CN106267982A - A kind of ceramic distributing valve device of filter - Google Patents
A kind of ceramic distributing valve device of filter Download PDFInfo
- Publication number
- CN106267982A CN106267982A CN201610913321.XA CN201610913321A CN106267982A CN 106267982 A CN106267982 A CN 106267982A CN 201610913321 A CN201610913321 A CN 201610913321A CN 106267982 A CN106267982 A CN 106267982A
- Authority
- CN
- China
- Prior art keywords
- hole
- price fixing
- filter
- distribution
- distributing valve
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
- B01D33/17—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with rotary filtering tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
- B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/80—Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K21/00—Fluid-delivery valves, e.g. self-closing valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filtration Of Liquid (AREA)
Abstract
The present invention provides the ceramic distributing valve device of a kind of filter, is arranged on filter；It is disk structure including distribution Moving plate and distribution price fixing, described distribution Moving plate and distribution price fixing；Described distribution Moving plate and distribution price fixing are for being coaxially disposed；The dispensing orifice that described distribution Moving plate is arranged circumferentially arranged with circular array；Circumferentially arranged with midge hole on described distribution price fixing, it is dried hole and recoil hole；It is additionally provided with between described recoil hole and dry hole and unloads hole for being passed through compressed-air actuated blowing in described dispensing orifice.The present invention adds Chui Xie Kong Hechuixie district on distribution price fixing, by introducing the gas of relatively strong pressure, is full of rapidly the screen plate of vacuum so that the filter cake pug of fine size can also peel off screen plate easily, it is easier to scrapes.
Description
Technical field
The present invention relates to ore pulp and pug class substance dehydrates equipment and the field of device, be specifically related to a kind of various pug
The ceramic distributing valve device of filter.
Background technology
The ceramic distributing valve of ore pulp pug filter the most on the market, as disclosed in Publication No. CN104524851
Patent documentation.As shown in Figure 1 to Figure 3, being typically made up of distribution Moving plate 1' and distribution price fixing 2', distribution Moving plate 1' is by pipeline
Being communicated on each screen plate, distribution price fixing 2' is connected to vacuum liquid drainage tar by pipeline.In filter, distribute Moving plate 1'
Being to be bonded and fixed in the rotating shaft at rotating cylinder center, general ceramic wafer filter often encloses and has 12 fan plates, so distribution Moving plate 1'
On also have the dispensing orifice 11' of 12 corresponding connections therewith.Distribution price fixing 2' on be typically provided 3 holes, be followed successively by midge hole 21',
It is dried hole 22' and recoil hole 23'.The position of distributing valve correspondence midge hole 21' is placed in slurry storage tank, forms pulp absorbing area；Point
Join valve correspondence to be dried the position of hole 22' and be placed in above slurry storage tank, form dry section；Midge hole 21' is by midge vacuum
Pipe 3' is connected with vacuum system, is dried hole 22' and is connected with vacuum system by dry vacuum tube 4', and recoil hole 23' is
It is connected with recoil tube backpurge system.When filtering table goes to pulp absorbing area, adsorbing slurry under the vacuum pressures, moisture content passes through filtering table
Discharging, solid material is trapped within filtering table surface；When filtering table continues to go to exsiccator, the part having adsorbed mud has turned to
Leave the liquid level in slurry storage tank, continue dehydration under vacuum, form mud cake；Filtering table continues to go at scraper, mud
Cake is just scraped.
Existing ceramic distributing valve there is a disadvantage in that
First, the design of distribution price fixing and distribution Moving plate is unreasonable, and steam passes through distribution under the suction of negative pressure of vacuum
The resistance during passage of the fixed and moving dish of valve is very big, and pipeline has some setbacks, and there is clearly bottleneck.
Next to that, when filter is used for filtering ore pulp or pug, the goo such as mud class that screen plate adsorption particle is the thinnest
During material, just it is difficult to use scraper discharging with above-mentioned traditional distributing valve.Reason is that material itself is the most viscous, and material particles is very
Thin more than 1000 mesh that even reach, therefore the most almost live the face seal of whole filtering table after filtering table turns up, so
When forwarding the recoil hole of correspondence to, it is difficult to drain the vacuum of screen plate intracavity.
