CA2282445A1 - Strainer insert - Google Patents
Strainer insert Download PDFInfo
- Publication number
- CA2282445A1 CA2282445A1 CA002282445A CA2282445A CA2282445A1 CA 2282445 A1 CA2282445 A1 CA 2282445A1 CA 002282445 A CA002282445 A CA 002282445A CA 2282445 A CA2282445 A CA 2282445A CA 2282445 A1 CA2282445 A1 CA 2282445A1
- Authority
- CA
- Canada
- Prior art keywords
- screening
- belt
- screeningrake
- perforated plates
- screening belt
- 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.)
- Abandoned
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/02—Sediment base gates; Sand sluices; Structures for retaining arresting waterborne material
- E02B8/023—Arresting devices for waterborne materials
- E02B8/026—Cleaning devices
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Filtration Of Liquid (AREA)
- Combined Means For Separation Of Solids (AREA)
- Photoreceptors In Electrophotography (AREA)
- Gasification And Melting Of Waste (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
The invention relates to a method for draining solids in an effluent stream using a belt screen. It is mainly characterized in that the cross-section of the sieving elements in the belt screen is adjusted or controlled. The invention further relates to a strainer insert for implementing the method. The strainer insert has two side chains, (2) between which sieving elements made of a screen plate (3) are sequentially arranged, and is characterized in that each sieving element (3) consists of two screen plates (3a, 3b) which are superposed and shiftable relative to each other.
Description
Screening rakes The invention relates to a process for removing solids from flowing sewage using a screening belt which can be driven and placed in the s flowing sewage and has one link chain at either side with screening elements made of perforated plates extending between the two chains.
The invention further relates to an apparatus for carrying out the process.
Before sewage is clarified in a sewage treatment plant, solids which exceed a pre-defined particle size must be removed mechanically.
1o Processes are known whereby the flowing sewage is fed through a screening rake which retains the solids. These solids must be removed at regular intervals or continuously to prevent the screening rake from becoming clogged.
Different designs of screening rakes or filter rakes are already known.
15 The majority of these screening rakes consist of an endless, driven screening belt revolving like a paternoster, the belt comprising individual screening links, with the gaps between these links forming the screening surface through which the sewage flows.
In addition to screening rakes whose screening elements are made up of 2o groups of adjacent screening links (WO 92/18 221), screening rakes are also known of the type described in the introduction, e.g. from the DE-U
296 19 891, where the screening elements are each formed by a flat perforated plate. These screening rakes with perforated plates have the advantage of their relatively simple structure, making them relatively 2s cheap to manufacture. Also, if there is any damage to the screening elements, it is relatively easy to replace a single perforated plate and a replacement is easy to obtain because the perforated plates are manufactured to a simple design and at low cost, and because the link chains on either side remain in place when individual perforated plates are 3o changed.
Reg. 4013 Ausl 1 On these screening rakes with perforated plates, only the revolving movement of the screening belt can be controlled. If there is a low level of water to be handled, the screening belt is at a standstill for longer periods of time because there is no or only a very slight difference in the water 35 level on both sides of the screening rake. Due to the low flow speed of the water, the material that settles in the sewer is mainly coarse particles and the material reaching the screening belt is almost exclusively fine grain. The greater part of this fine material is flushed through the holes in the perforated plates. This material contains both inorganic and organic 4o substances.
If there is a high level of water, for example after heavy rainfall, the sewer is flushed out due to the high flow speed of the water. The surface of the screening belt becomes covered over very quickly and its control system switches to continuous operation, possibly also to a higher revolving 45 speed, as a result of the difference in water level. When the material in the sewer has been flushed through, there is only a small amount of material left in the water, but the water level remains unchanged for a longer period. The screening belt remains in continuous operation for safety reasons. As a result of the flow pattern, fine material is flushed 5o through the screening belt and thus, is not removed.
The aim of the invention, therefore, is to improve material discharge and to design a screening rake of the type mentioned in the introduction that can meet this requirement.
According to the invention, this task is achieved by the open area of the 55 screening elements in the screening belt being regulated or controlled according to the flow patterns, whereby the flow patterns are recorded by a sensor Reg. 4013 Ausl 21/07 '99 14:52 FA$ +43 318 8902 454 ANDRITZ PATENT -~ MARKS CA f~J004 and the open area can be controlled in relation to the difference in water level upstream and s downstream of the screen, As a result, the screening effect can be influenced such that an optimum removal rate is achieved under all operating conditions occurring.
