(19)

(11)

EP 0 521 984 A1

(12)

(43) Date of publication: 13.01.1993 Bulletin 1993/02 (21) Application number: 91906929.0 (22) Date of filing: 26.03.1991

(51) International Patent Classification (IPC):  B63B 21/ 00( . ) E02B 3/ 24( . ) (86) International application number: PCT/SE1991/000232 (87) International publication number: WO 1991/014615 (03.10.1991 Gazette 1991/23)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 26.03.1990 SE 19900001079 (71) Applicant: NORENT AB S-400 32 Göteborg (SE)	(72) Inventor: APELSTRAND, Lennart S-421 54 Västra Frölunda (SE) (74) Representative: Roth, Ernst Adolf Michael  GÖTEBORGS PATENTBYRA AB Box 5005 S-402 21 Göteborg S-402 21 Göteborg (SE)