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EP 1 660 805 A1

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(43) Date of publication: 31.05.2006 Bulletin 2006/22 (21) Application number: 04771606.3 (22) Date of filing: 06.08.2004

(51) International Patent Classification (IPC):  F17C 1/02(1968.09) H01M 8/04(1974.07) B23K 20/12(1980.01) H01M 8/00(1974.07) (86) International application number: PCT/JP2004/011631 (87) International publication number: WO 2005/015074 (17.02.2005 Gazette 2005/07)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 08.08.2003 JP 2003290432 21.08.2003 US 496672 P (71) Applicant: Showa Denko K.K. Tokyo 105-8518 (JP)

(72) Inventors: KANNO, Yasuharu, SHOWA DENKO K.K. Oyama-shi, Tochigi 3238678 (JP) YAMASAKI, Hideyo, SHOWA DENKO K.K. Oyama-shi, Tochigi 3238678 (JP) KAWAMATA, Yasuji, SHOWA DENKO K.K. Oyama-shi, Tochigi 3238678 (JP) OSAME, Yasuhiro, SHOWA DENKO K.K. Oyama-shi, Tochigi 3238678 (JP) (74) Representative: Joly, Jean-Jacques  Cabinet Beau de Loménie 158, rue de l'Université 75340 Paris Cédex 07 75340 Paris Cédex 07 (FR)