The screening rake according to the invention is characterised by each screening element consisting of two perforated plates whose edges. over lap and which are movable in relation to one another, and by one of the two pertorated plates being designed as a movable pertorated plate and engaging an adjusting drive at least at one point on the revolving path of the screening belt.
Due to the relative adjustment of the two overlapping pertorated plates, which together form one screening element, the open area of the hole in the screening elements changes. As a result, there is a further means of controlling the screening efficiency in addition to the drive control of the screening rake and permitting optimum adjustment to the conditions pre-veiling in each case_ 2o By changing the gap 'width (size of the holes) in the screening elements, more material is removed in the operating mode for low water level, where . . . the difference in wafer level caused by .reducing the gap width causes the drive of the screening belt to be switched on again, The screening belt removes more material at a smaller gap width, 2s If the water level is rising, the gap width is only enlarged to the extent required for the prevailing operating status. As a result, optimum screen-ing efficiency is still achieved, even at a high water level.
Reg. X4013 Ausl 21107 '.99 14:52 FAg +4J 918 8902 454 ANDRITZ PATENT ~ MARKS CA f~o05 The improved removal rate allows the operator to react more quickly to unexpected weather conditions and further reduces the risk of subsequent pumps and pipes becoming clogged. The operating periods for the screening belt can be optimised such that the material deposited on the rake acts as an additional fine screen and also retains fine particles. This means that larger quantities of organic material can also be washed out and fed to a clarifying process if a washing stage is used after screening.
Advantageous configurations of the invention principle are covered in sub-claims.
1o The invention is described in more detail below in examples and with reference to the drawings, where Fig_ 1 shows part of a fop view of a screening belt in a screening rake for removing solids from flowing sewage, Fig. 2 shows a section through the line marked il-lI in Fig. 1, Fig. 3 shows an enlarged part section through the screening belt in the carrying run and return run, and Fig. 4 shows a partial top view in the direction of the arrow marked IV in Fig. 3.
The screening rack illustrated in Fig, 1 is used to remove solids from 2o flowing sewage. A revolving, driven screening belt 1 has a link chain 2 at either side, with screening elements made of two-layer pertorated pls~tes 3a, 3b between the finks.
One of the two overlapping perforated plates 3a in each screening element is attached, using screws for example, at both ends to a retaining angle 4, which is connected to a fink 2a in the link chain 2. Each retaining angle 4 has a stop plate 5, which rests on the underside of the perforated plate 3 and extends almost over its entire width.
Reg. 4013 Ausl CA 02282445 1999-08-30 r A joint bridging profile 6 is inserted between each of the two longitudinal edges 3c of adjoining perforated plates 3. In the example illustrated, this bridging profile 6 is made of two profile strips 7, each of which are made from a shaped metal strip. The two profile strips 7 are joined together by screws 8 spaced at equal distance. As shown in Fig. 2, each screw 8 is connected to the bottom profile strip 7 at one end, welded for example, while the other end projects through a bore in the top profile strip 7 and is covered by a secured cap nut 9.
A spacer sleeve 10 pushed over the screw 8 and between the two profile strips 7 acts as a distance piece between the two profile strips 7.
Between the two longitudinal edges of the profile strips 7 mounted at equal distances from one another there is one retaining channel 11 on either side of the joint bridging profile 6, each channel holding one of the two longitudinal edges 3c, while still allowing movement and swivel. Each of the two retaining channels 11 of the joint bridging profile 6 is bordered by two lips 12 at the channel inlet. The clear width of the channel inlet is greater than the thickness of the perforated plates 3. The illustration also shows that the retaining channel 11 broadens towards its floor. The inner surfaces of the channel lips 12 which face the perforated plates 3 are 2o convex. This permits the two perforated plates 3 to pivot in relation to one another in the sector where the screening belt is deflected. In addition, the two perforated plates 3a, 3b can be displaced in relation to one another due to the flexible means of securing the longitudinal edges 3c in the retaining channels 11.
As is shown particularly in Fig. 3, each screening element 3 comprises two overlapping perforated plates 3a and 3b, where one of the plates 3b is attached to the link chain 2 as the fixed plate.
