(19)

(11)

EP 0 578 809 A1

(12)

(43) Date of publication: 19.01.1994 Bulletin 1994/03 (21) Application number: 93904401.0 (22) Date of filing: 01.02.1993

(51) International Patent Classification (IPC):  E04G 21/ 16( . ) (86) International application number: PCT/NL1993/000030 (87) International publication number: WO 1993/015290 (05.08.1993 Gazette 1993/19)

(84) Designated Contracting States: BE DE FR GB LU NL (30) Priority: 30.01.1992 BE 19920000095 (71) Applicant: YTONG NEDERLAND B.V. NL-4214 LC Vuren (NL)	(72) Inventor: VAN VEEN, Jan NL-3371 RJ Hardinxveld Giessendam (NL) (74) Representative: Konings, Lucien Marie Cornelis Joseph  Arnold & Siedsma, Advocaten en Octrooigemachtigden, Sweelinckplein 1 NL-2517 GK Den Haag NL-2517 GK Den Haag (NL)