(19)

(11)

EP 0 929 797 A1

(12)

(43) Date of publication: 21.07.1999 Bulletin 1999/29 (21) Application number: 97903005.0 (22) Date of filing: 16.01.1997

(51) International Patent Classification (IPC):  G01F 1/ 84( . ) (86) International application number: PCT/US1997/000837 (87) International publication number: WO 1998/031990 (23.07.1998 Gazette 1998/29)

(84) Designated Contracting States: BE DE FR GB IT NL (71) Applicant: DIRECT MEASUREMENT CORP. Longmont, CO 80504-9631 (US)	(72) Inventors: CAGE, Donald, R. Longmont, CO 80501 (US) HAHN, David, T. Longmont, CO 80503 (US) SCHOTT, Michael, N. Loveland, CO 80538 (US) CARMICHAEL, Larry, K. Westminster, CO 80021 (US) (74) Representative: Howick, Nicholas Keith  CARPMAELS & RANSFORD 43 Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)