(19)

(11)

EP 1 250 759 A1

(12)

(43) Date of publication: 23.10.2002 Bulletin 2002/43 (21) Application number: 00986432.3 (22) Date of filing: 15.12.2000

(51) International Patent Classification (IPC)7: H03K 5/00 (86) International application number: PCT/US0034/077 (87) International publication number: WO 0105/6157 (02.08.2001 Gazette 2001/31)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 26.01.2000 US 491998 (71) Applicant: Acoustic Technologies, Inc. Mesa, AZ 85204 (US)	(72) Inventor: THOMASSON, Samuel, L. Gilbert, AZ 85234 (US) (74) Representative: Dealtry, Brian  Eric Potter Clarkson,Park View House,58 The Ropewalk Nottingham NG1 5DD Nottingham NG1 5DD (GB)