(19)

(11)

EP 0 756 515 A1

(12)

(43) Date of publication: 05.02.1997 Bulletin 1997/06 (21) Application number: 94916539.0 (22) Date of filing: 19.04.1994

(51) International Patent Classification (IPC):  B01F 1/ 00( . ) C22B 15/ 00( . ) (86) International application number: PCT/US1994/004257 (87) International publication number: WO 1995/028223 (26.10.1995 Gazette 1995/46)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (71) Applicant: HICKSON KERLEY, INC Phoenix, AZ 85017 (US)	(72) Inventors: BUZA, Thomas, B. Tucson, AZ 85710 (US) KLING, Heinrich Tucson, AZ 85710 (US) NEYLON, Rick, James Scottsdale, AZ 85260 (US) WILSON, Joseph, P. Tubac, AZ 85646 (US) (74) Representative: Dean, John Paul, et al  Withers & Rogers 4 Dyer's Buildings Holborn London EC1N 2JT London EC1N 2JT (GB)