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(11)

EP 1 651 387 A1

(12)

(43) Date of publication: 03.05.2006 Bulletin 2006/18 (21) Application number: 04779872.3 (22) Date of filing: 29.07.2004

(51) International Patent Classification (IPC):  B24B 37/04(1968.09) B24D 13/14(1968.09) (86) International application number: PCT/US2004/024941 (87) International publication number: WO 2005/016597 (24.02.2005 Gazette 2005/08)

(84) Designated Contracting States: BE DE FR GB IE NL (30) Priority: 07.08.2003 US 493292 P 26.07.2004 US 898258 (71) Applicant: PPG Industries Ohio, Inc. Cleveland, OH 44111 (US)	(72) Inventors: SWISHER, Robert, G. Pittsburgh, Pennsylvania 15238 (US) WANG, Alan, E. Gibsonia, Pennsylvania 15044 (US) (74) Representative: Sternagel, Fleischer, Godemeyer & Partner  Braunsberger Feld 29 51429 Bergisch Gladbach 51429 Bergisch Gladbach (DE)