(19)

(11)

EP 0 682 738 A1

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(43) Date of publication: 22.11.1995 Bulletin 1995/47 (21) Application number: 92911558.0 (22) Date of filing: 29.05.1992

(51) International Patent Classification (IPC):  E21B 10/ 02( . ) E21B 10/ 60( . ) E21B 17/ 18( . ) E21B 10/ 38( . ) E21B 17/ 046( . ) E21B 21/ 12( . ) (86) International application number: PCT/DK1992/000172 (87) International publication number: WO 1992/021849 (10.12.1992 Gazette 1992/31)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 30.05.1991 DK 19910001028 (71) Applicant: VON BENZON, Ernst Benzoni DK-3320 Skaevinge (DK)	(72) Inventor: VON BENZON, Ernst Benzoni DK-3320 Skaevinge (DK) (74) Representative: Schoenning, Soeren, et al  Internationalt Patent-Bureau Kontor for Industriel Eneret, Hoeje Taastrup Boulevard 23 DK-2630 Taastrup DK-2630 Taastrup (DK)