DE69129858D1 - Verbrennungsanlage mit vermindertem ausstoss von stickstoffoxiden - Google Patents
Verbrennungsanlage mit vermindertem ausstoss von stickstoffoxidenInfo
- Publication number
- DE69129858D1 DE69129858D1 DE69129858T DE69129858T DE69129858D1 DE 69129858 D1 DE69129858 D1 DE 69129858D1 DE 69129858 T DE69129858 T DE 69129858T DE 69129858 T DE69129858 T DE 69129858T DE 69129858 D1 DE69129858 D1 DE 69129858D1
- Authority
- DE
- Germany
- Prior art keywords
- combustion
- nitrogen oxides
- combustion plant
- reduced emissions
- pyrolyzing
- 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.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
- F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
- F23C7/006—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes adjustable
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2201/00—Staged combustion
- F23C2201/20—Burner staging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/20—Premixing fluegas with fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/06043—Burner staging, i.e. radially stratified flame core burners
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US59367990A | 1990-10-05 | 1990-10-05 | |
US77173991A | 1991-10-04 | 1991-10-04 | |
PCT/US1991/007406 WO1992006328A1 (en) | 1990-10-05 | 1991-10-07 | Combustion system for reduction of nitrogen oxides |
Publications (2)
Publication Number | Publication Date |
---|---|
DE69129858D1 true DE69129858D1 (de) | 1998-08-27 |
DE69129858T2 DE69129858T2 (de) | 1998-12-03 |
Family
ID=27081766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69129858T Expired - Lifetime DE69129858T2 (de) | 1990-10-05 | 1991-10-07 | Verbrennungsanlage mit vermindertem ausstoss von stickstoffoxiden |
Country Status (6)
Country | Link |
---|---|
US (1) | US5411394A (de) |
EP (1) | EP0550700B1 (de) |
AT (1) | ATE168759T1 (de) |
CA (1) | CA2093316C (de) |
DE (1) | DE69129858T2 (de) |
WO (1) | WO1992006328A1 (de) |
Families Citing this family (86)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5333574A (en) * | 1991-09-11 | 1994-08-02 | Mark Iv Transportation Products Corporation | Compact boiler having low NOX emissions |
DE4217879A1 (de) * | 1992-05-29 | 1993-12-02 | Babcock Energie Umwelt | Brenner für staubförmigen Brennstoff |
EP0599395A1 (de) * | 1992-11-20 | 1994-06-01 | WITTEVEEN, Gustaaf Jan | Brenner mit niedrigem NOx-Ausstoss |
US5511971A (en) * | 1993-08-23 | 1996-04-30 | Benz; Robert P. | Low nox burner process for boilers |
USRE36373E (en) * | 1993-08-23 | 1999-11-02 | Benz; Robert P. | Low NOx burner process for boilers |
US5426933A (en) * | 1994-01-11 | 1995-06-27 | Solar Turbines Incorporated | Dual feed injection nozzle with water injection |
US5560305A (en) * | 1994-12-15 | 1996-10-01 | The Boc Group, Inc. | Burner block and method for furnace |
DE19527083A1 (de) * | 1995-07-25 | 1997-01-30 | Lentjes Kraftwerkstechnik | Verfahren und Brenner zur Verminderung der Bildung von NO¶x¶ bei der Verbrennung von Kohlenstaub |
DE19536672A1 (de) * | 1995-09-30 | 1997-04-03 | Abb Research Ltd | Verfahren und Vorrichtung zur Verbrennung von Brennstoffen |
HUP0004867A3 (en) | 1996-06-19 | 2001-05-28 | Alstom Power Inc Windsor | A method for effecting control over an rsfc burner |
US5829369A (en) * | 1996-11-12 | 1998-11-03 | The Babcock & Wilcox Company | Pulverized coal burner |
EP0866269B1 (de) * | 1997-03-18 | 2002-11-27 | ALSTOM (Switzerland) Ltd | Kesselanlage für eine Wärmeerzeugung |
