CN111530142A - Automatically cleaning purifier - Google Patents
Automatically cleaning purifier Download PDFInfo
- Publication number
- CN111530142A CN111530142A CN202010379793.8A CN202010379793A CN111530142A CN 111530142 A CN111530142 A CN 111530142A CN 202010379793 A CN202010379793 A CN 202010379793A CN 111530142 A CN111530142 A CN 111530142A
- Authority
- CN
- China
- Prior art keywords
- pipe
- water
- position arc
- shell
- shaped spoiler
- 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- Withdrawn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
- 238000004140 cleaning Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 239000010865 sewage Substances 0.000 claims abstract description 42
- 230000001360 synchronised effect Effects 0.000 claims abstract description 21
- 238000000746 purification Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 abstract description 31
- 239000012535 impurity Substances 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 11
- 239000012792 core layer Substances 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 11
- 235000017491 Bambusa tulda Nutrition 0.000 description 11
- 241001330002 Bambuseae Species 0.000 description 11
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 11
- 239000011425 bamboo Substances 0.000 description 11
- 239000008187 granular material Substances 0.000 description 8
- 239000008213 purified water Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a self-cleaning water purifying device which comprises a shell, wherein a high-position arc-shaped spoiler and a low-position arc-shaped spoiler are fixedly installed in the shell, the high-position arc-shaped spoiler and the low-position arc-shaped spoiler are installed between the high-position arc-shaped spoiler and the low-position arc-shaped spoiler in a sealing mode, a filter cartridge is inserted into the shell in a sealing mode, a plurality of filter core layers are installed on the inner wall of the filter cartridge at equal intervals, a water inlet pipe and a water outlet pipe are respectively inserted and installed at the upper end of the shell, the lower end of the water inlet pipe is located above the left side of the high-position. According to the invention, the water purification pipe and the sewage discharge pipe are opened simultaneously through the synchronous valve core, so that the self-cleaning function can be automatically started while water is used, manual or electric power opening is not required, the automatic cleaning device is green and environment-friendly, impurities on the surface of the filter element layer are automatically cleaned when the filter element layer is blocked through the pressure one-way valve, and a vortex is formed through the swirl vanes to further increase the filtering effect and the self-cleaning effect.
Description
Technical Field
The invention relates to the field of water purification, in particular to a self-cleaning water purification device.
Background
With the increasing requirement of domestic water, more and more families buy the water purifier and use for drinking water and machine water such as dish washer, washing machine reach certain purity.
The existing water purifier usually adopts electric control, the power consumption of the existing water purifier is large, the loss of a filter element is fast, and the existing water purifier is not economical enough.
Disclosure of Invention
The invention aims to solve the defects of high power control energy consumption and large filter element loss in the prior art, and provides a self-cleaning water purifying device.
In order to achieve the purpose, the invention adopts the following technical scheme:
a self-cleaning water purifying device comprises a shell, wherein a high-position arc-shaped spoiler and a low-position arc-shaped spoiler are fixedly installed in the shell, the high-position arc-shaped spoiler and the low-position arc-shaped spoiler are installed in the shell in a sealing mode, a filter cartridge is inserted into the shell in a sealing mode, a plurality of filter core layers are installed on the inner wall of the filter cartridge at equal intervals, a water inlet pipe and a water outlet pipe are respectively inserted and installed at the upper end of the shell, the lower end of the water inlet pipe is located above the left side of the high-position arc-shaped spoiler, the lower end of the water outlet pipe is located below the right side of the low-position arc-shaped spoiler, a sewage pipe is inserted and installed at the lower end of the shell, a pressure one-way valve is installed on the sewage pipe and the water outlet pipe, a valve body is jointly installed on the sewage pipe and the, a water purifying pipe and a sewage draining pipe are respectively inserted on the valve body;
the inlet tube advances water to the shell in, because blocking of high-order arc spoiler and low level arc spoiler makes rivers can only follow the below of high-order arc spoiler and flows upwards along straining a section of thick bamboo, then flows into the opposite side and flows from the outlet pipe from the upper end of low level arc spoiler, rivers are through straining interior by a plurality of filter element layer multi-stage filtration, increase its filterable effect.
Preferably, the synchronous valve core comprises a first plug, a second plug and a communicating groove, the water outlet pipe is positioned above the first plug, the water purifying pipe is positioned at the communicating groove, and the sewage discharge pipe and the sewage pipe are respectively positioned at two sides of the second plug;
the water flow of the water outlet pipe enters the valve body, the water purifying pipe is opened to eliminate the pressure at the communicating groove, the water flow at the water outlet pipe pushes the synchronous valve core to move downwards, so that the water outlet pipe is communicated with the water purifying pipe through the valve body, namely, purified water flows out of the water purifying pipe for use, and the synchronous valve core moves downwards to enable the communicating groove to be communicated with the sewage discharge pipe and the sewage pipe;
when the filter element layer is not blocked, water flows out through the water outlet pipe, the pressure at the sewage pipe is small, the pressure one-way valve is not opened, when the filter element layer is blocked, water is difficult to pass through the filter element layer to reach the water outlet pipe, the pressure of the sewage pipe is increased, the pressure one-way valve is opened, the water flows out to the sewage pipe and forms suction at the lower end of the filter cylinder to suck impurities blocked on the filter element layer out and discharge the impurities along with the sewage pipe, the effect of automatically purifying the filter element layer is achieved, and the service life of the filter element layer is prolonged;
synchronous case makes outlet pipe and sewage pipe simultaneously respectively through water purification pipe and blow off pipe intercommunication, then opens automatically when the water from clean process, need not to open alone, increases its convenience, and opens through water pressure, need not electric control, and is energy-concerving and environment-protective.
Preferably, a rotating shaft is rotatably mounted on the inner bottom wall of the filter cartridge, and the lower end of the rotating shaft extends to the inner lower end of the filter cartridge and is provided with swirl vanes;
in the water use process, rivers flow to the top of straining a section of thick bamboo and make the whirl leaf rotatory, and rotatory whirl leaf makes the below of straining a section of thick bamboo form the swirl, and the swirl makes great impurity sink to the upper end of sewage pipe, and the sewage pipe of being convenient for discharges large granule impurity fast, and can avoid large granule impurity to block up or destroy the filter core layer.
The invention has the following beneficial effects:
1. when making the water through the synchronous case in the valve body, the water pressure promotion that synchronous case received in the outlet pipe moves down and opens water purification pipe and blow off pipe simultaneously, even make water purification pipe and outlet pipe pass through the first end cap top intercommunication of valve body, blow off pipe and sewer pipe pass through the intercommunication groove intercommunication, open the self-cleaning function automatically when using water promptly, need not manually to open, increase the convenience of using, and open through water pressure, need not electric control, energy-concerving and environment-protective.
2. When the filter element layer normally works, the pressure at the sewage pipe is smaller than the pressure of the water outlet pipe, the pressure one-way valve is closed, when the filter element layer is blocked, the pressure at the sewage pipe is larger than the pressure of the water outlet pipe, so that water flows along the sewage pipe, suction is formed below the filter cartridge to suck and discharge impurities on the filter element layer, the service life of the filter element layer is prolonged, and the replacement times of the filter cartridge are reduced.
3. The whirl leaf is rotatory when rivers flow along straining a section of thick bamboo and is makeed a rivers formation swirl of section of thick bamboo below, and the swirl makes in the rivers large granule impurity sink to the upper end of sewage pipe for can discharge large granule impurity fast during the blowdown, and can avoid large granule impurity upflow to block up the filter element layer or destroy the filter element layer, further increase filterable reliability and from clean effect.
In conclusion, the water purification device has the advantages that the water purification pipe and the sewage discharge pipe are opened simultaneously through the synchronous valve core, the self-cleaning function can be automatically started while water is used, manual or electric starting is not needed, the environment is protected, impurities on the surface of the filter element layer are automatically cleaned when the filter element layer is blocked through the pressure one-way valve, and the vortex is formed through the vortex blades to further increase the filtering effect and the self-cleaning effect.
Drawings
FIG. 1 is a schematic structural diagram of a self-cleaning water purifying device according to the present invention;
FIG. 2 is an enlarged view of a high and low position curved flow-obstructing plate of the self-cleaning water purifying device according to the present invention;
FIG. 3 is an enlarged view of a portion of a synchronous valve core of a self-cleaning water purifying device according to the present invention;
fig. 4 is a schematic structural diagram of the second embodiment.
In the figure: the device comprises a shell 1, a high-position arc spoiler 11, a low-position arc spoiler 12, a water outlet pipe 2, a water inlet pipe 3, a filter cartridge 4, a filter element layer 41, a rotating shaft 42, a rotational flow leaf 421, a sewage pipe 5, a pressure check valve 51, a valve body 6, a purified water pipe 61, a sewage pipe 62, a synchronous valve core 63, a first plug 631, a communicating groove 632, a second plug 633 and a spring 64.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The first embodiment is as follows:
referring to fig. 1-3, a self-cleaning water purifying device comprises a housing 1, a high-position arc spoiler 11 and a low-position arc spoiler 12 are fixedly installed in the housing 1, the high-position arc spoiler 11 and the low-position arc spoiler 12 are hermetically installed, a filter cartridge 4 is hermetically inserted in an inner thread of the housing 1, a plurality of filter core layers 41 are equidistantly installed on an inner wall of the filter cartridge 4, a water inlet pipe 3 and a water outlet pipe 2 are respectively inserted and installed at the upper end of the housing 1, the lower end of the water inlet pipe 3 is located above the left side of the high-position arc spoiler 11, the lower end of the water outlet pipe 2 is located below the right side of the low-position arc spoiler 12, a sewage pipe 5 is inserted and installed at the lower end of the housing 1, a pressure check valve 51 is installed on the sewage pipe 5 and the water outlet pipe 2, a valve body 6 is installed together with the valve, one ends of the two springs 64 far away from the synchronous valve core 63 are respectively fixed on the inner wall of the valve body 6, and a water purification pipe 61 and a sewage discharge pipe 62 are respectively inserted on the valve body 6;
the inlet tube 3 is intake to the shell 1 in, because the blocking of high-order arc spoiler 11 and low level arc spoiler 12 makes rivers can only flow upwards along straining a section of thick bamboo 4 from the below of high-order arc spoiler 11, then flows into the opposite side and flows from outlet pipe 2 from the upper end of low level arc spoiler 12, rivers are filtered by a plurality of filter core layer 41 multistage in straining a section of thick bamboo 4, increase its filterable effect.
The synchronous valve core 63 comprises a first choke plug 631, a second choke plug 633 and a communicating groove 632, the water outlet pipe 2 is positioned above the first choke plug 631, the water purifying pipe 61 is positioned at the communicating groove 632, and the sewage discharge pipe 62 and the sewage pipe 5 are respectively positioned at two sides of the second choke plug 633;
the water flow of the water outlet pipe 2 enters the valve body 6, the purified water pipe 61 is opened to make the pressure at the communicating groove 632 disappear, the water flow at the water outlet pipe 2 pushes the synchronous valve core 63 to move downwards, so that the water pipe 2 is communicated with the purified water pipe 61 through the valve body 6, namely, the purified water flows out through the purified water pipe 61 for use, and the synchronous valve core 63 moves downwards to make the communicating groove 632 communicated with the sewage discharge pipe 62 and the sewage pipe 5;
when the filter element layer 41 is not blocked, water flows out through the water outlet pipe 2, the pressure at the sewage pipe 5 is small, the pressure one-way valve 51 is not opened, when the filter element layer 41 is blocked, water is difficult to pass through the filter element layer 41 to reach the water outlet pipe 2, the pressure of the sewage pipe 5 is increased, the pressure one-way valve 51 is opened, the water is discharged to the sewage pipe 5, suction force is formed at the lower end of the filter cartridge 4 to suck impurities blocked on the filter element layer 41 out and discharge the impurities along with the sewage pipe 5, and the effect of automatically purifying the filter element layer 41 is achieved;
In this embodiment, the water flowing through the water inlet pipe 3 enters the housing 1 and flows into the filter cartridge 4 along the lower end of the high-position arc spoiler 11, flows out along the upper end of the low-position arc spoiler 12 through the filtration of the multiple filter layers 41, flows into the valve body 6 along with the water outlet pipe 2 and is located above the first plug 631, because the water purifying pipe 61 is closed, the water pressure at the water purifying pipe 61 prevents the synchronous valve element 63 from moving, the water purifying pipe 61 is opened to release the pressure of the water purifying pipe 61, the water in the communicating groove 632 is discharged, the water pressure above the first plug 631 pushes the synchronous valve element 63 to move downward, the water purifying pipe 61 is communicated with the water outlet pipe 2 through the upper part of the first plug, and the sewage discharge pipe 62 is communicated with the sewage pipe 5 through the communicating groove 632, that is the water and the self-cleaning are simultaneously opened;
during normal use, filter element layer 41 trafficability characteristic is higher, outlet pipe 2 department water pressure is greater than 5 water pressures of sewer pipe, pressure check valve 51 closes, after filter element layer 41 is blockked up by a large scale, make the water pressure of sewer pipe 5 department be greater than the limit value of pressure check valve 51, then pressure check valve 51 opens, rivers are discharged along sewer pipe 5 and blow off pipe 62, then form suction under straining a section of thick bamboo 4, make the impurity of blockking up on the filter element layer 41 peel off and be discharged, after filter element layer 41 cleans up, the pressure of sewer pipe 5 department is less than the limit value of pressure check valve 51, then pressure check valve 51 closes, rivers continue to strain 4 and filter and flow out outlet pipe 2 along straining a section of thick bamboo and discharge the use through clear water pipe 61.
Example two:
referring to fig. 4, a self-cleaning water purifying device, which is substantially the same as the first embodiment except that:
a rotating shaft 42 is rotatably mounted on the inner bottom wall of the filter cartridge 4, and the lower end of the rotating shaft 42 extends to the lower end of the interior of the filter cartridge 4 and is provided with a swirl vane 421;
in the water using process, water flows to the upper part of the filter cartridge 4 to enable the swirl vanes 421 to rotate, the lower part of the filter cartridge 4 is enabled to form a swirl by the rotating swirl vanes, the swirl enables large impurities to sink to the upper end of the sewage pipe 5, the sewage pipe 5 can discharge the large particles of impurities quickly, and the filter element layer 41 can be prevented from being blocked or damaged by the large particles of impurities.
In this embodiment, the whirl leaf 421 rotates when rivers flow along straining a section of thick bamboo 4, and pivoted whirl leaf 421 makes the below of straining a section of thick bamboo 4 form the swirl, and the swirl makes in the rivers large granule impurity sink to the upper end of sewer 5 fast, and when opening from the cleanness, large granule impurity can be discharged fast, and the formation of swirl can avoid large granule impurity upwards to block up filter element layer 41 or destroy filter element layer 41, further increases filter effect and from clean effect.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. The self-cleaning water purifying device comprises a shell (1) and is characterized in that a high-position arc-shaped spoiler (11) and a low-position arc-shaped spoiler (12) are fixedly mounted in the shell (1), the high-position arc-shaped spoiler (11) and the low-position arc-shaped spoiler (12) are hermetically mounted, a filter cartridge (4) is inserted into the shell (1) in a sealing manner, a plurality of filter cartridge layers (41) are installed on the inner wall of the filter cartridge (4) in an equidistant manner, a water inlet pipe (3) and a water outlet pipe (2) are respectively inserted and installed at the upper end of the shell (1), the lower end of the water inlet pipe (3) is located above the left side of the high-position arc-shaped spoiler (11), the lower end of the water outlet pipe (2) is located below the right side of the low-position arc-shaped spoiler (12), a sewage pipe (5) is inserted and installed at the lower end of the shell (1), valve body (6) are installed jointly in sewage pipe (5) and outlet pipe (2), slidable mounting has synchronous case (63) in valve body (6), spring (64) are all installed at the both ends of synchronous case (63), and two spring (64) keep away from the one end of synchronous case (63) and fix respectively on the inner wall of valve body (6), insert respectively on valve body (6) and be equipped with water purification pipe (61) and blow off pipe (62).
