(19)

(11)

EP 0 232 248 A1

(12)

(43) Date of publication: 19.08.1987 Bulletin 1987/34 (21) Application number: 85902783.0 (22) Date of filing: 13.05.1985

(51) International Patent Classification (IPC):  E02D 1/ 02( . ) G01B 7/ 16( . ) E21B 49/ 00( . ) (86) International application number: PCT/US1985/000863 (87) International publication number: WO 1986/006830 (20.11.1986 Gazette 1986/25)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (71) Applicant: UNIVERSITY OF ALABAMA University, AL 35486 (US)	(72) Inventors: PARK, Duk-Won Northport, AL 35476 (US) RYAN, Theodore, W. Moundville, AL 35474 (US)