DE69908416D1 - Verfahren und vorrichtung zur herstellung von celluloseethern - Google Patents

Verfahren und vorrichtung zur herstellung von celluloseethern

Info

Publication number
DE69908416D1
DE69908416D1 DE69908416T DE69908416T DE69908416D1 DE 69908416 D1 DE69908416 D1 DE 69908416D1 DE 69908416 T DE69908416 T DE 69908416T DE 69908416 T DE69908416 T DE 69908416T DE 69908416 D1 DE69908416 D1 DE 69908416D1
Authority
DE
Germany
Prior art keywords
cellulose ethers
producing cellulose
producing
ethers
cellulose
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
Application number
DE69908416T
Other languages
English (en)
Other versions
DE69908416T2 (de
Inventor
J Schulz
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.)
Dow Global Technologies LLC
Original Assignee
Dow Global Technologies LLC
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22753504&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE69908416(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Dow Global Technologies LLC filed Critical Dow Global Technologies LLC
Application granted granted Critical
Publication of DE69908416D1 publication Critical patent/DE69908416D1/de
Publication of DE69908416T2 publication Critical patent/DE69908416T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B17/00—Apparatus for esterification or etherification of cellulose
    • C08B17/06—Apparatus for esterification or etherification of cellulose for making cellulose ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/20—Post-etherification treatments of chemical or physical type, e.g. mixed etherification in two steps, including purification

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
DE69908416T 1998-12-01 1999-10-07 Verfahren und vorrichtung zur herstellung von celluloseethern Expired - Lifetime DE69908416T2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/203,324 US6261218B1 (en) 1998-12-01 1998-12-01 Process and apparatus for making low molecular weight cellulose ethers
US203324 1998-12-01
PCT/US1999/023475 WO2000032637A1 (en) 1998-12-01 1999-10-07 Process and apparatus for making cellulose ethers

Publications (2)

Publication Number Publication Date
DE69908416D1 true DE69908416D1 (de) 2003-07-03
DE69908416T2 DE69908416T2 (de) 2004-04-01

Family

ID=22753504

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69908416T Expired - Lifetime DE69908416T2 (de) 1998-12-01 1999-10-07 Verfahren und vorrichtung zur herstellung von celluloseethern

Country Status (9)

Country Link
US (1) US6261218B1 (de)
EP (1) EP1141029B1 (de)
JP (1) JP5117646B2 (de)
AR (1) AR021436A1 (de)
AT (1) ATE241647T1 (de)
AU (1) AU6511799A (de)
DE (1) DE69908416T2 (de)
ES (1) ES2194520T3 (de)
WO (1) WO2000032637A1 (de)

