(19)

(11)

EP 0 705 459 A1

(12)

(43) Date of publication: 10.04.1996 Bulletin 1996/15 (21) Application number: 94919952.0 (22) Date of filing: 21.06.1994

(51) International Patent Classification (IPC):  G06F 7/ 50( . ) H03K 19/ 0948( . ) G06F 7/ 508( . ) (86) International application number: PCT/SE1994/000614 (87) International publication number: WO 1995/000900 (05.01.1995 Gazette 1995/02)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 22.06.1993 SE 19930002158 (71) Applicant: UNIVERSITET I LINKÖPING S-581 83 Linköping (SE)	(72) Inventor: YUAN, Jiren S-582 48 Linköping (SE) (74) Representative: Berglund, Erik Wilhelm  Forskarpatent i Linköping AB S-581 83 Linköping S-581 83 Linköping (SE)