DE2540284C3 - Device for the biological purification of wastewater in a body of water, such as a pond or the like - Google Patents

Device for the biological purification of wastewater in a body of water, such as a pond or the like

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Publication number
DE2540284C3
DE2540284C3 DE2540284A DE2540284A DE2540284C3 DE 2540284 C3 DE2540284 C3 DE 2540284C3 DE 2540284 A DE2540284 A DE 2540284A DE 2540284 A DE2540284 A DE 2540284A DE 2540284 C3 DE2540284 C3 DE 2540284C3
Authority
DE
Germany
Prior art keywords
water
cover
flow path
partition walls
wastewater
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
Application number
DE2540284A
Other languages
German (de)
Other versions
DE2540284A1 (en
DE2540284B2 (en
Inventor
Karla 8390 Passau Fischer
Kurt 8391 Kellberg Leistner
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Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE19742418586 priority Critical patent/DE2418586C3/en
Priority claimed from DE19742418586 external-priority patent/DE2418586C3/en
Application filed by Individual filed Critical Individual
Priority to DE2540284A priority patent/DE2540284C3/en
Publication of DE2540284A1 publication Critical patent/DE2540284A1/en
Publication of DE2540284B2 publication Critical patent/DE2540284B2/en
Application granted granted Critical
Publication of DE2540284C3 publication Critical patent/DE2540284C3/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1257—Oxidation ditches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
    • B01F23/454—Mixing liquids with liquids; Emulsifying using flow mixing by injecting a mixture of liquid and gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/06—Aerobic processes using submerged filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/103—Textile-type packing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1294—"Venturi" aeration means
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2806—Anaerobic processes using solid supports for microorganisms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • 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
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Biological Treatment Of Waste Water (AREA)

Description

Die Erfindung betrifft eine Einrichtung /ur biologischen Reinigung von Abwasser mit den Merkmalen nach dem Oberbegriff des Anspruches I.The invention relates to a device / ur biological Purification of sewage with the features according to the preamble of claim I.

Eine derartige Einrichtung ist Gegenstand des nicht vorveröffentlichten Patents 24 18 58b. In dieser Einrichtung soll der biologische Abbau möglichst aerob erfolgen.Such a device is the subject of the unpublished patent 24 18 58b. In this facility biodegradation should take place as aerobically as possible.

Dlt Erfindung liegt die Aufgabe zugrunde, eine Einrichtung mit dem in dem Patent 24 18 ">8b aufgezeigten Prinzip der künstlichen Schaffung von Eliellsirecken so auszubilden, daß in dieser Voraussetzungen auch für einen anaeroben Abbau geschaffen werden.The invention is based on the object of a Device with that shown in the patent 24 18 "> 8b Principle of the artificial creation of Eliellsi corners to be trained in such a way that in these prerequisites also for anaerobic degradation can be created.

Diese Aufgabe wird bei einer Einrichtung der eingangs genannten Art crfindungsgemäl.! mit den im kennzeichnenden Teil des Anspruches I enthaltenen Merkmalen gelöst.This task is accomplished according to the invention with a device of the type mentioned at the beginning. with the im Characteristic part of claim I contained features solved.

Vorteilhafte Ausgestaltungen sind Gegenstand der .'nleranspriiche.Advantageous refinements are the subject of the claims.

Alisführungsbeispiele der Erfindung sind in der /eii.hniing dargestellt, die nachstehend näher erläutert wird. Es zeigtExamples of implementation of the invention are shown in the /eii.hniing, which is explained in more detail below will. It shows

I ι μ, I eine iitiiiemhc !liwLisi recke im (jncrsi liniu.I ι μ, I a iitiiiemhc! LiwLisi recke im (jncrsi liniu.

I ι g. 2 eine /weischichl Fiiel.tstreikc im Oiierschnitl inulI ι g. 2 a / weischichl fiiel.tstreikc in the Oiierschnitl inul

I ig- 5 den Längsschnitt hierzu.I ig- 5 the longitudinal section on this.

