(19)

(11)

EP 0 469 003 A1

(12)

(43) Date of publication: 05.02.1992 Bulletin 1992/06 (21) Application number: 90906060.0 (22) Date of filing: 18.04.1990

(51) International Patent Classification (IPC):  H02J 1/ 14( . ) H03K 17/ 10( . ) H03K 17/ 64( . ) H03K 17/ 08( . ) H03K 17/ 12( . ) H03K 17/ 66( . ) (86) International application number: PCT/AU1990/000152 (87) International publication number: WO 1990/013177 (01.11.1990 Gazette 1990/25)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 18.04.1989 AU 19890003751 (71) Applicant: BORAL JOHNS PERRY INDUSTRIES PTY. LTD. Cheltenham, VIC 3192 (AU)	(72) Inventor: ECKERSLEY, Gregory, P. Cheltenham, VIC 3192 (AU) (74) Representative: Spall, Christopher John, et al  BARKER, BRETTELL & DUNCAN 138 Hagley Road Edgbaston Birmingham B16 9PW Edgbaston Birmingham B16 9PW (GB)