(19)

(11)

EP 0 153 921 A1

(12)

(43) Date of publication: 11.09.1985 Bulletin 1985/37 (21) Application number: 83903035.0 (22) Date of filing: 29.08.1983

(51) International Patent Classification (IPC):  H01L 31/ 04( . ) H01L 31/ 20( . ) H01L 31/ 032( . ) (86) International application number: PCT/US1983/001317 (87) International publication number: WO 1985/001153 (14.03.1985 Gazette 1985/07)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (71) Applicant: COLUMBIA CHASE CORPORATION Braintree, MA 02184 (US)	(72) Inventor: GROLITZER, Kathy Barnet Tarzana, CA 91356 (US) (74) Representative: Warren, Keith Stanley, et al  BARON & WARREN 18 South End Kensington London W8 5BU London W8 5BU (GB)