Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tai Kuang Hei0
David Shau Chew Wang0
Kuo Chang Lo0
Yi An Sha0
Date of Patent
May 21, 2013
Patent Application Number
13235663
Date Filed
September 19, 2011
Patent Citations Received
Patent Primary Examiner
Patent abstract
An over-current protection device includes two metal foils and a PTC material layer laminated therebetween. The PTC material layer has a volume resistivity between 0.07 Ω-cm and 0.32 Ω-cm. The PTC material layer includes a crystalline polymer, a conductive ceramic carbide filler of a particle size between 0.1 μm and 50 μm and a volume resistivity less than 0.1 Ω-cm, and a carbon black filler. The weight ratio of the carbon black filler to the conductive ceramic carbide filler is between 1:90 and 1:4. The conductive ceramic carbide filler and the carbon black filler are dispersed in the crystalline polymer. The resistance ratio R100/Ri is between 3 and 20.
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