I if I 'eigl den (,Jin'rvhiiit' eines leirhes mit ,in.tei'"bcr I 'lii.'ßslP'cke im Si hi'inaI if I 'eigl den (, Jin'rvhiiit' of a loan with , in.tei '"bcr I' lii.'ßslP'cke in Si hi'ina

D.ι1. I eichwasser «.in! dui'eh ! h.'NI!» .irid1.1 ! in eine ii'.'iiM reck e aiilgclcilt. Hwivh Al^t ί ■ ■ t kiiiii'rn 2 ,ihgedun ■ ■!: nil·! durch lediglich mii \ju--i 1J. ill,'.-mein VVassn oder Schlammwasser betriebene Sirahlvorrichlungen 3 bewegt und gemischt. Für das Ansiedeln einer erwünschten Schicht von biologischem Rasen sind an den Trennwänden 1 und unter den Abdeckungen 2 ri Haftflächen 4, zum Beispiel Bahnen aus grobmaschigem Gewebe, wie Raschelgewebe aus Kunststoffstreifen, angebracht.D. 1 . I calibrated water «.in! dui'eh! h.'NI! " .irid 1 . 1 ! in a ii '.' iiM horizontal bar e aiilgclcilt. Hwivh Al ^ t ί ■ ■ t kiiiii'rn 2 , ihgedun ■ ■ !: nil ·! by only mii \ ju - i 1 year ill, '.- my VVassn or sludge water operated Sirahlvorrichlungen 3 moved and mixed. For the settlement of a desired layer of biological turf, adhesive surfaces 4, for example webs of coarse-meshed fabric, such as Raschel fabric made of plastic strips, are attached to the partition walls 1 and under the covers 2 r i.

Die Fig. 2 und 3 zeigen die Kombination einer anaeroben Fließstrecke nach Fig. 1 mit einer aeroben ίο Fließstrecke. Die Abdeckungen 5 liegen beispielsweise in halber Höhe des Fließquerschnittes und teilen diesen in eine untere anaerobe und eine obere aerobe FlieQstreckeauf.FIGS. 2 and 3 show the combination of an anaerobic flow path according to FIG. 1 with an aerobic one ίο flow section. The covers 5 are for example halfway up the flow cross-section and divide it into a lower anaerobic and an upper aerobic Flow distance up.

Wie im Längsschnitt in F i g. 3 dargestellt, können die rs ,-.bdeckungen 5 aus einzelnen schräg liegenden und sich überlappenden Platten 6 bestehen. Die schräg liegenden, sich überlappenden Platten 6 dunkeln die untere Fließstrecke ab, der in der oberen Fließsirecke entstehende Schlamm 7 kann auf ihnen nach unten ^i abrutschen, in der unteren Fließsirecke entstandene Gasulasen 8 können unter ihnen zur oberen Hießstrekke aufsteigen. Das Wasser der unteren Fließstrecke wird durch die Strahlvorrichtungen 3 von sauerstoffarmem Wasser oder Schlammwasser bewegt und .'■■> gemischt, das Wasser der oberen Fließstrecke durch Luft-Wasscr-Strahlen 9 bewegt, gemischt und belüftet.As in the longitudinal section in F i g. As shown in 3, the rs, -. 5 covers can consist of individual inclined and self overlapping plates 6 exist. The inclined, overlapping plates 6 darken the lower one The flow section, the sludge 7 that is formed in the upper flow siren, can go down on them ^ i slip off, resulting in the lower ridge Gasulases 8 can take them to the upper hot line rising up. The water in the lower flow path is depleted of oxygen by the jet devices 3 Water or muddy water moves and. '■■> mixed, the water of the upper flow section moved by air-water jets 9, mixed and aerated.

Vorgenannte Mittel bewirken in der unteren I ließstrecke eine anaerobe, in der oberen Fließstrecke eine aerobe biologische Reinigung, die gleichzeitig erfolgen. i'i Wird die Abdunkolung an einer Stelle des Umlaufes unterbrochen, kann das Wasser der unteren f ließstrekkc wieder mit dem Wasser der oberen gemischt werden.The aforementioned agents cause an anaerobic flow in the lower flow section and one in the upper flow section aerobic biological cleaning that takes place at the same time. i'i Will the darkening at one point of the circuit interrupted, the water from the lower flow section can be mixed again with the water from the upper one.

