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EP 2 655 677 A1

(12)

(43) Date of publication: 30.10.2013 Bulletin 2013/44 (21) Application number: 11815567.0 (22) Date of filing: 21.12.2011

(51) International Patent Classification (IPC):  C21D 9/52(2006.01) C21D 9/64(2006.01) C21D 9/573(2006.01) B21C 37/04(2006.01) (86) International application number: PCT/IB2011/003144 (87) International publication number: WO 2012/085651 (28.06.2012 Gazette 2012/26)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 23.12.2010 IT MI20102385 11.02.2011 US 201161441858 P (71) Applicant: Pirelli Tyre S.P.A. 20126 Milan (IT)	(72) Inventors: AGRESTI, Simone I-20126 Milan (IT) CIANCIOSI, Federico I-20126 Milan (IT) PIERALLI, Andrea I-20126 Milan (IT) (74) Representative: Checcacci, Giorgio  Porta, Checcacci & Associati S.p.A. Via Trebbia 20 20135 Milano 20135 Milano (IT)