3rd is, such as Fig. 2 and Fig. 3, due to the midge hole on price fixing, is dried hole and 12 on Kong Yaoyu Moving plate that recoil
Hole timesharing connection, so being needed to turn round and narrow towards water (gas) road of Moving plate by distribution price fixing, thus dynamic in distribution
Dish and distribution price fixing junction often leak air, leak and bottleneck.
Summary of the invention
It is an object of the invention to, it is provided that the ceramic distributing valve device of a kind of novel filter, solve above-mentioned existing
Defect present in technology.The present invention adopts the following technical scheme that
The ceramic distributing valve device of a kind of filter, is arranged on filter；Including distribution Moving plate and distribution price fixing, institute
State distribution Moving plate and distribution price fixing is disk structure；Described distribution Moving plate and distribution price fixing are for being coaxially disposed；Described distribution
The dispensing orifice that Moving plate is arranged circumferentially arranged with circular array；On described distribution price fixing circumferentially arranged with midge hole, be dried hole and
Recoil hole；Especially: be additionally provided with between described recoil hole and dry hole for being passed through compressed-air actuated blowing in described dispensing orifice
Unload hole.
It is preferred that midge hole and dry hole on described distribution price fixing are the strip arcuate socket that area is bigger；Described instead
Punching and blow and unload hole and be the less circle of area or slotted eye.
Blow described in it is preferred that to unload the length x width in hole be 20mm ± 1mm × 3mm ± 2mm.
It is preferred that the bottom of described distribution price fixing connects the first connecting tube and the second connecting tube；Described first connecting tube
One end with described blow unload hole and recoil hole connect, the other end is connected with backpurge system；One end of described second connecting tube and institute
State midge hole to connect with dry hole；Described second connecting tube is for being connected with vacuum system.Described first connecting tube is preferably circle
Cylinder.Described second connecting tube preferably its section is trapezoidal, its wider one end be connected to described distribution price fixing bottom,
Connecting with midge hole and dry hole, its narrower one end is connected with described vacuum system.
It is preferred that described distribution price fixing is provided with the first pressure regulation blowing the gas pressure unloaded in hole for regulating entrance
Valve；The second pressure-regulating valve for regulating the fluid pressure entering recoil hole it is additionally provided with on described distribution price fixing.
It is preferred that described distribution price fixing according to midge hole, be dried hole, blow unload hole and recoil place, hole position, accordingly
It is divided into pulp absorbing area, dry section, Chui Xie district and recoil district.
The operation principle of the present invention is: when screen plate goes to distribute the pulp absorbing area on price fixing, due to the vacuum in midge hole
Pressure, adsorbs the mud in slurry pool on screen plate；When screen plate is rotated further the dry section to distribution price fixing, it is dried
Evacuation is continued in hole so that the slurry dewatering on screen plate forms filter cake；Screen plate is rotated further blowing to distribution price fixing and unloads
District, long and narrow blowing blow out the gas that pressure is bigger, the vacuum in screen plate of draining rapidly, lower filter cake and screen plate in unloading hole
Between absorption affinity, make filter cake separate with screen plate, then filter cake just can come off easily through scraper；Screen plate be rotated further to
Recoil district on distribution price fixing, in recoil hole, the pug being blocked in capillary tube or do not scrape is cleaned by back-flushing further, can
Prevent the pug blocking screen plate of fine size.
The beneficial effects of the present invention is: first, on the basis of existing technology reasonable design distribution price fixing and distribution
Moving plate, adds Chui Xie Kong Hechuixie district on distribution price fixing, by introducing the gas of relatively strong pressure, is full of rapidly the mistake of vacuum
Filter plate so that the filter cake pug of fine size can also peel off screen plate easily, it is easier to scrapes.Secondly, connection midge is improved
The contour structures of first connecting tube in hole and dry hole.Traditional connecting pipe structure is cylinder, during water-pumping/draining, fixed in distribution
The easy moisture retention performance of edge of the bottom of dish, reduction filter efficiency, even easily go out with connecting tube joint at distribution price fixing
The phenomenon now leak gas, leaked.The structure of connecting tube is changed into boring column by the present invention, both can strengthen the efficiency of pump drainage, it is possible to fall
Low-loss and energy consumption.