Families Citing this family (79)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6686464B1 (en) 1999-04-26 2004-02-03 Bki Holding Corporation Cellulose ethers and method of preparing the same
DE19941893A1 (de) * 1999-09-03 2001-03-08 Clariant Gmbh Niederviskose, heisswasser-flockbare Celluloseether, Verfahren zu deren Herstellung durch Depolymerisation sowie deren Verwendung
DE10009642C1 (de) * 2000-03-01 2001-06-13 Clariant Gmbh Verfahren zur sauer katalysierten, hydrolytischen Depolymerisierung von Celluloseethern und Verwendung einer emaillierten Drucknutsche zur Depolymerisierung von Celluloseethern
CA2427698A1 (en) 2000-11-01 2002-05-10 Bki Holding Corporation Cellulose ethers and method of preparing the same
US6405801B1 (en) * 2000-12-08 2002-06-18 Halliburton Energy Services, Inc. Environmentally acceptable well cement fluid loss control additives, compositions and methods
DE10141680B4 (de) * 2001-08-25 2004-02-26 Clariant Gmbh Verfahren zur Herstellung niederviskoser Celluloseether durch sauer-oxidativen Abbau von gemahlenen und getrockneten Celluloseethern
KR100461565B1 (ko) * 2001-09-22 2004-12-14 삼성정밀화학 주식회사 저점도 히드록시프로필메틸 셀룰로오스의 제조방법
CN100509852C (zh) * 2002-07-26 2009-07-08 Fmc有限公司 微晶纤维素的制造
US8865432B2 (en) * 2004-02-26 2014-10-21 Shin-Etsu Chemical Co., Ltd. Method for preparing cellulose derivatives having solubility improved
KR101241845B1 (ko) * 2004-05-26 2013-03-12 다우 글로벌 테크놀로지스 엘엘씨 저분자량 에틸셀룰로오즈의 제조방법
US20070179292A1 (en) * 2004-05-26 2007-08-02 Spencer Michael V Production of low molecular weight ethylcellulose
CN101001881A (zh) * 2005-08-22 2007-07-18 信越化学工业株式会社 溶解度提高的纤维素衍生物的制造方法
EP1764373B1 (de) 2005-09-17 2016-04-27 Dow Global Technologies LLC Verfahren zur Herstellung von Methylhydroxyalkylcellulose mit einer geringen Anzahl gefärbter Partikel
ES2640773T3 (es) * 2006-01-30 2017-11-06 Hercules Llc Proceso para fabricar éteres de celulosa dispersables en agua fría
ATE519785T1 (de) * 2006-06-14 2011-08-15 Dow Global Technologies Llc Verfahren zur verringerung des mittleren molekulargewichts von celluloseethern
KR101556517B1 (ko) * 2007-11-09 2015-10-01 다우 글로벌 테크놀로지스 엘엘씨 셀룰로스 에테르 피복 조성물 및 방법
EP2428523B1 (de) * 2010-09-14 2017-12-06 Shin-Etsu Chemical Co., Ltd. Verfahren zur Herstellung von niedrigsubstituierter Hydroxypropylcellulose
CN103261233B (zh) 2010-10-12 2016-05-25 陶氏环球技术有限责任公司 新的纤维素醚以及它们的用途
DE102010052602A1 (de) * 2010-11-25 2012-05-31 Studiengesellschaft Kohle Mbh Verfahren zur säurekatalysierten Depolymerisation von Cellulose
WO2013016059A1 (en) 2011-07-27 2013-01-31 Dow Global Technologies Llc Method of removing alkylene halogenohydrin from cellulose ether
CN102276733B (zh) * 2011-08-19 2013-04-17 华南理工大学 一种高取代度乙基纤维素的制备方法
CN102382311B (zh) * 2011-08-19 2013-04-10 华南理工大学 一种高值化利用植物纤维的方法
BR112014008689A2 (pt) 2011-10-19 2017-04-25 Dow Global Technologies Llc medicamento fluível ou ingerível por colher, alimento, ingrediente alimentício ou suplemento alimentar, método para induzir saciedade ou para reduzir reversivelmente o volume vazio do estômago em um indivíduo e método para reduzir a ingestão calórica em um indivíduo
US9757465B2 (en) * 2012-04-11 2017-09-12 Dow Global Technologies Llc Composition comprising an organic diluent and a cellulose ether
