CN203529958U - Sewage purifying device - Google Patents
Sewage purifying device Download PDFInfo
- Publication number
- CN203529958U CN203529958U CN201320431667.8U CN201320431667U CN203529958U CN 203529958 U CN203529958 U CN 203529958U CN 201320431667 U CN201320431667 U CN 201320431667U CN 203529958 U CN203529958 U CN 203529958U
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- Prior art keywords
- semicanal
- group
- horizontal
- container
- pipeline
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- 239000010865 sewage Substances 0.000 title abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000001914 filtration Methods 0.000 claims abstract description 32
- 238000011010 flushing procedure Methods 0.000 claims description 33
- 238000005267 amalgamation Methods 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000005406 washing Methods 0.000 abstract 3
- 238000011001 backwashing Methods 0.000 abstract 2
- 239000011148 porous material Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000004801 Chlorinated PVC Substances 0.000 description 2
- 229920000457 chlorinated polyvinyl chloride Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of sewage treatment, and particularly relates to a sewage purifying device. The sewage purifying device comprises a container, wherein the container is internally provided with a water containing space, and a washing hole and a draining hole which are respectively communicated with the water containing space, the container is respectively connected with a draining pipe and a washing device used for draining a backwashing medium to the water containing space through the washing hole and the draining hole, and a water inlet and a filtering unit used for performing filtration are arranged on the surface of the container. The container of the sewage purifying device adopts a backwashing manner, thus the sewage purifying device is capable of continuously purifying water; the container is of a structure of a calandria body, thus the installation cost of the sewage purifying device is reduced, and the structure of the sewage purifying device is more stable.
Description
Technical field
The utility model belongs to technical field of sewage, specifically, relates to a kind of effluent treatment plant.
Background technology
Along with social development, people more and more pay attention to the environmental quality of life, especially water resources; Due to current water damage ratio more seriously and shorter, all there is lack of water situation in many places; For lack of water, the contaminated problem of water resources, a lot of producers all develops corresponding treating plant and cleaner, and these treating plants, cleaner, can be along with the prolongation of working hour, efficiency step-downs when purifying; Its reason be treating plant, cleaner filtering unit in use, the increasing dirt of its surface attachment, foreign material, the surperficial filter pore of filtering unit is stopped up gradually, thereby has influence on discharge; The problem of adhering in order to solve filtering unit surface attachments, a lot of producers develops the treating plant with back flushing, when the working efficiency for the treatment of plant reduces, treating plant can start back-purge system, by clean water reversed flow, the dirt settling that is attached to filtering unit surface is rinsed out, thereby reach the purification efficiency that maintains treating plant.Yet take back-purge system, can make the structure of whole treating plant more complicated on the one hand, secondly back flushing work meeting has influence on purification efficiency.
Summary of the invention
The purpose of this utility model is to solve the deficiencies in the prior art, and a kind of effluent treatment plant is provided, and this apparatus structure is simple, can solve the problem of filtering unit surface attachment dirt settling and the problem that employing back flushing affects purification efficiency, and simple to operate.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of effluent treatment plant, comprise container, in described container, be provided with water space, and the rinse mouth being communicated with water space respectively and water port, described container is connected with respectively water shoot by water port and rinse mouth and for discharge the flushing arrangement of the medium of recoil to water space, the surface of described container is provided with prosopyle and the filtering unit for filtering.
Filtering unit, when arranging, can arrange the outside surface that is fixed on container, also the internal surface that is fixed on container can be set.Water port and rinse mouth can arrange respectively, and can arrange a plurality of.
Further, in described container, be provided with turbulent.
Further, container comprises at least one comb group, and described comb group comprises two semicanal groups, and two semicanal groups are respectively the first semicanal group and the second semicanal group; Described semicanal group comprises a plurality of intervals and the semicanal vertically arranging, and wherein prosopyle is arranged at the wherein side of several semicanals; Between adjacent semicanal, be provided with connection piece; The upper end of semicanal group is provided with the horizontal semicanal of arranged transversely, and laterally the two ends of semicanal are respectively equipped with horizontal semitight sheet, and the lower end of semicanal group is provided with semitight housing; Connection piece in the first semicanal group is fixedly connected with the connection piece in corresponding the second semicanal group, and the semicanal amalgamation of the semicanal of the first semicanal group and the second semicanal group forms vertical pipeline; The horizontal semicanal amalgamation of the horizontal semicanal of the first semicanal group and the second semicanal group forms horizontal pipeline, and horizontal pipeline is communicated with the upper end of each vertical pipeline; The semitight housing amalgamation of the semitight housing of the first semicanal group and the second semicanal group forms seal casinghousing, and seal casinghousing is communicated with the lower end of each vertical pipeline; The two ends of horizontal pipeline are all by two corresponding laterally semitight sheet splicing sealings; Described water port and rinse mouth are arranged on horizontal pipeline.
Further, container comprises at least one comb group, and described comb group comprises two semicanal groups, and two semicanal groups are respectively the first semicanal group and the second semicanal group; Described semicanal group comprises a plurality of intervals and the semicanal vertically arranging, and wherein prosopyle is arranged at the wherein side of several semicanals; Between adjacent semicanal, be provided with connection piece, the lower end of semicanal is provided with second diaphragm seal; The upper end of semicanal group is provided with the horizontal semicanal of arranged transversely, and laterally the two ends of semicanal are respectively equipped with horizontal semitight sheet; Connection piece in the first semicanal group is fixedly connected with the connection piece in corresponding the second semicanal group, and the semicanal amalgamation of the semicanal of the first semicanal group and the second semicanal group forms vertical pipeline; The horizontal semicanal amalgamation of the horizontal semicanal of the first semicanal group and the second semicanal group forms horizontal pipeline, and horizontal pipeline is communicated with the upper end of each vertical pipeline; Every end of horizontal pipeline is all by two corresponding laterally semitight sheet splicing sealings; The lower end of vertical pipeline is by two corresponding second diaphragm seal splicing sealings, and described water port and rinse mouth are arranged on horizontal pipeline.
Further, described water port and the rinse mouth formation opening that unites two into one.
Further, described opening is spliced by two half openings, and two half openings are arranged at respectively on the horizontal semicanal of the first semicanal group and the horizontal semicanal of the second semicanal group.
Further, each half opening is provided with half-connection pipe, and two half-connection pipes are spliced to form pipe connecting.
The other end of described water shoot is provided with pumping plant.
Further, container comprises a plurality of comb groups and communicating pipe, and the side of communicating pipe is connected with the upper end of each pipe connecting, and communicating pipe is communicated with each pipe connecting.
Further, described filtering unit is filtering net or filter cloth or filtering membrane or membrane bioreactor.Wherein the film on filtering membrane, membrane bioreactor can adopt pvdf membrane or PTFE film or CPVC film
Further, described water shoot is provided with under meter, and under meter is connected with the control unit signal of flushing arrangement.
Further, in described water space, be provided with pressure gage, pressure gage is connected with the control unit signal of flushing arrangement.
Further, described flushing arrangement comprises air compressor machine or pump or accommodates the media Containers of medium, and air compressor machine or pump or media Containers are connected with container, and are provided with valve between media Containers and container.
The beneficial effect that the utility model is obtained is: container of the present utility model adopts the mode of back flushing, and that can be responsible for that device can continue purifies waste water, and container adopts the structure of calandria simultaneously, and installation cost is reduced, and structure is more firm.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of semicanal group of the present utility model.
Fig. 2 is the schematic diagram at a kind of visual angle of Fig. 1.
Fig. 3 is the front view of Fig. 1.
Fig. 4 is a kind of structural representation of comb group of the present utility model.
Fig. 5 is a kind of structural representation of the present utility model.
Fig. 6 is the another kind of structural representation of semicanal group of the present utility model.
Fig. 7 is the front view of Fig. 6.
Fig. 8 is the another kind of structural representation of comb group of the present utility model.
Fig. 9 is another kind of structural representation of the present utility model.
Reference numeral is:
1---second diaphragm seal 2---semicanal 3---prosopyle
4---connection piece 5---horizontal semicanal 6---half-connection pipes
7---vertical pipeline 8---horizontal pipeline 9---pipe connectings
10---flushing arrangement 11---communicating pipe 12---water shoots
13---pumping plant 14---semitight housing 15---seal casinghousings.
Embodiment
Below in conjunction with accompanying drawing 1, to Fig. 9, and embodiment is described further the utility model.
Embodiment 1: referring to Fig. 1 to Fig. 5.
A kind of effluent treatment plant, comprise container, in described container, be provided with water space, and the rinse mouth being communicated with water space respectively and water port, described container is connected with respectively water shoot 12 by water port and rinse mouth and for discharge the flushing arrangement 10 of the medium of recoil to water space, the surface of described container is provided with prosopyle 3 and the filtering unit (not shown in FIG.) for filtering.Filtering unit is arranged on outside prosopyle 3.The internal surface that can certainly be arranged on container is in prosopyle 3.Described filtering unit is filtering net or filter cloth or filtering membrane or membrane bioreactor or pvdf membrane or PTFE film or CPVC film.As MBR film.
