(19)

(11)

EP 0 452 405 A1

(12)

(43) Date of publication: 23.10.1991 Bulletin 1991/43 (21) Application number: 90902093.0 (22) Date of filing: 17.11.1989

(51) International Patent Classification (IPC):  D01F 6/ 62( . ) (86) International application number: PCT/US1989/005081 (87) International publication number: WO 1990/007592 (12.07.1990 Gazette 1990/16)

(84) Designated Contracting States: CH DE ES FR GB IT LI NL (30) Priority: 03.01.1989 US 19890292864 (71) Applicant: ALLIED-SIGNAL INC. Morristown, NJ 07942-2245 (US)	(72) Inventors: HAMLYN, Maxwell, Charles Cary, NC 27511 (US) LUCK, Thomas, Howard Sanford, NC 27330 (US) NELSON, Charles, Jay Chesterfield, VA 23236 (US) (74) Representative: Brock, Peter William, et al  Urquhart-Dykes & Lord 1 Richfield Place Richfield Avenue Reading RG1 8EQ Berkshire Reading RG1 8EQ Berkshire (GB)