ClassID:

213513

H01M8/04671 - CPC Classification

Classification description:

Fuel cells; Manufacture thereof; Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids; Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function; Failure or abnormal function of the individual fuel cell

Recent Application in this class:
#1
20260149017
2026-05-28

METHOD OF DIAGNOSING LEAKAGE OF STACK COOLANT AND DEVICE THEREFOR

#2
20260112672
2026-04-23

FUEL CELL SYSTEM

#3
20260106194
2026-04-16

FUEL CELL DURABILITY OPTIMIZATION

#4
20260091349
2026-04-02

METHOD OF PRODUCING A NITROGEN ENRICHED STREAM FROM AN ELECTROCHEMICAL SYSTEM

#5
20260038857
2026-02-05

SYSTEMS AND METHODS FOR MULTI-INPUT ANODE LOOP CONTROL FOR FUEL CELLS

#6
20250379245
2025-12-11

SYSTEMS AND METHODS FOR PARTIAL DERIVATIVE 3-WAY VALVE CONTROL

#7
20250316730
2025-10-09

RUN FUEL CELL COOLANT THROUGH CATHODE INTERCOOLER

#8
20250309298
2025-10-02

FUEL CELL APPARATUS

#9
20250309297
2025-10-02

FUEL CELL SYSTEM, VEHICLE, AND METHOD OF MEASURING IMPEDANCE

#10
20250286091
2025-09-11

ANALYSIS METHOD, ANALYSIS DEVICE, AND POWER GENERATION SYSTEM

#11
20250233185
2025-07-17

PRODUCTION METHOD AND PRODUCTION SYSTEM FOR PRODUCING A FUEL CELL STACK

#12
20250233175
2025-07-17

METHOD FOR MONITORING AN ELECTROCHEMICAL SYSTEM, AND AN ELECTROCHEMICAL SYSTEM

#13
20250183337
2025-06-05

SYSTEMS AND METHODS FOR DETERMINING SEQUENTIAL PRESSURE REGRESSION IN FUEL CELLS

#14
20250170534
2025-05-29

HUMIDIFICATION SYSTEM AND METHOD FOR A PROCESS GAS

#15
20250087733
2025-03-13

METHOD AND SYSTEM FOR ACCELERATED LIFE TESTING (ALT) OF PROTON EXCHANGE MEMBRANE FUEL CELLS (PEMFCs)

#16
20250046839
2025-02-06

APPARATUS AND METHOD FOR DETECTING OR CONTROLLING CARBON BUILDUP IN A DIRECT CARBON FUEL CELL

#17
20250030020
2025-01-23

DIAGNOSIS SYSTEMS AND METHODS FOR FUEL CELL ASSEMBLIES

#18
20250015323
2025-01-09

Fuel cell fault diagnosis method and system

#19
20240418594
2024-12-19

ACTIVE LEAKAGE DETECTION

#20
20240396066
2024-11-28

Device for Converting Voltage

#21
20240387843
2024-11-21

ION ANALYSIS DEVICE AND FUEL CELL EVALUATION SYSTEM

#22
20240379978
2024-11-14

Method and Device for Detecting an Impaired Fuel Cell

#23
20240297317
2024-09-05

METHOD AND APPARATUS OF DETECTING PROTON EXCHANGE MEMBRANE FUEL CELL OPERATING STATE

#24
20240291007
2024-08-29

METHOD FOR DIAGNOSING A FUEL CELL SYSTEM, SYSTEM CONTROL DEVICE FOR IMPLEMENTING SUCH A METHOD, AND FUEL CELL SYSTEM INCLUDING SUCH A SYSTEM CONTROL DEVICE

#25
20240234780
2024-07-11

STACK CARTRIDGE ASSEMBLY

#26
20240222664
2024-07-04

FUEL CELL FLUSHING SYSTEM AND METHOD THEREFOR

#27
20240204224
2024-06-20

FUEL CELL VEHICLE

#28
20240149749
2024-05-09

SYSTEM AND METHOD FOR CONTROLLING A FUEL CELL ENERGY SYSTEM OF A VEHICLE

#29
20240113315
2024-04-04

PERFORMANCE TESTING DEVICE APPLICABLE TO METAL FUEL CELL

#30
20240085365
2024-03-14

SENSORS

#31
20240055633
2024-02-15

METHOD FOR DETERMINING THE LENGTH AND/OR VOLUME OF THE PURGE PATH WITHIN A FUEL CELL SYSTEM

#32
20240030469
2024-01-25

ANODE POISON REDUCTION SYSTEM AND METHOD FOR FUEL CELL VEHICLE

#33
20230411657
2023-12-21

METHOD FOR CONTROLLING POWER GENERATION SYSTEM, CONTROL APPARATUS, AND POWER GENERATION SYSTEM

#34
20230411655
2023-12-21

METHODS AND APPARATUS FOR END-OF-LINE TESTING OF FUEL CELL STACKS AND ELECTROLYZERS

#35
20230402659
2023-12-14

BATTERY CONTROL SYSTEM AND METHOD OF FUEL CELL VEHICLE

#36
20230378497
2023-11-23

Hydrogen Supply System for Fuel Cell and Inspection Method Thereof

#37
20230369616
2023-11-16

Detecting a fault condition in a fuel cell system

#38
20230311714
2023-10-05

FUEL CELL SYSTEM

#39
20230302911
2023-09-28

VEHICLE CONTROL APPARATUS FOR CONTROLLING FUEL CELL SYSTEM AND CONTROL METHOD THEREOF

#40
20230268542
2023-08-24

FUEL CELL STACK, FUEL CELL DEVICE AND MOTOR VEHICLE WITH FUEL CELL DEVICE

#41
20230268530
2023-08-24

System and method for fuel cell diagnosis

#42
20230261225
2023-08-17

Apparatus for Converting Power of Fuel Cell for Power Generation and Method Thereof

#43
20230178771
2023-06-08

Apparatus and method for power supply using cooperation of fuel cell and energy storage

#44
20230139052
2023-05-04

Coordination chemistry flow battery electrolyte ground fault detection

#45
20230125311
2023-04-27

METHOD AND DEVICE FOR CONTROLLING DETERIORATION AVOIDANCE OPERATION OF FUEL CELL SYSTEM

#46
20230105961
2023-04-06

System and method for controlling operation of fuel cell system

#47
20230095277
2023-03-30

Fuel cell system without high pressure line of hydrogen supplying system and control method thereof

#48
20230077313
2023-03-09

METHOD OF ANALYZING A FUNCTIONAL LAYER OF AN ELECTROCHEMICAL CELL OR AN ELECTROCHEMICAL SENSOR APPLICATION

#49
20230037634
2023-02-09

METHOD FOR DIAGNOSING DETERIORATION OF FUEL CELL AND METHOD AND SYSTEM FOR PREVENTING DETERIORATION OF FUEL CELL USING THE SAME

#50
20220416264
2022-12-29

METHOD OF MONITORING AND REPLACING FUEL CELL STACKS WITHIN A FUEL CELL STACK ASSEMBLY

#51
20220384835
2022-12-01

Fuel Cell Array and Fuel Cell Inspection Method

#52
20220376283
2022-11-24

Control method for fuel cell system

#53
20220285711
2022-09-08

Fuel cell system

#54
20220223892
2022-07-14

FUEL CELL SYSTEM

#55
20220221500
2022-07-14

Insulation resistance detecting apparatus, system having the same, and method thereof

#56
20220181658
2022-06-09

Fuel battery cell, fuel battery system, leak detection method

#57
20220109169
2022-04-07

Fuel cell system and method of controlling fuel cell system

#58
20210408565
2021-12-30

Method of inspecting short circuit of electrolyte membrane and apparatus for inspecting short circuit of electrolyte membrane

#59
20210384531
2021-12-09

Power supply control system, power supply control method, and storage medium

#60
20210359318
2021-11-18

Fuel cell system

#61
20210305615
2021-09-30

Fuel cell stack, method for producing a fuel cell stack and method for operating a fuel cell stack

#62
20210257634
2021-08-19

Method of detecting degradation of membrane electrode assembly in fuel cell system

