CN111030431B - 半导体装置 - Google Patents

半导体装置 Download PDF

Info

Publication number
CN111030431B
CN111030431B CN201910918651.1A CN201910918651A CN111030431B CN 111030431 B CN111030431 B CN 111030431B CN 201910918651 A CN201910918651 A CN 201910918651A CN 111030431 B CN111030431 B CN 111030431B
Authority
CN
China
Prior art keywords
voltage
circuit
gate
signal processing
igbt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910918651.1A
Other languages
English (en)
Chinese (zh)
Other versions
CN111030431A (zh
Inventor
佐藤克己
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of CN111030431A publication Critical patent/CN111030431A/zh
Application granted granted Critical
Publication of CN111030431B publication Critical patent/CN111030431B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/08Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/567Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/08Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
    • H02M5/42Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
    • H02M5/44Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
    • H02M5/443Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/45Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/155Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/162Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
    • H02M7/1623Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53873Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/602Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors in integrated circuits
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/78Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D12/00Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
    • H10D12/411Insulated-gate bipolar transistors [IGBT]
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D12/00Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
    • H10D12/411Insulated-gate bipolar transistors [IGBT]
    • H10D12/441Vertical IGBTs
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D12/00Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
    • H10D12/411Insulated-gate bipolar transistors [IGBT]
    • H10D12/441Vertical IGBTs
    • H10D12/461Vertical IGBTs having non-planar surfaces, e.g. having trenches, recesses or pillars in the surfaces of the emitter, base or collector regions
    • H10D12/481Vertical IGBTs having non-planar surfaces, e.g. having trenches, recesses or pillars in the surfaces of the emitter, base or collector regions having gate structures on slanted surfaces, on vertical surfaces, or in grooves, e.g. trench gate IGBTs
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D12/00Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
    • H10D12/411Insulated-gate bipolar transistors [IGBT]
    • H10D12/441Vertical IGBTs
    • H10D12/491Vertical IGBTs having both emitter contacts and collector contacts in the same substrate side
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D64/00Electrodes of devices having potential barriers
    • H10D64/20Electrodes characterised by their shapes, relative sizes or dispositions 
    • H10D64/27Electrodes not carrying the current to be rectified, amplified, oscillated or switched, e.g. gates
    • H10D64/311Gate electrodes for field-effect devices
    • H10D64/411Gate electrodes for field-effect devices for FETs
    • H10D64/511Gate electrodes for field-effect devices for FETs for IGFETs
    • H10D64/512Disposition of the gate electrodes, e.g. buried gates
    • H10D64/513Disposition of the gate electrodes, e.g. buried gates within recesses in the substrate, e.g. trench gates, groove gates or buried gates
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K2217/00Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/0063High side switches, i.e. the higher potential [DC] or life wire [AC] being directly connected to the switch and not via the load
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K2217/00Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/0072Low side switches, i.e. the lower potential [DC] or neutral wire [AC] being directly connected to the switch and not via the load
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K2217/00Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/0081Power supply means, e.g. to the switch driver
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D18/00Thyristors
    • H10D18/80Bidirectional devices, e.g. triacs 
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D62/00Semiconductor bodies, or regions thereof, of devices having potential barriers
    • H10D62/10Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
    • H10D62/17Semiconductor regions connected to electrodes not carrying current to be rectified, amplified or switched, e.g. channel regions
    • H10D62/393Body regions of DMOS transistors or IGBTs 

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Conversion In General (AREA)
  • Electronic Switches (AREA)
CN201910918651.1A 2018-10-09 2019-09-26 半导体装置 Active CN111030431B (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-190723 2018-10-09
JP2018190723A JP7002431B2 (ja) 2018-10-09 2018-10-09 半導体装置

Publications (2)

Publication Number Publication Date
CN111030431A CN111030431A (zh) 2020-04-17
CN111030431B true CN111030431B (zh) 2023-06-09

Family

ID=69886345

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910918651.1A Active CN111030431B (zh) 2018-10-09 2019-09-26 半导体装置

Country Status (4)

Country Link
US (1) US10720918B2 (https=)
JP (1) JP7002431B2 (https=)
CN (1) CN111030431B (https=)
DE (1) DE102019215250A1 (https=)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3993249A1 (en) * 2020-10-28 2022-05-04 NXP USA, Inc. Advanced power supply to insure safe behavior of an inverter application
JP7444027B2 (ja) * 2020-11-06 2024-03-06 三菱電機株式会社 半導体装置
JP7722648B2 (ja) 2020-12-04 2025-08-13 国立大学法人 東京大学 半導体装置
JP7578356B2 (ja) * 2021-09-01 2024-11-06 ミネベアパワーデバイス株式会社 駆動回路および電力変換装置
JP2024174702A (ja) * 2023-06-05 2024-12-17 ミネベアパワーデバイス株式会社 駆動回路

