H04R2209/021 - CPC Classification Index

ClassID:

232135 ⎘

H04R2209/021 - CPC Classification

Classification description:

Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by but not provided for in any of its subgroups Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer

Recent Application in this class:

20240406637

2024-12-05

ELECTROACOUSTIC TRANSDUCER

20230117602

2023-04-20

IMPROVEMENTS IN AND RELATING TO LOUDSPEAKER MAGNET ASSEMBLIES

20190230443

2019-07-25

Electric motor

20190182598

2019-06-13

Electric motor

20180343523

2018-11-29

Speaker device, and method for improving sound quality of speaker device

20180070182

2018-03-08

Electric motor

20170041714

2017-02-09

Transducer

20160142841

2016-05-19

Electroacoustic conversion chain with selectively powered coil

20150036844

2015-02-05

Apparatus in an acoustic assembly for registering assembly parts

#10

20150010198

2015-01-08

Acoustic transducer

#11

20140238737

2014-08-28

Reducing inductive heating

#12

20140169615

2014-06-19

Electromagnetic drive unit

#13

20140119579

2014-05-01

Electromechanical-electroacoustic transducer with low thickness and high travel range and relevant manufacturing method

#14

20130163806

2013-06-27

Driver assembly for loudspeakers

#15

20110007913

2011-01-13

MAGNET ASSEMBLY FOR A LOUDSPEAKER

#16

20090028375

2009-01-29

Electrodynamic transducer and use thereof in loudspeakers and geophones

#17

20070098208

2007-05-03

Low-inductance electromagnetic drive without driving the magnetic flux circuit

#18

20050190945

2005-09-01

Shorting ring fixture for electromagnetic transducer