(19)

(11)

EP 0 463 158 A1

(12)

(43) Date of publication: 02.01.1992 Bulletin 1992/01 (21) Application number: 91904838.0 (22) Date of filing: 15.01.1991

(51) International Patent Classification (IPC):  E02F 5/ 10( . ) (86) International application number: PCT/US1991/000421 (87) International publication number: WO 1991/011564 (08.08.1991 Gazette 1991/18)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 16.01.1990 US 19900465838 09.11.1990 US 19900610906 (71) Applicant: PARKS, James Marshall Lexington, KY 40502 (US)	(72) Inventor: PARKS, James Marshall Lexington, KY 40502 (US) (74) Representative: Crisp, David Norman, et al  D. YOUNG & CO. 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)