventor: Sing-Yuen Chong
  • Cutter
    Patent number: D410832
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: June 8, 1999
    Assignee: Twin Base Limited
    Inventor: Sing-Yuen Chong
  • Cutter
    Patent number: D414394
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: September 28, 1999
    Assignee: Twin Base Limited
    Inventor: Sing-Yuen Chong