(19)

(11)

EP 0 171 431 A1

(12)

(43) Date of publication: 19.02.1986 Bulletin 1986/08 (21) Application number: 85901187.0 (22) Date of filing: 06.02.1985

(51) International Patent Classification (IPC):  B01F 13/ 02( . ) (86) International application number: PCT/US1985/000181 (87) International publication number: WO 1985/003458 (15.08.1985 Gazette 1985/18)

(84) Designated Contracting States: AT BE CH DE FR GB LI NL SE (30) Priority: 06.02.1984 US 19840577276 (71) Applicant: PARKS, Richard E. Bellevue, WA 98004 (US)	(72) Inventor: PARKS, Richard E. Bellevue, WA 98004 (US) (74) Representative: Everitt, Christopher James Wilders, et al  F.J. CLEVELAND & COMPANY 40/43 Chancery Lane London WC2A 1JQ London WC2A 1JQ (GB)