(19)

(11)

EP 0 191 051 A1

(12)

(43) Date of publication: 20.08.1986 Bulletin 1986/34 (21) Application number: 85903906.0 (22) Date of filing: 17.07.1985

(51) International Patent Classification (IPC):  F42B 39/ 22( . ) F42B 39/ 26( . ) (86) International application number: PCT/US1985/001347 (87) International publication number: WO 1986/001587 (13.03.1986 Gazette 1986/06)

(84) Designated Contracting States: DE FR GB (30) Priority: 22.08.1984 US 19840643269 (71) Applicant: HARSCO CORPORATION Camp Hill, PA 17011-8888 (US)	(72) Inventor: JOHNSON, Bruce, S. Dallastown, PA 17313 (US) (74) Representative: Ecrepont, Robert Pierre  12 Place Simon Vollant F-59800 Lille F-59800 Lille (FR)