US6007326A (en) * | 1997-08-04 | 1999-12-28 | Praxair Technology, Inc. | Low NOx combustion process |
FR2772118B1 (fr) * | 1997-12-05 | 2001-08-17 | Saint Gobain Vitrage | Procede de combustion et bruleur a pulverisation de combustible mettant en oeuvre un tel procede |
EP0931979A1 (de) * | 1998-01-23 | 1999-07-28 | DVGW Deutscher Verein des Gas- und Wasserfaches -Technisch-wissenschaftliche Vereinigung- | Vorrichtung zur Unterdrückung von Flammen-/Druckschwingungen bei einer Feuerung insbesondere einer Gasturbine |
JP3343855B2 (ja) * | 1998-01-30 | 2002-11-11 | 株式会社日立製作所 | 微粉炭燃焼バーナ及び微粉炭燃焼バーナの燃焼方法 |
US20080286704A1 (en) * | 1998-11-18 | 2008-11-20 | Hermann Bruggendick | Method of burning a nitrogen-containing fuel |
WO2001013042A1 (fr) * | 1999-08-16 | 2001-02-22 | Nippon Furnace Kogyo Kaisha, Ltd. | Appareil et procede d'alimentation en carburant |
US6383461B1 (en) * | 1999-10-26 | 2002-05-07 | John Zink Company, Llc | Fuel dilution methods and apparatus for NOx reduction |
US6453830B1 (en) * | 2000-02-29 | 2002-09-24 | Bert Zauderer | Reduction of nitrogen oxides by staged combustion in combustors, furnaces and boilers |
US6558153B2 (en) | 2000-03-31 | 2003-05-06 | Aqua-Chem, Inc. | Low pollution emission burner |
EP1219895A1 (de) * | 2000-12-28 | 2002-07-03 | Oertli Induflame AG | Verbrennungsverfahren mit reduziertem Stickoxidausstoss |
US6699030B2 (en) | 2001-01-11 | 2004-03-02 | Praxair Technology, Inc. | Combustion in a multiburner furnace with selective flow of oxygen |
US20020127505A1 (en) | 2001-01-11 | 2002-09-12 | Hisashi Kobayashi | Oxygen enhanced low nox combustion |
US6699029B2 (en) | 2001-01-11 | 2004-03-02 | Praxair Technology, Inc. | Oxygen enhanced switching to combustion of lower rank fuels |
US6699031B2 (en) | 2001-01-11 | 2004-03-02 | Praxair Technology, Inc. | NOx reduction in combustion with concentrated coal streams and oxygen injection |
US6702569B2 (en) | 2001-01-11 | 2004-03-09 | Praxair Technology, Inc. | Enhancing SNCR-aided combustion with oxygen addition |
US6551098B2 (en) * | 2001-02-22 | 2003-04-22 | Rheem Manufacturing Company | Variable firing rate fuel burner |
US6908298B1 (en) | 2001-10-30 | 2005-06-21 | Owen W. Dykema | Air-fuel injection system for stable combustion |
FR2837263B1 (fr) * | 2002-03-12 | 2004-09-24 | Air Liquide | Procede de mise en oeuvre d'une chaudiere de recuperation de chaleur |
AU2003237815B2 (en) * | 2002-05-15 | 2008-07-17 | Praxair Technology, Inc. | Low nox combustion |
ES2601702T3 (es) | 2002-05-15 | 2017-02-16 | Praxair Technology, Inc. | Combustión con reducido carbono en la ceniza |
US20030234455A1 (en) * | 2002-06-24 | 2003-12-25 | Mieney Harry R. | Non-contacting fuel vaporizer |
US6907724B2 (en) * | 2002-09-13 | 2005-06-21 | The Boeing Company | Combined cycle engines incorporating swirl augmented combustion for reduced volume and weight and improved performance |
US6895756B2 (en) * | 2002-09-13 | 2005-05-24 | The Boeing Company | Compact swirl augmented afterburners for gas turbine engines |
US6968695B2 (en) * | 2002-09-13 | 2005-11-29 | The Boeing Company | Compact lightweight ramjet engines incorporating swirl augmented combustion with improved performance |
US6820411B2 (en) * | 2002-09-13 | 2004-11-23 | The Boeing Company | Compact, lightweight high-performance lift thruster incorporating swirl-augmented oxidizer/fuel injection, mixing and combustion |
DE602004029648D1 (de) * | 2003-01-21 | 2010-12-02 | Air Liquide | Verfahren und vorrichtung zur sauerstoffanreicherung in brennstoff fördernden gasen |
US7163392B2 (en) * | 2003-09-05 | 2007-01-16 | Feese James J | Three stage low NOx burner and method |
US7484956B2 (en) * | 2003-09-16 | 2009-02-03 | Praxair Technology, Inc. | Low NOx combustion using cogenerated oxygen and nitrogen streams |
DE102004003343A1 (de) * | 2004-01-22 | 2005-08-11 | Linde Ag | Flexibler Parallelstrombrenner mit Drallkammer |
US20050227195A1 (en) * | 2004-04-08 | 2005-10-13 | George Kenneth R | Combustion burner assembly having low oxides of nitrogen emission |
US7168947B2 (en) * | 2004-07-06 | 2007-01-30 | General Electric Company | Methods and systems for operating combustion systems |
US7264466B2 (en) * | 2004-09-10 | 2007-09-04 | North American Manufacturing Company | Method and apparatus for radiant tube combustion |
US7766649B2 (en) * | 2005-03-07 | 2010-08-03 | Gas Technology Institute | Multi-ported, internally recuperated burners for direct flame impingement heating applications |
CA2603529A1 (en) * | 2005-04-05 | 2006-10-12 | Sargas As | Low co2 thermal powerplant |
US20060275724A1 (en) * | 2005-06-02 | 2006-12-07 | Joshi Mahendra L | Dynamic burner reconfiguration and combustion system for process heaters and boilers |
US7430970B2 (en) * | 2005-06-30 | 2008-10-07 | Larue Albert D | Burner with center air jet |
US20070269755A2 (en) * | 2006-01-05 | 2007-11-22 | Petro-Chem Development Co., Inc. | Systems, apparatus and method for flameless combustion absent catalyst or high temperature oxidants |
US20120266792A1 (en) * | 2006-05-17 | 2012-10-25 | Majed Toqan | Combustion Stabilization Systems |
US8215949B2 (en) * | 2006-05-17 | 2012-07-10 | Majed Toqan | Combustion stabilization systems |
FR2903479A1 (fr) * | 2006-07-06 | 2008-01-11 | Air Liquide | Bruleur a flamme orientable et procede de mise en oeuvre |
US7762077B2 (en) * | 2006-12-05 | 2010-07-27 | Pratt & Whitney Rocketdyne, Inc. | Single-stage hypersonic vehicle featuring advanced swirl combustion |
US20080128547A1 (en) * | 2006-12-05 | 2008-06-05 | Pratt & Whitney Rocketdyne, Inc. | Two-stage hypersonic vehicle featuring advanced swirl combustion |
US7762058B2 (en) * | 2007-04-17 | 2010-07-27 | Pratt & Whitney Rocketdyne, Inc. | Ultra-compact, high performance aerovortical rocket thruster |
US7690192B2 (en) | 2007-04-17 | 2010-04-06 | Pratt & Whitney Rocketdyne, Inc. | Compact, high performance swirl combustion rocket engine |
EP2080952A1 (de) * | 2008-01-17 | 2009-07-22 | L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Brenner und Verfahren zur abwechselnden Durchführung von Sauerstoffverbrennung und Luftverbrennung |
US7775791B2 (en) * | 2008-02-25 | 2010-08-17 | General Electric Company | Method and apparatus for staged combustion of air and fuel |
EP2107311A1 (de) * | 2008-04-01 | 2009-10-07 | Siemens Aktiengesellschaft | Größenskalierung eines Brenners |
US20090280442A1 (en) * | 2008-05-05 | 2009-11-12 | American Air Liquide Inc. | Device And Method Of Combusting Solid Fuel With Oxygen |
US20100035193A1 (en) * | 2008-08-08 | 2010-02-11 | Ze-Gen, Inc. | Method and system for fuel gas combustion, and burner for use therein |
WO2010036877A2 (en) * | 2008-09-26 | 2010-04-01 | Air Products And Chemicals, Inc. | Combustion system with precombustor for recycled flue gas |