Auch denkbar ist es, mehr als zwei Schichten innerhalb eines Fließquerschnittes vorzusehen.
'·' Vorteilhaft abgedunkelt wird mit Leicht platten oder versteiften undurchsichtigen folien, die so befestigt sind, daß sie mit geringem Aufwand ein- und ausgebaut oder verschoben werden können.It is also conceivable to provide more than two layers within a flow cross-section.
'·' It is advantageous to use light-weight panels or stiffened, opaque foils that are fixed in such a way that they can be installed, removed or moved with little effort.

Die Abdeckung der Fließstrecke kann auf deren ganzen Länge oder nur auf einem Teil der Länge erfolgen.The cover of the flow path can be on their entire length or only part of the length.

Die Strömung in der linieren und oberen Fließstrecke kann gleich oder entgegengesetzt gerichtet sein. Das Rohabwasser fließt vorteilhaft in die untere lüeßstrck-'' ke ein und gereinigt aus der oberen Fließstrecke ab.The flow in the lined and upper flow sections can be the same or opposite. The raw sewage flows advantageously into the lower lüeßstrck- '' ke in and cleaned out of the upper flow section.

Die Abdeckungen aus leichten Planen oder versteif ten folie η oder Stoffbahnen können von den Trennwänden oder von eigener Verankerungen gehallen werden. Die Abdeckungen können auch mit einer, oder zwei '' Trennwänden ein Stück bilden.The covers made of light tarpaulin or stiffened foils η or lengths of fabric can be removed from the partition walls or be echoed by their own anchorages. The covers can also come with one, or two '' Form partitions in one piece.

Ubereinandergelegte und in Streifen verbundeneOverlaid and connected in strips

Folien oder Stoffbahnen können, wie eine Luftmatratze, durch Aufblasen von Rippen mil Luft versteift und stark schwimmfähig, oder mit Wasser und wenig DruckluftFoils or lengths of fabric can, like an air mattress, Stiffened and buoyant by inflating ribs with air, or with water and little compressed air

•' versteift und gering schwimmfähig gemacht werden. • ' stiffened and made less buoyant.

Ohne Luft und Wasser sind sie zusammenlegbar und können leicht transportiert werden.Without air or water, they can be collapsed and easily transported.

In der unteren I ließsuecke sammelt sich aller Schlamm und bleibt, mehr oder weniger abgebaut dort "' um Hoden liefen. Um ihn zu entfernen werden die Abdeckungen und. soweit erlorderlich. auch die ftennwaride ausgebaut, oder verschoben, was zum Beispiel son einem Schlauchboot aus erfolgen kann.Everything gathers in the lower settee Mud and remains, more or less broken down there '' 'ran around testicles. To remove it are the Covers and. as far as necessary. also the ftennwaride expanded, or moved what to Example son can be made from an inflatable boat.

Wird in einem l'eich nur eine '[ eillänge der sonst ' aeroben I hcltsti ecke auch anaerob betrieben, so kann es \ 1O! teilhall sein, den ,\tv i ml·' diesel I lielKtieeke ankommenden Schlamm mn einer Pumpe wieder aπ/ι!sauren und ant AnIaMi' <.U r ,ιη.κ'Π ihrii I lirlKtrvrki·Is in a l'verifiable only one '[eillänge the otherwise' aerobic I hcltsti corner operated anaerobically, so it can \ 1 O! be part of the , \ tv i ml · 'diesel I lielKtieeke incoming sludge with a pump again aπ / ι! acidic and ant AnIaMi'<.U r, ιη.κ'Π ihrii I lirlKtrvrki ·

3 43 4

jcr einzubringen. gemacht werden, so dall der Düsenstrahl nacheinanderjcr. be made so that the jet streams one after the other

lfolge seiner größeren Trägheit läßt sich Schlamm eine gewünschte Flache des Hießquerschnittes be-Due to its greater inertia, the sludge can have a desired area of the hot cross-section.

verer bewegen und mischen als Wasser. Um den sich streicht.verer move and mix than water. To which it strokes.

igcrndcn Schlamm im ganzen Fließquerschnitt Die Strahlvorrichtung kann außerdem längs ierschu-igcrndcn sludge in the entire flow cross-section.

