(19)

(11)

EP 0 586 578 A1

(12)

(43) Date of publication: 16.03.1994 Bulletin 1994/11 (21) Application number: 92913273.0 (22) Date of filing: 28.05.1992

(51) International Patent Classification (IPC):  B67D 7/ 72( . ) F17C 13/ 04( . ) F16K 31/ 06( . ) (86) International application number: PCT/US1992/004638 (87) International publication number: WO 1992/021905 (10.12.1992 Gazette 1992/31)

(84) Designated Contracting States: CH DE DK ES FR GB GR IT LI NL SE (30) Priority: 30.05.1991 US 19910707504 08.05.1992 US 19920880568 (71) Applicants: WASS, Lloyd G. Eagan, MN 55112 (US) BAIRD, Michael R. Delaware, OH 43015 (US)	(72) Inventors: WASS, Lloyd, G. Eagan, MN 55112 (US) BAIRD, Michael, R. Delaware, OH 43015 (US) NELSON, Peter, R. Bloomington, MN 55431 (US) (74) Representative: Fry, Alan Valentine, et al  FRY HEATH & SPENCE The Old College 53 High Street Horley Surrey RH6 7BN Horley Surrey RH6 7BN (GB)