#63
20210226237
2021-07-22

Fuel cell system

#64
20210202975
2021-07-01

Fuel cell device and systems enabling cell-level repair

#65
20210135261
2021-05-06

Fuel cell system

#66
20210135259
2021-05-06

Deterioration estimation system for fuel cell, hydrogen supply system for fuel cell including same, and hydrogen supply method for fuel cell

#67
20210078438
2021-03-18

Information processing system

#68
20210072172
2021-03-11

Inspection system and inspection method of member for fuel cell separator

#69
20210063493
2021-03-04

METHOD AND APPARATUS FOR MONITORING A FUEL CELL

#70
20210013530
2021-01-14

Method of predicting life of membrane electrode assembly of fuel cell for electric power generation

#71
20200403257
2020-12-24

Fuel cell system

#72
20200403256
2020-12-24

Fuel cell system

#73
20200365921
2020-11-19

Control system and control method for driving of fuel cell

#74
20200303751
2020-09-24

Water discharge control system and method for fuel cell

#75
20200212464
2020-07-02

Fuel cell system, equipment management method, management apparatus, and equipment management system

#76
20200136162
2020-04-30

Redox flow battery system and method for operating redox flow battery system

#77
20200099069
2020-03-26

Fuel cell system

#78
20200067119
2020-02-27

Fuel cell system

#79
20200067113
2020-02-27

Fuel gas supply system

#80
20200064406
2020-02-27

METHOD FOR DIAGNOSING A TECHNICAL SYSTEM

#81
20200023727
2020-01-23

Vehicle emergency battery switch

#82
20190393524
2019-12-26

Fuel cell system for modulating offset of hydrogen pressure sensor and method for modulating offset of hydrogen pressure sensor

#83
20190237782
2019-08-01

Redox flow battery

#84
20190214664
2019-07-11

Cell reversal diagnostics for a fuel cell stack

#85
20190207230
2019-07-04

Temperature control system and method for fuel cell system and fuel cell system

#86
20190165392
2019-05-30

Fuel cell system

#87
20190157693
2019-05-23

Diagnostic system, fuel cell system having a diagnostic system, and method for determining cathode gas contamination

#88
20190140293
2019-05-09

Fuel cell module arrangement with leak recovery and methods of use

#89
20190115606
2019-04-18

Pinhole determination method and system for fuel cell

#90
20190081338
2019-03-14

Fuel cell system and abnormality diagnosis method for fuel cell system

#91
20190056381
2019-02-21

Self-regulating alcohol breathalyzer

#92
20190051917
2019-02-14

Control device for fuel cell system

#93
20190049522
2019-02-14

Method for determining critical operating states in a fuel cell stack

#94
20190049521
2019-02-14

Method for determining critical operating states in a fuel cell stack

#95
20190013536
2019-01-10

Fuel cell system and method for controlling fuel cell system

#96
20190013533
2019-01-10

Isolation of a fuel cell

#97
20180316025
2018-11-01

Jig module for solid oxide fuel cell

#98
20180277866
2018-09-27

Method for repairing a fuel cell stack

#99
20180205101
2018-07-19

Fuel cell system without high pressure line of hydrogen supplying system and control method thereof

#100
20180183085
2018-06-28

Electrical power distribution system and method for a grid-tied reversible solid oxide fuel cell system

#101
20180166717
2018-06-14

Method and apparatus for estimating hydrogen crossover loss of fuel cell system

#102
20180148851
2018-05-31

System and method for tuning an electrochemical cell stack

#103
20180148850
2018-05-31

System and method for tuning an electrochemical cell stack

#104
20180138530
2018-05-17

Circuit and method for cell voltage sensing in fuel cell stack

#105
20180079309
2018-03-22

Apparatus for detecting gas leakage of a vehicle equipped with a fuel cell system

#106
20180067013
2018-03-08

Device and method for testing airtightness of fuel cell stack

#107
20180048006
2018-02-15

Fuel cell internal state detection system and state detection method

#108
20180026286
2018-01-25

Fuel cell system having improved timing control and vehicle utilizing the same

#109
20170362724
2017-12-21

Elementary unit for reactor performing water electrolysis or co-electrolysis (SOEC) or fuel cell (SOFC) operating under pressure

