Zinc phosphate coating for varistor

Details Zinc phosphate coating for varistor Zinc phosphate coating for varistor

1997-01-22

1998-05-26

Walberg, Teresa J.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 20, H01C 710

Patent

active

057572631

ABSTRACT:
Method of providing a semiconductor device with an inorganic electrically insulative layer, the device having exposed semiconductor surfaces and electrically conductive metal end terminations, in which the device is reacted with phosphoric acid to form a phosphate on the exposed surfaces of the semiconductor but not on the metal end terminations, and in which the device is thereafter barrel plated in a conventional electrical barrel plating process and the plating is provided only on the end terminations because the phosphate is not electrically conductive.

REFERENCES:
patent: 4046847 (1977-09-01), Kresge
patent: 4371860 (1983-02-01), May et al.
patent: 5075665 (1991-12-01), Taira et al.
patent: 5115221 (1992-05-01), Cowman
patent: 5307046 (1994-04-01), Alim

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