DE2343323C2 - Mixing tank for the continuous addition and mixing of flocculants to sludge, especially sewage sludge - Google Patents
Mixing tank for the continuous addition and mixing of flocculants to sludge, especially sewage sludgeInfo
- Publication number
- DE2343323C2 DE2343323C2 DE2343323A DE2343323A DE2343323C2 DE 2343323 C2 DE2343323 C2 DE 2343323C2 DE 2343323 A DE2343323 A DE 2343323A DE 2343323 A DE2343323 A DE 2343323A DE 2343323 C2 DE2343323 C2 DE 2343323C2
- Authority
- DE
- Germany
- Prior art keywords
- sludge
- mixing
- mixing container
- flocculant
- agitator
- 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
- 239000010802 sludge Substances 0.000 title claims description 26
- 239000008394 flocculating agent Substances 0.000 title claims description 8
- 239000010801 sewage sludge Substances 0.000 title claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 4
- 230000006378 damage Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000016615 flocculation Effects 0.000 claims 4
- 238000005189 flocculation Methods 0.000 claims 4
- 101150049168 Nisch gene Proteins 0.000 claims 1
- 210000003608 fece Anatomy 0.000 claims 1
- 239000010871 livestock manure Substances 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 239000008267 milk Substances 0.000 claims 1
- 210000004080 milk Anatomy 0.000 claims 1
- 235000013336 milk Nutrition 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000000126 substance Substances 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/03—Processes of filtration using flocculating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
- B01F31/44—Mixers with shaking, oscillating, or vibrating mechanisms with stirrers performing an oscillatory, vibratory or shaking movement
- B01F31/445—Mixers with shaking, oscillating, or vibrating mechanisms with stirrers performing an oscillatory, vibratory or shaking movement performing an oscillatory movement about an axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/711—Feed mechanisms for feeding a mixture of components, i.e. solids in liquid, solids in a gas stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/712—Feed mechanisms for feeding fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/7179—Feed mechanisms characterised by the means for feeding the components to the mixer using sprayers, nozzles or jets
-
- 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
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
- Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
Description
50 ren kann.50 ren can.
Im einzelnen kann daher die Erfindung in derIn detail, therefore, the invention in the
Weise besonders vorteilhaft ausgebildet werden, daßWay to be particularly advantageous that
die bis in den Bereich des unteren Endes des Mischbehälters reichende Welle des Rührwerkes als Hohl-the shaft of the agitator reaching into the area of the lower end of the mixing container as a hollow
Die Erfindung bezieht sich auf einen Mischbehäl- 55 welle ausgebildet ist und als Zulauf für das Flok-The invention relates to a Mischbehäl- 55 shaft is designed and used as an inlet for the Flok-
ler zur kontinuierlichen Zugabe und Mischung von kungsmittel dient. Hierbei kann die RührwerkswelleLer is used for the continuous addition and mixing of solvents. Here the agitator shaft
Flockungsmitteln zu Schlamm, insbesondere zu Klär- zweckmäßig an ihrem unteren Ende mit mehrerenFlocculants to sludge, especially to clarification, expediently at their lower end with several
•chlamm, der anschließend auf Filterpressen ausge- verschieden langen Austrittsarmen, die Austritts-Dü-• sludge, which is then transferred to filter presses with outlet arms of different lengths, the outlet nozzle
ireßt wird, mit Zuläufen für den Schlamm und das sen für die Flockungsmitteleinspeisung tragen, verselockungsmittel und mit einem Rührwerk. 60 hen sein. Ferner ist es besonders zweckmäßig, das Beispielsweise bei Klärschlamm, welcher auf FiI- Fahrwerk als Doppelrührwerk auszubilden, in welterpressen mechanisch entwässert wird, ist es erfor- ehern zwei verschiedene Rührvorrichtungen in verderlich, vor der Aufgabe des Schlammes auf die hältnismäßig langsamer Geschwindigkeit gegenläufig Presse dem Schlamm chemische Flockungsmittel zu- aufeinander bzw. auf den Schlamm einwirken. Allge-Zuführen, welche bewirken, daß die feinst verteilten 65 mein ist dabei ein pendelnder Antrieb der beiden Schlammteilchen sich in der Schlammtrübe zu einzel- Rührwerke vorteilhaft.ireß is carried, with inlets for the sludge and the sen for the flocculant feed, sedimentation means and with an agitator. 60 hen be. It is also particularly useful that For example, with sewage sludge, which should be designed as a double agitator on the FiI chassis, in welterpressen is mechanically dewatered, it is necessary to use two different stirring devices, before adding the sludge to the relatively slower speed in opposite directions Press chemical flocculants onto each other or act on the sludge. General supply, which cause the finely distributed 65 mine is a pendulum drive of the two Sludge particles are advantageous to single agitators in the sludge sludge.
