(19)

(11)

EP 0 921 784 A1

(12)

(43) Date of publication: 16.06.1999 Bulletin 1999/24 (21) Application number: 98914413.0 (22) Date of filing: 01.04.1998

(51) International Patent Classification (IPC):  A61K 8/ 96( . ) A61K 8/ 92( . ) A61Q 11/ 00( . ) A61K 8/ 34( . ) A61K 8/ 97( . ) (86) International application number: PCT/US1998/006470 (87) International publication number: WO 1998/044901 (15.10.1998 Gazette 1998/41)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 04.04.1997 US 19970825525 (71) Applicant: OPTIVA CORP. Bellevue, WA 98005 (US)	(72) Inventors: IYER, Lokanathan, M. Edmonds, WA 98026 (US) SCOTT, James, R. Bothell, WA 98021 (US) WHITFIELD, Douglas, F. Bothell, WA 98011 (US) (74) Representative: Spall, Christopher John, et al  BARKER BRETTELL 138 Hagley Road Edgbaston Birmingham B16 9PW Edgbaston Birmingham B16 9PW (GB)