#110
20170346117
2017-11-30

Fuel cell system and method of shutting down the same

#111
20170331130
2017-11-16

Method for controlling fuel cell vehicle

#112
20170317366
2017-11-02

Pinhole determination method and system for fuel cell

#113
20170222237
2017-08-03

Odorant for Fuel Gases for Anion Membrane Fuel Cells, Fuel Gas and Power Generation System Using Anion Membrane Fuel Cell

#114
20170125830
2017-05-04

Fuel cell stack diagnostic system and diagnostic method thereof

#115
20170059663
2017-03-02

Diagnostic device

#116
20170005357
2017-01-05

Electrical power distribution system and method for a grid-tied reversible solid oxide fuel cell system

#117
20170003239
2017-01-05

Apparatus for measuring micro-cracks in a membrane electrode assembly and method for predicting generation of micro-cracks in the same

#118
20160380294
2016-12-29

Fuel cell system and emergency stop method

#119
20160372767
2016-12-22

Shutdown method of fuel cell stack and fuel cell system therefor

#120
20160301090
2016-10-13

FUEL CELL SYSTEM AND CONTROL METHOD

#121
20160276684
2016-09-22

Fuel cell and abnormality determination method

#122
20160211109
2016-07-21

Sample holder and charged particle device

#123
20160197366
2016-07-07

Systems and methods for detecting leaks in a fuel cell system

#124
20160141689
2016-05-19

Fuel cell system and fuel cell control method

#125
20160141678
2016-05-19

Fuel cell system and a method of detecting a hydrogen gas leak

#126
20160141677
2016-05-19

Method of detecting leakage of reactive gas of fuel cell and fuel cell system

#127
20160141634
2016-05-19

SEPARATOR FOR FUEL CELL

#128
20160133968
2016-05-12

Fuel cell unit

#129
20160126574
2016-05-05

Fuel cell system and maximum power calculation method

#130
20160116541
2016-04-28

Fuel cell inspection method and manufacturing method

#131
20160013500
2016-01-14

Method and apparatus for detecting defects of fuel cell membrane-electrode assembly

#132
20150357661
2015-12-10

Method for detecting leakage of a reducing fluid throughout an electrolyte membrane of an electrochemical cell

#133
20150357660
2015-12-10

PINHOLE DETECTION SYSTEM OF FUEL CELL

#134
20150325874
2015-11-12

Redox flow battery system and method of controlling it

#135
20150325871
2015-11-12

Procedure for detecting the state of permeability of the ion exchange polymer membrane of a fuel cell

#136
20150278704
2015-10-01

Method for optimization of fuel cells operating conditions using hybrid model

#137
20150270563
2015-09-24

Apparatus and method for controlling fuel cell system using reconfigurable switch network

#138
20150244013
2015-08-27

Control device of fuel cell, fuel cell system and control method of fuel cell

#139
20150162630
2015-06-11

Multi-point fuel cell voltage monitor

#140
20150153418
2015-06-04

Method for determining critical operating states in a fuel cell stack

#141
20150134277
2015-05-14

Method for checking the gas tightness of a fuel cell system

#142
20150099203
2015-04-09

Electronic equipment provided with battery check device

#143
20150086892
2015-03-26

Battery comprising a plurality of elecrochemical cells and, for each cell, a device for controlling the voltage across the terminals of said cell

#144
20150086890
2015-03-26

Fuel cell system

#145
20150037677
2015-02-05

Positive electrode active substance particles for non-aqueous electrolyte secondary batteries and process for producing the same, and non-aqueous electrolyte secondary battery

#146
20150024298
2015-01-22

System and method for tuning an electrochemical cell stack

#147
20140162160
2014-06-12

Fuel cell failure prediction apparatus

#148
20140162158
2014-06-12

Fuel cell bypass diode structures and attachment methods

#149
20140132238
2014-05-15

System and method for sensing and mitigating hydrogen evolution within a flow battery system