_-21107 '.99 14:55 FA$ +49 a18 8902 454. ANDRITZ PATENT -~ S(ARKS CA f~007 An angle 13 is mounted at one end of the movable plate 3a resting on the s _ fixed plate 3b and a guide fork 14 is fitted to the arm 13a of this angle that points outwards. The guide fork 14 runs on a guide rail 15 such that the movable pertorated piste 3a is retained in its pre-set position in relation to the fixed pertorated plate 3b white the screening belt is revolving, for example in a position where the holes 16 in the movable pertorated plate 3a exactly cover the holes 17 in the fried perforated plate 3b. At this setting, illustrated in Fig_ 3, the screening elements 3 have the largest possible gap width.
At a pre--determined point in the revolving path of the screening belt 1, preferably in the return run, the guide fork 14 engages an adjusting section 15a of the guide rail 15, which can be adjusted at right angles to the running direction of the screening be(t_ As shown in Fig. 3, the adjust-ing section 15a is connected to an adjusting drive 19 via a shifting rod 18, for example an air-oil actuated cylinder, which is connected to a control device 20 only shown here in a diagrammatic view. The control device 20 2o can be connected to a sensor 21, which measures the flow pattenl at any given time, for example a device to meter the wafer level upstream and downstream of the screening rake.
The two pertorated plates 3a and 3b are held together at both their longi-tudinal edges by the joint bridging profile 8. In addition to or in place of 2s this joint bridging profile there may also be profile sections 23 inserted in longitudinal holes 22 in the two perforated plates 3a and 3b. The two widened ends of these profile sections 23 extend over the edges of the longitudinal holes 22 and hold the two perforated plates 3a, 3b together.
Reg. 4013 Ausl 21/09 '99 14:59 FAX +4a 51B 8902 454 ANDRiTZ PATENT ~ MARKS CA I~ooB
The adjusting drive 19 changes the gap width of the screening elements by displacing the perforated plates 3a, 3b in relation to one another and thus, it influences the screening efficiency such that an optimum discharge rate is achieved under all operating conditions that may occur.
s If the sensor 21 detects an increase in the difference in water level up-stream and downstream of the screening rake, the screening belt 1 is switched fast of all to continuous operation and possibly also to a higher speed. Only when this measure is not sufficient at the narrow gap setting, as a result of the large volume of water, is the gap width extended by ~o actuating the adjusting device 19_ When the material in the sewer has been flushed through and there is only a little and very fine material carried in the water, but the water level remains high for a longer period, the very high wafer level keeps the screening best running in continuous mode for safety reasons. Only a 15 small amount of fine material is deposited. In order to prevent this material flowing through the screening rake unhindered, as soon as the water level starts to drop; the gap width is reduced in such a way that the fine material can be removed more efficiently.
Reg_ 4013 Ausl 7
The invention further relates to an apparatus for carrying out the process.
Before sewage is clarified in a sewage treatment plant, solids which exceed a pre-defined particle size must be removed mechanically.
1o Processes are known whereby the flowing sewage is fed through a screening rake which retains the solids. These solids must be removed at regular intervals or continuously to prevent the screening rake from becoming clogged.
Different designs of screening rakes or filter rakes are already known.
15 The majority of these screening rakes consist of an endless, driven screening belt revolving like a paternoster, the belt comprising individual screening links, with the gaps between these links forming the screening surface through which the sewage flows.
In addition to screening rakes whose screening elements are made up of 2o groups of adjacent screening links (WO 92/18 221), screening rakes are also known of the type described in the introduction, e.g. from the DE-U
296 19 891, where the screening elements are each formed by a flat perforated plate. These screening rakes with perforated plates have the advantage of their relatively simple structure, making them relatively 2s cheap to manufacture. Also, if there is any damage to the screening elements, it is relatively easy to replace a single perforated plate and a replacement is easy to obtain because the perforated plates are manufactured to a simple design and at low cost, and because the link chains on either side remain in place when individual perforated plates are 3o changed.
Reg. 4013 Ausl 1 On these screening rakes with perforated plates, only the revolving movement of the screening belt can be controlled. If there is a low level of water to be handled, the screening belt is at a standstill for longer periods of time because there is no or only a very slight difference in the water 35 level on both sides of the screening rake. Due to the low flow speed of the water, the material that settles in the sewer is mainly coarse particles and the material reaching the screening belt is almost exclusively fine grain. The greater part of this fine material is flushed through the holes in the perforated plates. This material contains both inorganic and organic 4o substances.