nen Flocken koagulieren. Die jeweilige Art der zuzu- Im einzelnen kann weiterhin die Erfindung nochcoagulate the flakes. The respective type of to- In detail, the invention can still
gebenden Flockungsmittel, ob anionisch oder katio- dadurch ihre vorteilhafte Weiterbildung erfahren,giving flocculants, whether anionic or cationic, experience their advantageous development,
daß dem vertikalen Mischbehälter ein Reaktionsbehälter nachgeschaltet ist, welcher sich in Fließricbtung in seinem Querschnitt gleichfalls vergrößert. Betrieblich für die nachfolgende Auspressung des ausgeflockten Schlammes ist es dabei vorteilhaft, den Reaktionsbehälter mit einer Überlaufkante für die Aufgabe des Schlammes in breitet Ausdehnung auf eine nachgeschaltete Filterpresse zu versehen, wobei diese Überlaufkante mit beonderem Vorteil mit einer Schichtreguliervorrichtuag einen breiten Durchirittsschlitz als Aufgabe für den Schlamm auf die Presse bildet.that the vertical mixing vessel is a reaction vessel is downstream, which also increases in flow direction in its cross-section. Operational for the subsequent pressing out of the flocculated sludge, it is advantageous to use the Reaction tank with an overflow edge for the task of the sludge in spreads out to provide a downstream filter press, this overflow edge with a particular advantage Stratification device has a wide opening as a job for the sludge on the press forms.
Die Erfindung wird an einem Ausführungsbeispiel erläutert. Es zeigtThe invention is explained using an exemplary embodiment. It shows
F i g. 1 einen Mischbehälter im Längsschnitt, F i g. 2 in Draufsicht,F i g. 1 shows a mixing container in longitudinal section, FIG. 2 in plan view,
Fig.3 im Querschnitt in der Ebene der Linie III-III und3 in cross section in the plane of the line III-III and
Fig.4 die Anordnung eines Mischbehälters an einer Trommelfüterpresse. ob4 shows the arrangement of a mixing container a drum feed press. if
In der zeichnerischen Darstellung wird einem kegelig ausgebildeten Mischbehälter 2 der zu behandelnde Rohschlamm am Boden des Behälters über den Stutzen 1 zugeführt Das Volumen des Mischbehälters erweitert sich also ständig in Strömungsrichtung des aus dem Zulauf 1 im Behälter 2 aufsteigenden Schlammes. Ein allgemein mit 3 bezeichnetes Rührwerk ist innerhalb des Mischbehälters 2 angeordnet und besteht im einzelnen aus einer Hohlwelle 4 mit Seitenarmen 9 sowie einem Gegenkorb 10 mit Seitenarmen 11.In the drawing, a conical mixing container 2 is to be treated Raw sludge fed to the bottom of the container via the nozzle 1 The volume of the mixing container thus expands constantly in the direction of flow of the rising from the inlet 1 in the container 2 Mud. An agitator, generally designated 3, is arranged inside the mixing container 2 and consists in detail of a hollow shaft 4 with side arms 9 and a counter basket 10 with side arms 11.
Über die Hohlwelle 4 wird das Flockungsmittel am oberen Ende der Hohlwelle eingegeben und erreicht das Behälterinnere am unteren Ende des Behälters gegenüber der Eintrittsöffnung für den Schlamm über beispielsweise drei Arme 5, die verschieden lang ausgebildet sind und somit mit den an Omen angeordneten Austrittsdüsen für das Flockungsmittel verschiedene Kreisringflächen innerhalb des Mischbehälters bestreichen und so das Flockungsmittel bei gleichzeitiger Drehung der Hohlwelle über einen weiten Reaktionsbereich spontan mit dem Schlamm in Berührung bringen.The flocculant is entered and reached via the hollow shaft 4 at the upper end of the hollow shaft the inside of the container at the lower end of the container opposite the inlet opening for the sludge via, for example, three arms 5, which are of different lengths and thus arranged with the omen Outlet nozzles for the flocculant have various circular ring areas within the mixing tank coat and so the flocculant with simultaneous rotation of the hollow shaft over a wide area Bring the reaction area into contact with the sludge spontaneously.
