Patents by Inventor Siew Kong Wong

Siew Kong Wong 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).

  • Method and apparatus for reducing warpage in semiconductor packages
    Patent number: 6013541
    Abstract: An apparatus and method for reducing warpage in semiconductor packages, and in particular, thin quad flat packages (TQFPs). The apparatus includes a clamping jig having a bottom plate and an upper plate. The bottom plate is connected to a heater which heats the plate to approximately 50 to 70 degrees Celsius. An air supply controller delivers air supply to the upper plate. The TQFPs are placed in between the bottom plate and the upper plate immediately after they have been encapsulated with resin and the resin has cured. The clamping jig clamps the TQFPs in between the bottom and upper plate with a slight force. The TQFPs remain in the clamping jig until they have sufficiently cooled.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: January 11, 2000
    Assignee: Advanced Systems Automation Limited
    Inventors: Kok Ping Tan, Siew Kong Wong