Coated varistor

Details Coated varistor Coated varistor

2005-09-13

2005-09-13

Easthom, Karl D. (Department: 2832)

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

C338S021000

Reexamination Certificate

active

06943659

ABSTRACT:
A varistor includes a varistor element, a first layer which is porous on the varistor element, and a second layer on th first coating. The thickness t (mm) of the second layer is not smaller than 1.3/V. where V(ml/g) is the volume of pores of the first layer exposed to an outside of the first layer. This varistor includes the outer layers protected from being broken even when a non-ohmic interface in a voltage non-linear resistor is broken down with a voltage exceeding a rated level.

REFERENCES:
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patent: 4933659 (1990-06-01), Imai et al.
patent: 5192834 (1993-03-01), Yamanishi et al.
patent: 6541066 (2003-04-01), Geus
patent: 2001/0003358 (2001-06-01), Terase et al.
patent: 55-46513 (1980-04-01), None
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patent: 2002-159826 (2002-06-01), None
English Translation for JP 63-47901, Yodgawa Feb. 1988.
International Search Report for PCT/JP2003/007979, dated Oct. 7, 2003.

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