Patents by Inventor Hahnjong Hsiung

Hahnjong Hsiung 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).

  • Magnetic ink and method for manufacturing and sifting out of defective dice by using the same
    Patent number: 5811314
    Abstract: A method for dice manufacturing and sifting out of defective dice by using a magnet includes the following steps: applying magnetic ink onto defective dice; hardening to ink dot on said defective dice; removing the adhesive tape from the dice; removing defective dice through the use of the magnet. Said ink preferably comprises approximately 60%-95% percentage by weight ferromagnetic powder and 40%-5% percentage by weight thermoset resin. By using the magnetic ink and the magnetic separation method, the automation of dice manufacturing can be improved and thereby productivity is increased.
    Type: Grant
    Filed: June 7, 1996
    Date of Patent: September 22, 1998
    Assignee: General Instrument of Taiwan, Ltd.
    Inventors: Yi-Ching Chen, Hahnjong Hsiung, William J. Nelson, Christopher M. Knowles