(19)

(11)

EP 0 073 190 A1

(12)

(43) Date of publication: 09.03.1983 Bulletin 1983/10 (21) Application number: 81901612.0 (22) Date of filing: 02.03.1981

(51) International Patent Classification (IPC):  H05B 3/ 12( . ) H05B 6/ 10( . ) (86) International application number: PCT/US1981/000278 (87) International publication number: WO 1982/003148 (16.09.1982 Gazette 1982/22)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (71) Applicant: IRIS ASSOCIATES Palo Alto, CA 94303 (US)	(72) Inventors: CARTER, Philip S. Palo Alto, CA 94303 (US) KRUMME, John F. Woodside, CA 94062 (US) (74) Representative: Hayward, Denis Edward Peter, et al  Lloyd Wise, Tregear & Co. Norman House 105-109 Strand London WC2R 0AE London WC2R 0AE (GB)