Accompanying drawing explanation
Fig. 1 is price fixing and the Moving plate structure of the distributing valve of prior art；
Fig. 2 is the price fixing of the distributing valve of prior art and Moving plate assemble after structure；
Fig. 3 is the connecting pipe structure of the distributing valve of prior art；
Fig. 4 is the distribution Moving plate structure of embodiment distributing valve；
Fig. 5 is the distribution price fixing structure of embodiment distributing valve；
Fig. 6 is the distribution Moving plate of embodiment distributing valve and distributes the structure after price fixing assembles；
Fig. 7 is the connecting pipe structure of the distributing valve of embodiment；
Reference: 1'-distributes Moving plate；11'-dispensing orifice；2'-distributes price fixing；21'-midge hole；22'-is dried hole；
23'-recoils hole；3'-midge vacuum tube；4'-is dried vacuum tube；5'-recoil tube；
1-distributes Moving plate；11-dispensing orifice；2-distributes price fixing；21-midge hole；22-is dried hole；23-blows and unloads hole；24-recoils
Hole；3-pulp absorbing area；4-dry section；5-Chui Xie district；51-the first pressure-regulating valve；6-recoils district；61-the second pressure-regulating valve；7-
First connecting tube；8-the second connecting tube.
Detailed description of the invention
The detailed description of the invention of the present invention be expanded on further below in conjunction with accompanying drawing:
Such as Fig. 4 to Fig. 7, the ceramic distributing valve device of a kind of filter, it is arranged on filter；Including distribution Moving plate 1
It is disk structure with distribution price fixing 2, described distribution Moving plate 1 and distribution price fixing 2.
Such as Fig. 4, described distribution Moving plate 1 is provided with dispensing orifice 11,12 dispensing orifices 11 and mistakes that 12 annular arrays are arranged
12 pieces of screen plate one_to_one corresponding on each filtering table of filter plate machine.
Such as Fig. 5, described distribution price fixing 2 be provided with the midge hole 21 of arc strip, the dry hole 22 of arc strip, with
And the rotund recoil hole 24 being arranged between dry hole 22 and midge hole 21；Especially, in described recoil hole 24 with dry
It is additionally provided with narrow and long and narrow blowing between hole 22 and unloads hole 23.It is 20mm × 2mm that blowing in the present embodiment unloads the length x width in hole 23.
According to midge hole 21, dry hole 22 on distribution price fixing 2, blowing and unload hole 23 and the position in recoil hole 24, correspondence is divided into
Pulp absorbing area 3, dry section 4, Chui Xie district 5 and recoil 6.On distribution price fixing 2, it is provided with for regulating entrance near hole 23 blowing to unload
Blow the first pressure-regulating valve 51 of the gas pressure unloaded in hole 23；It is provided with near recoil hole 24 for regulating entrance recoil hole
Second pressure-regulating valve 61 of the fluid pressure of 24；It is provided with near midge hole 21 for regulating the evacuation at midge hole 21
3rd pressure-regulating valve 31 of pressure；Be provided with near dry hole 22 for regulate evacuated pressure at dry hole 22
Four pressure-regulating valves 41.
Described midge hole 21 and dry hole 22 are by pipeline connection vacuum pump, and midge hole 21 is used for making screen plate adsorb
Slurry, is dried hole 22 for making the dehydration of the slurry on screen plate form filter cake；Described blowing unloads hole 23 and recoil hole 24 is logical
Cross pipeline and connect gasing pump and infusion pump, blow and unload hole 23 and make filter cake for the compressed air being passed through pressure bigger on screen plate
It is rapidly separated with screen plate, the pug recoil that recoil hole 24 makes to remain in screen plate for being passed through recoil liquid on screen plate
Come out.
