(19)

(11)

EP 1 177 417 A1

(12)

(43) Date of publication: 06.02.2002 Bulletin 2002/06 (21) Application number: 00905654.0 (22) Date of filing: 19.01.2000

(51) International Patent Classification (IPC)7: G01F 23/00 (86) International application number: PCT/US0001/212 (87) International publication number: WO 0042/395 (20.07.2000 Gazette 2000/29)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 19.01.1999 US 116302 P (71) Applicant: ROCKY MOUNTAIN RESEARCH INC. Salt Lake City, UT 84103 (US)	(72) Inventors: DRAPER, R., Bruce Sandy, UT 84092 (US) GRIFFITHS, Robert, W. Salt Lake City, UT (US) (74) Representative: Evens, Paul Jonathan et al Maguire Boss, 5 Crown Street St. Ives, Cambridge PE27 5EB St. Ives, Cambridge PE27 5EB (GB)