(19)

(11)

EP 1 751 319 A1

(12)

(43) Date of publication: 14.02.2007 Bulletin 2007/07 (21) Application number: 05764922.0 (22) Date of filing: 26.04.2005

(51) International Patent Classification (IPC):  C21D 9/56(2006.01) (86) International application number: PCT/KR2005/001189 (87) International publication number: WO 2005/113843 (01.12.2005 Gazette 2005/48)

(84) Designated Contracting States: BE (30) Priority: 20.05.2004 KR 2004035973 (71) Applicants: Korea Toho Co., Ltd. Gyeongsangbuk-do 780-912 (KR) Kabushikikaisha Ask Technica Corporation Yamanashi 409-3601 (JP)	(72) Inventors: SONG, Hwa Woong Gyeongsangbuk-do 780-912 (KR) HIRAKURI, Kanji, c/o Ask Technica Corporation Yamanashi 409-3601 (JP) (74) Representative: Le Forestier, Eric et al Cabinet Régimbeau 20, rue de Chazelles 75847 Paris cedex 17 75847 Paris cedex 17 (FR)