DE1817983C2 - Mittel zur feuerungsseitigen Heizkesselreinigung durch Absprengung der Verbrennungsrückstände - Google Patents
Mittel zur feuerungsseitigen Heizkesselreinigung durch Absprengung der VerbrennungsrückständeInfo
- Publication number
- DE1817983C2 DE1817983C2 DE1817983A DE1817983A DE1817983C2 DE 1817983 C2 DE1817983 C2 DE 1817983C2 DE 1817983 A DE1817983 A DE 1817983A DE 1817983 A DE1817983 A DE 1817983A DE 1817983 C2 DE1817983 C2 DE 1817983C2
- Authority
- DE
- Germany
- Prior art keywords
- boiler
- cleaning
- gas
- ammonium
- agent
- 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
Links
- 238000004140 cleaning Methods 0.000 title claims description 16
- 238000002485 combustion reaction Methods 0.000 title claims description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 14
- 229910021529 ammonia Inorganic materials 0.000 claims description 13
- 150000001875 compounds Chemical class 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 3
- 239000004071 soot Substances 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims 1
- 239000012895 dilution Substances 0.000 claims 1
- 238000010790 dilution Methods 0.000 claims 1
- 239000003112 inhibitor Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 description 17
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 16
- 239000000126 substance Substances 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 229910001868 water Inorganic materials 0.000 description 12
- 239000002253 acid Substances 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000002378 acidificating effect Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 239000001099 ammonium carbonate Substances 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 3
- 239000004254 Ammonium phosphate Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 235000012501 ammonium carbonate Nutrition 0.000 description 3
- VBIXEXWLHSRNKB-UHFFFAOYSA-N ammonium oxalate Chemical compound [NH4+].[NH4+].[O-]C(=O)C([O-])=O VBIXEXWLHSRNKB-UHFFFAOYSA-N 0.000 description 3
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 3
- 235000019289 ammonium phosphates Nutrition 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 239000012459 cleaning agent Substances 0.000 description 3
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 235000006408 oxalic acid Nutrition 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- PMJNEQWWZRSFCE-UHFFFAOYSA-N 3-ethoxy-3-oxo-2-(thiophen-2-ylmethyl)propanoic acid Chemical compound CCOC(=O)C(C(O)=O)CC1=CC=CS1 PMJNEQWWZRSFCE-UHFFFAOYSA-N 0.000 description 1
- -1 Alkyl phenol Chemical compound 0.000 description 1
- 239000004156 Azodicarbonamide Substances 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 1
- VZTDIZULWFCMLS-UHFFFAOYSA-N ammonium formate Chemical compound [NH4+].[O-]C=O VZTDIZULWFCMLS-UHFFFAOYSA-N 0.000 description 1
- CAMXVZOXBADHNJ-UHFFFAOYSA-N ammonium nitrite Chemical compound [NH4+].[O-]N=O CAMXVZOXBADHNJ-UHFFFAOYSA-N 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 1
- 235000019399 azodicarbonamide Nutrition 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- HFNQLYDPNAZRCH-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O.OC(O)=O HFNQLYDPNAZRCH-UHFFFAOYSA-N 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052806 inorganic carbonate Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 229920000151 polyglycol Polymers 0.000 description 1
- 239000010695 polyglycol Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-N sodium;hydron;carbonate Chemical compound [Na+].OC(O)=O UIIMBOGNXHQVGW-UHFFFAOYSA-N 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 1
- 235000019801 trisodium phosphate Nutrition 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/0005—Other compounding ingredients characterised by their effect
- C11D3/0052—Gas evolving or heat producing compositions
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Detergent Compositions (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT1064867A AT282778B (de) | 1967-11-24 | 1967-11-24 | Mittel zur feuerungsseitigen Reinigung von Heizkesseln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE1817983A1 DE1817983A1 (de) | 1976-06-24 |
| DE1817983C2 true DE1817983C2 (de) | 1982-03-11 |
Family
ID=3623766
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1817983A Expired DE1817983C2 (de) | 1967-11-24 | 1968-11-22 | Mittel zur feuerungsseitigen Heizkesselreinigung durch Absprengung der Verbrennungsrückstände |
| DE19681817769 Pending DE1817769A1 (de) | 1967-11-24 | 1968-11-22 | Mittel zur feuerungsseitigen Reinigung von Heizkesseln |
| DE1817798A Expired DE1817798C3 (de) | 1967-11-24 | 1968-11-22 | Mittel zur feuerungsseitigen Reinigung von Heizkesseln |
| DE1810424A Expired DE1810424C3 (de) | 1967-11-24 | 1968-11-22 | Verfahren zur feuerungsseitigen Reinigung von Heizkesseln |
Family Applications After (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19681817769 Pending DE1817769A1 (de) | 1967-11-24 | 1968-11-22 | Mittel zur feuerungsseitigen Reinigung von Heizkesseln |
| DE1817798A Expired DE1817798C3 (de) | 1967-11-24 | 1968-11-22 | Mittel zur feuerungsseitigen Reinigung von Heizkesseln |
| DE1810424A Expired DE1810424C3 (de) | 1967-11-24 | 1968-11-22 | Verfahren zur feuerungsseitigen Reinigung von Heizkesseln |
Country Status (13)
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK127378A (da) | 1977-03-28 | 1978-09-29 | Saarberg Hoelter | Fremgangsmaade til forhindring af belaegninger paa overflader som er i kontakt med vandige vaesker indeholdende til udkrystallisation tilboejelige stoffer |
| DE2807329A1 (de) * | 1978-02-21 | 1979-08-23 | Boehringer Sohn Ingelheim | Mittel und verfahren zur feuerungsseitigen reinigung von heizanlagen auf schaumbasis |
| SE437032B (sv) * | 1981-05-20 | 1985-02-04 | Dalf International Ab | Forfarande och anordning for losgorande och avlegsnande av fasta beleggningar pa ytorna i en verme- eller angpanna |
| GB2124643B (en) * | 1982-08-03 | 1986-03-12 | Fishlock Lomax Eric Graham | Method of cleaning chimneys and the like |
| DK0451434T3 (da) * | 1990-04-13 | 1994-12-05 | Grace Dearborn N V | Fremgangsmåde til regulering af aflejninger og korrosion i vandbehandlingssystemer |
| GB0207876D0 (en) * | 2002-04-05 | 2002-05-15 | British Nuclear Fuels Plc | Removal of blockages from pipework |
| ES2286394T3 (es) * | 2003-10-30 | 2007-12-01 | Ctp Environnement | Procedimiento de limpieza en marcha de las superficies de intercambio termico de hornos. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE518666A (enrdf_load_stackoverflow) * | ||||
| US2419076A (en) | 1944-03-06 | 1947-04-15 | Shell Dev | Removal of carbonaceous deposits |
| CH360072A (de) | 1960-11-08 | 1962-02-15 | Mettauer Hans | Einrichtung zur Kesselreinigung |
-
0
- NL NL132465D patent/NL132465C/xx active
-
1967
- 1967-11-24 AT AT1064867A patent/AT282778B/de not_active IP Right Cessation
-
1968
- 1968-05-03 CH CH656368A patent/CH502433A/de not_active IP Right Cessation
- 1968-05-16 LU LU56096D patent/LU56096A1/xx unknown
- 1968-06-13 FI FI1653/68A patent/FI53831C/fi active
- 1968-06-14 NL NL6808440A patent/NL6808440A/xx unknown
- 1968-07-31 FR FR1573794D patent/FR1573794A/fr not_active Expired
- 1968-07-31 BE BE718849D patent/BE718849A/xx not_active IP Right Cessation
- 1968-11-12 DK DK549468AA patent/DK122969B/da not_active IP Right Cessation
- 1968-11-22 IE IE1426/68A patent/IE32925B1/xx unknown
- 1968-11-22 DE DE1817983A patent/DE1817983C2/de not_active Expired
- 1968-11-22 DE DE19681817769 patent/DE1817769A1/de active Pending
- 1968-11-22 SE SE6815933A patent/SE373875C/xx unknown
- 1968-11-22 NO NO4649/68A patent/NO121760B/no unknown
- 1968-11-22 DE DE1817798A patent/DE1817798C3/de not_active Expired
- 1968-11-22 DE DE1810424A patent/DE1810424C3/de not_active Expired
- 1968-11-25 GB GB1250357D patent/GB1250357A/en not_active Expired
-
1974
- 1974-06-19 SE SE7408139A patent/SE415273B/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE718849A (enrdf_load_stackoverflow) | 1969-01-31 |
| DE1817798C3 (de) | 1982-05-19 |
| DE1810424B2 (de) | 1971-05-27 |
| LU56096A1 (enrdf_load_stackoverflow) | 1968-09-09 |
| IE32925B1 (en) | 1974-01-23 |
| DE1810424A1 (de) | 1969-08-21 |
| DK122969B (da) | 1972-05-01 |
| GB1250357A (enrdf_load_stackoverflow) | 1971-10-20 |
| FR1573794A (enrdf_load_stackoverflow) | 1969-07-04 |
| FI53831C (fi) | 1978-08-10 |
| SE373875B (enrdf_load_stackoverflow) | 1975-02-17 |
| NL132465C (enrdf_load_stackoverflow) | |
| DE1817798B2 (de) | 1976-06-16 |
| AT282778B (de) | 1970-07-10 |
| DE1817983A1 (de) | 1976-06-24 |
| SE373875C (sv) | 1976-09-27 |
| CH502433A (de) | 1971-01-31 |
| FI53831B (fi) | 1978-05-02 |
| SE7408139L (enrdf_load_stackoverflow) | 1974-06-19 |
| SE415273B (sv) | 1980-09-22 |
| IE32925L (en) | 1969-05-24 |
| NO121760B (enrdf_load_stackoverflow) | 1971-04-05 |
| NL6808440A (enrdf_load_stackoverflow) | 1969-05-28 |
| DE1817798A1 (de) | 1972-01-05 |
| DE1810424C3 (de) | 1979-11-22 |
| DE1817769A1 (de) | 1971-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AC | Divided out of |
Ref country code: DE Ref document number: 1817798 Format of ref document f/p: P |
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| D2 | Grant after examination |