GB2164264A - Air diffusion unit for sewage treatment plant - Google Patents
Air diffusion unit for sewage treatment plant Download PDFInfo
- Publication number
- GB2164264A GB2164264A GB8520028A GB8520028A GB2164264A GB 2164264 A GB2164264 A GB 2164264A GB 8520028 A GB8520028 A GB 8520028A GB 8520028 A GB8520028 A GB 8520028A GB 2164264 A GB2164264 A GB 2164264A
- Authority
- GB
- United Kingdom
- Prior art keywords
- air
- tube
- sewage
- air supply
- connector assembly
- 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.)
- Withdrawn
Links
- 239000010865 sewage Substances 0.000 title claims abstract description 43
- 238000009792 diffusion process Methods 0.000 title claims description 30
- 239000010802 sludge Substances 0.000 claims abstract description 13
- 238000005273 aeration Methods 0.000 claims description 14
- 238000009395 breeding Methods 0.000 claims description 5
- 230000001488 breeding effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 244000005700 microbiome Species 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 4
- 230000003449 preventive effect Effects 0.000 claims description 3
- 230000000274 adsorptive effect Effects 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 claims description 2
- 238000005276 aerator Methods 0.000 claims 2
- 239000002184 metal Substances 0.000 claims 1
- 239000012858 resilient material Substances 0.000 claims 1
- 239000000919 ceramic Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000012840 feeding operation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000010959 steel 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/20—Activated sludge processes using diffusers
-
- 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
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2311—Mounting the bubbling devices or the diffusers
-
- 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
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2311—Mounting the bubbling devices or the diffusers
- B01F23/23114—Mounting the bubbling devices or the diffusers characterised by the way in which the different elements of the bubbling installation are mounted
- B01F23/231143—Mounting the bubbling elements or diffusors, e.g. on conduits, using connecting elements; Connections therefor
-
- 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
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23123—Diffusers consisting of rigid porous or perforated material
-
- 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
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231265—Diffusers characterised by the shape of the diffuser element being tubes, tubular elements, cylindrical elements or set of tubes
-
- 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
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
The air diffuser tube (2) is secured by a rod (9) to the flange portion (4) of the connector assembly (6), and the air supply tube (7) communicates with the tube portion (5) of the connector assembly (6). An orifice member (10) having an orifice (10a) is disposed in the tube portion (5) of the connector assembly (6) to define an air supply chamber (11) between the orifice member (10) and the flange portion (4) and a ball member (12) capable of openably closing the orifice (10a) is disposed in the air supply chamber (11). In the event of backflow of sewage from the air diffuser tube (2), the ball member (12) is urged by the stream of sewage to close the orifice (10a) thereby preventing flowing of sewage toward and into the air supply pipe (7) and restricting the flow of sewage into the air diffuser tube (2) to prevent clogging of the air diffuser tube by sludge. <IMAGE>
Description
SPECIFICATION
Device for Preventing Clogging of Air Diffuser Tube
Background of the Invention
This invention relates to an air diffusion unit including an air diffuser tube of a porous ceramic or plastic material connected to an air supply tube, and more particularly to a device for preventing backflow of sewage from the air diffuser tube toward and into the air supply tube in the event of interruption of supply of compressed air from the air supplytube to the air diffusertube, thereby preventing clogging of the air diffuser tube tending to occur due to the backflow of sewage from the air diffuser tube into the air supply tube.
As one sewage disposal processes, there is an activated sludge process. According to this activated sludge process, air is blown into an aeration tank storing sewage containing organic matter thereby causing breeding of microorganisms in the sewage, and sludge formed in the sewage as a result of breeding of the microorganisms settles in the form of adsorptive flocs to leave a treated transparent liquid in the tank. In this activated sludge process, an air diffusion unit is used for diffusing air into sewage stored in the aeration tank.
In the air diffusion unit, a connector assembly including a tube portion and a flange portion formed with a single or a plurality of communication openings disposed on the same circumference is connected at its flange portion with an air diffuser tube made of a porous ceramic or plastic material and at its tube portion with an air supply tube supplying compressed air discharged from a blower. The compressed air discharged from the blower into the air supply tube flows through the tube portion of the connector assembly and through the communication opening or openings of the flange portion into the air diffuser tube.
A plurality of such air diffusion units each having a structure as described above are disposed on the inner bottom of an aeration tank storing sewage.
When compressed air from the blower is fed into the air diffuser tubes of the air diffusion units in the tank, bubbles of air are diffused into the sewage from the air diffuser tubes to assist in the breeding of the microorganisms in the sewage.
When the air diffusion units are'operating and compressed air is fed into the air diffuser tubes and the pressure of air in the air diffuser tubes is high enough to prevent intrusion of sewage into the air diffuser tubes.