Such as Fig. 6, described distribution price fixing 2 is mounted on the dispensing head of filter, and described distribution Moving plate 1 is mounted in institute
State on distribution price fixing 2.After assembling, the part dispensing orifice 11 on distribution Moving plate 1 is mutual with the midge hole 21 on distribution price fixing
Overlap, the part dispensing orifice 11 on distribution Moving plate 1 overlaps each other with the dry hole 22 on distribution price fixing, the portion on distribution Moving plate 1
Divide dispensing orifice 11 to unload hole 23 with blowing on distribution price fixing to overlap each other, the part dispensing orifice 11 on distribution Moving plate 1 and distribution price fixing
On recoil hole 24 overlap each other.During work, distribution Moving plate 1 relative distribution price fixing 2 rotates, and it is fixed that dispensing orifice 11 sequentially passes through distribution
Pulp absorbing area 3, dry section 4, Chui Xie district 5 and recoil district 6 on dish 2.Screen plate is when pulp absorbing area 3, and vacuum pump works, and makes screen plate
Under the vacuum pressures the pug in slurry tank is adsorbed；When screen plate enters dry section 4, vacuum pump works on, and makes pug take off
Water forms filter cake；When screen plate enters Chui Xie district 5, vacuum pump quits work, and gasing pump works, quilt rapidly in the screen plate of vacuum
Gases at high pressure are filled with, and make filter cake separate with screen plate, are provided with scraper on the surface in Chui Xie district 5, and scraper easily can be clean by filter cake
Scrape；When screen plate enters recoil district 6, gasing pump quits work, and infusion pump works and is passed through the water of backwash in screen plate,
The pug residue remained in screen plate is cleaned out by the liquid of recoil, it is to avoid blocking screen plate.
Such as Fig. 7, further, blow described in and unload hole 23 and be provided with, with the lower section in recoil hole 24, the first company connect with both respectively
Adapter 7, described first connecting tube 7 is for being connected with gasing pump and infusion pump.Described midge hole 21 and the lower section in dry hole 22
Being provided with the second connecting tube 8 connected respectively with both, described second connecting tube 8 is for being connected with vacuum pump.Described second connects
The section of pipe 8 is wide at the top and narrow at the bottom trapezoidal, and its wider one end is connected on described midge hole 21 and dry hole 22.
Claims (9)
1. a ceramic distributing valve device for filter, is arranged on filter；Including distribution Moving plate and distribution price fixing, described
Distribution Moving plate and distribution price fixing are disk structure；Described distribution Moving plate and distribution price fixing are for being coaxially disposed；Described distribution is moved
The dispensing orifice that dish is arranged circumferentially arranged with circular array；Circumferentially arranged with midge hole on described distribution price fixing, it is dried hole and anti-
Punching；It is characterized in that: be additionally provided with for being passed through in described dispensing orifice compressed-air actuated between described recoil hole and dry hole
Blow and unload hole.
The ceramic distributing valve device of a kind of filter the most according to claim 1, it is characterised in that: described distribution price fixing
On midge hole and dry hole be the strip arcuate socket that area is bigger；Described recoil hole and blow and unload hole and be the circle that area is less
Shape or slotted eye.
The ceramic distributing valve device of a kind of filter the most according to claim 1, it is characterised in that blow described in: and unload hole
Length x width is 20mm ± 1mm × 3mm ± 2mm.
The ceramic distributing valve device of a kind of filter the most according to claim 1, it is characterised in that: described distribution price fixing
Bottom connect have the first connecting tube and the second connecting tube；Hole and recoil Kong Lian are unloaded with described blowing in one end of described first connecting tube
Logical, the other end is connected with backpurge system；One end of described second connecting tube connects with described midge hole and dry hole；Described second
Connecting tube is for being connected with vacuum system.
The ceramic distributing valve device of a kind of filter the most according to claim 4, it is characterised in that: described first connects
Pipe is cylindrical tube.
The ceramic distributing valve device of a kind of filter the most according to claim 4, it is characterised in that: described second connects
The section of pipe is trapezoidal, and its wider one end is connected to the bottom of described distribution price fixing and connects with midge hole and dry hole, and it is relatively
Narrow one end is connected with described vacuum system.
The ceramic distributing valve device of a kind of filter the most according to claim 1, it is characterised in that: described distribution price fixing
It is provided with the first pressure-regulating valve blowing the gas pressure unloaded in hole for regulating entrance.