2. Self-cleaning water purifying device according to claim 1, wherein the synchronous valve core (63) comprises a first choke plug (631), a second choke plug (633) and a communicating groove (632), the water outlet pipe (2) is located above the first choke plug (631), the water purifying pipe (61) is located at the communicating groove (632), and the sewage draining pipe (62) and the sewage draining pipe (5) are respectively located at two sides of the second choke plug (633).
3. A self-cleaning water purifying device as claimed in claim 1, characterized in that a rotating shaft (42) is rotatably mounted on the inner bottom wall of the filter cartridge (4), the lower end of the rotating shaft (42) extends to the inner lower end of the filter cartridge (4) and is mounted with a swirl vane (421).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010379793.8A CN111530142A (en) | 2020-05-08 | 2020-05-08 | Automatically cleaning purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010379793.8A CN111530142A (en) | 2020-05-08 | 2020-05-08 | Automatically cleaning purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111530142A true CN111530142A (en) | 2020-08-14 |
Family
ID=71975432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010379793.8A Withdrawn CN111530142A (en) | 2020-05-08 | 2020-05-08 | Automatically cleaning purifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111530142A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112875807A (en) * | 2021-02-05 | 2021-06-01 | 郭丽娟 | Water purifying device |
| CN113318514A (en) * | 2021-08-04 | 2021-08-31 | 江苏拓邦环保科技有限公司 | Changeable filter core sewage preliminary treatment equipment |
| CN114275922A (en) * | 2022-01-26 | 2022-04-05 | 广东欣美技术股份有限公司 | Vortex type water purifying device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2518566Y (en) * | 2001-03-07 | 2002-10-30 | 唐明杰 | Pressure water purifier |
| CN201404725Y (en) * | 2009-05-21 | 2010-02-17 | 青岛海德威船舶科技有限公司 | Automatic back flushing filter |
| WO2017073261A1 (en) * | 2015-10-30 | 2017-05-04 | ヤマシンフィルタ株式会社 | Filter device |
| CN111054115A (en) * | 2019-12-12 | 2020-04-24 | 广州江水清智能科技有限公司 | Self-cleaning piston type filter and filtering system |
-
2020
- 2020-05-08 CN CN202010379793.8A patent/CN111530142A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2518566Y (en) * | 2001-03-07 | 2002-10-30 | 唐明杰 | Pressure water purifier |
| CN201404725Y (en) * | 2009-05-21 | 2010-02-17 | 青岛海德威船舶科技有限公司 | Automatic back flushing filter |
| WO2017073261A1 (en) * | 2015-10-30 | 2017-05-04 | ヤマシンフィルタ株式会社 | Filter device |
| CN111054115A (en) * | 2019-12-12 | 2020-04-24 | 广州江水清智能科技有限公司 | Self-cleaning piston type filter and filtering system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112875807A (en) * | 2021-02-05 | 2021-06-01 | 郭丽娟 | Water purifying device |
| CN113318514A (en) * | 2021-08-04 | 2021-08-31 | 江苏拓邦环保科技有限公司 | Changeable filter core sewage preliminary treatment equipment |
| CN113318514B (en) * | 2021-08-04 | 2021-09-28 | 江苏拓邦环保科技有限公司 | Changeable filter core sewage preliminary treatment equipment |
| CN114275922A (en) * | 2022-01-26 | 2022-04-05 | 广东欣美技术股份有限公司 | Vortex type water purifying device |
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Application publication date: 20200814 |
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| WW01 | Invention patent application withdrawn after publication |