However, when feeding of compressed air from the blower into the air supply tubes is suddenly interrupted due to, for example, sudden power failure or breakdown of the blower, sewage intrudes into the air diffuser tubes and flows back through the communication openings of the connector assembly into the air supply tubes, and the sewage will finally accumulate in the air supply tubes up to the horizontal level of the tank. Therefore, when feeding of compressed air from the blower into the air supply tubes is to be restarted, it is necessary to discharge the sewage accumulating in the air supply tubes.
However, a large amount of sludge is contained in the sewage accumulating in each of the air supply tubes, and such sludge flows instantaneously into the associated air diffuser tubes as a result of backflow of the sewage into the air diffuser tube.
Since the sewage is only gradually discharged from each of the air diffuser tubes when feeding of compressed air from the blower is restarted, the sludge will remain in each of the air diffuser tubes at the time of restarting the air feeding operation.
Consequently, the blower is forced to operate under an overloaded condition at the time of restarting the air feeding operation, since the air diffuser tubes are clogged by the sludge, and sewage remains still in the air diffuser tubes as well as in the air supply tubes. Further, the connector assembly connected at its flange portion with each of the air diffuser tubes is formed at its flange portion with the single or plural communication openings disposed on the same circumference. Therefore, the angular positions of the communication openings of the plural air diffusion units disposed in the aeration tank are displaced from one another depending on the mounted angles of the connector assemblies, and the individual air diffuser tubes connected with the associated air supply tubes through the connector assemblies have different resistances against air respectively.This leads to the disadvantage that the amounts of air supplied from the air supply tubes to the air diffuser tubes of the plural air diffusion units disposed in the aeration tank are not the same.
Brief Summary of the Invention
It is an object of the present invention to provide a device for preventing backflow of sewage from an air diffuser tube into an air supply tube in an air diffusion unit in the event of interruption of supply of air from the air supply tube to the air diffuser tube, thereby preventing clogging of the air diffuser tube tending to occur due to the backflow of sewage from the air diffuser tube into the air supply tube.
Another object of the present invention is to make uniform the resistance against air flowing from air supply tubes to air diffuser tubes of a plurality of air diffusion units disposed in an aeration tank, so that air bubbles can simultaneously emerge from all the air diffuser tubes, and all the air diffuser tubes can generate and diffuse air bubbles at a uniform pressure.
In accordance with the present invention which attains the above object, there is provided, in an air diffusion unit including an air supply tube, an air diffuser tube, and a connector assembly connecting the air supply tube with the air diffuser tube and including a tube portion and a flange portion formed with at least one communication opening, a device for preventing clogging of the air diffuser tube, comprising a rod in screw threaded engagement with the flange portion of the connector assembly for securing the air diffuser tube in position, an orifice member disposed in the tube portion of the connector assembly communicating with the air supply tube to define an air supply chamber tube portion between the orifice member and the flange portion, and a spherical member disposed in the air supply chamber so as to openably close an orifice of the orifice member.
The above and other objects and feature of the present invention will appear more fully hereinafter from a consideration of the following description taken in connection with the accompanying drawing wherein an embodiment is illustrated by way of example.
Brief Description of the Drawing
The figure is a schematic sectional view of an air diffusion unit comprising an embodiment of a device for preventing clogging of an air diffusertube according to the present invention.
Detailed Description of the Preferred Embodiment
An embodiment of the present invention will now be described in detail with references to the drawing. Referring to the figure, an air diffusion unit comprising a device for preventing clogging of an air diffuser tube, according to the present invention is generally designated by the reference numeral 1.
A plurality of such air diffusion units 1 are disposed on the inner bottom of an aeration tank (not shown) of a sewage treatment plant such as a drain treatment plant. The air diffusion unit 1 includes an air diffuser tube 2 made of a ceramic or like material, a connector assembly 6 comprising a tube portion 5 and a flange portion 4 formed with at least one communication opening 3, and an air supply tube 7 connected or communicating with a blower (not shown).
An end plate 8 is fixed to one end of the air diffuser tube 2, and a rod 9 is fixed fluid-tight at one end thereof to the end plate 8 to extend into the air diffuser tube 2. The flange portion 4 of the connector assembly 6 is fixed fluid-tight in the other end of the air diffuser tube 2, and the other end of the rod 9 is in screw threaded engagement with the flange portion 4 of the connector assembly 6. An internally threaded portion 5a is formed on the inner wall of the tube portion 5 of the connector assembly 6, and this tube portion 5 communicates with the air supply tube 7 communicating with the blower (not shown).A disc-shaped orifice member 10 having a rubber sheet 5b bonded to its outer wall and having an axially central orifice 10a is screw threaded engaged with the internally threaded portion 5a of the tube portion 5 of the connector assembly 6, so that an air supply chamber 11 is defined between the orifice member 10 and the flange portion 4 of the connector assembly 6. A spherical member such as a ball member 12 made of rubber, glass, or a plastic or steel material having a diameter larger than the diameter of the orifice 10a of the orifice member 10 is freely movably disposed in the air supply chamber 11.The function of this ball member 12 is such that, when compressed air is supplied through the air supply tube 7, the ball member 12 is urged toward the flange portion 4 of the connector assembly 6 to open the orifice 10a of the orifice member 10, but when sewage flows into the air diffuser tube 2 or when the internal pressure of the air diffuser tube 2 rises beyond a limit, the ball
member 12 is urged toward the orifice 10a of the
orifice member 10to close the orifice 10a.