#150
20140119499
2014-05-01

Pinhole detection system of fuel cell

#151
20140057191
2014-02-27

Fuel cell system and method of detecting abnormality of fuel cell system

#152
20140023944
2014-01-23

FUEL CELL SYSTEM AND METHOD OF OPERATING SAME

#153
20140017579
2014-01-16

Electrolyte sheet for solid oxide fuel cell, unit cell for solid oxide fuel cell and solid oxide fuel cell equipped with same, method for testing electrolyte sheet for solid oxide fuel cell, and method for manufacturing electrolyte sheet for solid oxide fuel cell

#154
20130230072
2013-09-05

Flaw detection method and apparatus for fuel cell components

#155
20130164645
2013-06-27

Fuel cell system

#156
20130164640
2013-06-27

Operation method of polymer electrolyte fuel cell system and polymer electrolyte fuel cell system

#157
20130095405
2013-04-18

Fuel cell system and control method therefor

#158
20130093456
2013-04-18

Testing device for solid oxide fuel cell

#159
20130071765
2013-03-21

Method for Operating a Fuel Cell System

#160
20130004871
2013-01-03

Method of providing a calibrating reference voltage and index synchronization sequence for a cell voltage measurement system

#161
20130002232
2013-01-03

Frame sequence for a cell voltage measurement system with a low probability of natural occurrence

#162
20120321976
2012-12-20

Controlling fuel cell

#163
20120321916
2012-12-20

System and method for sensing and mitigating hydrogen evolution within a flow battery system

#164
20120315509
2012-12-13

Fuel cell bypass diode structures and attachment methods

#165
20120308906
2012-12-06

Fuel cell and method for stopping a fuel cell

#166
20120225366
2012-09-06

Identifying fuel cell defects

#167
20120191385
2012-07-26

METHOD FOR DETERMINING DETERIORATION OF FUEL CELL

#168
20120182005
2012-07-19

Voltage control device for a fuel cell

#169
20120162842
2012-06-28

Shunt system for cells in a fuel cell stack

#170
20120115059
2012-05-10

ELECTRICITY OUTPUT MANAGING SYSTEM FOR A FUEL CELL STACK

#171
20120043820
2012-02-23

FUEL CELL SYSTEM HAVING BYPASS CIRCUIT AND METHOD OF DRIVING THE SAME

#172
20120015267
2012-01-19

FUEL CELL SYSTEM, CONTROL METHOD FOR THE FUEL CELL SYSTEM, AND ELECTRIC VEHICLE EQUIPPED WITH THE FUEL CELL SYSTEM

#173
20110250517
2011-10-13

GASEOUS FUEL SUPPLY SYSTEM FOR A FUEL CELL

#174
20110200902
2011-08-18

FUEL CELL SYSTEM AND FUEL CELL STATE DETECTION METHOD

#175
20110178743
2011-07-21

Early detection of minimum cell voltage degradation of a fuel cell stack

#176
20110178742
2011-07-21

Detection method for membrane and electrode failures in fuel cell stacks

#177
20110171549
2011-07-14

Fuel cell system and method of detecting abnormality of fuel cell system

#178
20110168222
2011-07-14

AMTEC with heat pipe

#179
20110151347
2011-06-23

Fuel cell system and fuel cell status detection method

#180
20110129750
2011-06-02

DIRECT METHANOL FUEL CELL AND ELECTRONIC DEVICE

#181
20110129749
2011-06-02

Multi-point fuel cell voltage monitor

#182
20110122991
2011-05-26

PINHOLE DETECTION SYSTEM OF FUEL CELL

#183
20110115491
2011-05-19

Method for detecting ice blocking of fuel cell stack and controlling fuel cell vehicle using the same

#184
20110091783
2011-04-21

Electronic equipment provided with battery check device

#185
20110081587
2011-04-07

Apparatus for Detecting Leak in Fuel Cells

#186
20110027679
2011-02-03

Fuel cell system

#187
20110014535
2011-01-20

Method to improve reliability of a fuel cell system using low performance cell detection at low power operation

