(19)

(11)

EP 0 497 791 A1

(12)

(43) Date of publication: 12.08.1992 Bulletin 1992/33 (21) Application number: 90915011.0 (22) Date of filing: 11.09.1990

(51) International Patent Classification (IPC):  G01B 7/ 00( . ) G01C 9/ 06( . ) G01B 7/ 30( . ) G01C 9/ 20( . ) (86) International application number: PCT/US1990/005124 (87) International publication number: WO 1991/005985 (02.05.1991 Gazette 1991/10)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 17.10.1989 US 19890422515 (71) Applicant: WEDGE INNOVATIONS, INC. San Jose, CA 95131 (US)	(72) Inventors: NAGLE, Robert, E. Mountain View, CA 94040 (US) BUTLER, Andrew, G. Palo Alto, CA 94301 (US) (74) Representative: Harrison, David Christopher, et al  MEWBURN ELLIS York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)