US20100077942A1 (en) * | 2008-09-26 | 2010-04-01 | Air Products And Chemicals, Inc. | Oxy/fuel combustion system with little or no excess oxygen |
DE102009014223A1 (de) * | 2009-03-25 | 2010-09-30 | Hitachi Power Europe Gmbh | Feuerungssystem eines für den Oxyfuel-Betrieb ausgelegten Dampferzeugers |
US20100281872A1 (en) * | 2009-05-06 | 2010-11-11 | Mark Allan Hadley | Airblown Syngas Fuel Nozzle With Diluent Openings |
US8607570B2 (en) * | 2009-05-06 | 2013-12-17 | General Electric Company | Airblown syngas fuel nozzle with diluent openings |
US20100281869A1 (en) * | 2009-05-06 | 2010-11-11 | Mark Allan Hadley | Airblown Syngas Fuel Nozzle With Diluent Openings |
US20110045420A1 (en) * | 2009-08-21 | 2011-02-24 | Alstom Technology Ltd | Burner monitor and control |
PL2513345T3 (pl) * | 2009-11-26 | 2016-07-29 | Linde Ag | Sposób ogrzewania nagrzewnicy wielkopiecowej |
EP2672180B1 (de) * | 2011-01-31 | 2018-04-25 | IHI Corporation | Betriebsverfahren einer brennervorrichtung für hochtemperatur-luftverbrennung |
DE102011011207A1 (de) * | 2011-02-14 | 2012-08-16 | Air Liquide Deutschland Gmbh | Brenner zum gleichmäßigen Erwärmen eines langen Ofens |
EP2500640A1 (de) * | 2011-03-16 | 2012-09-19 | L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Verbrennungsverfahren mit niedrigen NOx-Werten und Brenner dafür |
US8920159B2 (en) * | 2011-11-23 | 2014-12-30 | Honeywell International Inc. | Burner with oxygen and fuel mixing apparatus |
US20130327050A1 (en) * | 2012-06-07 | 2013-12-12 | General Electric Company | Controlling flame stability of a gas turbine generator |
US10215412B2 (en) * | 2012-11-02 | 2019-02-26 | General Electric Company | System and method for load control with diffusion combustion in a stoichiometric exhaust gas recirculation gas turbine system |
US9909755B2 (en) * | 2013-03-15 | 2018-03-06 | Fives North American Combustion, Inc. | Low NOx combustion method and apparatus |
CN103272728B (zh) * | 2013-06-09 | 2017-01-25 | 潍柴动力股份有限公司 | Scr***及其尿素喷头 |
EP2821699A1 (de) * | 2013-07-02 | 2015-01-07 | Haldor Topsøe A/S | Mischen von Zirkulationsgas mit Brenngas zu einem Brenner |
US10281140B2 (en) | 2014-07-15 | 2019-05-07 | Chevron U.S.A. Inc. | Low NOx combustion method and apparatus |
EP3198198A1 (de) | 2014-09-26 | 2017-08-02 | Innecs B.V. | Brenner |
US10274194B2 (en) * | 2014-12-19 | 2019-04-30 | Utilization Technology Development, Nfp | Methods and systems for reducing emissions of nitrogen oxides from ribbon burners |
FR3039254B1 (fr) * | 2015-07-24 | 2021-10-08 | Snecma | Chambre de combustion comportant des dispositifs d'injection additionnels debouchant directement dans les zones de recirculation de coin, turbomachine la comprenant, et procede d'alimentation en carburant de celle-ci |
US10753267B2 (en) * | 2018-01-26 | 2020-08-25 | Quest Engines, LLC | Method and apparatus for producing stratified streams |
CN108507917B (zh) * | 2018-04-20 | 2021-12-03 | 南京恒瑞环保科技有限公司 | 转炉一次烟气除尘***除尘能力的检测方法 |
US11866361B2 (en) * | 2019-10-29 | 2024-01-09 | Honeywell International Inc. | Fuel gas and oxygen burner |
US10845052B1 (en) | 2019-12-20 | 2020-11-24 | Jupiter Oxygen Corporation | Combustion system comprising an annular shroud burner |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2515845A (en) * | 1946-06-25 | 1950-07-18 | Shell Dev | Flame pocket fluid fuel burner |
FR1094871A (fr) * | 1959-01-22 | 1955-05-25 | Thomson Houston Comp Francaise | Perfectionnements aux appareils de combustion à combustible injecté |
