(19)

(11)

EP 0 038 358 A1

(12)

(43) Date of publication: 28.10.1981 Bulletin 1981/43 (21) Application number: 80902263.0 (22) Date of filing: 31.10.1980

(51) International Patent Classification (IPC):  E02D 13/ 10( . ) (86) International application number: PCT/US1980/001474 (87) International publication number: WO 1981/001262 (14.05.1981 Gazette 1981/12)

(84) Designated Contracting States: DE FR GB NL SE (30) Priority: 31.10.1979 US 19790089780 (71) Applicant: FREDERICK, Leonard L. Whippany, NJ 07981 (US)	(72) Inventor: FREDERICK, Leonard L. Whippany, NJ 07981 (US) (74) Representative: Chenard, René Marcel  57 rue de Clichy F-75009 Paris F-75009 Paris (FR)