The operation of the air diffusion unit 1 provided with the clogging preventive device embodying the
present invention will now be described.
A plurality of such air diffusion units 1 are disposed horizontally on the inner bottom of an aeration tank of a sewage treatment plant such as a drain treatment plant. When compressed air is supplied from the blower to the air supply tube 7 of each of the air diffusion units 1, the ball member 12 is urged by the compressed air toward the flange portion 4 of the connector assembly 6 to open the orifice 10a of the orifice member 10. Compressed air passes through orifice 1 Oa of the orifice member 10 and through the communication opening 3 into the air diffuser tube 2, and bubbles of air emerge from the air diffuser tube 2.If the supply of air into the air supply tube 7 from the blower is suddenly stopped due to, for example, sudden service interruption or breakdown of the blower, resulting in interruption of air diffusion from the air diffusion unit 1, the internal pressure of the air supply tube 7 drops, and, on the other hand, the internal pressure of the air diffuser tube 2 is raised due to intrusion of sewage into the air diffuser tube 2. Consequently the sewage intrudes into the air supply chamber 11, through the air diffuse tube, and urges the ball member 12 into the aperture 10a. The ball is then pressed to the aperture 10a by the differential pressure between the air supply tube 7 and the air diffuser tube, tube 2 is very slight, and a very slight amount of sludge passes into the air diffuser tube 2 from the aeration tank.As a result, clogging of the air diffuser tube 2 by the sludge is prevented, and the reduced flow of sewage into the air diffuser tube 2 lessens the load of the blower. Also, since no sewage flows into the air supply tube 7, purging of sewage from within the air supply tube 7 by the compressed air is unnecessary at the time of restarting the air diffusion from the air diffusion unit 1, so that the blower can start its operation under a low-loaded condition. The orifice 10a is disposed at the center of the orifice member 10.Therefore, in the plural air diffusion units 1 distributed in the aeration tank, all of the orifices 10a of the orifice members 10 have the same height from the inner bottom of the aeration tank, and the air diffuser tubes 2 of all of the air diffusion units 1 have a constant resistance against air flow, so that compressed air can be uniformly diffused throughout the interior of the aeration tank.
The aforementioned embodiment of the present invention has referred to the use of a disc-shaped orifice member 10, by way of example. It is apparent, however, that the shape of the orifice member 10 is not limited to such a specific one, and any one of various shapes including, for example, an externally-threaded cylindrical shape with a closed bottom having a central orifice may be employed.
It will be understood from the foregoing detailed description that the diffuser-tube clogging preventive device according to the present invention can prevent backflow of sewage from the air diffuser tube toward and into the air supply tube in the event of sudden interruption of air supply from the air supply tube into the air diffuser tube of the air diffusion unit and can also prevent clogging of the air diffuser tube due to backflow of sewage from the air diffuser tube toward and into the air supply tube. Further, according to the present invention, the plural air diffusion units disposed in the aeration tank have the same resistance against the flow of air from the air supply tubes to the air diffuser tubes, and all of the air diffuser tubes can generate air bubbles diffusing under a uniform pressure.
While a preferred embodiment has been described, variations thereto will occur to those skilled in the art within the scope of the present inventive concepts which are delineated by the following claims.
Claims (11)
1. In an air diffusion unit including an air supply tube, an air diffuser tube, and a connector assembly connecting said air supply tube with said air diffuser tube and including a tube portion and a flange portion formed with at least one communication opening, a device for preventing clogging of said air diffuser tube, fixing means for fixing said air diffuser tube to the flange portion of said connector assembly an orifice member disposed in the tube portion of said connector assembly communicating with said air supply tube to define an air supply chamber in said tube portion between said orifice member and said flange portion, and a spherical member disposed in said air supply chamber so as to openably close an orifice of said orifice member.
2. A device as claimed in Claim 1, when said fixing means is a rod in screw threaded engagement with the flange portion of said connector assembly.
3. A device as claimed in Claim 1, wherein said orifice member is in screw threaded engagement with said tube portion of said connector assembly.
4. A device as claimed in Claim 1, wherein said spherical member is made of a resilient material.
5. A device as claimed in Claim 1, wherein said spherical member is made of glass.
6. A device as claimed in Claim 1, wherein said spheical member is made of a metal.
7. A clogging preventive device as claimed in
Claim 1, wherein said spherical member is made of a plastic material.
8. An improved activated sludge process wherein air is diffused into an aeration tank containing sewage with the organic matter for breeding of microorganisms in the sewage and settling the sludge formed in the sewage due to microorganism breeding as adsorptive flocs leaving a treated transparent liquid in the tank, the improvement comprising diffusing the air through at least one diffuser as claimed in any preceding claim.
9. A sewage aerator comprising an air-permeable chamber, an air supply pipe communicating with said air-permeable chamber via an aperture, and valve means arranged to block said aperture and thereby isolate said chamber from said pipe in response to intrusion of sewage into said chamber.
10. Sewage treatment apparatus comprising a sewage treatment tank incorporating at least one air diffusion unit as claimed in any of claims 1 to 7 or 9 and means for supplying compressed air to said diffusion unit.
11. A sewage aerator substantially as described hereinabove with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984123129U JPS6137298U (en) | 1984-08-11 | 1984-08-11 | Air diffuser pipe clogging prevention device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8520028D0 GB8520028D0 (en) | 1985-09-18 |
| GB2164264A true GB2164264A (en) | 1986-03-19 |
Family
ID=14852894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8520028A Withdrawn GB2164264A (en) | 1984-08-11 | 1985-08-09 | Air diffusion unit for sewage treatment plant |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS6137298U (en) |
| KR (1) | KR920008178B1 (en) |
| DE (1) | DE3528555A1 (en) |
| GB (1) | GB2164264A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3639173A1 (en) * | 1986-11-15 | 1988-05-26 | Jaeger Arnold | Device for introducing gas into liquids |
| WO2016064278A1 (en) | 2014-10-20 | 2016-04-28 | Storvik Biofloc As | Diffusor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005052683A (en) * | 2000-10-30 | 2005-03-03 | Hatsumei Kobo:Kk | Apparatus for mixing two fluids |
| CN114377594A (en) * | 2022-01-24 | 2022-04-22 | 洛阳科品实业有限公司 | Decoring system for soluble core |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB605046A (en) * | 1944-07-25 | 1948-07-15 | Activated Sludge Ltd | Improvements in or relating to diffusers for diffusing gases into liquids |
| GB1290312A (en) * | 1970-02-07 | 1972-09-27 | ||
| GB2073602A (en) * | 1980-03-28 | 1981-10-21 | Farrer Activated Sludge Ltd W | Diffuser for aeration and agitation of liquid |
| GB2086745A (en) * | 1980-10-09 | 1982-05-19 | Hawker Siddeley Water Eng | Gas diffuser |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3955527A (en) * | 1974-07-08 | 1976-05-11 | Outboard Marine Corporation | Marine propulsion trim tab with anti ventilation means |
| JPS6246479Y2 (en) * | 1981-03-20 | 1987-12-15 | ||
| JPS6017277Y2 (en) * | 1981-09-25 | 1985-05-27 | 日本碍子株式会社 | Diffuser type air diffuser |
-
1984
- 1984-08-11 JP JP1984123129U patent/JPS6137298U/en active Granted
-
1985
- 1985-07-31 KR KR1019850005527A patent/KR920008178B1/en not_active IP Right Cessation
- 1985-08-08 DE DE19853528555 patent/DE3528555A1/en not_active Withdrawn
- 1985-08-09 GB GB8520028A patent/GB2164264A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB605046A (en) * | 1944-07-25 | 1948-07-15 | Activated Sludge Ltd | Improvements in or relating to diffusers for diffusing gases into liquids |
| GB1290312A (en) * | 1970-02-07 | 1972-09-27 | ||
| GB2073602A (en) * | 1980-03-28 | 1981-10-21 | Farrer Activated Sludge Ltd W | Diffuser for aeration and agitation of liquid |
| GB2086745A (en) * | 1980-10-09 | 1982-05-19 | Hawker Siddeley Water Eng | Gas diffuser |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3639173A1 (en) * | 1986-11-15 | 1988-05-26 | Jaeger Arnold | Device for introducing gas into liquids |
| WO2016064278A1 (en) | 2014-10-20 | 2016-04-28 | Storvik Biofloc As | Diffusor |
| EP3209125A4 (en) * | 2014-10-20 | 2018-11-07 | Storvik Aqua AS | Diffusor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0131358Y2 (en) | 1989-09-26 |
| KR920008178B1 (en) | 1992-09-25 |
| DE3528555A1 (en) | 1986-02-20 |
| KR860001765A (en) | 1986-03-22 |
| JPS6137298U (en) | 1986-03-07 |
| GB8520028D0 (en) | 1985-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |