CA2128430A1 - Production of Hydrogen Peroxide - Google Patents
Production of Hydrogen PeroxideInfo
- Publication number
- CA2128430A1 CA2128430A1 CA 2128430 CA2128430A CA2128430A1 CA 2128430 A1 CA2128430 A1 CA 2128430A1 CA 2128430 CA2128430 CA 2128430 CA 2128430 A CA2128430 A CA 2128430A CA 2128430 A1 CA2128430 A1 CA 2128430A1
- Authority
- CA
- Canada
- Prior art keywords
- hydrogen peroxide
- catalyst
- source
- production
- fluorinated carbon
- 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.)
- Granted
Links
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 title abstract 5
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 239000003054 catalyst Substances 0.000 abstract 3
- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical compound C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 1
- 230000002378 acidificating effect Effects 0.000 abstract 1
- 239000012736 aqueous medium Substances 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- -1 fluoride ions Chemical class 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 abstract 1
- 230000002209 hydrophobic effect Effects 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 239000012429 reaction media Substances 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- 239000011734 sodium Substances 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B15/00—Peroxides; Peroxyhydrates; Peroxyacids or salts thereof; Superoxides; Ozonides
- C01B15/01—Hydrogen peroxide
- C01B15/029—Preparation from hydrogen and oxygen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
-
- B01J35/23—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0211—Impregnation using a colloidal suspension
Abstract
The invention a relates to hydrogen peroxide manufacture, and catalyst therefor, by direct oxidation of hydrogen with oxygen in an acidic aqueous medium. The catalyst includes a Group VIII metal on a partially hydrophobic, partially hydrophilic support, such as Pd on fluorinated carbon. Improvements in H2O2 selectivity and catalyst stability are achieved by adding a source of sodium and chloride ions to the reaction medium and, in the case of a fluorinated carbon support, adding a source of fluoride ions.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/823,688 US5338531A (en) | 1992-01-21 | 1992-01-21 | Production of hydrogen peroxide |
US07/823,688 | 1992-01-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2128430A1 true CA2128430A1 (en) | 1993-07-22 |
CA2128430C CA2128430C (en) | 1998-10-27 |
Family
ID=25239423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002128430A Expired - Fee Related CA2128430C (en) | 1992-01-21 | 1993-01-21 | Production of hydrogen peroxide |
Country Status (16)
Country | Link |
---|---|
US (3) | US5338531A (en) |
EP (1) | EP0623095A1 (en) |
JP (1) | JP3375628B2 (en) |
KR (2) | KR940703780A (en) |
AU (1) | AU670058B2 (en) |
BR (1) | BR9305762A (en) |
CA (1) | CA2128430C (en) |
CZ (1) | CZ173794A3 (en) |
FI (1) | FI111708B (en) |
HU (1) | HU215565B (en) |
NO (1) | NO313091B1 (en) |
NZ (1) | NZ246548A (en) |
RO (1) | RO111175B1 (en) |
SK (1) | SK281953B6 (en) |
UA (1) | UA26158C2 (en) |
WO (1) | WO1993014025A1 (en) |
Families Citing this family (65)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5338531A (en) * | 1992-01-21 | 1994-08-16 | Chuang Karl T | Production of hydrogen peroxide |
CA2122881A1 (en) * | 1993-05-06 | 1994-11-07 | Michiya Kawakami | Process for producing hydrogen peroxide |
SE9600884L (en) * | 1996-03-07 | 1997-09-08 | Bengtsson Erik Process Design | Process for the preparation of hydrogen peroxide by direct synthesis between hydrogen and oxygen in contact with a catalyst in a solvent |
SE9600885L (en) * | 1996-03-07 | 1997-09-08 | Bengtsson Erik Process Design | Process for producing hydrogen peroxide by direct synthesis between hydrogen and oxygen in contact with catalyst |
SE9602484D0 (en) * | 1996-06-24 | 1996-06-24 | Eka Chemicals Ab | Method of producing a chemical compound |
DE19642770A1 (en) * | 1996-10-16 | 1998-04-23 | Basf Ag | Process for the production of hydrogen peroxide |
CN1116223C (en) | 1997-12-22 | 2003-07-30 | 阿克佐诺贝尔公司 | Process for production of hydragen peroxide |
US6576214B2 (en) * | 2000-12-08 | 2003-06-10 | Hydrocarbon Technologies, Inc. | Catalytic direct production of hydrogen peroxide from hydrogen and oxygen feeds |
US6168775B1 (en) * | 1998-08-26 | 2001-01-02 | Hydrocarbon Technologies, Inc. | Catalyst and process for direct catalystic production of hydrogen peroxide, (H2O2) |
US6346228B1 (en) * | 1999-02-19 | 2002-02-12 | Council Of Scientific And Industrial Research | Hydrophobic multicomponent catalyst useful for direct oxidation of hydrogen to hydrogen peroxide |
IT1318550B1 (en) | 2000-06-01 | 2003-08-27 | Eni Spa | CATALYST AND PROCESS FOR DIRECT SYNTHESIS OF OXYGEN WATER. |
US6448199B1 (en) | 2000-09-05 | 2002-09-10 | Council Of Scientific & Industrial Research | Hydrophobic composite Pd-membrane catalyst useful for non-hazardous direct oxidation of hydrogen by oxygen to hydrogen peroxide and method of its preparation |
US6432376B1 (en) | 2000-09-05 | 2002-08-13 | Council Of Scientific & Industrial Research | Membrane process for the production of hydrogen peroxide by non-hazardous direct oxidation of hydrogen by oxygen using a novel hydrophobic composite Pd-membrane catalyst |
DE10048844A1 (en) * | 2000-10-02 | 2002-04-11 | Basf Ag | Process for the production of platinum metal catalysts |
KR100383218B1 (en) * | 2000-10-26 | 2003-05-12 | 한국화학연구원 | Direct manufacturing method of hydrogen peroxide |
US6534440B2 (en) * | 2000-11-29 | 2003-03-18 | Council Of Scientific And Industrial Research | Process for the activation of a metallic palladium based catalyst useful for the direct oxidation of hydrogen to hydrogen peroxide |
US7115192B1 (en) | 2001-05-07 | 2006-10-03 | Uop Llc | Apparatus and process for the synthesis of hydrogen peroxide directly from hydrogen and oxygen |
US20060131161A1 (en) * | 2001-05-07 | 2006-06-22 | Towler Gavin P | Air sanitation with hydrogen peroxide |
JP2003050068A (en) * | 2001-05-30 | 2003-02-21 | Permelec Electrode Ltd | Ice composition containing hydrogen peroxide, and method of preserving perishable food |
US6768013B1 (en) | 2001-06-15 | 2004-07-27 | Uop Llc | Intrinsically safe oxidation process |
DE10153546A1 (en) * | 2001-10-30 | 2003-05-22 | Degussa | Direct synthesis of hydrogen peroxide and its integration in oxidation processes |
EP1344747B1 (en) * | 2002-03-14 | 2012-02-08 | Repsol Quimica S.A. | Process to obtain hydrogen peroxide |
ATE453603T1 (en) * | 2003-02-03 | 2010-01-15 | Repsol Quimica Sa | INTEGRATED PROCESS FOR THE SELECTIVE OXYDATION OF ORGANIC COMPOUNDS |
US20060102492A1 (en) * | 2003-02-19 | 2006-05-18 | Corradi Jason T | In situ generation of hydrogen peroxide |
US7067103B2 (en) * | 2003-03-28 | 2006-06-27 | Headwaters Nanokinetix, Inc. | Direct hydrogen peroxide production using staged hydrogen addition |
US7192562B1 (en) | 2003-04-17 | 2007-03-20 | Uop Llc | Hydrogen-oxygen mixer-sparger |
US7442350B1 (en) * | 2003-04-17 | 2008-10-28 | Uop Llc | Plate design for mixer sparger |
US7569508B2 (en) * | 2004-11-17 | 2009-08-04 | Headwaters Technology Innovation, Llc | Reforming nanocatalysts and method of making and using such catalysts |
US7045479B2 (en) * | 2003-07-14 | 2006-05-16 | Headwaters Nanokinetix, Inc. | Intermediate precursor compositions used to make supported catalysts having a controlled coordination structure and methods for preparing such compositions |
US7655137B2 (en) | 2003-07-14 | 2010-02-02 | Headwaters Technology Innovation, Llc | Reforming catalysts having a controlled coordination structure and methods for preparing such compositions |
US7011807B2 (en) * | 2003-07-14 | 2006-03-14 | Headwaters Nanokinetix, Inc. | Supported catalysts having a controlled coordination structure and methods for preparing such catalysts |
US7144565B2 (en) * | 2003-07-29 | 2006-12-05 | Headwaters Nanokinetix, Inc. | Process for direct catalytic hydrogen peroxide production |
US20050201925A1 (en) * | 2004-03-09 | 2005-09-15 | Bi Le-Khac | Process for making hydrogen peroxide |
US7632775B2 (en) * | 2004-11-17 | 2009-12-15 | Headwaters Technology Innovation, Llc | Multicomponent nanoparticles formed using a dispersing agent |
US7449423B2 (en) * | 2005-01-14 | 2008-11-11 | Headwaters Technology Innovation, Llc | Heat treatment of anchored nanocatalysts in a non-zero oxidation state and catalysts made by such method |
US7803201B2 (en) * | 2005-02-09 | 2010-09-28 | Headwaters Technology Innovation, Llc | Organically complexed nanocatalysts for improving combustion properties of fuels and fuel compositions incorporating such catalysts |
US7856992B2 (en) | 2005-02-09 | 2010-12-28 | Headwaters Technology Innovation, Llc | Tobacco catalyst and methods for reducing the amount of undesirable small molecules in tobacco smoke |
US7045481B1 (en) | 2005-04-12 | 2006-05-16 | Headwaters Nanokinetix, Inc. | Nanocatalyst anchored onto acid functionalized solid support and methods of making and using same |
US7357903B2 (en) * | 2005-04-12 | 2008-04-15 | Headwaters Heavy Oil, Llc | Method for reducing NOx during combustion of coal in a burner |
US7326399B2 (en) * | 2005-04-15 | 2008-02-05 | Headwaters Technology Innovation, Llc | Titanium dioxide nanoparticles and nanoparticle suspensions and methods of making the same |
US20060258875A1 (en) * | 2005-05-10 | 2006-11-16 | Clementine Reyes | Methods for manufacturing supported nanocatalysts and methods for using supported nanocatalysts |
US7396795B2 (en) * | 2005-08-31 | 2008-07-08 | Headwaters Technology Innovation, Llc | Low temperature preparation of supported nanoparticle catalysts having increased dispersion |
US7288500B2 (en) | 2005-08-31 | 2007-10-30 | Headwaters Technology Innovation, Llc | Selective hydrogenation of nitro groups of halonitro aromatic compounds |
US7892299B2 (en) * | 2005-09-15 | 2011-02-22 | Headwaters Technology Innovation, Llc | Methods of manufacturing fuel cell electrodes incorporating highly dispersed nanoparticle catalysts |
US7935652B2 (en) * | 2005-09-15 | 2011-05-03 | Headwaters Technology Innovation, Llc. | Supported nanoparticle catalysts manufactured using caged catalyst atoms |
JP4709954B2 (en) * | 2005-09-21 | 2011-06-29 | 田中貴金属工業株式会社 | Direct synthesis of hydrogen peroxide |
US7718158B2 (en) * | 2005-10-13 | 2010-05-18 | Lyondell Chemical Technology, L.P. | Polymer-encapsulated ion-exchange resin |
US7528269B2 (en) * | 2005-12-20 | 2009-05-05 | Lyondell Chemical Technology, L.P. | Process for oxidizing organic compounds |
US7758660B2 (en) * | 2006-02-09 | 2010-07-20 | Headwaters Technology Innovation, Llc | Crystalline nanocatalysts for improving combustion properties of fuels and fuel compositions incorporating such catalysts |
US7718710B2 (en) * | 2006-03-17 | 2010-05-18 | Headwaters Technology Innovation, Llc | Stable concentrated metal colloids and methods of making same |
US7514476B2 (en) * | 2006-03-17 | 2009-04-07 | Headwaters Technology Innovation, Llc | Stable concentrated metal colloids and methods of making same |
US7632774B2 (en) * | 2006-03-30 | 2009-12-15 | Headwaters Technology Innovation, Llc | Method for manufacturing supported nanocatalysts having an acid-functionalized support |
US7541309B2 (en) * | 2006-05-16 | 2009-06-02 | Headwaters Technology Innovation, Llc | Reforming nanocatalysts and methods of making and using such catalysts |
US7604719B2 (en) * | 2006-05-25 | 2009-10-20 | Uop Llc | In situ generation of hydrogen peroxide |
US7357909B2 (en) * | 2006-06-28 | 2008-04-15 | Lyondell Chemical Technology, L.P. | Process for producing hydrogen peroxide |
US7563742B2 (en) | 2006-09-22 | 2009-07-21 | Headwaters Technology Innovation, Llc | Supported nickel catalysts having high nickel loading and high metal dispersion and methods of making same |
US7601668B2 (en) | 2006-09-29 | 2009-10-13 | Headwaters Technology Innovation, Llc | Methods for manufacturing bi-metallic catalysts having a controlled crystal face exposure |
US7534741B2 (en) * | 2007-02-09 | 2009-05-19 | Headwaters Technology Innovation, Llc | Supported nanocatalyst particles manufactured by heating complexed catalyst atoms |
EP2000205A1 (en) * | 2007-06-01 | 2008-12-10 | Repsol Ypf S.A. | Process to obtain hydrogen peroxide |
US7501532B1 (en) | 2007-11-20 | 2009-03-10 | Lyondell Chemical Technology, L.P. | Process for producing hydrogen peroxide |
CN101850272B (en) * | 2010-06-22 | 2011-12-14 | 中国工程物理研究院核物理与化学研究所 | Method for preparing hydrophobic catalyst by freezing molding |
US9610573B2 (en) | 2011-07-15 | 2017-04-04 | Solvay Sa | Process to obtain hydrogen peroxide, and catalyst supports for the same process |
WO2015124533A1 (en) * | 2014-02-21 | 2015-08-27 | Solvay Sa | Process to obtain hydrogen peroxide, and catalyst and catalysts supports for said process |
SI25590A (en) | 2018-01-15 | 2019-07-31 | Univerza V Ljubljani | Process for preparation of isotope labeled hydrogen peroxide |
WO2020138800A1 (en) * | 2018-12-26 | 2020-07-02 | 코오롱인더스트리 주식회사 | Catalyst, method for producing same, electrode comprising same, membrane-electrode assembly comprising same, and fuel cell comprising same |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS514097A (en) * | 1974-07-02 | 1976-01-13 | Tokuyama Soda Kk | Kasankasuisono seizohoho |
US4681751A (en) * | 1983-06-22 | 1987-07-21 | E. I. Du Pont De Nemours And Company | Catalytic process for making H2 O2 from hydrogen and oxygen |
EP0132294B1 (en) * | 1983-06-22 | 1987-03-11 | E.I. Du Pont De Nemours And Company | Catalytic process for making h2o2 from hydrogen and oxygen |
US4661337A (en) * | 1985-11-18 | 1987-04-28 | The Halcon Sd Group, Inc. | Preparation of hydrogen peroxide |
US4908198A (en) * | 1986-06-02 | 1990-03-13 | The Electrosynthesis Company, Inc. | Fluorinated carbons and methods of manufacture |
US4772458A (en) * | 1986-11-19 | 1988-09-20 | E. I. Du Pont De Nemours And Company | Catalytic process for making hydrogen peroxide from hydrogen and oxygen employing a bromide promoter |
CA1317740C (en) * | 1988-10-24 | 1993-05-18 | Karl T. Chuang | Production of hydrogen peroxide |
US5132099A (en) * | 1990-12-27 | 1992-07-21 | Mitsubishi Gas Chemical Company, Inc. | Method for producing hydrogen peroxide |
US5135731A (en) * | 1991-05-15 | 1992-08-04 | E. I. Du Pont De Nemours And Company | Method for catalytic production of hydrogen peroxide |
US5338531A (en) * | 1992-01-21 | 1994-08-16 | Chuang Karl T | Production of hydrogen peroxide |
-
1992
- 1992-01-21 US US07/823,688 patent/US5338531A/en not_active Expired - Lifetime
-
1993
- 1993-01-21 CZ CZ941737A patent/CZ173794A3/en unknown
- 1993-01-21 CA CA002128430A patent/CA2128430C/en not_active Expired - Fee Related
- 1993-01-21 RO RO94-01187A patent/RO111175B1/en unknown
- 1993-01-21 EP EP93902010A patent/EP0623095A1/en not_active Ceased
- 1993-01-21 BR BR9305762A patent/BR9305762A/en not_active IP Right Cessation
- 1993-01-21 NZ NZ246548A patent/NZ246548A/en not_active IP Right Cessation
- 1993-01-21 WO PCT/CA1993/000027 patent/WO1993014025A1/en active IP Right Grant
- 1993-01-21 KR KR1019940702472A patent/KR940703780A/en not_active IP Right Cessation
- 1993-01-21 HU HU9402151A patent/HU215565B/en not_active IP Right Cessation
- 1993-01-21 JP JP51204493A patent/JP3375628B2/en not_active Expired - Fee Related
- 1993-01-21 UA UA94075647A patent/UA26158C2/en unknown
- 1993-01-21 SK SK882-94A patent/SK281953B6/en unknown
- 1993-01-21 KR KR1019940702472A patent/KR0118992B1/en active
- 1993-01-21 AU AU33423/93A patent/AU670058B2/en not_active Ceased
-
1994
- 1994-07-15 FI FI943377A patent/FI111708B/en active
- 1994-07-20 NO NO19942714A patent/NO313091B1/en unknown
-
1997
- 1997-04-24 US US08/845,571 patent/US5846898A/en not_active Expired - Fee Related
-
1998
- 1998-10-28 US US09/182,587 patent/US5925588A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0623095A1 (en) | 1994-11-09 |
BR9305762A (en) | 1997-01-28 |
HUT69291A (en) | 1995-09-28 |
WO1993014025A1 (en) | 1993-07-22 |
SK88294A3 (en) | 1995-01-12 |
FI943377A (en) | 1994-07-15 |
CA2128430C (en) | 1998-10-27 |
FI943377A0 (en) | 1994-07-15 |
NO942714L (en) | 1994-07-20 |
HU9402151D0 (en) | 1994-09-28 |
NZ246548A (en) | 1995-09-26 |
US5925588A (en) | 1999-07-20 |
KR940703780A (en) | 1994-12-12 |
AU670058B2 (en) | 1996-07-04 |
SK281953B6 (en) | 2001-09-11 |
FI111708B (en) | 2003-09-15 |
JPH07503447A (en) | 1995-04-13 |
US5846898A (en) | 1998-12-08 |
US5338531A (en) | 1994-08-16 |
NO313091B1 (en) | 2002-08-12 |
JP3375628B2 (en) | 2003-02-10 |
AU3342393A (en) | 1993-08-03 |
KR0118992B1 (en) | 1997-09-30 |
HU215565B (en) | 1999-01-28 |
UA26158C2 (en) | 1999-06-07 |
CZ173794A3 (en) | 1995-08-16 |
NO942714D0 (en) | 1994-07-20 |
RO111175B1 (en) | 1996-07-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |