(19)

(11)

EP 0 534 976 A1

(12)

(43) Date of publication: 07.04.1993 Bulletin 1993/14 (21) Application number: 91904106.0 (22) Date of filing: 28.01.1991

(51) International Patent Classification (IPC):  G06F 1/ 16( . ) (86) International application number: PCT/US1991/000570 (87) International publication number: WO 1991/017493 (14.11.1991 Gazette 1991/26)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 04.05.1990 US 19900519031 (71) Applicant: GRID SYSTEMS CORPORATION Fremont California 94537-5003 (US)	(72) Inventors: HAWKINS, Jeffrey, C. Redwood City, CA 94062 (US) DALY, John, J. San Carlos, CA 94070 (US) (74) Representative: Beresford, Keith Denis Lewis, et al  BERESFORD & Co. 2-5 Warwick Court High Holborn London WC1R 5DJ London WC1R 5DJ (GB)