(19)
(11)
EP 0 188 609 A1
(12)
(43)
Date of publication:
30.07.1986
Bulletin 1986/31
(21)
Application number:
85903960.0
(22)
Date of filing:
01.08.1985
(51)
International Patent Classification (IPC):
H04R
3/
00
( . )
H04R
17/
00
( . )
(86)
International application number:
PCT/US1985/001469
(87)
International publication number:
WO 1986/001362
(
27.02.1986
Gazette 1986/05)
(84)
Designated Contracting States:
AT BE CH DE FR GB LI NL SE
(30)
Priority:
03.08.1984
US 19840637649
(71)
Applicant:
MOTOROLA, INC.
Schaumburg, IL 60196 (US)
(72)
Inventor:
HALCHUCK, Timothy, William
Gardena, CA 90249 (US)
(54)
PIEZOELECTRIC LOUDSPEAKER HAVING A FEEDBACK TRANSDUCER