ELECTRONIC CANCELLATION OF D.C. MOTOR NOISE - Patent 0631685

(19)

(11)

EP 0 631 685 A1

(12)

(43)	Date of publication:
	04.01.1995 Bulletin 1995/01

(21)	Application number: 92915176.0

(22)	Date of filing: 19.03.1992

(51)

International Patent Classification (IPC):

B60L 9/ 02^{( . )}
G10K 11/ 178^{( . )}
H02K 11/ 00^{( . )}
H02P 7/ 298^{( . )}

G10K 11/ 16^{( . )}
H02K 5/ 24^{( . )}
H02K 23/ 66^{( . )}

(86)	International application number:
	PCT/US1992/002073

(87)	International publication number:
	WO 1993/019458 (30.09.1993 Gazette 1993/24)

(84)	Designated Contracting States:
	AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE

(71)	Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.
	Linthicum, MD 21090 (US)

(72)	Inventors:
	SMITH, Dexter Columbia, MD 21046 (US) SCHWARTZ, Joseph Ellicott City, MD 21403 (US) ZIEGLER, Eldon, W., Jr. Columbia, MD 21046 (US)

(74)	Representative: Wilhelm & Dauster Patentanwälte European Patent Attorneys
	Hospitalstrasse 8 D-70174 Stuttgart D-70174 Stuttgart (DE)

(54)	ELECTRONIC CANCELLATION OF D.C. MOTOR NOISE