Jer anzustoßen, kann die Düse für den treibenden j ben oder versetzt werden.To bump jer, the nozzle for the driving j can ben or be relocated.

ihl — wie bei einem Rasensprenger — beweglichihl - like a lawn sprinkler - movable

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (5)

Patentansprüche:Patent claims: 1. Einrichtung zur biologischen Reinigung von Abwasser in einem Gewässer, wie Teich od. dgl., mit in dem Gewässer eingesetzten Trennwänden, durch die die Gewässerfläche in eine längliche Fließstrecke aufgeteilt ist, und mit in Abständen angeordneten Strahlvorrichtungen, durch die die Wassermasse in der durch die Trennwände gebildeten künstlichen Fließstrecke in eine horizontale Strömung versetzbar ist, dadurch gekennzeichnet, daß mindestens ein Teil der Fließstrecke durch wenigstens eine Abdeckung (2, 5) abgedunkelt ist und die Wassermasse in der unter der Abdeckung (2, 5) befindlichen Wasserschicht durch lediglich mit sauerstoffarmem Wasser betriebene Strahlvorrichtungen (3) in Bewegung gesetzt ist.1. Device for the biological purification of wastewater in a body of water, such as a pond or the like., With Partition walls used in the water, through which the water surface in an elongated flow path is divided, and with spaced jet devices through which the water mass in the artificial flow path formed by the partition walls can be moved into a horizontal flow is, characterized in that at least part of the flow path through at least a cover (2, 5) is darkened and the water mass in the under the cover (2, 5) located water layer through jet devices operated only with low-oxygen water (3) is set in motion. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die gesamte Fließstrecke abgedeckt ist.2. Device according to claim 1, characterized in that the entire flow path is covered. 3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, düß die Abdeckung (2) nahe· dci Wasseroberfläche angeordnet ist.3. Device according to claim 1 or 2, characterized in that the cover (2) is close · dci Water surface is arranged. 4. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Abdeckung (5) unterhalb der Wasseroberfläche, beispielsweise in halber Wassertiefc angeordnet ist.4. Device according to claim 1 or 2, characterized in that the cover (5) below the water surface, for example, is arranged in half the water depth. 5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Abdeckung (5) aus einzelnen kürzeren schräg und überlappt angeordneten Teilen. /. B. Platten (6), gebildet ist.5. Device according to claim 4, characterized in that the cover (5) consists of individual shorter parts arranged obliquely and overlapped. /. B. plates (6) is formed. b. Einrichti *g nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß <lie Trennwände (1) und die Abdeckung (2, 5) Haftflächen (4) für biologischen Rasen aufweisen. b. Device according to one of Claims 1 to 5, characterized in that the partition walls (1) and the cover (2, 5) have adhesive surfaces (4) for biological turf.
DE2540284A 1974-04-18 1975-09-10 Device for the biological purification of wastewater in a body of water, such as a pond or the like Expired DE2540284C3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19742418586 DE2418586C3 (en) 1974-04-18 Device for the biological purification of wastewater in a body of water, such as a pond or the like
DE2540284A DE2540284C3 (en) 1974-04-18 1975-09-10 Device for the biological purification of wastewater in a body of water, such as a pond or the like

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19742418586 DE2418586C3 (en) 1974-04-18 Device for the biological purification of wastewater in a body of water, such as a pond or the like
DE2540284A DE2540284C3 (en) 1974-04-18 1975-09-10 Device for the biological purification of wastewater in a body of water, such as a pond or the like

Publications (3)

Publication Number Publication Date
DE2540284A1 DE2540284A1 (en) 1977-03-17
DE2540284B2 DE2540284B2 (en) 1979-02-22
DE2540284C3 true DE2540284C3 (en) 1979-10-11

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DE2540284A Expired DE2540284C3 (en) 1974-04-18 1975-09-10 Device for the biological purification of wastewater in a body of water, such as a pond or the like

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5861095A (en) * 1997-04-09 1999-01-19 Lemna Corporation Method and device for treating wastewater
WO1999065829A1 (en) * 1998-06-17 1999-12-23 Owens Corning Aerated pond wastewater treatment system and process

Also Published As

Publication number Publication date
DE2540284A1 (en) 1977-03-17
DE2418586A1 (en) 1975-11-13
DE2418586B2 (en) 1977-06-02
DE2540284B2 (en) 1979-02-22

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Date Code Title Description
OI Miscellaneous see part 1
C3 Grant after two publication steps (3rd publication)
8339 Ceased/non-payment of the annual fee