H04R21/02 - CPC Classification Index

ClassID:

232040 ⎘

H04R21/02 - CPC Classification

Classification description:

Variable-resistance transducers Microphones

Sub-classes:

H04R21/021 » {with granular resistance material} 0
H04R21/023 » {with more than one granular chamber} 0
H04R21/025 » {disposition of the granular chamber in microphones} 0
H04R21/026 » {in which the sound is perpendicular to the current crossing the transducer material} 0
H04R21/028 » {with a fluid as resistance material} 2

Recent Application in this class:

20190086481

2019-03-21

Sensor having deformable film portion and magnetic portion and electronic device

20180132023

2018-05-10

MICROPHONE AND MANUFACTURING METHOD THEREOF

20180058629

2018-03-01

Speaker mount and assembly and method of disengagement thereof

20180054673

2018-02-22

Unidirectional condenser microphone unit

20160337753

2016-11-17

Condenser microphone

20160127821

2016-05-05

Acoustic system having a housing with adsorbent powder

20160088389

2016-03-24

Microphone system with non-orthogonally mounted microphone die

20150373444

2015-12-24

Microphone

20140205127

2014-07-24

Microphone system with non-orthogonally mounted microphone die

#10

20140000378

2014-01-02

Differential pressure sensor

#11

20130322675

2013-12-05

Sensor module

#12

20120175747

2012-07-12

MEMS device assembly and method of packaging same

#13

20120027236

2012-02-02

Acoustic pressure transducer

#14

20110249853

2011-10-13

Acoustic energy transducer

#15

20110176698

2011-07-21

Differential microphone

#16

20090136073

2009-05-28

Microphone

#17

20070195983

2007-08-23

Combination wind screen and microphone shock mount

#18

20050249041

2005-11-10

Miniature acoustic detector based on electron surface tunneling

#19

16514593

2023-10-24

Variable voltage phantom power supply assembly and a method for customizing performance characteristics of a microphone