(19)

(11)

EP 1 407 262 A1

(12)

(43) Date of publication: 14.04.2004 Bulletin 2004/16 (21) Application number: 01935521.3 (22) Date of filing: 15.05.2001

(51) International Patent Classification (IPC)7: G01N 33/24, G01N 3/08 (86) International application number: PCT/US2001/015638 (87) International publication number: WO 2001/088529 (22.11.2001 Gazette 2001/47)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (71) Applicant: Earthwork Solutions, Inc. Houston,Texas 77079 (US)	(72) Inventors: Tritico, Philip A. Houston, Texas 77079 (US) Langston, Ron E. Houston, Texas 77079 (US) (74) Representative: Ebner von Eschenbach, Jennifer et al Ladas & Parry,Dachauerstrasse 37 80335 München 80335 München (DE)