(19)

(11)

EP 0 674 730 A1

(12)

(43) Date of publication: 04.10.1995 Bulletin 1995/40 (21) Application number: 94903584.0 (22) Date of filing: 09.12.1993

(51) International Patent Classification (IPC):  B01F 7/ 04( . ) D21C 9/ 10( . ) B01J 19/ 18( . ) D21C 9/ 153( . ) (86) International application number: PCT/US1993/012035 (87) International publication number: WO 1994/015017 (07.07.1994 Gazette 1994/15)

(84) Designated Contracting States: AT DE SE (30) Priority: 18.12.1992 US 19920992986 (71) Applicant: THE INGERSOLL-RAND COMPANY Wickliffe Lake, NJ 07675-8738 (US)	(72) Inventors: CARLSMITH, L., Allan 59 New Boston Road Amherst, NH 03031 (US) MURPHY, Patrick, D. Nashua, NH 03060 (US) LUTHI, Oscar Nashua, NH 03062 (US) (74) Representative: Feakins, Graham Allan, et al  RAWORTH, MOSS & COOK RAWORTH HOUSE 36 Sydenham Road Croydon, Surrey CRO 2EF Croydon, Surrey CRO 2EF (GB)