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02155456A (ja) * 1988-12-06 1990-06-14 Toshiba Corp ダブルゲートigbtのゲート駆動回路
JP2002100971A (ja) * 2000-09-22 2002-04-05 Toshiba Corp ダブルゲートigbtの駆動方法
JP2003101391A (ja) * 2001-07-19 2003-04-04 Mitsubishi Electric Corp 半導体装置
CN105191132A (zh) * 2013-05-10 2015-12-23 株式会社日立制作所 绝缘栅型半导体元件的控制装置以及使用了该控制装置的电力变换装置
CN108475675A (zh) * 2016-01-27 2018-08-31 株式会社电装 半导体装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3302725B2 (ja) * 1991-08-26 2002-07-15 株式会社東芝 電力用半導体集積回路装置
DE69332443T2 (de) * 1992-05-01 2003-06-26 Fuji Electric Co., Ltd. Steuervorrichtung für Halbleitervorrichtung mit doppeltem Gate
JPH11205123A (ja) * 1998-01-20 1999-07-30 Toshiba Corp 高耐圧パワー集積回路
KR20010041822A (ko) * 1998-03-09 2001-05-25 스콧 티. 마이쿠엔 저온 직접 결합에 의해 형성가능한 소자
JP2005340624A (ja) * 2004-05-28 2005-12-08 Fuji Electric Device Technology Co Ltd 半導体集積回路装置
JP2006073775A (ja) * 2004-09-02 2006-03-16 Matsushita Electric Ind Co Ltd 半導体装置及びそれを用いたモジュール
JP2011182591A (ja) * 2010-03-02 2011-09-15 Panasonic Corp 半導体装置
JP5828093B2 (ja) * 2010-10-25 2015-12-02 パナソニックIpマネジメント株式会社 電源装置
JP2016039477A (ja) * 2014-08-07 2016-03-22 株式会社デンソー 駆動制御装置
CN106663676B (zh) * 2014-08-29 2019-05-28 三菱电机株式会社 半导体装置以及多相用半导体装置
JP6413965B2 (ja) * 2015-07-20 2018-10-31 株式会社デンソー 半導体装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02155456A (ja) * 1988-12-06 1990-06-14 Toshiba Corp ダブルゲートigbtのゲート駆動回路
JP2002100971A (ja) * 2000-09-22 2002-04-05 Toshiba Corp ダブルゲートigbtの駆動方法
JP2003101391A (ja) * 2001-07-19 2003-04-04 Mitsubishi Electric Corp 半導体装置
CN105191132A (zh) * 2013-05-10 2015-12-23 株式会社日立制作所 绝缘栅型半导体元件的控制装置以及使用了该控制装置的电力变换装置
CN108475675A (zh) * 2016-01-27 2018-08-31 株式会社电装 半导体装置

Also Published As

Publication number Publication date
JP2020061429A (ja) 2020-04-16
CN111030431A (zh) 2020-04-17
US10720918B2 (en) 2020-07-21
JP7002431B2 (ja) 2022-01-20
US20200112307A1 (en) 2020-04-09
DE102019215250A1 (de) 2020-04-09

Similar Documents

Publication Publication Date Title
CN111030431B (zh) 半导体装置
JP5267616B2 (ja) 駆動制御装置
CN101414816B (zh) 具有内置二极管的igbt器件和具有内置二极管的dmos器件
JP6591220B2 (ja) 半導体装置および電力制御装置
US9866207B2 (en) Semiconductor device, power control device and electronic system
KR101655519B1 (ko) 역-도전 절연 게이트 바이폴라 트랜지스터 및 게이트 구동기 회로를 갖는 전자 회로
US9912329B2 (en) Semiconductor device and driving system
US20170141677A1 (en) Switching Device for Power Conversion and Power Conversion Device
JP5284077B2 (ja) 半導体装置ならびにそれを用いた電力変換装置
JP6633861B2 (ja) 半導体装置
KR102178107B1 (ko) 프리휠링 SiC 다이오드를 갖는 RC-IGBT
CN109962699A (zh) 用于控制mosfet开关模块的方法和装置
CN106911250A (zh) 电力转换系统、功率模块及半导体器件
JP7078619B2 (ja) 並列逆導通igbtおよびワイドバンドギャップスイッチのスイッチング
US9698772B2 (en) Drive circuit for reverse-conducting IGBTs
US20220149839A1 (en) Semiconductor device
JP5534076B2 (ja) 駆動制御装置
KR100659384B1 (ko) 전력용 igbt소자 및 igbt의 구동회로
US10217765B2 (en) Semiconductor integrated circuit
US10778216B2 (en) Control circuit, semiconductor device, and electrical circuit device
US20250311396A1 (en) Power conversion device, method of controlling power conversion device, semiconductor device, and method of controlling semiconductor device
JP2020099039A (ja) 双方向スイッチ
US20150279979A1 (en) Semiconductor device and electric power converter in which same is used
WO2024057598A1 (ja) 半導体スイッチング素子のゲート駆動回路、電動機制御システムおよび半導体装置
US20030122149A1 (en) Complex semiconductor device and electric power conversion appratus using it

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant