CH636148A5 - METHOD AND SYSTEM FOR REPROCESSING WASTE PAPER. - Google Patents
METHOD AND SYSTEM FOR REPROCESSING WASTE PAPER. Download PDFInfo
- Publication number
- CH636148A5 CH636148A5 CH198779A CH198779A CH636148A5 CH 636148 A5 CH636148 A5 CH 636148A5 CH 198779 A CH198779 A CH 198779A CH 198779 A CH198779 A CH 198779A CH 636148 A5 CH636148 A5 CH 636148A5
- Authority
- CH
- Switzerland
- Prior art keywords
- flotation device
- secondary circuit
- reaction tower
- pulper
- flotation
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 21
- 239000010893 paper waste Substances 0.000 title claims description 5
- 238000012958 reprocessing Methods 0.000 title claims description 4
- 238000005188 flotation Methods 0.000 claims description 35
- 239000000126 substance Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002761 deinking Substances 0.000 claims description 12
- 239000006260 foam Substances 0.000 claims description 9
- 230000008719 thickening Effects 0.000 claims description 8
- 239000010865 sewage Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 238000010790 dilution Methods 0.000 claims description 5
- 239000012895 dilution Substances 0.000 claims description 5
- 239000002562 thickening agent Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000976 ink Substances 0.000 description 9
- 238000004061 bleaching Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Physical Water Treatments (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Wiederaufbereiten von Altpapier, mit einer Grobauflösung in einem Stofflöser, einer Vorsortierung, einer Eindickung auf Stoffdichten von über 10%, einer Behandlung in einem Reaktionsturm in Anwesenheit von Deinking-Chemikalien, einer anschliessenden Verdünnung der Suspension und Flotierung in einer Flotationsvorrichtung. The invention relates to a process for the reprocessing of waste paper, with a coarse dissolution in a pulper, a pre-sorting, a thickening to fabric densities of over 10%, a treatment in a reaction tower in the presence of deinking chemicals, a subsequent dilution of the suspension and flotation in one Flotation device.
Ein derartiges Verfahren ist z. B. in der DE-OS 2 311 674 beschrieben. Die Deinking-Chemikalien werden dabei kurz vor dem Reaktionsturm bzw. dem Bleichturm in den Prozess eingeleitet. In den Stofflöser werden lediglich Chemikalien als Komplexbildner eingebracht. Mit diesem Verfahren wird zwar eine relativ hohe Weisse des neu zu bildenden Papiers erreicht, aber das allgemeine Bestreben geht auf immer höhere Weissegrade. Such a method is e.g. B. described in DE-OS 2 311 674. The deinking chemicals are introduced into the process shortly before the reaction tower or the bleaching tower. Only chemicals are introduced into the pulper as complexing agents. With this process, a relatively high whiteness of the paper to be newly formed is achieved, but the general effort is towards ever higher degrees of whiteness.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zum Wiederaufbereiten von Altpapier zu schaffen, mit dem ohne wesentlichen grösseren Aufwand eine höhere Weisse erzielt werden kann. The present invention is therefore based on the object of providing a method for the reprocessing of waste paper by means of which a higher whiteness can be achieved without significantly greater outlay.
Diese Aufgabe wird erfindungsgemäss dadurch gelöst, According to the invention, this object is achieved by
dass zumindest ein Teil der Deinking-Chemikalien bereits in den Stofflöser eingebracht wird und dass das vor dem Reaktionsturm bei der Eindickung anfallende mit Druckfarben beladene Wasser in einer Nebenkreis-Flotationsvorrichtung flotiert und das dabei gewonnene Klärwasser wieder in den Aufbereitungsprozess zurückgeleitet wird. that at least some of the deinking chemicals have already been introduced into the pulper and that the water loaded with printing inks before the reaction tower during the thickening floats in a secondary circuit flotation device and the sewage water obtained in this way is returned to the treatment process.
