Patents-Review.com
ClassID:

201971 ⎘

H01G7/023 - CPC Classification

Classification description:

Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture; Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric of macromolecular compounds

Recent Application in this class:
#1
20260120959
2026-04-30

ELECTRETS FOR POWER ELECTRONIC APPLICATIONS

 #2
20250336613
2025-10-30

ELECTRET MATERIAL AND SKIN-PATCH TYPE ELECTRET ENERGY HARVESTING DEVICE USING SAME

 #3
20250256229
2025-08-14

ELECTRET AND ELECTRET FILTER

 #4
20220042225
2022-02-10

Fully degradable non-woven fabric produced by melt-blow extrusion and application thereof in production of medical masks

 #5
20210262134
2021-08-26

Methods of saturating nonwoven fabrics with liquid and the making of electret thereof

 #6
20210257165
2021-08-19

Electret sheet and piezoelectric sensor

 #7
20210249195
2021-08-12

Electret sheet

 #8
20200098525
2020-03-26

Electret energy storage system

 #9
20190311702
2019-10-10

Piezoelectric element and musical instrument

 #10
20190057816
2019-02-21

Electret sheet

 #11
20190043672
2019-02-07

Electret sheet

 #12
20170062138
2017-03-02

Electret sheet and piezoelectric sensor

 #13
20160102223
2016-04-14

Polymer electret and method of manufacturing the same

 #14
20140147777
2014-05-29

Fine electret particles and process for producing same

 #15
20140132111
2014-05-15

ELECTRET AND PROCESS FOR ITS PRODUCTION, AND ELECTROSTATIC INDUCTION-TYPE CONVERSION DEVICE

 #16
20130208397
2013-08-15

Capacitive transducer and a method for manufacturing a transducer

 #17
20130202810
2013-08-08

Process for producing charge retention medium

 #18
20130074320
2013-03-28

Method of incorporating an element in a data carrier

 #19
20130012091
2013-01-10

Electret materials

 #20
20120217842
2012-08-30

Electrostatic operation device

 #21
20120184170
2012-07-19

Electret Materials

 #22
20120177907
2012-07-12

Energy conversion film

 #23
20110263788
2011-10-27

Process for producing electret, and electrostatic induction conversion device

 #24
20110263785
2011-10-27

Process for producing electret, and electrostatic induction conversion device

 #25
20110230109
2011-09-22

Electret Materials

 #26
20110229655
2011-09-22

Process for production of electret material

 #27
20110198224
2011-08-18

Process for producing electret coarse powder

 #28
20110182323
2011-07-28

Detection device, sensor device, and electronic device

 #29
20110166299
2011-07-07

Electret and electrostatic induction conversion device

 #30
20110105686
2011-05-05

Electret and electrostatic induction conversion device

 #31
20110012438
2011-01-20

Electret and electrostatic induction conversion device

 #32
20100222533
2010-09-02

Method of producing an electret material

 #33
20100127595
2010-05-27

Electret and electrostatic induction conversion device comprising the same

 #34
20100112886
2010-05-06

Electret materials

 #35
20100019616
2010-01-28

ELECTROSTATIC OPERATION DEVICE

 #36
20090051242
2009-02-26

Electrostatic induction conversion device

 #37
20080249269
2008-10-09

Electret materials

 #38
20080002333
2008-01-03

Capacitive latched bi-stable molecular switch

 #39
20080002329
2008-01-03

High Dielectric, Non-Linear Capacitor

 #40
20070235903
2007-10-11

Electret materials

 #41
20060243138
2006-11-02

Electret article having high fluorosaturation ratio

 #42
20060113862
2006-06-01

Electrostatic induction conversion device

 #43
20050107555
2005-05-19

Electret and composite formed therewith