US3576384A (en) * | 1968-11-29 | 1971-04-27 | British American Oil Co | Multinozzle system for vortex burners |
DE2724532A1 (de) * | 1977-05-31 | 1978-12-14 | Peabody Environmental Systems | Brennervorrichtung fuer oel und/oder gas |
SU817383A1 (ru) * | 1977-10-18 | 1981-03-30 | Kotler Vladlen R | Способ сжигани твердого топлива |
US4270895A (en) * | 1978-06-29 | 1981-06-02 | Foster Wheeler Energy Corporation | Swirl producer |
DE2933060C2 (de) * | 1979-08-16 | 1987-01-22 | L. & C. Steinmüller GmbH, 5270 Gummersbach | Brenner zur Verbrennung von staubförmigen Brennstoffen |
DE2933040C2 (de) * | 1979-08-16 | 1988-12-22 | L. & C. Steinmüller GmbH, 5270 Gummersbach | Verfahren zum Zünden einer Kohlenstaub-Rundbrennerflamme |
US4845940A (en) * | 1981-02-27 | 1989-07-11 | Westinghouse Electric Corp. | Low NOx rich-lean combustor especially useful in gas turbines |
US4422391A (en) * | 1981-03-12 | 1983-12-27 | Kawasaki Jukogyo Kabushiki Kaisha | Method of combustion of pulverized coal by pulverized coal burner |
DE3125901A1 (de) * | 1981-07-01 | 1983-01-20 | Deutsche Babcock Ag, 4200 Oberhausen | Brenner zum verbrennen von staubfoermigen brennstoffen |
US4523530A (en) * | 1982-02-26 | 1985-06-18 | Sumitomo Metal Industries, Ltd. | Powdery coal burner |
US4407205A (en) * | 1982-04-30 | 1983-10-04 | Beaufrere Albert H | Regeneratively cooled coal combustor/gasifier with integral dry ash removal |
US4569295A (en) * | 1983-01-18 | 1986-02-11 | Stubinen Utveckling Ab | Process and a means for burning solid fuels, preferably coal, turf or the like, in pulverized form |
JPS60174408A (ja) * | 1984-02-20 | 1985-09-07 | Kawasaki Heavy Ind Ltd | 燃焼室の2段燃焼用空気孔 |
JPS60226609A (ja) * | 1984-04-23 | 1985-11-11 | Babcock Hitachi Kk | 燃焼装置 |
US4539918A (en) * | 1984-10-22 | 1985-09-10 | Westinghouse Electric Corp. | Multiannular swirl combustor providing particulate separation |
US4604052A (en) * | 1985-04-29 | 1986-08-05 | The United States Of America As Represented By The United States Department Of Energy | Dual-water mixture fuel burner |
FR2581444B1 (fr) * | 1985-05-03 | 1988-11-10 | Charbonnages De France | Procede pour la combustion de combustibles fluides et bruleur a turbulence adapte a sa mise en oeuvre |
EP0233680B2 (de) * | 1986-01-08 | 1993-10-27 | Hitachi, Ltd. | Verfahren und Vorrichtung zur Verbrennung eines Kohlenstaub-Wassergemisches |
US4915619A (en) * | 1988-05-05 | 1990-04-10 | The Babcock & Wilcox Company | Burner for coal, oil or gas firing |
US4927352A (en) * | 1988-07-19 | 1990-05-22 | Landy Chung | Boiler furnace air register |
-
1991
- 1991-10-07 DE DE69129858T patent/DE69129858T2/de not_active Expired - Lifetime
- 1991-10-07 CA CA002093316A patent/CA2093316C/en not_active Expired - Lifetime
- 1991-10-07 WO PCT/US1991/007406 patent/WO1992006328A1/en active IP Right Grant
- 1991-10-07 EP EP92902517A patent/EP0550700B1/de not_active Expired - Lifetime
- 1991-10-07 AT AT92902517T patent/ATE168759T1/de not_active IP Right Cessation
-
1993
- 1993-10-05 US US08/131,867 patent/US5411394A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US5411394A (en) | 1995-05-02 |
CA2093316C (en) | 2002-12-03 |
EP0550700B1 (de) | 1998-07-22 |
ATE168759T1 (de) | 1998-08-15 |
EP0550700A4 (en) | 1993-08-25 |
EP0550700A1 (de) | 1993-07-14 |
WO1992006328A1 (en) | 1992-04-16 |
CA2093316A1 (en) | 1992-04-06 |
DE69129858T2 (de) | 1998-12-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition |