(19)

(11)

EP 0 683 639 A1

(12)

(43) Date of publication: 29.11.1995 Bulletin 1995/48 (21) Application number: 94907955.0 (22) Date of filing: 08.02.1994

(51) International Patent Classification (IPC):  A47L 9/ 00( . ) (86) International application number: PCT/US1994/001190 (87) International publication number: WO 1994/017719 (18.08.1994 Gazette 1994/19)

(84) Designated Contracting States: DE FR GB IT SE (30) Priority: 09.02.1993 US 19930015100 (71) Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. Linthicum, MD 21090 (US)	(72) Inventors: SMITH, Dexter, G. Columbia, MD 21046 (US) NOWICKI, Christopher, P. Bowie, MD 21042 (US) ARNOLD, Michael, F. Westminster, MD 21158 (US) (74) Representative: Stone, Patrick  28 Edenside Drive Attleborough Norfolk NR17 2EL Attleborough Norfolk NR17 2EL (GB)