(19)

(11)

EP 0 644 721 A1

(12)

(43) Date of publication: 29.03.1995 Bulletin 1995/13 (21) Application number: 93909662.0 (22) Date of filing: 11.05.1993

(51) International Patent Classification (IPC):  A23K 1/ 00( . ) A23K 1/ 18( . ) A23K 1/ 16( . ) (86) International application number: PCT/AU1993/000213 (87) International publication number: WO 1993/022936 (25.11.1993 Gazette 1993/28)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 11.05.1992 AU 19920002370 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Campbell, Australian Capital Territory 2601 (AU)	(72) Inventors: ASHES, John Richard Wahroonga, NSW 2076 (AU) SCOTT, Trevor William Kellyville, NSW 2153 (AU) (74) Representative: Beresford, Keith Denis Lewis, et al  BERESFORD & Co. 2-5 Warwick Court High Holborn London WC1R 5DJ London WC1R 5DJ (GB)