CA1104401A - Apparatus for processing waste paper - Google Patents
Apparatus for processing waste paperInfo
- Publication number
- CA1104401A CA1104401A CA315,219A CA315219A CA1104401A CA 1104401 A CA1104401 A CA 1104401A CA 315219 A CA315219 A CA 315219A CA 1104401 A CA1104401 A CA 1104401A
- Authority
- CA
- Canada
- Prior art keywords
- stock
- outlet
- weight substances
- slusher
- separation device
- 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
Classifications
-
- 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
-
- 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)
Abstract
6300 INVENTORS: MANFRED KOHRS and WOLFGANG HEINBOCKEL
INVENTION: APPARATUS FOR PROCESSING WASTE PAPER
ABSTRACT OF THE DISCLOSURE
An apparatus for processing waste paper com-prising a stock slusher for slushing waste paper, at least one separation device for separating out heavy contaminants arranged after the stock slusher and a fiberizer arranged after the separation device. The fiberizer has an outlet for good stock, an outlet or discharge line for light weight substances or particles which are to be separated and an outlet for heavy weight substances or particles which are to be separated.
The outlet for the heavy weight substances which are to be separated is connected, by an outlet line or conduit, with a location of the apparatus disposed in front of the separation device for the heavy contaminants.
INVENTION: APPARATUS FOR PROCESSING WASTE PAPER
ABSTRACT OF THE DISCLOSURE
An apparatus for processing waste paper com-prising a stock slusher for slushing waste paper, at least one separation device for separating out heavy contaminants arranged after the stock slusher and a fiberizer arranged after the separation device. The fiberizer has an outlet for good stock, an outlet or discharge line for light weight substances or particles which are to be separated and an outlet for heavy weight substances or particles which are to be separated.
The outlet for the heavy weight substances which are to be separated is connected, by an outlet line or conduit, with a location of the apparatus disposed in front of the separation device for the heavy contaminants.
Description
11~4~
BACKGROUND OF THE INVENTION
The present invention relates to a new and improved construction of apparatus for processing waste paper.
The processing equipment or waste paper pro-cessor of the present invention is of the type comprising a stock slusher for slushing waste paper, at least one separation device or separator for heavy contaminants arranged after the stock slusher and a fiberizer arranged following the separation device. The fiberizer has an outlet for good stock, an outlet line or conduit for light weight substances which are to be separated and an ; outlet for heavy weight substances which are to be separated.
. .
An installation of this type has been dis-closed, by way of example, in the article entitled "Der Escher Wyss Fiberizer im Altpaper-Aufbereitungsstrang"
(roughly translated: "The Escher Wyss Fiberizer in Waste Paper-Processing Line"), appearing in "Wochenblatt fur Papierfabrikation", Volume 5/1975, pages 165 and 166, Figures 1 and 2.
~, .
SUMMARY OF THE INVENTION
It is a primary object of the present inven-tion to improve upon this known installation.
BACKGROUND OF THE INVENTION
The present invention relates to a new and improved construction of apparatus for processing waste paper.
The processing equipment or waste paper pro-cessor of the present invention is of the type comprising a stock slusher for slushing waste paper, at least one separation device or separator for heavy contaminants arranged after the stock slusher and a fiberizer arranged following the separation device. The fiberizer has an outlet for good stock, an outlet line or conduit for light weight substances which are to be separated and an ; outlet for heavy weight substances which are to be separated.
. .
An installation of this type has been dis-closed, by way of example, in the article entitled "Der Escher Wyss Fiberizer im Altpaper-Aufbereitungsstrang"
(roughly translated: "The Escher Wyss Fiberizer in Waste Paper-Processing Line"), appearing in "Wochenblatt fur Papierfabrikation", Volume 5/1975, pages 165 and 166, Figures 1 and 2.
~, .
SUMMARY OF THE INVENTION
It is a primary object of the present inven-tion to improve upon this known installation.
- 2 -,~
. . , - - ~ - , . - - , ~ - . , , l~a4~
Another and more specific ob~ect of the present invention is to provide an apparatus for processing waste paper having an improved mode of operation, especially a better separation effect for heavy contaminants.
Yet a further significant object of the pre-sent invention aims at a new and improved construction of ~:
apparatus for processing waste paper which is relatively simple in design, economical to manufacture and operate, -highly efficient in processing waste paper, and specifically in removing the heavy contaminants therefrom.
Now in order to implement these and still further objects of the invention, which will become more ` readily apparent as the description proceeds, the apparatus of the present development is manifested by the features that the outlet for the heavy weight substances which are to be separated is connected by means of an outlet line or conduit with a location of the apparatus dispositioned in front of the separation device for the heavy contaminants.
` With the heretofore known installation the outlet for the heavy weight substances to be separated is provided with a sluice where there are collected the heavy weight substances. This sluice had to be opened periodic-ally in order to remove the heavy weight substances which were separated.
.
' .
~ , . . . . . . .
11~44~1 It has been found that the separation effect of the installation for the heavy weight substances or particles can be improved by allowing a certain uniform flow out of the outer region of the fiberizer through the outlet for the heavy weight substances. At the same time there is thus avoided any over filling of the outlet for the heavy weight substances w~ich are to be separated, if, for instance, the operator forgets to open, at the proper point in time, the outlet for the heavy weight substances.
This improved operation can be beneficially realized without the need for installing any additional devices, and specific-ally, only with the aid of the already existing separation device, while omitting the sluice.
Preferably there can be arranged in the outlet line or conduit for the heavy weight substances and also - in the outlet line or conduit for the light weight sub-stances shutoff elements, typically valves. A control device serves for alternately actuating the shutoff elements.
In this way there is obtained a compensation or balancing of the substance flow from the stock slusher to the fiberizer, since there are avoided the occurrence of surge-like fluctuations of such flow velocity by opening one of the shutoff elements.
,~
The outlet line or conduit for the neavy weight substances can open into the connection line or conduit extending between the stock slusher and the separation 49~1 device for the heavy contaminants.
However, the outlet line or conduit for the heavy weight substances also can lead back to the stock slusher. In such case the stock slusher is additionally loaded by the recycled quantity of stock, but, on the other hand, there is additionally employed the device located in the stock slusher for separating out the heavy weight substances.
; BRIEF DESCRIPTION OF THE DRAWING
The invention will be better understood and objects other than those set forth above, will become appar0nt when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawing wherein the single Figure schematically shows an exemplary embodiment of apparatus for processing waste paper constructed according to the present invention.
DETAILE_ DESCRIPTION OF THE PREFERRED EMBODIMENTS
Describing now the drawing, the exemplary illustrated embodiment of apparatus for processing waste ..
:;
.
1~49~
paper will be seen to comprise a conventional stock slusher 1 containing a rotor 2 having a substantially vertical axis and driven by an~ suitable drive motor 3.
Below the rotor 2 there is located a perforated plate or sieve 4 which delimits a space or chamber 5 for the withdrawal of good stock. Leading from this space or chamber 5 is a connection line or conduit 6 to a separa-tion device or separator 7 for separating out heavy con-taminants. A pump 8 for conveying the dissolved stock or suspension is located in the connection line or conduit 6.
The stock slusher 1 is equipped with a sluice 10 for the removal of heavy contaminants which have been separated in the stock slusher 1. Reference character 11 represents bales of waste paper which are introduced into the stock slusher 1. Additionally, the arrow 12 schematically ; represents the infeed of water serving for slusher or dissolving the waste paper.
The separation device 7, which can be designed in the fashion of a hydrocyclone, has a sluice 13 for the removal of the separated heavy contaminants. As a rule, at this location there are used a battery or array of a number of parallel connected hydrocyclones.
Leading from the separation device 7 is a connection line or conduit 14 to a fiberizer 15 (also referred to in the art as a stock pulper), which, for in-stance, can be designed in accordance with the teachings of the commonly assigned, United States Patent No. 3,942,728, granted March 9, 1976 (corresponding to German Patent No. 2,345,735). This fiberizer 15, containing a rotor 17 driven by a drive motor 16, is provided with an inlet 18 for the stock suspension which is to be processed, an outlet 20 for good stock, and an outlet 21 for light weight substances or particles which are to be separated and an outlet 22 for heavy weight substances or particles ; which are separated. At the outlet 21 for the light weight substances which are to be separated there is con-nected an outlet line or conduit 23 which leads to a dynamic jarrer or vibrator 24 or equivalent structure having a movable sieve or screen 25. The fiber-containing liquid passing through the sieve 25 is returned by a line or conduit 26 back to the stock slusher 1.
At the outlet 22 for the heavy weight sub-stances which are to be separated there merges an outlet line ox conduit 27.which opens into the conduit or line 6 -; in front of the pump 8 and forwardly or upstream of the ~ .
~44~1 separation device 7. As indicated however by the broken line illustrated conduit or line 27' this outlet conduit or line 27 also can lead back into the stock slusher 1.
As already mentioned the heavy weight sub-stances or particles which have been separated in the fiberizer 15 are once again fed by the outlet line or con-duit 27 back into the separation device 7 where they can be finally separated. With return flow or feedback of the heavy weight substances, separated in the fiberizer 15, to the stock slusher 1, there is in fact afforded the possi-bility of separating out the heavy weight substances in such stock slusher 1 where they then arrive at the sluice 10.
According to the invention there is thus achieved an improve-ment in the separation action or effect for the heavy weight substances or particles in the apparatus, without the need for additional devices, only by resorting to the aid of a return line or conduit.
As also will be further apparent from the showing of the drawing, shutoff elements 30 and 31 are arranged in the outlet lines or conduits 23 and 27, respectively. These shutoff elements 30 and 31, as mentioned typically valves, are connected with any suitable control device or control means 32 which alternately actuates these shutoff elements. Consequently, the flow or stream containing the heavy contaminants emanating from the outlet 22 is briefly interrupted, something which only inconsequentially impairs the effect of the processing method. A longer closing and only brief opening of the light weight substance line or conduit is advantageous.
The advantage of this is the compensation of the flow between the stock slusher 1 and the fiberizer 15, thereby preventing an increase of the peak value of its throughput.
_ g _
. . , - - ~ - , . - - , ~ - . , , l~a4~
Another and more specific ob~ect of the present invention is to provide an apparatus for processing waste paper having an improved mode of operation, especially a better separation effect for heavy contaminants.
Yet a further significant object of the pre-sent invention aims at a new and improved construction of ~:
apparatus for processing waste paper which is relatively simple in design, economical to manufacture and operate, -highly efficient in processing waste paper, and specifically in removing the heavy contaminants therefrom.
Now in order to implement these and still further objects of the invention, which will become more ` readily apparent as the description proceeds, the apparatus of the present development is manifested by the features that the outlet for the heavy weight substances which are to be separated is connected by means of an outlet line or conduit with a location of the apparatus dispositioned in front of the separation device for the heavy contaminants.
` With the heretofore known installation the outlet for the heavy weight substances to be separated is provided with a sluice where there are collected the heavy weight substances. This sluice had to be opened periodic-ally in order to remove the heavy weight substances which were separated.
.
' .
~ , . . . . . . .
11~44~1 It has been found that the separation effect of the installation for the heavy weight substances or particles can be improved by allowing a certain uniform flow out of the outer region of the fiberizer through the outlet for the heavy weight substances. At the same time there is thus avoided any over filling of the outlet for the heavy weight substances w~ich are to be separated, if, for instance, the operator forgets to open, at the proper point in time, the outlet for the heavy weight substances.
This improved operation can be beneficially realized without the need for installing any additional devices, and specific-ally, only with the aid of the already existing separation device, while omitting the sluice.
Preferably there can be arranged in the outlet line or conduit for the heavy weight substances and also - in the outlet line or conduit for the light weight sub-stances shutoff elements, typically valves. A control device serves for alternately actuating the shutoff elements.
In this way there is obtained a compensation or balancing of the substance flow from the stock slusher to the fiberizer, since there are avoided the occurrence of surge-like fluctuations of such flow velocity by opening one of the shutoff elements.
,~
The outlet line or conduit for the neavy weight substances can open into the connection line or conduit extending between the stock slusher and the separation 49~1 device for the heavy contaminants.
However, the outlet line or conduit for the heavy weight substances also can lead back to the stock slusher. In such case the stock slusher is additionally loaded by the recycled quantity of stock, but, on the other hand, there is additionally employed the device located in the stock slusher for separating out the heavy weight substances.
; BRIEF DESCRIPTION OF THE DRAWING
The invention will be better understood and objects other than those set forth above, will become appar0nt when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawing wherein the single Figure schematically shows an exemplary embodiment of apparatus for processing waste paper constructed according to the present invention.
DETAILE_ DESCRIPTION OF THE PREFERRED EMBODIMENTS
Describing now the drawing, the exemplary illustrated embodiment of apparatus for processing waste ..
:;
.
1~49~
paper will be seen to comprise a conventional stock slusher 1 containing a rotor 2 having a substantially vertical axis and driven by an~ suitable drive motor 3.
Below the rotor 2 there is located a perforated plate or sieve 4 which delimits a space or chamber 5 for the withdrawal of good stock. Leading from this space or chamber 5 is a connection line or conduit 6 to a separa-tion device or separator 7 for separating out heavy con-taminants. A pump 8 for conveying the dissolved stock or suspension is located in the connection line or conduit 6.
The stock slusher 1 is equipped with a sluice 10 for the removal of heavy contaminants which have been separated in the stock slusher 1. Reference character 11 represents bales of waste paper which are introduced into the stock slusher 1. Additionally, the arrow 12 schematically ; represents the infeed of water serving for slusher or dissolving the waste paper.
The separation device 7, which can be designed in the fashion of a hydrocyclone, has a sluice 13 for the removal of the separated heavy contaminants. As a rule, at this location there are used a battery or array of a number of parallel connected hydrocyclones.
Leading from the separation device 7 is a connection line or conduit 14 to a fiberizer 15 (also referred to in the art as a stock pulper), which, for in-stance, can be designed in accordance with the teachings of the commonly assigned, United States Patent No. 3,942,728, granted March 9, 1976 (corresponding to German Patent No. 2,345,735). This fiberizer 15, containing a rotor 17 driven by a drive motor 16, is provided with an inlet 18 for the stock suspension which is to be processed, an outlet 20 for good stock, and an outlet 21 for light weight substances or particles which are to be separated and an outlet 22 for heavy weight substances or particles ; which are separated. At the outlet 21 for the light weight substances which are to be separated there is con-nected an outlet line or conduit 23 which leads to a dynamic jarrer or vibrator 24 or equivalent structure having a movable sieve or screen 25. The fiber-containing liquid passing through the sieve 25 is returned by a line or conduit 26 back to the stock slusher 1.
At the outlet 22 for the heavy weight sub-stances which are to be separated there merges an outlet line ox conduit 27.which opens into the conduit or line 6 -; in front of the pump 8 and forwardly or upstream of the ~ .
~44~1 separation device 7. As indicated however by the broken line illustrated conduit or line 27' this outlet conduit or line 27 also can lead back into the stock slusher 1.
As already mentioned the heavy weight sub-stances or particles which have been separated in the fiberizer 15 are once again fed by the outlet line or con-duit 27 back into the separation device 7 where they can be finally separated. With return flow or feedback of the heavy weight substances, separated in the fiberizer 15, to the stock slusher 1, there is in fact afforded the possi-bility of separating out the heavy weight substances in such stock slusher 1 where they then arrive at the sluice 10.
According to the invention there is thus achieved an improve-ment in the separation action or effect for the heavy weight substances or particles in the apparatus, without the need for additional devices, only by resorting to the aid of a return line or conduit.
As also will be further apparent from the showing of the drawing, shutoff elements 30 and 31 are arranged in the outlet lines or conduits 23 and 27, respectively. These shutoff elements 30 and 31, as mentioned typically valves, are connected with any suitable control device or control means 32 which alternately actuates these shutoff elements. Consequently, the flow or stream containing the heavy contaminants emanating from the outlet 22 is briefly interrupted, something which only inconsequentially impairs the effect of the processing method. A longer closing and only brief opening of the light weight substance line or conduit is advantageous.
The advantage of this is the compensation of the flow between the stock slusher 1 and the fiberizer 15, thereby preventing an increase of the peak value of its throughput.
_ g _
Claims (4)
1. An apparatus for processing waste paper comprising:
a stock slusher for dissolving waste paper;
a separation device arranged after the stock slusher and serving for the separation of heavy contaminants;
means for operatively connecting the stock slusher with the separation device;
a fiberizer arranged after the separation device;
means for operatively connecting the separa-tion device with the fiberizer;
said fiberizer having an outlet for good stock, an outlet conduit for light weight substances which are to be separated and an outlet for heavy weight substances which are to be separated; and an outlet conduit for connecting the outlet for the heavy weight substances to be separated with a location of the apparatus disposed in front of the separation device for the heavy contaminants.
a stock slusher for dissolving waste paper;
a separation device arranged after the stock slusher and serving for the separation of heavy contaminants;
means for operatively connecting the stock slusher with the separation device;
a fiberizer arranged after the separation device;
means for operatively connecting the separa-tion device with the fiberizer;
said fiberizer having an outlet for good stock, an outlet conduit for light weight substances which are to be separated and an outlet for heavy weight substances which are to be separated; and an outlet conduit for connecting the outlet for the heavy weight substances to be separated with a location of the apparatus disposed in front of the separation device for the heavy contaminants.
2. The apparatus as defined in claim 1, further including:
shutoff means arranged in the outlet conduit for the heavy weight substances and in the outlet conduit for the light weight substances; and control means for alternately actuating said shutoff means.
shutoff means arranged in the outlet conduit for the heavy weight substances and in the outlet conduit for the light weight substances; and control means for alternately actuating said shutoff means.
3. The apparatus as defined in claim 1, wherein:
said means for operatively connecting the stock slusher with the separation device includes a connection line convey-ing the heavy contaminants and leading from the stock slusher to the separation device; and said outlet conduit for the heavy weight substances opening into said connection line.
said means for operatively connecting the stock slusher with the separation device includes a connection line convey-ing the heavy contaminants and leading from the stock slusher to the separation device; and said outlet conduit for the heavy weight substances opening into said connection line.
4. The apparatus as defined in claim 1, wherein:
said outlet conduit for the heavy weight substances feeds back into the stock slusher.
said outlet conduit for the heavy weight substances feeds back into the stock slusher.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1455877 | 1977-11-29 | ||
| CH14558/77 | 1977-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1104401A true CA1104401A (en) | 1981-07-07 |
Family
ID=4401837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA315,219A Expired CA1104401A (en) | 1977-11-29 | 1978-10-31 | Apparatus for processing waste paper |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5482404A (en) |
| AR (1) | AR216349A1 (en) |
| AT (1) | AT355903B (en) |
| CA (1) | CA1104401A (en) |
| DE (1) | DE2757580C2 (en) |
| ES (1) | ES474527A1 (en) |
| FR (1) | FR2410079A1 (en) |
| IT (1) | IT1100284B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2759113C2 (en) * | 1977-12-30 | 1979-05-17 | J.M. Voith Gmbh, 7920 Heidenheim | Process and system for processing waste paper |
| AT365676B (en) * | 1979-05-04 | 1982-02-10 | Escher Wyss Gmbh | PLANT FOR TREATING WASTE PAPER |
| JPS583072B2 (en) * | 1979-07-10 | 1983-01-19 | 大昭和エンジニアリング株式会社 | Circulating waste paper disintegration processing method |
| AT370795B (en) * | 1979-10-10 | 1983-05-10 | Escher Wyss Gmbh | METHOD FOR OPERATING A PLANT FOR PROCESSING WASTE PAPER AND PLANT FOR IMPLEMENTING THE METHOD |
| CH649112A5 (en) * | 1980-10-03 | 1985-04-30 | Escher Wyss Gmbh | METHOD FOR FRACTIONING FIBER FIBER RECOVERED FROM WASTE PAPER, AND PLANT FOR CARRYING OUT THE METHOD. |
| DE3345548C2 (en) * | 1983-12-16 | 1986-09-18 | J.M. Voith Gmbh, 7920 Heidenheim | Process and arrangement for processing waste paper |
| JPH0214089A (en) * | 1988-06-30 | 1990-01-18 | Tokushichi Yamazaki | Separator for impurities in old paper as papermaking raw material |
| DE102006008761A1 (en) * | 2006-02-24 | 2007-08-30 | Voith Patent Gmbh | Process for dissolving and cleaning pulp-containing paper raw materials |
| EP2274471B1 (en) * | 2008-03-20 | 2013-11-06 | OVIVO LUXEMBOURGH S.a.r.l. | A method for pulping waste paper |
| JP5905364B2 (en) * | 2012-08-14 | 2016-04-20 | 三菱重工環境・化学エンジニアリング株式会社 | Paper supply device, defibrating system, and sludge dewatering system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB825216A (en) * | 1955-04-21 | 1959-12-09 | Bauer Bros Co | Method of producing wood pulp |
| US3873410A (en) * | 1973-08-27 | 1975-03-25 | Black Clawson Co | Method and apparatus for recovering paper fibers from waste paper containing materials |
| DE2514162B2 (en) * | 1975-03-29 | 1977-02-03 | Anlage zur Aufbereitung von Altpapier J.M. Voith GmbH, 7920 Heidenheim | PLANT FOR THE PROCESSING OF WASTE PAPER |
| CA1023985A (en) * | 1975-06-16 | 1978-01-10 | Black Clawson Company (The) | Apparatus for pulping waste paper materials |
-
1977
- 1977-12-05 AT AT870377A patent/AT355903B/en not_active IP Right Cessation
- 1977-12-23 DE DE2757580A patent/DE2757580C2/en not_active Expired
-
1978
- 1978-10-19 AR AR27414678A patent/AR216349A1/en active
- 1978-10-25 ES ES474527A patent/ES474527A1/en not_active Expired
- 1978-10-26 FR FR7830489A patent/FR2410079A1/en active Granted
- 1978-10-31 CA CA315,219A patent/CA1104401A/en not_active Expired
- 1978-11-21 IT IT2996978A patent/IT1100284B/en active
- 1978-11-28 JP JP14613578A patent/JPS5482404A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| AT355903B (en) | 1980-03-25 |
| JPS5482404A (en) | 1979-06-30 |
| FR2410079B1 (en) | 1983-12-16 |
| DE2757580C2 (en) | 1979-03-15 |
| ES474527A1 (en) | 1979-03-16 |
| AR216349A1 (en) | 1979-12-14 |
| DE2757580B1 (en) | 1978-07-13 |
| IT7829969A0 (en) | 1978-11-21 |
| IT1100284B (en) | 1985-09-28 |
| FR2410079A1 (en) | 1979-06-22 |
| ATA870377A (en) | 1979-08-15 |
| JPS5717996B2 (en) | 1982-04-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |