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. 01, 2005
Filed:
May. 07, 2002
Takashi Hasunuma, Narita, JP;
Naofumi Miyasaka, Chiba, JP;
Masatoshi Sakamoto, Narita, JP;
Takashi Sato, Chiba, JP;
Takashi Hasunuma, Narita, JP;
Naofumi Miyasaka, Chiba, JP;
Masatoshi Sakamoto, Narita, JP;
Takashi Sato, Chiba, JP;
Tyco Electronics Raychem K.K., Kanagawa, JP;
Abstract
A circuit protection arrangement particularly useful in protecting battery assemblies. The arrangement contains a first PTC device which has a first switching temperature T, has a resistance at 20° C. R, has a hold current at a first specified temperature I, and is made from a first PTC resistive element composed of a first conductive polymer composition attached to first and second electrodes, and a second PTC device which is electrically connected in series with the first PTC device, has a second switching temperature Twhich is less than T, has a resistance at 20° C. Rwhich is less than R, has a hold current at the first specified temperature Iwhich is greater than I, and is made from a second PTC resistive element composed of a second conductive polymer composition attached to third and fourth electrodes. Iequals Iat a critical temperature T, such that at temperatures below T, the first PTC device switches into a high resistance state and the circuit protection arrangement is resettable, and at temperatures greater than T, the second PTC device switches into a high resistance state and initiates an action causing the circuit protection arrangement to permanently open.