(19)

(11)

EP 0 357 657 A1

(12)

(43) Date of publication: 14.03.1990 Bulletin 1990/11 (21) Application number: 88903881.0 (22) Date of filing: 28.04.1988

(51) International Patent Classification (IPC):  H01B 12/ 12( . ) H01L 39/ 24( . ) H01B 13/ 00( . ) (86) International application number: PCT/GB1988/000330 (87) International publication number: WO 1988/008618 (03.11.1988 Gazette 1988/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 29.04.1987 GB 19870010113 (71) Applicants: EVETTS, Jan Edgar Cambridge (GB) GLOWACKI, Bartlomiej Andrzej Cambridge CB1 3AP (GB)	(72) Inventors: EVETTS, Jan Edgar Cambridge (GB) GLOWACKI, Bartlomiej Andrzej Cambridge CB1 3AP (GB) (74) Representative: Nash, Keith Wilfrid  KEITH W. NASH & Co. Pearl Assurance House 90-92 Regent Street Cambridge CB2 1DP Cambridge CB2 1DP (GB)