The ceramic distributing valve device of a kind of filter the most according to claim 1, it is characterised in that: described distribution price fixing
On be additionally provided with for regulating the second pressure-regulating valve of fluid pressure entering recoil hole.
The ceramic distributing valve device of a kind of filter the most according to claim 1, it is characterised in that: described distribution price fixing
According to midge hole, be dried hole, blow unload hole and recoil place, hole position, be divided into accordingly pulp absorbing area, dry section, Chui Xie district and
Recoil district.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610913321.XA CN106267982A (en) | 2016-10-19 | 2016-10-19 | A kind of ceramic distributing valve device of filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610913321.XA CN106267982A (en) | 2016-10-19 | 2016-10-19 | A kind of ceramic distributing valve device of filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106267982A true CN106267982A (en) | 2017-01-04 |
Family
ID=57719759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610913321.XA Pending CN106267982A (en) | 2016-10-19 | 2016-10-19 | A kind of ceramic distributing valve device of filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106267982A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106964191A (en) * | 2017-04-27 | 2017-07-21 | 王芹 | Application of the disk vacuum filter in Chinese medicine or grease production |
| CN113426191A (en) * | 2021-07-07 | 2021-09-24 | 李泽昊 | Cleaning method for filter plate of ceramic filter |
| CN114653125A (en) * | 2021-04-07 | 2022-06-24 | 山东孚德环保有限公司 | Ceramic filter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2143742A (en) * | 1977-06-22 | 1985-02-20 | Idrex | Vertical filter system |
| CN2128554Y (en) * | 1992-07-22 | 1993-03-24 | 张宏远 | Distributing head of disc vacuum filter |
| CN203990047U (en) * | 2014-07-31 | 2014-12-10 | 王伟勇 | Disk vacuum filter |
| CN104524851A (en) * | 2015-01-09 | 2015-04-22 | 云南大红山管道有限公司 | Backflushing area position adjustment device for ceramic filter |
| CN105088844A (en) * | 2014-05-16 | 2015-11-25 | 中国联合装备集团安阳机械有限公司 | Multi-disc vacuum pulp washer |
| CN204841130U (en) * | 2015-07-21 | 2015-12-09 | 广西农垦糖业集团红河制糖有限公司 | Rotary vacuum filter with mud function is unloaded in blowback |
| CN206198827U (en) * | 2016-10-19 | 2017-05-31 | 佛山市绿星环保科技有限公司 | A kind of New Type of Filter Equipment distribution valve gear |
-
2016
- 2016-10-19 CN CN201610913321.XA patent/CN106267982A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2143742A (en) * | 1977-06-22 | 1985-02-20 | Idrex | Vertical filter system |
| CN2128554Y (en) * | 1992-07-22 | 1993-03-24 | 张宏远 | Distributing head of disc vacuum filter |
| CN105088844A (en) * | 2014-05-16 | 2015-11-25 | 中国联合装备集团安阳机械有限公司 | Multi-disc vacuum pulp washer |
| CN203990047U (en) * | 2014-07-31 | 2014-12-10 | 王伟勇 | Disk vacuum filter |
| CN104524851A (en) * | 2015-01-09 | 2015-04-22 | 云南大红山管道有限公司 | Backflushing area position adjustment device for ceramic filter |
| CN204841130U (en) * | 2015-07-21 | 2015-12-09 | 广西农垦糖业集团红河制糖有限公司 | Rotary vacuum filter with mud function is unloaded in blowback |
| CN206198827U (en) * | 2016-10-19 | 2017-05-31 | 佛山市绿星环保科技有限公司 | A kind of New Type of Filter Equipment distribution valve gear |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106964191A (en) * | 2017-04-27 | 2017-07-21 | 王芹 | Application of the disk vacuum filter in Chinese medicine or grease production |
| CN114653125A (en) * | 2021-04-07 | 2022-06-24 | 山东孚德环保有限公司 | Ceramic filter |
| CN113426191A (en) * | 2021-07-07 | 2021-09-24 | 李泽昊 | Cleaning method for filter plate of ceramic filter |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170104 |
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| RJ01 | Rejection of invention patent application after publication |