(19)

(11)

EP 0 932 721 A1

(12)

(43) Date of publication: 04.08.1999 Bulletin 1999/31 (21) Application number: 98938547.0 (22) Date of filing: 21.08.1998

(51) International Patent Classification (IPC):  D06L 3/ 02( . ) D06L 3/ 16( . ) D06M 11/ 54( . ) D06M 15/ 643( . ) D06L 3/ 10( . ) D06M 11/ 50( . ) D06M 13/ 165( . ) (86) International application number: PCT/AU1998/000669 (87) International publication number: WO 1999/010588 (04.03.1999 Gazette 1999/09)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: LV (30) Priority: 21.08.1997 AU 1997PO08702 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Campbell, ACT 2612 (AU)	(72) Inventors: GUISE, Bruce Newtown, VIC 3220 (AU) DENNING, Ron Highton, VIC 3216 (AU) FREELAND, Graeme Highton, VIC 3216 (AU) (74) Representative: Andrae, Steffen, Dr., et al  Andrae Flach Haug Balanstrasse 55 81541 München 81541 München (DE)