During the utility model work, container is positioned in sewage, sewage forms clean water after filtering by filtering unit, and clean water enters water space by prosopyle 3, and by the outside draining of water shoot 12.When the surface attachment of filtering unit has the dirt settling of more amount, start flushing arrangement 10.Flushing arrangement 10 is to the medium that discharges certain pressure intensity in water space, and its medium is gaseous state or liquid state; Medium filter pore by filtering unit in water space enters sewage, at medium, from the filter pore of filtering unit, enter the process of sewage, the dirt settling that is attached to filtering unit surface is washed from out from the filter pore of filter unit, thereby reach the object of clean filtering cell surface.Thereby make draining continuity.And apparatus structure is simple, and easy to operate.Mild for current are flowed in water space in addition, in container, be provided with turbulent (not shown in FIG.).
The technical program is when implementing, container can adopt any shape, its shape is unrestricted, for making container there is handling ease, convenient for production, by Vessel Design, be the mode of comb group combination here, as shown in Figure 1, Figure 2, Figure 3, Figure 4, container comprises at least one comb group, and described comb group comprises two semicanal groups, and two semicanal groups are respectively the first semicanal group and the second semicanal group; Described semicanal group comprises a plurality of intervals and the semicanal 2 vertically arranging, and wherein prosopyle 3 is arranged at the wherein side of several semicanals 2; Between adjacent semicanal 2, be provided with connection piece 4, the lower end of semicanal 2 is provided with second diaphragm seal 1; The upper end of semicanal group is provided with the horizontal semicanal 5 of arranged transversely, and laterally the two ends of semicanal 5 are respectively equipped with horizontal semitight sheet; Connection piece 4 in the first semicanal group is fixedly connected with the connection piece 4 in corresponding the second semicanal group, and semicanal 2 amalgamations of the semicanal of the first semicanal group and the second semicanal group form vertical pipeline 7; Horizontal semicanal 5 amalgamations of the horizontal semicanal 5 of the first semicanal group and the second semicanal group form horizontal pipeline 8, and horizontal pipeline 8 is communicated with the upper end of each vertical pipeline 7; Every end of horizontal pipeline 8 is all by two corresponding laterally semitight sheet splicing sealings; The lower end of vertical pipeline 7 is by two corresponding second diaphragm seal 1 splicing sealings, and described water port and rinse mouth are arranged on horizontal pipeline 8.
As the equivalent variations of above-mentioned technology, second diaphragm seal can be arranged to the upper end of vertical pipeline 7, horizontal pipeline 5 is arranged to the lower end of vertical pipeline 7.
Container is arranged to the form of comb group, be convenient to processing and install, in the specific implementation, only 2 groups of splicings of two semicanals just can need to be formed to the container being combined by a plurality of pipelines, when processing fixedly, only the corresponding connection piece 4 of two semicanal groups need to be fixedly connected with.When being fixedly connected with, can adopt welding, bolt to connect, and ultrasonic welding, this Novel main will adopt ultrasonic welding, thereby makes assembling procedure become comparatively simple.In design during prosopyle 3, prosopyle 3 on suitable vertical pipeline 7 as required.This is novel when design, and when considering back flushing, the factors such as pressure when medium enters pipeline, will not arrange prosopyle 3 on a pipeline in the middle of being positioned at.Certainly, as equivalent variations, can will prosopyle 3 be set on vertical pipeline 7 yet.Turbulent can be arranged to different shapes as required, is fixed in corresponding vertical pipeline 7.When design rinse mouth and water port, on horizontal pipeline 8, choose as required more a plurality of in addition.
In order to make structure more simple, formation opening here unites two into one described water port and rinse mouth.Be container pass through an opening both with rinse assembly and connection, be connected with water shoot 12 again.When work, first by the outside draining of water shoot 12.When needs back flushing, first by the valve closes on water shoot 12; Open flushing arrangement 10, after flushing, flushing arrangement 10 quits work again, the valve open on water shoot 12, more then draining.
Because comb group is spliced by two semicanal groups, in order to facilitate designed openings, therefore when design, described opening is spliced by two half openings, and two half openings are arranged at respectively on the horizontal semicanal 5 of the first semicanal group and the horizontal semicanal 5 of the second semicanal group.Certainly, as equivalent variations, also opening can be arranged on one of them horizontal semicanal 5.
Opening should be as water port again as rinse mouth, therefore need to connect a pipe connecting 9 at opening part, by this pipe connecting 9, be connected with water shoot 12 with flushing arrangement 10 respectively, in order to facilitate the design of Outer Tube, each half opening is provided with to 6, two half-connection pipes 6 of half-connection pipe and is spliced to form pipe connecting 9.So just without again pipe connecting being installed.Pipe connecting 9 is one-body molded with comb group.
In order to increase service efficiency, container can be set to the combination of a plurality of comb groups, container comprises a plurality of comb groups and communicating pipe 11, the side of communicating pipe 11 is connected with the upper end of each pipe connecting 9, and communicating pipe 11 is communicated with each pipe connecting 9.By communicating pipe 11 comb group being communicated with, form a large container.
One end of communicating pipe 11 is connected with flushing arrangement 10, and the other end of communicating pipe 11 is connected with water shoot 12, and the water side of water shoot 12 is connected with pumping plant 13.Draw water and can adopt the devices such as pump.
For make effluent treatment plant can be in operatorless situation continuous firing, the work of flushing arrangement 10 starts can be divided into start by set date or induction starts, and while adopting start by set date scheme, only needs start by set date.By on flushing arrangement 10, control unit being set, control unit is as micro-chip, PLC etc., and control unit is controlled flushing arrangement 10 pulse operations.As adopt induction to start, at water space, pressure gage is set or on water shoot 12, under meter is set, and on flushing arrangement 10, control unit is set simultaneously, and the signal output part of pressure gage or the signal output part of under meter are connected with control unit signal, and control unit is controlled flushing arrangement 10 work.If flushing arrangement 10 adopts air compressor machine or pump, control unit is connected with the control end of flushing arrangement 10, if flushing arrangement 10 adopts media Containers, control unit is connected with valve signal, for the folding of by-pass valve control.
For simplified apparatus, can water shoot 12 is one-body molded with the communicating pipe 11 of container.Water shoot 12 can be selected flexible duct, can also be convenient to bending, deformation.
Embodiment 2: referring to Fig. 6 to Fig. 8.
A kind of effluent treatment plant, its structure is basic identical with embodiment 1, its difference is: the lower end of semicanal group is provided with semitight housing 14, in half body, semitight housing 14 amalgamations of the semitight housing 14 of the first semicanal group and the second semicanal group form seal casinghousing 15, and seal casinghousing 15 is communicated with the lower end of each vertical pipeline 7.
The lower end of half body is arranged to the housing of accommodation space, water flows to after vertical pipeline 7, enters seal casinghousing 15, then is extracted out and gone by the vertical pipeline 7 that prosopyle is not set.In order to facilitate vertical pipeline 7 to draw water, seal casinghousing 15 can be set to trilateral or taper, protrude downwards at its middle part; The vertical pipeline 7 that side does not arrange prosopyle is arranged on the middle part of half body, and as preferred version, the lower end of this vertical pipeline 7 extends downward the lower end of seal casinghousing 15.
The pipelines such as the horizontal pipeline 8 in file, vertical pipeline 7, communicating pipe 11 all can adopt the tubing of pipe, square tube and other shapes.
Below be only the application's preferred embodiment, equivalent technical solutions on this basis still falls into application protection domain.
Claims (10)
1. an effluent treatment plant, comprise container, in described container, be provided with water space, and the rinse mouth being communicated with water space respectively and water port, it is characterized in that: described container is connected with respectively water shoot by water port and rinse mouth and for discharge the flushing arrangement of the medium of recoil to water space, the surface of described container is provided with prosopyle and the filtering unit for filtering.
2. a kind of effluent treatment plant according to claim 1, is characterized in that: container comprises at least one comb group, and described comb group comprises two semicanal groups, and two semicanal groups are respectively the first semicanal group and the second semicanal group; Described semicanal group comprises a plurality of intervals and the semicanal vertically arranging, and wherein prosopyle is arranged at the wherein side of several semicanals; Between adjacent semicanal, be provided with connection piece; The upper end of semicanal group is provided with the horizontal semicanal of arranged transversely, and laterally the two ends of semicanal are respectively equipped with horizontal semitight sheet, and the lower end of semicanal group is provided with semitight housing; Connection piece in the first semicanal group is fixedly connected with the connection piece in corresponding the second semicanal group, and the semicanal amalgamation of the semicanal of the first semicanal group and the second semicanal group forms vertical pipeline; The horizontal semicanal amalgamation of the horizontal semicanal of the first semicanal group and the second semicanal group forms horizontal pipeline, and horizontal pipeline is communicated with the upper end of each vertical pipeline; The semitight housing amalgamation of the semitight housing of the first semicanal group and the second semicanal group forms seal casinghousing, and seal casinghousing is communicated with the lower end of each vertical pipeline; The two ends of horizontal pipeline are all by two corresponding laterally semitight sheet splicing sealings; Described water port and rinse mouth are arranged on horizontal pipeline.
3. a kind of effluent treatment plant according to claim 1, is characterized in that: container comprises at least one comb group, and described comb group comprises two semicanal groups, and two semicanal groups are respectively the first semicanal group and the second semicanal group; Described semicanal group comprises a plurality of intervals and the semicanal vertically arranging, and wherein prosopyle is arranged at the wherein side of several semicanals; Between adjacent semicanal, be provided with connection piece, the lower end of semicanal is provided with second diaphragm seal; The upper end of semicanal group is provided with the horizontal semicanal of arranged transversely, and laterally the two ends of semicanal are respectively equipped with horizontal semitight sheet; Connection piece in the first semicanal group is fixedly connected with the connection piece in corresponding the second semicanal group, and the semicanal amalgamation of the semicanal of the first semicanal group and the second semicanal group forms vertical pipeline; The horizontal semicanal amalgamation of the horizontal semicanal of the first semicanal group and the second semicanal group forms horizontal pipeline, and horizontal pipeline is communicated with the upper end of each vertical pipeline; Every end of horizontal pipeline is all by two corresponding laterally semitight sheet splicing sealings; The lower end of vertical pipeline is by two corresponding second diaphragm seal splicing sealings, and described water port and rinse mouth are arranged on horizontal pipeline.
4. according to a kind of effluent treatment plant described in claim 2 or 3, it is characterized in that: described water port and the rinse mouth formation opening that unites two into one.
5. a kind of effluent treatment plant according to claim 4, it is characterized in that: described opening is spliced by two half openings, and two half openings are arranged at respectively on the horizontal semicanal of the first semicanal group and the horizontal semicanal of the second semicanal group, in described container, are provided with turbulent.
6. a kind of effluent treatment plant according to claim 5, is characterized in that: each half opening is provided with half-connection pipe, and two half-connection pipes are spliced to form pipe connecting.
7. a kind of effluent treatment plant according to claim 6, is characterized in that: container comprises a plurality of comb groups and communicating pipe, and the side of communicating pipe is connected with the upper end of each pipe connecting, and communicating pipe is communicated with each pipe connecting.
8. according to the arbitrary described a kind of effluent treatment plant of claims 1 to 3, it is characterized in that: filtering unit is filtering net or filter cloth or filtering membrane or membrane bioreactor.
9. according to the arbitrary described a kind of effluent treatment plant of claims 1 to 3, it is characterized in that: described water shoot is provided with under meter, under meter is connected with the control unit signal of flushing arrangement; Or in described water space, be provided with pressure gage, pressure gage is connected with the control unit signal of flushing arrangement.
10. according to the arbitrary described a kind of effluent treatment plant of claims 1 to 3, it is characterized in that: described flushing arrangement comprises air compressor machine or pump or accommodate the media Containers of medium, air compressor machine or pump or media Containers are connected with container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320431667.8U CN203529958U (en) | 2013-07-19 | 2013-07-19 | Sewage purifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320431667.8U CN203529958U (en) | 2013-07-19 | 2013-07-19 | Sewage purifying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203529958U true CN203529958U (en) | 2014-04-09 |
Family
ID=50416192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320431667.8U Expired - Fee Related CN203529958U (en) | 2013-07-19 | 2013-07-19 | Sewage purifying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203529958U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106542595A (en) * | 2017-01-12 | 2017-03-29 | 海宁蒙努皮革制品有限公司 | A kind of leather sewage processing pond |
-
2013
- 2013-07-19 CN CN201320431667.8U patent/CN203529958U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106542595A (en) * | 2017-01-12 | 2017-03-29 | 海宁蒙努皮革制品有限公司 | A kind of leather sewage processing pond |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140409 |
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| CX01 | Expiry of patent term | ||
| CU01 | Correction of utility model |
Correction item: Termination upon expiration of patent Correct: Revocation of Patent Expiration and Termination False: Expiration and Termination of 39 Volume 3102 Patent on August 4, 2023 Number: 31-02 Volume: 39 |
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| CU01 | Correction of utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 |
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| CF01 | Termination of patent right due to non-payment of annual fee |