(19)

(11)

EP 1 319 297 A2

(12)

(88) Date of publication A3: 16.01.2003 (43) Date of publication: 18.06.2003 Bulletin 2003/25 (21) Application number: 01967491.0 (22) Date of filing: 17.09.2001

(51) International Patent Classification (IPC)7: H04L 29/06 (86) International application number: PCT/GB0104/140 (87) International publication number: WO 0202/5319 (28.03.2002 Gazette 2002/12)

(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 (30) Priority: 22.09.2000 US 668785 (71) Applicants: WEATHERFORD/LAMB, INC. HoustonTexas 77027 (US) Harding, Richard Patrick Oxford OX4 2RU (GB)	(72) Inventors: LONGBOTTOM, James Magnolia, TX 77353 (US) HAUGEN, David, Michael League City, TX 77573 (US) (74) Representative: Talbot-Ponsonby, Daniel  Marks & Clerk4220 Nash CourtOxford Business Park South Oxford OX4 2RU Oxford OX4 2RU (GB)