(19)

(11)

EP 0 099 884 A1

(12)

(43) Date of publication: 08.02.1984 Bulletin 1984/06 (21) Application number: 82900860.0 (22) Date of filing: 29.01.1982

(51) International Patent Classification (IPC):  E21B 21/ 06( . ) F26B 3/ 22( . ) F26B 23/ 02( . ) E21B 41/ 00( . ) F26B 17/ 22( . ) (86) International application number: PCT/US1982/000131 (87) International publication number: WO 1983/002568 (04.08.1983 Gazette 1983/18)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (71) Applicant: SCHELLSTEDE, Herman J. New Iberia LA 70560 (US)	(72) Inventor: SCHELLSTEDE, Herman J. New Iberia LA 70560 (US) (74) Representative: Haigh, Charles Roy, et al  J.A. KEMP & CO. 14 South Square Gray's Inn London WC1R 5LX London WC1R 5LX (GB)