The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 2013
Filed:
Jun. 25, 2012
Kuo Chang Lo, New Taipei, TW;
Yao Te Chang, Linnei Township, Yunlin County, TW;
Ya Fang Liang, Taichung, TW;
Yi an Sha, Xindian, TW;
David Shau Chew Wang, Taipei, TW;
Kuo Chang Lo, New Taipei, TW;
Yao Te Chang, Linnei Township, Yunlin County, TW;
Ya Fang Liang, Taichung, TW;
Yi An Sha, Xindian, TW;
David Shau Chew Wang, Taipei, TW;
Polytronics Technology Corp., Hsinchu, TW;
Abstract
An over-current protection device includes two metal foils and a PTC material layer. The PTC material layer is laminated between the two metal foils and has a resistivity less than 0.4 Ω-cm. The PTC material layer includes crystalline polymer and electrically conductive ceramic filler dispersed in the crystalline polymer. The conductive ceramic filler is of HCP structure and includes 70-95% by weight of the PTC material layer. The trip jump value of the over-current protection device after 300 times trip is less than or equal to 25. The resistance repeatability of the device can be effectively improved by adding the conductive ceramic filler.