Process of preventing visual access to a semiconductor device by

Details Process of preventing visual access to a semiconductor device by Process of preventing visual access to a semiconductor device by

1993-01-15

1993-11-02

Hearn, Brian E.

Fishing, trapping, and vermin destroying

437236, 437235, 437240, 437982, 148DIG133, H01L 2102

Patent

active

052583341

ABSTRACT:
Reverse engineering of integrated circuit devices is prevented by denying visual access to the topology of an integrated circuit device. Visual access is denied by coating the device with an opaque ceramic. The opaque ceramic is produced by first mixing opaque particulate with a silica precursor. The mixture is then applied to the surface of the integrated circuit device. The coated device is heated to a temperature in the range of 50.degree. C. to 450.degree. C. in an inert environment for a time within the range of 1 second to 6 hours to allow the coating to flow across the surface of the device without ceramifying. The coated device is then heated to a temperature in the range of 20.degree. C. to 1000.degree. C. in a reactive environment for a time in the range of 2 to 12 hours to allow the coating to ceramify. The result is an integrated circuit device that is coated with opaque ceramic which prevents visual access to the underlying circuitry of the integrated circuit device while providing the device with protection against environmental stresses, ionic contamination, and mechanical abrasion.

REFERENCES:
patent: 3770498 (1973-11-01), Flowers
patent: 4133690 (1979-01-01), Muller
patent: 4544576 (1985-10-01), Chu et al.
patent: 4756977 (1988-07-01), Haluska et al.
patent: 5059448 (1991-10-01), Chandra et al.
patent: 5145723 (1992-09-01), Ballance et al.
Emerging Technologies, U.S. Dept. of Commerce, Spring 1990.

Affiliated with

Also associated with

Rating

Process of preventing visual access to a semiconductor device by does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process of preventing visual access to a semiconductor device by, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of preventing visual access to a semiconductor device by will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1757305