Magnetic ink and method for manufacturing and sifting out of def

Details Magnetic ink and method for manufacturing and sifting out of def Magnetic ink and method for manufacturing and sifting out of def

1996-06-07

1998-09-22

Niebling, John

Fishing, trapping, and vermin destroying

437226, H01L 21302, H01L 2166, H01L 21463, G01R 3126

Patent

active

058113142

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.

REFERENCES:
patent: 3507389 (1970-04-01), Casner et al.
patent: 3572400 (1971-03-01), Casner et al.
patent: 3583561 (1971-06-01), Wiesler
patent: 3623603 (1971-11-01), Casner et al.
patent: 3692168 (1972-09-01), Hughes, Jr. et al.
patent: 3863764 (1975-02-01), Myslinski et al.
patent: 4071944 (1978-02-01), Chuss et al.
patent: 4472218 (1984-09-01), Avedissian et al.

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