(19)

(11)

EP 0 934 374 A2

(12)

(43) Date of publication: 11.08.1999 Bulletin 1999/32 (21) Application number: 97948127.0 (22) Date of filing: 28.10.1997

(51) International Patent Classification (IPC):  C10L 1/ 32( . ) (86) International application number: PCT/US1997/019368 (87) International publication number: WO 1998/018884 (07.05.1998 Gazette 1998/18)

(84) Designated Contracting States: FR GB (30) Priority: 28.10.1996 US 19960739509 (71) Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY Cambridge, MA 02139 (US)	(72) Inventors: YING, Jackie, Y. Winchester, MA 01890 (US) ZARUR, Andrey Somerville, MA 02143 (US) SUN, Tao Midland, MI 48640 (US) HEIBEL, Anne, T. Danville, CA 94526 (US) (74) Representative: Killin, Stephen James, et al  Venner, Shipley & Co., 20 Little Britain London EC1A 7DH London EC1A 7DH (GB)