Patents Assigned to Sigma Resources Ltd.
  • Hand lamp
    Patent number: D404510
    Type: Grant
    Filed: April 1, 1998
    Date of Patent: January 19, 1999
    Assignee: Sigma Resources Ltd.
    Inventor: Chuck-Fun Cheng
  • Hand lamp
    Patent number: D424223
    Type: Grant
    Filed: May 5, 1998
    Date of Patent: May 2, 2000
    Assignee: Sigma Resources Ltd.
    Inventor: Cheng Chuck Fun