If there is a high level of water, for example after heavy rainfall, the sewer is flushed out due to the high flow speed of the water. The surface of the screening belt becomes covered over very quickly and its control system switches to continuous operation, possibly also to a higher revolving 45 speed, as a result of the difference in water level. When the material in the sewer has been flushed through, there is only a small amount of material left in the water, but the water level remains unchanged for a longer period. The screening belt remains in continuous operation for safety reasons. As a result of the flow pattern, fine material is flushed 5o through the screening belt and thus, is not removed.
The aim of the invention, therefore, is to improve material discharge and to design a screening rake of the type mentioned in the introduction that can meet this requirement.
According to the invention, this task is achieved by the open area of the 55 screening elements in the screening belt being regulated or controlled according to the flow patterns, whereby the flow patterns are recorded by a sensor Reg. 4013 Ausl 21/07 '99 14:52 FA$ +43 318 8902 454 ANDRITZ PATENT -~ MARKS CA f~J004 and the open area can be controlled in relation to the difference in water level upstream and s downstream of the screen, As a result, the screening effect can be influenced such that an optimum removal rate is achieved under all operating conditions occurring.
The screening rake according to the invention is characterised by each screening element consisting of two perforated plates whose edges. over lap and which are movable in relation to one another, and by one of the two pertorated plates being designed as a movable pertorated plate and engaging an adjusting drive at least at one point on the revolving path of the screening belt.
Due to the relative adjustment of the two overlapping pertorated plates, which together form one screening element, the open area of the hole in the screening elements changes. As a result, there is a further means of controlling the screening efficiency in addition to the drive control of the screening rake and permitting optimum adjustment to the conditions pre-veiling in each case_ 2o By changing the gap 'width (size of the holes) in the screening elements, more material is removed in the operating mode for low water level, where . . . the difference in wafer level caused by .reducing the gap width causes the drive of the screening belt to be switched on again, The screening belt removes more material at a smaller gap width, 2s If the water level is rising, the gap width is only enlarged to the extent required for the prevailing operating status. As a result, optimum screen-ing efficiency is still achieved, even at a high water level.
Reg. X4013 Ausl 21107 '.99 14:52 FAg +4J 918 8902 454 ANDRITZ PATENT ~ MARKS CA f~o05 The improved removal rate allows the operator to react more quickly to unexpected weather conditions and further reduces the risk of subsequent pumps and pipes becoming clogged. The operating periods for the screening belt can be optimised such that the material deposited on the rake acts as an additional fine screen and also retains fine particles. This means that larger quantities of organic material can also be washed out and fed to a clarifying process if a washing stage is used after screening.
Advantageous configurations of the invention principle are covered in sub-claims.
1o The invention is described in more detail below in examples and with reference to the drawings, where Fig_ 1 shows part of a fop view of a screening belt in a screening rake for removing solids from flowing sewage, Fig. 2 shows a section through the line marked il-lI in Fig. 1, Fig. 3 shows an enlarged part section through the screening belt in the carrying run and return run, and Fig. 4 shows a partial top view in the direction of the arrow marked IV in Fig. 3.
The screening rack illustrated in Fig, 1 is used to remove solids from 2o flowing sewage. A revolving, driven screening belt 1 has a link chain 2 at either side, with screening elements made of two-layer pertorated pls~tes 3a, 3b between the finks.
One of the two overlapping perforated plates 3a in each screening element is attached, using screws for example, at both ends to a retaining angle 4, which is connected to a fink 2a in the link chain 2. Each retaining angle 4 has a stop plate 5, which rests on the underside of the perforated plate 3 and extends almost over its entire width.
Reg. 4013 Ausl CA 02282445 1999-08-30 r A joint bridging profile 6 is inserted between each of the two longitudinal edges 3c of adjoining perforated plates 3. In the example illustrated, this bridging profile 6 is made of two profile strips 7, each of which are made from a shaped metal strip. The two profile strips 7 are joined together by screws 8 spaced at equal distance. As shown in Fig. 2, each screw 8 is connected to the bottom profile strip 7 at one end, welded for example, while the other end projects through a bore in the top profile strip 7 and is covered by a secured cap nut 9.
