Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Reexamination Certificate
2006-05-25
2009-06-02
Lee, Kyung (Department: 2832)
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
C338S020000, C361S311000
Reexamination Certificate
active
07541910
ABSTRACT:
A multilayer zinc oxide varistor without bismuth oxide system ingredients, and having variable breakdown voltages by controlling the thickness of the ceramic material; the varistor is bismuth-free and composed of zinc oxide as the primary constituent with alkaline earth element (Ba) as first additive, at least one of transition elements of Mn, Co, Cr, or Ni as second additives, at least one of rare earth elements of Pr, La, Ce, Nd or Tb as third additives and at least one of B, Si, Se, Al, Ti, W, Sn, Sb, Na, or K as rest additives, and the bismuth-free and zinc oxide based varistor exhibits an excellent ESD (Electro-Static Discharge) withstanding characteristic.
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Kuo Cheng-Tsung
Lien Wei-Cheng
Lin Jun-Nun
Zhang Li-Yun
Zhu Jie-An
Bacon & Thomas PLLC
Lee Kyung
SFI Electronics Technology Inc.
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