US9320799B2 (en) 2012-04-11 2016-04-26 Dow Global Technologies Llc Esterified cellulose ethers having a specific substituent distribution
US9364546B2 (en) 2012-04-11 2016-06-14 Dow Global Technologies Llc Melt-extruded composition comprising a cellulose ether
CN102649820A (zh) * 2012-05-25 2012-08-29 安徽山河药用辅料股份有限公司 一种超低粘羟丙基甲基纤维素醚的制备方法
JP6235584B2 (ja) 2012-07-17 2017-11-22 ダウ グローバル テクノロジーズ エルエルシー 高置換ヒドロキシアルキルメチルセルロースを含む固体分散体
US10730957B2 (en) 2012-08-24 2020-08-04 Dow Global Technologies Llc Process of preparing an esterified cellulose ether in the presence of an alkali metal carboxylate and an aliphatic carboxylic acid
BR112015000073A2 (pt) 2012-08-24 2017-06-27 Dow Global Technologies Llc processo para preparar dois ou mais ésteres de um éter de celulose e processo para preparar um éter de celulose esterificado
KR102138546B1 (ko) 2012-08-24 2020-07-28 다우 글로벌 테크놀로지스 엘엘씨 부분적으로 가교결합된 에스테르화된 셀룰로즈 에테르
US9340624B2 (en) 2012-09-25 2016-05-17 Dow Global Technologies Llc Process for producing cellulose derivatives of high bulk density, good flowability and/or dispersibility in cold water as well as low solution color
KR101586136B1 (ko) 2013-01-09 2016-01-15 신에쓰 가가꾸 고교 가부시끼가이샤 저중합도 셀룰로오스에테르의 제조 방법 및 이에 따라 제조된 셀룰로오스에테르
JP6342990B2 (ja) 2013-04-12 2018-06-13 ダウ グローバル テクノロジーズ エルエルシー メチルセルロースの水溶液を調製するための方法
JP6321779B2 (ja) 2013-04-12 2018-05-09 ダウ グローバル テクノロジーズ エルエルシー 嗜好性が改善された水溶性多糖類
KR20150140825A (ko) 2013-04-12 2015-12-16 다우 글로벌 테크놀로지스 엘엘씨 당류 및 메틸셀룰로스의 수용액의 제조 방법
US9890221B2 (en) 2013-05-14 2018-02-13 Dow Global Technologies Llc Cellulose ethers esterified with dicarboxylic acid
CN105358178B (zh) 2013-07-17 2019-05-31 陶氏环球技术有限责任公司 用于施加到粘膜的包含甲基纤维素的组合物
US9926385B2 (en) * 2013-08-12 2018-03-27 Shin-Etsu Chemical Co., Ltd. Method for producing water-soluble cellulose ether having low degree of polymerization and method for producing film coating composition comprising same
JP6574187B2 (ja) 2014-01-16 2019-09-11 ダウ グローバル テクノロジーズ エルエルシー 付加製造支持材料の回収
US10189748B2 (en) 2014-01-16 2019-01-29 Dow Global Technologies Llc Heat moldable ceramic composition
JP6546179B2 (ja) 2014-01-16 2019-07-17 ダウ グローバル テクノロジーズ エルエルシー ３ｄ印刷用支持材料
US9587268B2 (en) * 2014-01-29 2017-03-07 Agilent Technologies Inc. Fast hybridization for next generation sequencing target enrichment
KR102362913B1 (ko) 2014-02-20 2022-02-17 뉴트리션 ＆ 바이오사이언시즈 유에스에이 1, 엘엘씨 높은 분자량 및 균질성의 신규한 에스테르화된 셀룰로오스 에테르
AR101096A1 (es) 2014-07-16 2016-11-23 Dow Global Technologies Llc Método para el tratamiento de superficies de alimentos con bacteriófagos
AR101098A1 (es) 2014-07-16 2016-11-23 Dow Global Technologies Llc Método para el tratamiento de superficies de alimentos con ácidos antimicrobianos
AR101100A1 (es) 2014-07-16 2016-11-23 Dow Global Technologies Llc Método para el tratamiento de superficies de alimentos con sales de amonio cuaternario
AR101097A1 (es) 2014-07-16 2016-11-23 Dow Global Technologies Llc Método para el tratamiento de superficies de alimentos con ésteres de aminoácidos
JP7044550B2 (ja) 2014-08-27 2022-03-30 ニュートリション アンド バイオサイエンシズ ユーエスエー １，リミティド ライアビリティ カンパニー アセトン不溶性含有量の低いエステル化セルロースエーテル
BR112017008431A2 (pt) * 2014-10-31 2018-01-23 Dow Global Technologies Llc processo para produzir um acetato succinato éter de celulose
JP2017533324A (ja) * 2014-10-31 2017-11-09 ダウ グローバル テクノロジーズ エルエルシー セルロースエーテルのエステルを調製するための方法
CN107074978A (zh) 2014-10-31 2017-08-18 陶氏环球技术有限责任公司 制备纤维素醚的酯的有效方法
CN107428847B (zh) 2015-03-16 2018-11-16 陶氏环球技术有限责任公司 具有低中和度的水溶性酯化纤维素醚
KR20170128355A (ko) 2015-03-16 2017-11-22 다우 글로벌 테크놀로지스 엘엘씨 에스테르화 셀룰로오스 에테르의 겔화
MX2017011091A (es) 2015-03-16 2017-11-10 Dow Global Technologies Llc Proceso para preparar un eter de celulosa esterificado en presencia de un acido carboxilico alifatico.
JP6737810B2 (ja) 2015-05-15 2020-08-12 ダウ グローバル テクノロジーズ エルエルシー 高分子量のエステル化セルロースエーテルを調製するプロセス
BR112017023272A2 (pt) 2015-05-15 2018-08-07 Dow Global Technologies Llc processo para produzir éteres de celulose esterificados de peso molecular muito elevado e baixa viscosidade
WO2016200673A1 (en) 2015-06-09 2016-12-15 Dow Global Technologies Llc Support materials for 3d printing
KR20180056668A (ko) 2015-09-24 2018-05-29 다우 글로벌 테크놀로지스 엘엘씨 아세트산과 반응 촉매의 존재하에서 셀룰로오스 에테르의 에스테르를 제조하기 위한 방법
WO2017223018A1 (en) 2016-06-23 2017-12-28 Dow Global Technologies Llc Esterified cellulose ethers comprising trimellityl groups
WO2017223017A2 (en) 2016-06-23 2017-12-28 Dow Global Technologies Llc Esterified cellulose ethers comprising phthalyl groups
EP3504246B1 (de) 2016-08-23 2020-07-22 Dow Global Technologies LLC Celluloseether-acetat-phthalate
WO2018039214A1 (en) 2016-08-23 2018-03-01 Dow Global Technologies Llc Esterified cellulose ethers comprising maleyl groups
KR102519854B1 (ko) * 2016-10-07 2023-04-10 신에쓰 가가꾸 고교 가부시끼가이샤 히드록시알킬 알킬 셀룰로오스 및 그의 제조 방법, 및 고형 제제
KR102519850B1 (ko) * 2016-10-07 2023-04-10 신에쓰 가가꾸 고교 가부시끼가이샤 히드록시알킬 알킬 셀룰로오스 및 그의 제조 방법, 및 고형 제제
KR20190069446A (ko) 2016-10-18 2019-06-19 다우 글로벌 테크놀로지스 엘엘씨 에스터화된 셀룰로스 에터를 제조하는 효율적인 공정
MX2019013469A (es) * 2017-08-16 2020-02-07 Dow Global Technologies Llc Metodo para la preparacion controlada de eter de celulosa de bajo peso molecular.
CN111344309B (zh) 2017-10-03 2022-04-19 陶氏环球技术有限责任公司 用于制造低粘度纤维素醚的简化方法
WO2020131795A1 (en) 2018-12-18 2020-06-25 DDP Specialty Electronic Materials US, Inc. A sustained release composition comprising a hydroxyalkyl methylcellulose
WO2020131800A1 (en) 2018-12-18 2020-06-25 DDP Specialty Electronic Materials US, Inc. A sustained release composition comprising an ethylcellulose
US20220031623A1 (en) 2018-12-18 2022-02-03 DDP Specialty Electronic Materials US, Inc. A sustained release composition comprising a methylcellulose
EP3897730A1 (de) 2018-12-18 2021-10-27 DDP Specialty Electronic Materials US, Inc. Zusammensetzung mit verzögerter freisetzung mit einer methylcellulose
EP4073167A1 (de) 2019-12-09 2022-10-19 Nutrition & Biosciences USA 1, LLC Zusammensetzung mit einer hochsubstituierten hydroxypropylmethylcellulose und einem zuckeralkohol
JP7414686B2 (ja) 2020-10-22 2024-01-16 信越化学工業株式会社 解重合されたセルロースエーテルの製造方法
JP7414685B2 (ja) * 2020-10-22 2024-01-16 信越化学工業株式会社 解重合されたセルロースエーテルの製造方法
WO2022214591A1 (en) 2021-04-09 2022-10-13 Nutrition & Biosciences Usa 1, Llc A methylcellulose with high powder dissolution temperature
EP4352109A1 (de) 2021-06-08 2024-04-17 Nutrition & Biosciences USA 1, LLC Verfahren zur herstellung von methylcellulose oder hydroxyalkylmethylcellulose
KR20240046783A (ko) 2021-08-26 2024-04-09 뉴트리션 ＆ 바이오사이언시즈 유에스에이 1, 엘엘씨 신규 하이드록시알킬 메틸셀룰로스 및 이의 용도
WO2024006872A1 (en) 2022-06-29 2024-01-04 Dow Global Technologies Llc Method to reduce alkoxy ether release from cellulose ethers

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4841037B1 (de) 1964-10-26 1973-12-04
JPS5163927A (en) * 1974-11-28 1976-06-02 Shinetsu Chemical Co Ketsugoseiryokonajozaihokaizaino seizohoho
US4015067A (en) * 1975-08-18 1977-03-29 The Dow Chemical Company Method of preparing polysaccharide ethers and apparatus
US4048433A (en) * 1976-02-02 1977-09-13 The Procter & Gamble Company Cellulose ethers having a low molecular weight and a high degree of methyl substitution
US4061859A (en) * 1976-06-14 1977-12-06 The Dow Chemical Company Viscosity reduction of cellulose derivatives
DE2967107D1 (en) * 1978-10-24 1984-08-16 Battelle Memorial Institute Process for depolymerising cellulose fibers and depolymerised cellulosic material with a low crystallinity degree obtainable by this process
DE3147434A1 (de) * 1981-11-30 1983-06-09 Hoechst Ag, 6230 Frankfurt Verfahren zur herstellung von celluloseethern mit dimethoxyethan als dispergierhilfsmittel
SE451149B (sv) * 1983-01-26 1987-09-07 Mo Och Domsjoe Ab Apparatur for kontinuerlig behandling av vatteninnehallande lignocellulosamaterial med kveveoxid och syre
DE3316124A1 (de) * 1983-05-03 1984-11-08 Hoechst Ag, 6230 Frankfurt Verfahren zur herstellung von wasserloeslichen cellulosemischethern
JPS6225101A (ja) * 1985-07-24 1987-02-03 Shin Etsu Chem Co Ltd 低重合度セルロ−スエ−テルの製造方法
US4728731A (en) 1986-03-10 1988-03-01 Henkel Kommanditgesellschaft Auf Aktien Reactor and its use in polysaccharide ether production
US5476668A (en) 1990-08-24 1995-12-19 Shin-Etsu Chemical Co., Ltd. Base for film-coating pharmaceuticals and method for preparing same
CA2071488C (en) * 1990-08-24 1996-05-07 Kazuto Kobayashi Base for film-coating pharmaceuticals and method for preparing same
JP3002916B2 (ja) * 1991-10-29 2000-01-24 ダイセル化学工業株式会社 セルロース混合エーテルの製造法
JP2918011B2 (ja) 1993-01-26 1999-07-12 信越化学工業株式会社 低重合度繊維素エーテルの脱色方法
JP3522002B2 (ja) 1995-05-12 2004-04-26 信越化学工業株式会社 低重合度セルロースエーテルの製造方法
JPH09157306A (ja) * 1995-12-06 1997-06-17 Shin Etsu Chem Co Ltd セルロースエーテルの可逆熱応答ゲル及びセルロースエーテルの可逆熱ゲル化応答速度の向上方法
DE19633826C1 (de) * 1996-08-22 1997-10-30 Clariant Gmbh Verfahren zur Herstellung von wasserlöslichen Celluloseethern unter Rückgewinnung von Natriumhydroxid
DE19641781A1 (de) * 1996-10-10 1998-04-16 Clariant Gmbh Verfahren und Vorrichtung zum gleichzeitigen Mahlen und Trocknen eines feuchten Celluloseether enthaltenden Mahlgutes

Also Published As

Publication number Publication date
AU6511799A (en) 2000-06-19
US6261218B1 (en) 2001-07-17
DE69908416T2 (de) 2004-04-01
ES2194520T3 (es) 2003-11-16
JP5117646B2 (ja) 2013-01-16
EP1141029A1 (de) 2001-10-10
WO2000032637A1 (en) 2000-06-08
EP1141029B1 (de) 2003-05-28
AR021436A1 (es) 2002-07-17
ATE241647T1 (de) 2003-06-15
JP2002531594A (ja) 2002-09-24
US20010007028A1 (en) 2001-07-05

Similar Documents

Publication Publication Date Title
ATE241647T1 (de) Verfahren und vorrichtung zur herstellung von celluloseethern
DE69904303T2 (de) Vorrichtung und verfahren zur herstellung von vliesstoffen und laminaten
DE69904106T2 (de) Verfahren und Vorrichtung zur Herstellung von faserverstärkten Strukturen
DE50003914D1 (de) Verfahren und vorrichtung zur herstellung von bürsten sowie danach hergestellte bürsten
ATE232927T1 (de) Verfahren und vorrichtung zur herstellung einer verkürtzten zellulosestruktur
DE59808621D1 (de) Verfahren und Vorrichtung zur Herstellung von gebauten Nockenwellen
DE60002630D1 (de) Verfahren und Vorrichtung zur Herstellung von Verpackungen
ATA129498A (de) Verfahren und vorrichtung zur herstellung cellulosischer formkörper
ATE271625T1 (de) Verfahren und vorrichtung zur herstellung von papiermachergewebe durch extrusion
ATE249547T1 (de) Verfahren und vorrichtung zur herstellung von strukturiertem papier
DE59700973D1 (de) Verfahren und vorrichtung zur herstellung von stanzteilen
DE69711531T2 (de) Verbessertes Verfahren zur Herstellung von Ureum und Vorrichtung dafür
DE69511469D1 (de) Verfahren und Vorrichtung zur Herstellung von Diamanten
DE50006830D1 (de) Verfahren und Vorrichtung zur Herstellung von Bildschirmhologrammen
DE59708645D1 (de) Verfahren und Vorrichtung zur Herstellung von Fibrets aus Zellulosederivaten
DE59908270D1 (de) Verfahren und vorrichtung zur herstellung von bürsten
DE60013451D1 (de) Verfahren und vorrichtung zur herstellung von hochqualitativen einkristallen
DE69613488T2 (de) Verfahren und Vorrichtung zur Herstellung von orientierten Zellulose-Folien
DE69807057D1 (de) Verfahren und Vorrichtung zur Herstellung von Aktivkohle
DE69918240D1 (de) Vorrichtung und verfahren zur tonerzeugung
ATE250336T1 (de) Verfahren und vorrichtung zur herstellung von bienenwaben
DE60025417D1 (de) Verfahren und Vorrichtung zur Herstellung von zweifarbigen Elementen
DE59903178D1 (de) Verfahren und vorrichtung zur herstellung von formkörpern
DE59904329D1 (de) Verfahren und vorrichtung zur herstellung von rohren
DE69819421D1 (de) Verfahren und Vorrichtung zur Herstellung von Argon

Legal Events

Date Code Title Description
8363 Opposition against the patent