Es wurde nämlich festgestellt, dass eine höhere Weisse erzielt wird, wenn bereits in den Stofflöser Deinking-Chemi-kalien eingebracht werden. Durch diese Massnahme setzt somit die Druckfarbenablösung bereits im Stofflöser und nicht erst im Reaktionsturm ein. Die Folge davon ist jedoch, dass das bei der Eindickung vor dem Reaktionsturm anfallende Eindickerwasser einen sehr starken Anteil an Druckfarbe aufweist. Dies würde dazu führen, dass die Suspension immer mehr mit Druckfarbe angereichert wird, da das Wasser zur Einsparung im Kreislauf geführt wird. Dadurch würde die Gefahr bestehen, dass Schmutzfarben in die Fasern wieder eingerieben werden, die Eindickungsvorrich-tung verdreckt und es zu Störungen im Aufbereitungsprozess kommt. It was found that a higher whiteness is achieved if deinking chemicals are already introduced into the pulper. As a result of this measure, the ink detachment begins already in the fabric dissolver and not only in the reaction tower. The consequence of this, however, is that the thickener water obtained during the thickening in front of the reaction tower has a very high proportion of printing ink. This would lead to the suspension being increasingly enriched with printing ink, since the water is circulated to save. As a result, there would be a risk that dirt colors would be rubbed into the fibers again, the thickening device would become dirty, and there would be disruptions in the preparation process.
Durch die erfindungsgemässe Anordnung einer zusätzlichen Flotationsvorrichtung in dem Nebenkreis werden nun die bereits abgelösten Druckfarbeteilchen entfernt, so dass sich dieser Kreislauf nicht anreichern kann. Durch das erfindungsgemässe Verfahren wird auf diese Weise ohne besonderen Aufwand eine höhere Weisse erhalten. Der in der Nebenkreis-Flotation abgeschiedene Schmutz, insbesondere die Druckfarbeteilchen, stellen keinen Ballast mehr für den Reaktionsturm dar und gelangen so auch nicht mehr in die Flotationsvorrichtung im Hauptkreis. Dadurch kann die Zellenzahl dieser Flotationsvorrichtung verringert werden, so dass die Gesamtzahl der Flotationszellen aus Haupt- und Nebenkreis nicht höher liegen muss. Dadurch, dass die Druckfarbeteilchen in konzentrierter Form in der Nebenkreis-Flotationsvorrichtung anfallen, wird die Wirksamkeit der Flotation sogar noch gesteigert, wodurch zusätzlich eine höhere Weisse oder eine Chemikalieneinsparung erzielt werden kann. The arrangement of an additional flotation device in the secondary circuit according to the invention now removes the already detached ink particles, so that this circuit cannot accumulate. A higher whiteness is obtained in this way by the method according to the invention without any special effort. The dirt separated in the secondary circuit flotation, in particular the printing ink particles, no longer constitute ballast for the reaction tower and thus no longer reach the flotation device in the main circuit. As a result, the number of cells in this flotation device can be reduced, so that the total number of flotation cells from the main and secondary circuit need not be higher. The fact that the ink particles are obtained in a concentrated form in the secondary circuit flotation device increases the effectiveness of the flotation even more, as a result of which a higher whiteness or chemical savings can also be achieved.
In Weiterbildung des erfindungsgemässen Verfahrens ist vorgesehen, dass der Schaum der nach dem Reaktionsturm angeordneten Flotationsvorrichtung zur Nachbehandlung in die Nebenkreis-Flotationsvorrichtung eingeleitet wird. In a further development of the method according to the invention, it is provided that the foam of the flotation device arranged after the reaction tower is introduced into the secondary circuit flotation device for after-treatment.
Durch diese Massnahmen erfolgt eine sehr gute Ausnutzung der Flotationsvorrichtungen. These measures make very good use of the flotation devices.
Eine erfindungsgemässe Anlage zur Durchführung des Verfahrens mit einem Stofflöser, einer Reinigungsvorrichtung, einem Eindicker, einer Zufuhrleitung für Deinking-Chemikalien, einem Reaktionsturm mit einer Verdünnungszone im unteren Bereich und mit einer nachgeschalteten Flotationsvorrichtung besteht darin, dass die Anlage mit einer weiteren, in den Stofflöser mündenden Zufuhrleitung für Deinking-Chemikalien versehen ist, und in dem Nebenkreis für das in dem Eindicker anfallende Wasser eine Nebenkreis-Flotationsvorrichtung vorgesehen ist, von der aus eine Rücklaufleitung für das Klärwasser in den Aufbereitungsprozess mündet. A system according to the invention for carrying out the method with a pulper, a cleaning device, a thickener, a feed line for deinking chemicals, a reaction tower with a dilution zone in the lower region and with a downstream flotation device consists in the fact that the plant with another, in the pulper opening supply line for deinking chemicals is provided, and a secondary circuit flotation device is provided in the secondary circuit for the water accumulating in the thickener, from which a return line for the sewage water opens into the treatment process.
