(19)

(11)

EP 0 233 864 A1

(12)

(43) Date of publication: 02.09.1987 Bulletin 1987/36 (21) Application number: 85904532.0 (22) Date of filing: 30.08.1985

(51) International Patent Classification (IPC):  G01N 33/ 34( . ) (86) International application number: PCT/US1985/001654 (87) International publication number: WO 1987/001440 (12.03.1987 Gazette 1987/06)

(84) Designated Contracting States: DE FR GB SE (71) Applicant: WEYERHAEUSER COMPANY Tacoma, WA 98477 (US)	(72) Inventor: BERY, Yuri, A. Tukwila, WA 98188 (US)