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:
Mar. 26, 2002
Filed:
Aug. 31, 1999
Jianhua Joyce Chen, Sunnyvale, CA (US);
Susan Melsa Jordan, Mountain View, CA (US);
Tyco Electronics Corporation, Middletown, PA (US);
Abstract
A circuit protection device is formed from a resistive element composed of a PTC conductive polymer composition and two electrodes. The conductive polymer composition contains ethylene/vinyl acetate copolymer having a vinyl acetate component of less than 30% by weight of the copolymer, and a melting point of at most 105° C. Devices of the invention have a resistive element thickness of 0.025 to 0.25 mm; a crosslinking level equivalent to 1 to 20 Mrads; a surface area of at most 120 mm ; a resistance at 20° C., R , of at most 0.050 ohm; and a PTC anomaly from 20° C. to (T +5° C.) of at least 10 . The devices can be used as part of an assembly in which the device is in contact with a battery, e.g. a rechargeable battery.