In Weiterbildung der erfindungsgemässen Anlage ist vorgesehen, dass die Schaumabzugsleitung der dem Reaktionsturm nachgeschalteten Flotationsvorrichtung in die Nebenkreis-Flotationsvorrichtung mündet. In a further development of the system according to the invention, it is provided that the foam discharge line of the flotation device downstream of the reaction tower opens into the secondary circuit flotation device.
Von Vorteil ist es weiterhin, wenn für den in der Neben-kreis-Flotationsvorrichtung anfallenden Schaum eine Zentrifuge vorgesehen ist, wobei für das in der Zentrifuge anfallende Klärwasser eine Rückleitung in den Aufbereitungsprozess vorgesehen ist. It is also advantageous if a centrifuge is provided for the foam obtained in the secondary circuit flotation device, with a return line to the treatment process being provided for the sewage water obtained in the centrifuge.
Nachfolgend ist anhand der Figur ein Verfahrensschema der Erfindung näher beschrieben. A method scheme of the invention is described in more detail below with reference to the figure.
In einem Stofflöser 1 wird Altpapier 2 in Ballenform eingebracht. Gleichzeitig werden über eine Leitung 3 Wasser und eine Zufuhrleitung 4 Deinking-Chemikalien und gegebenenfalls weitere Chemikalien zugegeben. Der grob aufgelöste s Waste paper 2 is introduced into a bale in a pulper 1. At the same time 3 deinking chemicals and possibly other chemicals are added via a line 3 water and a supply line 4. The roughly resolved s
10 10th
15 15
20 20th
25 25th
30 30th
35 35
40 40
45 45
50 50
55 55
60 60
65 65
Stoff gelangt anschliessend in eine Reinigungs-Sortierein-richtung 5. Diese Einrichtung kann z. B. von der Art sein, wie sie in der DE-OS 2 514 162 beschrieben ist. Die Entwässerung der Suspension auf einen Wert von über 10% Stoffdichte, vorzugsweise ca. 20%, erfolgt auf einem Banddruckfilter 6. Anschliessend gelangt die so eingedickte Suspension in einen Chemikalienmischer 7, wobei vorher oder gleichzeitig über eine Zuleitung 8 weitere Deinking-Chemikalien, z. B. Peroxyd, zugegeben werden können. Nach entsprechender Vermischung der Chemikalien mit der Suspension in dem Mischer 7 gelangt der Stoff in einen Reaktionsturm 9, in dem er vorzugsweise für 1 bis 3 Stunden bei einer Stoffdichte von ca. 20% verbleibt. Nach einer Verdünnung durch Zugabe von Wasser über eine Leitung 10 auf ca. 4% wird der Stoff aus dem Reaktionsturm 9 ausgeschleust und gelangt nach einem Entstipper 11 in eine FlotationsVorrichtung 12. Der von Verunreinigungen, insbesondere von Druckfarben, befreite Stoff wird in 13 einer Feinsortierung unterzogen und in einer Ein- Subsequently, the fabric passes into a cleaning sorting device 5. B. be of the type as described in DE-OS 2 514 162. The suspension is dewatered to a value of over 10% consistency, preferably about 20%, on a belt pressure filter 6. The suspension thus thickened is then passed into a chemical mixer 7, with 8 or more deinking chemicals, e.g. . B. peroxide can be added. After appropriate mixing of the chemicals with the suspension in the mixer 7, the substance enters a reaction tower 9, in which it preferably remains for 1 to 3 hours at a density of approximately 20%. After dilution by adding water via a line 10 to approx. 4%, the substance is discharged from the reaction tower 9 and, after a deflaker 11, reaches a flotation device 12. The substance freed of impurities, in particular printing inks, is subjected to a fine sorting in 13 subjected and in one
3 636148 3 636148
dickungsvorrichtung 14 auf Werte zwischen 6 und 25% Trok-kengehalt eingedickt und anschliessend weiter zur Papiermaschine, gegebenenfalls nach einer Bleiche in 15, transportiert. Das bei der Eindickeinrichtung 14 anfallende Filtratwasser 5 wird in die Leitung 10 zurückgeführt (ggf. auch in Leitung 3). Thickening device 14 thickened to values between 6 and 25% dry matter content and then transported further to the paper machine, optionally after bleaching in 15. The filtrate water 5 obtained in the thickening device 14 is returned to line 10 (possibly also in line 3).
Das in dem Banddruckfilter 6 anfallende mit Druckfarben und anderen Verunreinigungen beladene Wasser wird über eine Leitung 16 einer Nebenkreis-Flotationsvorrichtung 17 zugeführt, von der aus das gereinigte Wasser in die Leitung 3 io zurückgeführt wird. Der in der Flotationsvorrichtung 17 anfallende Schaum wird einer Zentrifuge 18 zugeleitet, in der der Schlamm abgetrennt und das zurückgewonnene Wasser der Flotationsanlage 12 zugegeben wird. Das in der Zentrifuge 18 anfallende Wasser kann gegebenenfalls auch an i5 anderer Stelle in den Aufbereitungsprozess eingeleitet werden. Der in der Flotationsvorrichtung 12 anfallende Schaum wird über eine Schaumabzugsleitung 19 zur Nachflotation der Flotationsvorrichtung 17 zugeführt. The water in the band pressure filter 6 loaded with printing inks and other impurities is fed via a line 16 to a secondary circuit flotation device 17, from which the cleaned water is returned to line 3 io. The foam obtained in the flotation device 17 is fed to a centrifuge 18, in which the sludge is separated off and the recovered water is added to the flotation plant 12. The water accumulating in the centrifuge 18 can optionally also be introduced into the treatment process at another point. The foam obtained in the flotation device 12 is fed via a foam discharge line 19 for subsequent flotation of the flotation device 17.
B B
1 Blatt Zeichnungen 1 sheet of drawings
Claims (5)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2813448A DE2813448B1 (en) | 1978-03-29 | 1978-03-29 | Process and plant for recycling waste paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH636148A5 true CH636148A5 (en) | 1983-05-13 |
Family
ID=6035634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH198779A CH636148A5 (en) | 1978-03-29 | 1979-02-28 | METHOD AND SYSTEM FOR REPROCESSING WASTE PAPER. |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS55132789A (en) |
| AT (1) | AT364907B (en) |
| BE (1) | BE875157A (en) |
| CH (1) | CH636148A5 (en) |
| DE (1) | DE2813448B1 (en) |
| ES (1) | ES478106A1 (en) |
| FI (1) | FI791020A (en) |
| FR (1) | FR2421241A1 (en) |
| GB (1) | GB2017780B (en) |
| IT (1) | IT1121453B (en) |
| NL (1) | NL7902142A (en) |
| SE (1) | SE7902349L (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2904326C3 (en) * | 1979-02-05 | 1982-05-13 | Naamloze Vennootschap Papierfabriek Gennep, Gennep | Process and device for deinking pulp suspensions |
| DE2947862C2 (en) * | 1979-11-28 | 1982-04-01 | J.M. Voith Gmbh, 7920 Heidenheim | Process and plant for the production of a pulp suspension from waste paper |
| GB2112830A (en) * | 1981-12-09 | 1983-07-27 | Steinbeis Papier Gmbh | Upgrading used paper |
| IT1155310B (en) * | 1982-04-19 | 1987-01-28 | Jean Marie Clement | PROCESS FOR THE RECYCLING PROCESS OF PAPER PRINTED FROM MACERO |
| AT374839B (en) * | 1982-12-23 | 1984-06-12 | Andritz Ag Maschf | METHOD FOR PRODUCING FIBER FIBER FROM PAPER WASTE WITH A HIGH LEVEL OF POLLUTION |
| DE3305131A1 (en) * | 1983-02-15 | 1984-08-16 | Degussa Ag, 6000 Frankfurt | METHOD FOR REMOVING WASTE PAPER |
| CH665859A5 (en) * | 1984-12-19 | 1988-06-15 | Escher Wyss Gmbh | METHOD AND DEVICE FOR REMOVING IMPURITIES FROM WASTE PAPER. |
| DE3522395C1 (en) * | 1985-06-22 | 1986-11-20 | J.M. Voith Gmbh, 7920 Heidenheim | Process and arrangement for processing waste paper |
| FR2612212B1 (en) * | 1987-03-13 | 1990-06-29 | Centre Tech Ind Papier | PROCESS AND INSTALLATION FOR RECYCLING OF OLD PRINTED PAPERS |
| DE3822454C1 (en) * | 1988-07-02 | 1989-08-24 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
| DE3831668A1 (en) * | 1988-09-17 | 1990-03-22 | Escher Wyss Gmbh | METHOD FOR INCREASING WHITE GRADE OF WASTE PAPER WITH NEUTRAL WATER CIRCUIT |
| DE4130472C2 (en) * | 1991-09-13 | 1995-05-11 | Escher Wyss Gmbh | Method and device for treating a fiber suspension |
