(19)

(11)

EP 0 166 743 A1

(12)

(43) Date of publication: 08.01.1986 Bulletin 1986/02 (21) Application number: 84904303.0 (22) Date of filing: 15.11.1984

(51) International Patent Classification (IPC):  E02D 7/ 10( . ) (86) International application number: PCT/US1984/001863 (87) International publication number: WO 1985/002224 (23.05.1985 Gazette 1985/12)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 16.11.1983 US 19830552270 (71) Applicant: DEAN, Miles Anchorage, AK 99501 (US)	(72) Inventor: DEAN, Miles Anchorage, AK 99501 (US)