A spacer sleeve 10 pushed over the screw 8 and between the two profile strips 7 acts as a distance piece between the two profile strips 7.
Between the two longitudinal edges of the profile strips 7 mounted at equal distances from one another there is one retaining channel 11 on either side of the joint bridging profile 6, each channel holding one of the two longitudinal edges 3c, while still allowing movement and swivel. Each of the two retaining channels 11 of the joint bridging profile 6 is bordered by two lips 12 at the channel inlet. The clear width of the channel inlet is greater than the thickness of the perforated plates 3. The illustration also shows that the retaining channel 11 broadens towards its floor. The inner surfaces of the channel lips 12 which face the perforated plates 3 are 2o convex. This permits the two perforated plates 3 to pivot in relation to one another in the sector where the screening belt is deflected. In addition, the two perforated plates 3a, 3b can be displaced in relation to one another due to the flexible means of securing the longitudinal edges 3c in the retaining channels 11.
As is shown particularly in Fig. 3, each screening element 3 comprises two overlapping perforated plates 3a and 3b, where one of the plates 3b is attached to the link chain 2 as the fixed plate.
_-21107 '.99 14:55 FA$ +49 a18 8902 454. ANDRITZ PATENT -~ S(ARKS CA f~007 An angle 13 is mounted at one end of the movable plate 3a resting on the s _ fixed plate 3b and a guide fork 14 is fitted to the arm 13a of this angle that points outwards. The guide fork 14 runs on a guide rail 15 such that the movable pertorated piste 3a is retained in its pre-set position in relation to the fixed pertorated plate 3b white the screening belt is revolving, for example in a position where the holes 16 in the movable pertorated plate 3a exactly cover the holes 17 in the fried perforated plate 3b. At this setting, illustrated in Fig_ 3, the screening elements 3 have the largest possible gap width.
At a pre--determined point in the revolving path of the screening belt 1, preferably in the return run, the guide fork 14 engages an adjusting section 15a of the guide rail 15, which can be adjusted at right angles to the running direction of the screening be(t_ As shown in Fig. 3, the adjust-ing section 15a is connected to an adjusting drive 19 via a shifting rod 18, for example an air-oil actuated cylinder, which is connected to a control device 20 only shown here in a diagrammatic view. The control device 20 2o can be connected to a sensor 21, which measures the flow pattenl at any given time, for example a device to meter the wafer level upstream and downstream of the screening rake.
The two pertorated plates 3a and 3b are held together at both their longi-tudinal edges by the joint bridging profile 8. In addition to or in place of 2s this joint bridging profile there may also be profile sections 23 inserted in longitudinal holes 22 in the two perforated plates 3a and 3b. The two widened ends of these profile sections 23 extend over the edges of the longitudinal holes 22 and hold the two perforated plates 3a, 3b together.
Reg. 4013 Ausl 21/09 '99 14:59 FAX +4a 51B 8902 454 ANDRiTZ PATENT ~ MARKS CA I~ooB
The adjusting drive 19 changes the gap width of the screening elements by displacing the perforated plates 3a, 3b in relation to one another and thus, it influences the screening efficiency such that an optimum discharge rate is achieved under all operating conditions that may occur.
s If the sensor 21 detects an increase in the difference in water level up-stream and downstream of the screening rake, the screening belt 1 is switched fast of all to continuous operation and possibly also to a higher speed. Only when this measure is not sufficient at the narrow gap setting, as a result of the large volume of water, is the gap width extended by ~o actuating the adjusting device 19_ When the material in the sewer has been flushed through and there is only a little and very fine material carried in the water, but the water level remains high for a longer period, the very high wafer level keeps the screening best running in continuous mode for safety reasons. Only a 15 small amount of fine material is deposited. In order to prevent this material flowing through the screening rake unhindered, as soon as the water level starts to drop; the gap width is reduced in such a way that the fine material can be removed more efficiently.
Reg_ 4013 Ausl 7
Claims (8)
1. Process for removing solids from flowing sewage using a screening belt which can be driven and placed in the flowing sewage, with one link chain at either side which has screening elements made of perforated plates extending between the two chains, characterised by the open area of the screening elements in the screening belt being regulated or controlled.