Von einem Motor 12 werfen die Hohlwelle und der Korb mit ihren Armen 9 und 11 über einen Kurbelantrieb 13 in eine pendelnde hin- und hergehende Bewegung versetzt, ähnlich wie ein Scheibenwischer. Hierdurch kann die Bewegung der Arme 9 und 11 langsam bemessen werfen, so daß eine Zerstörung der bereits gebildeten Flocken durch eine zu intensive Ruhreinwirkung verhindert wird. Darüber hinaus haben die Flocken für ihre Bildung durch den sich nach oben erweiternden Querschnitt des Mischbehälters 2 einen wachsenden Raum zu ihrer Verfügung. From a motor 12, the hollow shaft and the basket throw with their arms 9 and 11 via a crank drive 13 set in an oscillating back and forth movement, similar to a windshield wiper. This allows the movement of the arms 9 and 11 to throw slowly, so that destruction the already formed flakes is prevented by too intensive a stirring action. Furthermore the flakes are responsible for their formation through the upwardly widening cross-section of the mixing container 2 a growing space at your disposal.
An den Behälter 2 schließt sich nach oben ein Reaktionsbehälter 6 mit gleichfalls sich erweiterndem Querschnitt an. Der Reaktionsbehälter 6 ist vorteilhaft mit einer Überlaufkante 7 versehen, welche mit einer Schichtregulierungseinrichtung 8, welche wie durch Pfeile angedeutet (Fig.4) hin- und her zur Regelung der Schichtdicke verschoben werfen kann, einen breiten und gleichmäßig dicken Austrittsquerschnitt für den geflockten Schlamm bildet beispielsweise auf das obere Filterband 14 einer in Fig.4 schematisch dargestellten Trommelfüterpresse.At the top of the container 2, a reaction container 6 closes with a likewise widening one Cross-section. The reaction container 6 is advantageously provided with an overflow edge 7, which with a layer regulation device 8, which as indicated by arrows (Figure 4) back and forth to Regulation of the layer thickness shifted can throw a wide and evenly thick exit cross-section for the flocculated sludge, for example, one in FIG. 4 forms on the upper filter belt 14 drum feed press shown schematically.
Hierzu 2 Blatt ZeichnungenFor this purpose 2 sheets of drawings
Claims (9)
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2343323A DE2343323C2 (en) | 1973-08-28 | 1973-08-28 | Mixing tank for the continuous addition and mixing of flocculants to sludge, especially sewage sludge |
JP48110604A JPS5045461A (en) | 1973-08-28 | 1973-10-03 | |
ES423727A ES423727A1 (en) | 1973-08-28 | 1974-02-28 | Mixing dispensers for mixing flocculant with sludge |
GB1388974A GB1470681A (en) | 1973-08-28 | 1974-03-28 | Mixing dispensers for mixing flocculant with sludge |
AT430274A AT328989B (en) | 1973-08-28 | 1974-05-24 | MIXING CONTAINER FOR CONTINUOUS ADDITION AND MIXING OF FLOCKING AGENTS TO SLUDGE |
IT24143/74A IT1015182B (en) | 1973-08-28 | 1974-06-19 | DEVICE FOR THE FEEDING AND MIXING OF FLOCCULATOR MEDIA WITH MUD, IN PARTICULAR PURIFIER MUD OR SIMILAR, TO BE SQUEEZED ON FILTERS. |
CH1138174A CH590682A5 (en) | 1973-08-28 | 1974-08-19 | |
SE7410670A SE7410670L (en) | 1973-08-28 | 1974-08-22 | |
NL7411237A NL7411237A (en) | 1973-08-28 | 1974-08-23 | DEVICE FOR SUPPLYING AND MIXING FLOKING COLORS TO SWALLOW, IN PARTICULAR TO SUBSEQUENTLY PRESSED ON FILTER PRESS SLAGED SWALLOW OR THE LIKE. |
BE147933A BE819229A (en) | 1973-08-28 | 1974-08-27 | DEVICE FOR SUPPLYING FLOCCULATING AGENTS TO THE SLUDGE AND FOR MIXING THEM WITH IT |
FR7429364A FR2242138B3 (en) | 1973-08-28 | 1974-08-28 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2343323A DE2343323C2 (en) | 1973-08-28 | 1973-08-28 | Mixing tank for the continuous addition and mixing of flocculants to sludge, especially sewage sludge |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2343323B1 DE2343323B1 (en) | 1975-01-16 |
DE2343323C2 true DE2343323C2 (en) | 1975-08-21 |
Family
ID=5890920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2343323A Expired DE2343323C2 (en) | 1973-08-28 | 1973-08-28 | Mixing tank for the continuous addition and mixing of flocculants to sludge, especially sewage sludge |
Country Status (11)
Country | Link |
---|---|
JP (1) | JPS5045461A (en) |
AT (1) | AT328989B (en) |
BE (1) | BE819229A (en) |
CH (1) | CH590682A5 (en) |
DE (1) | DE2343323C2 (en) |
ES (1) | ES423727A1 (en) |
FR (1) | FR2242138B3 (en) |
GB (1) | GB1470681A (en) |
IT (1) | IT1015182B (en) |
NL (1) | NL7411237A (en) |
SE (1) | SE7410670L (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2354293A2 (en) * | 1975-08-19 | 1978-01-06 | Alsthom Cgee | PROCESS FOR COMPACTING AND SPINING FLUID SLUDGE LOADED WITH FIBROUS MATERIALS |
AU524927B2 (en) * | 1977-10-17 | 1982-10-14 | Somat Corp. | Sludge treatment |
DK152015B (en) * | 1979-08-02 | 1988-01-25 | Voest Alpine Ag | DEVICE FOR DEVICING AURAL SUSPENSIONS AND SLAMS WITH A SEBAND PRESSURE AND SPALTESI |
DE3939984A1 (en) * | 1989-12-02 | 1991-06-06 | Unitech Gmbh | Prepn. device for auxiliary flocculant additives - where the additive is mixed as it passes through three chambers provided with agitators mounted on a single shaft |
DE19521835C2 (en) * | 1995-06-16 | 1998-04-16 | Wetzel & Partner Ingenieurgese | Flocculation system |
GB2361915B (en) | 2000-05-05 | 2002-12-24 | Genesis Fluid Solutions Llc | High speed dewatering of slurries |
FR3000906B1 (en) * | 2013-01-15 | 2015-03-06 | Skako Concrete | CONICAL CONVEYOR TANK MIXER |
CN107362727A (en) * | 2017-09-13 | 2017-11-21 | 童永康 | Interactive powder of lacquer putty for use on tempering tank and powder of lacquer putty for use on mixed method |
CN107670532A (en) * | 2017-11-06 | 2018-02-09 | 黄纪春 | A kind of agricultural composite fertilizer processing equipment production equipment |
CN110252023A (en) * | 2019-06-26 | 2019-09-20 | 萍乡市华星环保工程技术有限公司 | Filter device is used in desulfurization waste liquor relieving haperacidity pretreatment |
CN111715096B (en) * | 2020-06-24 | 2022-06-24 | 刘永圣 | Peanut seed coating agent mixer |
CN112723498B (en) * | 2020-11-16 | 2022-09-02 | 福建亿旭能源科技有限公司 | Nanocrystalline magnetic coagulation equipment for heavy metal wastewater treatment |
SE546177C2 (en) * | 2021-04-26 | 2024-06-18 | Valmet Oy | Mixing assembly and method for controlling mixing of green liquor and a flocculation agent |
CN117964106B (en) * | 2023-12-14 | 2024-10-11 | 山东省国土空间生态修复中心(山东省地质灾害防治技术指导中心、山东省土地储备中心) | Sewage treatment system based on advanced deamination dephosphorization technique |
-
1973
- 1973-08-28 DE DE2343323A patent/DE2343323C2/en not_active Expired
- 1973-10-03 JP JP48110604A patent/JPS5045461A/ja active Pending
-
1974
- 1974-02-28 ES ES423727A patent/ES423727A1/en not_active Expired
- 1974-03-28 GB GB1388974A patent/GB1470681A/en not_active Expired
- 1974-05-24 AT AT430274A patent/AT328989B/en not_active IP Right Cessation
- 1974-06-19 IT IT24143/74A patent/IT1015182B/en active
- 1974-08-19 CH CH1138174A patent/CH590682A5/xx not_active IP Right Cessation
- 1974-08-22 SE SE7410670A patent/SE7410670L/xx unknown
- 1974-08-23 NL NL7411237A patent/NL7411237A/en unknown
- 1974-08-27 BE BE147933A patent/BE819229A/en unknown
- 1974-08-28 FR FR7429364A patent/FR2242138B3/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2242138B3 (en) | 1977-06-17 |
GB1470681A (en) | 1977-04-21 |
BE819229A (en) | 1974-12-16 |
CH590682A5 (en) | 1977-08-15 |
AT328989B (en) | 1976-04-26 |
FR2242138A1 (en) | 1975-03-28 |
ATA430274A (en) | 1975-06-15 |
SE7410670L (en) | 1975-03-03 |
IT1015182B (en) | 1977-05-10 |
DE2343323B1 (en) | 1975-01-16 |
JPS5045461A (en) | 1975-04-23 |
ES423727A1 (en) | 1976-04-16 |
NL7411237A (en) | 1975-03-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
E77 | Valid patent as to the heymanns-index 1977 | ||
EHJ | Ceased/non-payment of the annual fee |