(19)

(11)

EP 0 191 837 A1

(12)

(43) Date of publication: 27.08.1986 Bulletin 1986/35 (21) Application number: 85904312.0 (22) Date of filing: 09.08.1985

(51) International Patent Classification (IPC):  B23K 26/ 36( . ) B28D 1/ 22( . ) (86) International application number: PCT/US1985/001496 (87) International publication number: WO 1986/001138 (27.02.1986 Gazette 1986/05)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 14.08.1984 US 19840640764 (71) Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY Cambridge, MA 02139 (US)	(72) Inventor: CHRYSSOLOURIS, George, M. Cambridge, MA 02139 (US) (74) Representative: Holdcroft, James Gerald, Dr., et al  Graham Watt & Co., Riverhead Sevenoaks, Kent TN13 2BN Sevenoaks, Kent TN13 2BN (GB)