#188
20110003219
2011-01-06

SOLID OXIDE FUEL CELL INCLUDING BYPASS CIRCUIT

#189
20100264930
2010-10-21

Fuel cell system

#190
20100261083
2010-10-14

Power supply apparatus

#191
20100248060
2010-09-30

Fuel cell system and hydrogen leak judgment method in the system

#192
20100221837
2010-09-02

METHOD FOR EXAMINING ION-CONDUCTIVE ELECTROLYTE MEMBRANE

#193
20100209794
2010-08-19

Fuel cell system

#194
20100176876
2010-07-15

Fuel cell system

#195
20100143813
2010-06-10

Freeze start operation in a fuel cell with a blocked anode cell

#196
20100119907
2010-05-13

Polymer electrolyte fuel cell and method for measuring voltages of cells in polymer electrolyte fuel cell

#197
20100108535
2010-05-06

SYSTEM FOR GENERATING HYDROGEN AND METHOD THEREOF

#198
20100047644
2010-02-25

Fuel cell system with a scavenging device and AC impedance measuring unit

#199
20100003568
2010-01-07

Fuel-cell and fuel cell system including the same

#200
20090246570
2009-10-01

METHOD AND APPARATUS FOR MEASURING CROSSOVER LOSS OF FUEL CELL

#201
20090214765
2009-08-27

Fuel Cell Anode Structures For Voltage Reversal Tolerance

#202
20090197155
2009-08-06

Online low performing cell (LPC) prediction and detection of fuel cell system

#203
20090191437
2009-07-30

Fuel cell system

#204
20090169927
2009-07-02

Fuel cell system

#205
20090047556
2009-02-19

FUEL CELL SYSTEM

#206
20090029213
2009-01-29

Method for detecting abnormality in fuel cell

#207
20080286633
2008-11-20

Circuit testing device for solid oxide fuel cell

#208
20080220301
2008-09-11

Fuel cell including bypass circuit for interconnecting fuel cells

#209
20080213643
2008-09-04

Electricity production installation comprising fuel cells connected in series and comprising means for isolating a cell and method for monitoring such an installation

#210
20080208490
2008-08-28

Failure determination device for cell voltage monitor

#211
20080094054
2008-04-24

Fuel Cell State Monitor Apparatus and Method

#212
20080042654
2008-02-21

Fuel cell diagnostic apparatus and diagnostic method

#213
20080012570
2008-01-17

Monitoring battery cell voltage

#214
20070231641
2007-10-04

Optical fuel cell stack cell voltage monitor

#215
20070148507
2007-06-28

Switching modes of operation of a fuel cell

#216
20070141414
2007-06-21

Fuel cell having micro sensors

#217
20070099046
2007-05-03

Electronic equipment provided with voltage check unit

#218
20070013382
2007-01-18

Method for detection and diagnosis of isolation faults in fuel cell hybrid vehicles

#219
20060286420
2006-12-21

Fuel cell system configured to detect failure and process for dealing with failure of the system

#220
20060257703
2006-11-16

Method for manufacturing solid oxide electrochemical devices

#221
20060240297
2006-10-26

Fuel cell unit and power generating system using the fuel cell unit

#222
20060199049
2006-09-07

Monitoring system for fuel cell stack

#223
20060188766
2006-08-24

Fuel cell system and method of controlling same

#224
20060113986
2006-06-01

Apparatus and method for measuring voltage of the fuel cell stack using a capacitor

#225
20060078788
2006-04-13

Method for monitoring the operational state of a fuel cell stack

#226
20060057447
2006-03-16

Fuel cell system

#227
20050142417
2005-06-30

Terminal member to be connected for cell voltage-measuring use

#228
20050129988
2005-06-16

Electrochemical fuel cell stack having a plurality of integrated voltage reversal protection diodes

#229
20050121315
2005-06-09

System for generating hydrogen and method thereof

#230
20050106426
2005-05-19

Method of monitoring a fuel cell unit

#231
20050064252
2005-03-24

Method for operating polymer electrolyte fuel cell

#232
20050019621
2005-01-27

Power supply system

#233
18459748
2024-04-09

Systems and methods for monitoring fuel cell membrane degradation

#234
18152989
2023-11-07

Systems and methods for monitoring fuel cell membrane degradation

#235
13773342
2015-05-26

Reconfigurable microbial fuel cell