(19)

(11)

EP 1 091 934 A2

(12)

(88) Date of publication A3: 15.06.2000 (43) Date of publication: 18.04.2001 Bulletin 2001/16 (21) Application number: 99932068.2 (22) Date of filing: 29.06.1999

(51) International Patent Classification (IPC)7: C07C 323/25 (86) International application number: PCT/US9914/758 (87) International publication number: WO 0000/469 (06.01.2000 Gazette 2000/01)

(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: 29.06.1998 US 90997 P 21.08.1998 US 97363 P (71) Applicant: Parker Hughes Institute St. Paul, MN 55113 (US)	(72) Inventors: UCKUN, Fatih, M. White Bear Lake, MN 55110 (US) NARLA, Rama, K. St. Paul, MN 55113 (US) PERRY, David, A. Minneapolis, MN 55406 (US) (74) Representative: Nachshen, Neil Jacob et al D Young & Co21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)