2. Process according to Claim 1, characterised by the flow patterns being detected by a sensor.
3. Process according to Claim 1 or 2, characterised by the open area being controlled in relation to the difference in water level upstream and downstream of the screen.
4. Screeningrake for removing solids from flowing sewage using a screening belt which can be driven and placed in the flowing sewage, with one link chain at either side which has screening elements made of perforated plates extending between the two chains, characterised by each screening element (3) consisting of two perforated plates (3a, 3b) whose edges overlap and which are movable in relation to one another.
5. Screeningrake according to Claim 4, characterised by one of the two perforated plates (3a, 3b) being designed as a movable perforated plate (3a) and engaging an adjusting drive (19) at least at one point on the revolving path of the screening belt (1).
6. Screeningrake according to Claim 5, characterised by the fixed perforated plate (3b) in each case being attached to the link chain (2).
7. Screeningrake according to Claim 5 or 6, characterised by the movable perforated plate (3a) running on the profile strips (7) and by an adjusting section (15a) of the guide rail (15) being suitable for adjusting at right angles to the running direction of the screening belt (1).
8. Screeningrake according to Claim 7, characterised by the adjusting drive (19) provided being connected to a control device (20).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29703713.7 | 1997-03-01 | ||
| DE29703713U DE29703713U1 (en) | 1997-03-01 | 1997-03-01 | They break |
| PCT/EP1998/001067 WO1998038389A1 (en) | 1997-03-01 | 1998-02-25 | Strainer insert |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2282445A1 true CA2282445A1 (en) | 1998-09-03 |
Family
ID=8036783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002282445A Abandoned CA2282445A1 (en) | 1997-03-01 | 1998-02-25 | Strainer insert |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0966570A1 (en) |
| AR (1) | AR011893A1 (en) |
| AU (1) | AU6823498A (en) |
| CA (1) | CA2282445A1 (en) |
| DE (1) | DE29703713U1 (en) |
| NO (1) | NO994217L (en) |
| PL (1) | PL335352A1 (en) |
| TW (1) | TW350893B (en) |
| WO (1) | WO1998038389A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT405744B (en) * | 1997-11-05 | 1999-11-25 | Andritz Patentverwaltung | SCREENING |
| CN106087876B (en) * | 2016-08-08 | 2023-06-02 | 辽宁省水利水电科学研究院有限责任公司 | Adhesive tape assembly for concrete joint grooving |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6707428A (en) * | 1967-05-29 | 1968-12-02 | ||
| DE9104551U1 (en) | 1991-04-13 | 1991-06-06 | Bormet, Horst, 6108 Weiterstadt, De | |
| US5534140A (en) * | 1994-03-17 | 1996-07-09 | Envirex, Inc. | Bar screen having compound fine screen bar rack |
| DE19533004A1 (en) * | 1995-09-07 | 1997-03-13 | Geiger Maschf Helmut | Cleaning rake for flowing process or waste water |
| DE29619891U1 (en) * | 1996-11-15 | 1997-01-09 | Raist Gunther | They break |
-
1997
- 1997-03-01 DE DE29703713U patent/DE29703713U1/en not_active Expired - Lifetime
-
1998
- 1998-02-20 TW TW087102441A patent/TW350893B/en active
- 1998-02-25 PL PL98335352A patent/PL335352A1/en unknown
- 1998-02-25 AU AU68234/98A patent/AU6823498A/en not_active Abandoned
- 1998-02-25 WO PCT/EP1998/001067 patent/WO1998038389A1/en not_active Application Discontinuation
- 1998-02-25 EP EP98913589A patent/EP0966570A1/en not_active Withdrawn
- 1998-02-25 CA CA002282445A patent/CA2282445A1/en not_active Abandoned
- 1998-02-27 AR ARP980100884 patent/AR011893A1/en unknown
-
1999
- 1999-08-31 NO NO994217A patent/NO994217L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1998038389A1 (en) | 1998-09-03 |
| AR011893A1 (en) | 2000-09-13 |
| NO994217D0 (en) | 1999-08-31 |
| EP0966570A1 (en) | 1999-12-29 |
| DE29703713U1 (en) | 1997-07-03 |
| TW350893B (en) | 1999-01-21 |
| NO994217L (en) | 1999-08-31 |
| PL335352A1 (en) | 2000-04-25 |
| AU6823498A (en) | 1998-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |