(19)

(11)

EP 0 882 223 A1

(12)

(43) Date of publication: 09.12.1998 Bulletin 1998/50 (21) Application number: 97946502.0 (22) Date of filing: 03.11.1997

(51) International Patent Classification (IPC):  G01N 15/ 06( . ) G01N 21/ 53( . ) G01N 15/ 02( . ) G01N 15/ 00( . ) (86) International application number: PCT/US1997/020047 (87) International publication number: WO 1998/020320 (14.05.1998 Gazette 1998/19)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB IE IT LI NL SE Designated Extension States: SI (30) Priority: 04.11.1996 US 19960743554 04.11.1996 US 19960743555 (71) Applicant: Certainteed Corporation Valley Forge, Pennsylvania 19482-0101 (US)	(72) Inventor: ENCE, Brian, M. Lansdale, PA 19446 (US) (74) Representative: Hertz, Oliver, Dr.  v. Bezold & Partner, Brienner Strasse 52 80333 München 80333 München (DE)