| DE4206206C2 (en) * | 1992-02-28 | 1993-11-25 | Voith Gmbh J M | Process for cleaning the rejects from deinking flotation |
| DE4223485A1 (en) * | 1992-07-17 | 1994-01-20 | Voith Gmbh J M | Process for processing waste paper |
| DE4238336A1 (en) * | 1992-11-13 | 1994-05-19 | Voith Gmbh J M | Used paper suspension cleaning process and appts. - has thickener or washer for sludge from flotation unit to be returned to the flotation stage |
| DE19938976A1 (en) * | 1999-08-17 | 2001-03-01 | Voith Sulzer Papiertech Patent | Process for the preparation of a paper fiber raw material containing wood pulp |
| US7544271B1 (en) | 2006-06-12 | 2009-06-09 | Narayanasamy Seenivasan | Open flotation de-inking module for recycled paper |
| US7562777B1 (en) | 2006-06-12 | 2009-07-21 | Narayanasamy Seenivasan | Flotation cell injector assembly for use with open or closed flotation deinking modules for recycled paper |
| US7537674B1 (en) | 2006-06-12 | 2009-05-26 | Narayanasamy Seenivasan | Closed floatation de-inking module for recycled paper |
| DE102006057861A1 (en) * | 2006-12-08 | 2008-06-12 | Voith Patent Gmbh | Method for treating a filtrate produced from a paper fiber suspension of waste paper comprises adding the filtrate partly to the paper fiber suspension at a site lying downstream of a thickening units from which the filtrate is produced |
| DE102008008762A1 (en) * | 2008-02-12 | 2009-08-13 | Voith Patent Gmbh | Filtrate treating method for use during thickening of paper fiber suspension obtained from waste paper to produce graphical paper, involves adding partial flows to filtrates, where partial flows are produced from condensed substances |
| DE102011005650A1 (en) | 2011-03-16 | 2012-09-20 | Voith Patent Gmbh | Method for controlling the filter performance of a filter device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1322631A (en) * | 1961-05-18 | 1963-03-29 | Voith Gmbh J M | Process for treating the foam formed during flotation of printed waste paper and containing printing ink and similar substances |
| JPS5220563B1 (en) * | 1968-10-19 | 1977-06-04 | ||
| DE2311674C3 (en) * | 1973-03-09 | 1978-01-19 | Degussa | PROCESS FOR REGENERATING WASTE PAPER |
| DD130266B1 (en) * | 1977-04-01 | 1982-11-24 | Manhart Schlegel | METHOD FOR INCREASING THE WHITE GRADE OF DEINKED AGING MATERIALS |
-
1978
- 1978-03-29 DE DE2813448A patent/DE2813448B1/en not_active Ceased
-
1979
- 1979-01-30 AT AT66479A patent/AT364907B/en not_active IP Right Cessation
- 1979-02-23 GB GB7906504A patent/GB2017780B/en not_active Expired
- 1979-02-27 ES ES478106A patent/ES478106A1/en not_active Expired
- 1979-02-28 CH CH198779A patent/CH636148A5/en not_active IP Right Cessation
- 1979-03-08 FR FR7906304A patent/FR2421241A1/en not_active Withdrawn
- 1979-03-15 SE SE7902349A patent/SE7902349L/en not_active Application Discontinuation
- 1979-03-19 NL NL7902142A patent/NL7902142A/en not_active Application Discontinuation
- 1979-03-27 FI FI791020A patent/FI791020A/en not_active Application Discontinuation
- 1979-03-28 JP JP3570979A patent/JPS55132789A/en active Pending
- 1979-03-28 IT IT6764879A patent/IT1121453B/en active
- 1979-03-28 BE BE0/194268A patent/BE875157A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE7902349L (en) | 1979-09-30 |
| GB2017780A (en) | 1979-10-10 |
| IT1121453B (en) | 1986-04-02 |
| DE2813448B1 (en) | 1978-09-21 |
| IT7967648A0 (en) | 1979-03-28 |
| ES478106A1 (en) | 1979-05-16 |
| FR2421241A1 (en) | 1979-10-26 |
| ATA66479A (en) | 1981-04-15 |
| BE875157A (en) | 1979-07-16 |
| NL7902142A (en) | 1979-10-02 |
| AT364907B (en) | 1981-11-25 |
| FI791020A (en) | 1979-09-30 |
| GB2017780B (en) | 1982-09-02 |
| JPS55132789A (en) | 1980-10-15 |
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