(19)

(11)

EP 0 616 602 A1

(12)

(43) Date of publication: 28.09.1994 Bulletin 1994/39 (21) Application number: 93901327.0 (22) Date of filing: 11.12.1992

(51) International Patent Classification (IPC):  C01D 1/ 22( . ) C09C 1/ 02( . ) C01F 11/ 18( . ) D21H 21/ 52( . ) (86) International application number: PCT/US1992/010740 (87) International publication number: WO 1993/012038 (24.06.1993 Gazette 1993/15)

(84) Designated Contracting States: BE DE DK FR GR IT NL SE (30) Priority: 12.12.1991 US 19910806717 (71) Applicants: ADLER, Paul E. Macon, GA 31210 (US) DENHOLM, Charles B. Appleton, WI 54915 (US)	(72) Inventors: ADLER, Paul E. Macon, GA 31210 (US) DENHOLM, Charles B. Appleton, WI 54915 (US) (74) Representative: UEXKÜLL & STOLBERG  Patentanwälte Beselerstrasse 4 D-22607 Hamburg D-22607 Hamburg (DE)