CN105937628A - Double-filtration stop valve - Google Patents
Double-filtration stop valve Download PDFInfo
- Publication number
- CN105937628A CN105937628A CN201610473856.XA CN201610473856A CN105937628A CN 105937628 A CN105937628 A CN 105937628A CN 201610473856 A CN201610473856 A CN 201610473856A CN 105937628 A CN105937628 A CN 105937628A
- Authority
- CN
- China
- Prior art keywords
- valve
- flap
- valve body
- mounting ring
- stop 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
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000012528 membrane Substances 0.000 claims description 23
- 238000012856 packing Methods 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 8
- 238000009825 accumulation Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 2
- 238000011109 contamination Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000012535 impurity Substances 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 2
- 102000010970 Connexin Human genes 0.000 description 1
- 108050001175 Connexin Proteins 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 210000003976 gap junction Anatomy 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000247 postprecipitation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
- B01D35/046—Plug, tap, or cock filters filtering elements mounted in or on a faucet the filtering element being mounted in the faucet plug
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/48—Attaching valve members to screw-spindles
-
- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift 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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention discloses a double-filtration stop valve. The double-filtration stop valve comprises a valve body, a valve lid, a valve rod, a valve flap and a hand wheel, wherein the valve lid is installed on the valve body, the valve flap is installed inside the valve body, one end of the valve rod is connected with the hand wheel while the other end of the valve rod stretches into the valve body and is connected with the valve flap, the valve body is internally provided with a water inflow channel and a water outflow channel, the valve flap and a water outlet of the water inflow channel are sealed, and both a water inlet of the water inflow channel and a water outlet of the water outflow channel are embedded with filters. Each filter comprises an installation ring, a filtering net and a filtering film, wherein the installation ring is provided with a concave stage, and the filtering film is embedded into the concave stage through the filtering net and is fixed on the installation ring. The double-filtration stop valve is simple in structure and convenient to manufacture, contamination and accumulation inside the stop valve are prevented, a filtering function is added, conduction of following processes is guaranteed, and the service life of the stop valve is prolonged at the same time.
Description
Technical field
The present invention relates to valve field, particularly relate to a kind of double filtration stop valve.
Background technology
The opening and closing element of stop valve is the flap of stopper, and sealing surface is plane or the conical surface, and flap is for linear motion along the centrage of valve seat.The forms of motion of valve rod, also has lifting rotation rod-type, and stop valve refers to the valve that flap moves along valve seat centrage.Due to the valve rod of such valve, to be turned on and off stroke relatively short, and has cutting function very reliably, again due to change and the stroke direct proportionality of flap of valve seat port, is very suitable for the regulation to flow.Therefore, such stop valve valve that dams is highly suitable as cutting off or regulating and throttling use.
At present, stop valve is in use, due to meeting residual impurity general in the medium of circulation, impurity easily residues in valve body gap, if things go on like this stop valve inside can be polluted and pile up, the situation causing stop valve blocked and to scrap, there will be residual impurity simultaneously in stop valve out medium equally, have impact on the carrying out of subsequent technique.
Such as the Chinese invention patent " stop valve " of Patent No. 201520443043.7, disclosing a kind of stop valve and include valve body, valve gap, valve rod, flap and handwheel, valve gap is for being provided with convex annular edge, described convex annular with the side of valve body laminating
The cross section on edge is isosceles trapezoidal structure, the upper bottom surface of this isosceles trapezoid is arranged at the opposite side of relative valve gap, the Surface coating elasticity layer on described convex annular edge, described valve body is provided with convex annular along adaptive cannelure for the side of valve gap of fitting, and the inner chamber of described valve body is provided with for intercepting impurity contact valve body and the baffling device of valve gap junction in medium at valve gap.The existence of this patent is disadvantageous in that: does not has any process for pollution and accumulation source, can form new accumulation, be therefore not suitable for popularizing on baffling device.
Summary of the invention
It is an object of the invention to the problems referred to above overcoming prior art to exist, propose a kind of double filtration stop valve.Present configuration is simple, easily manufactured, effectively prevent the internal situation occurring polluting and piling up of stop valve and occurs, adds filtering function, it is ensured that the carrying out of subsequent technique, extend the service life of stop valve simultaneously.
The present invention realizes by the following technical solutions:
Double filtration stop valves, including valve body, valve gap, valve rod, flap and hands wheel, described valve gap is arranged on valve body, described flap is arranged in valve body, one end of described valve rod is connected with handwheel, one end of described valve rod is connected with flap in stretching into valve body, intake tunnel and exhalant canal it is provided with in described valve body, described flap forms sealing with the outlet of intake tunnel, it is characterized in that: the water inlet of described intake tunnel and the outlet of exhalant canal are all embedded with filter, described filter includes mounting ring, drainage screen and filter membrane, described mounting ring is provided with concave station, described filter membrane is fixed in mounting ring in embedding concave station by drainage screen.
Described mounting ring is provided with the spring cavity of symmetry, spring and fixture block it is provided with in spring cavity, one end of described spring is fixed in the cavity wall of spring cavity, the other end is connected with fixture block, the conduit wall of described intake tunnel be equipped with the draw-in groove corresponding with fixture block on the conduit wall of exhalant canal, described mounting ring is embedded in draw-in groove by fixture block and is arranged on conduit wall.
Described valve gap is provided with packing cavity and follower, and follower is arranged on packing cavity, and described valve rod sequentially passes through follower and packing cavity stretches into and is connected with flap.
It is provided with filler in described packing cavity.
Described flap is provided with slot, and described valve rod is fixed with flap in inserting slot.
It is provided with spacer ring between described drainage screen and filter membrane.
The present invention compared with prior art, has an advantage in that:
1, present configuration is simple, easily manufactured, effectively prevent the internal situation occurring polluting and piling up of stop valve and occurs, adds filtering function, it is ensured that the carrying out of subsequent technique, extend the service life of stop valve simultaneously.
2, the present invention uses the water inlet of intake tunnel to be embedded with filter, described filter includes mounting ring, drainage screen and filter membrane, described mounting ring is provided with concave station, described filter membrane is fixed in mounting ring in embedding concave station by drainage screen, use drainage screen can filter out bulk granule present in water, by filter membrane, fine particle is filtered again, ensure that inside stop valve not by pollution and the accumulation of residual impurity, also ensure that the carrying out of subsequent technique, filter membrane can be also used for filtering microorganism and antibacterial, it is ensured that the quality of water.
3, the present invention uses the water inlet of exhalant canal to be embedded with filter, described filter includes mounting ring, drainage screen and filter membrane, described mounting ring is provided with concave station, described filter membrane is fixed in mounting ring in embedding concave station by drainage screen, after flap is closed, the water outlet of intake tunnel moves due to water retention fluid stopping, and the water after filtering precipitation slowly occurs or piles up due to long-term static meeting, postprecipitation opened by stop valve or accumulation can directly be gone out, and affects subsequent technique；Use after the water inlet of exhalant canal is embedded with filter, precipitate or accumulation can be blocked, through the drive of the flow velocity of follow-up water, precipitate or after accumulation can gradually decompose the size reaching filtering requirement, flow out through filter, carry out of subsequent technique has been effectively ensured.
4, the present invention uses described mounting ring to be provided with the spring cavity of symmetry, spring and fixture block it is provided with in spring cavity, one end of described spring is fixed in the cavity wall of spring cavity, the other end is connected with fixture block, and the wall of described intake tunnel is provided with the draw-in groove corresponding with fixture block, and described mounting ring is arranged on intake tunnel in embedding draw-in groove by fixture block, simple in construction, mount and dismount very convenient, it is simple to cleaning and the replacing to filter, extend the service life of stop valve further.
5, the present invention uses described valve gap to be provided with packing cavity and follower, and follower is arranged on packing cavity, and described valve rod sequentially passes through follower and packing cavity stretches into and is connected with flap, improves the sealing between valve body and valve rod.
6, the present invention is provided with filler in using described packing cavity, further increases the sealing between valve body and valve rod.
7, the present invention uses described flap to be provided with slot, and described valve rod is fixed with flap in inserting slot, and the setting of slot facilitates the installation of valve rod and fixes, easy to operate, stabilized structure.
8, the present invention uses and is provided with spacer ring between described drainage screen and filter membrane, and spacer ring can effectively prevent drainage screen from being hooked by filter membrane, causes the situation that filter membrane damages.
9, overall structure of the present invention is simple, and dismantles and safeguard very convenient, is particularly well-suited to popularize.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram.
Fig. 2 is the structural representation of filter of the present invention.
Fig. 3 is the structural representation of mounting ring of the present invention.
Fig. 4 is the structural representation of the embodiment of the present invention 3 filter.
Labelling in figure: 1, valve body, 2, valve gap, 3, valve rod, 4, flap, 5, handwheel, 6, intake tunnel, 7, exhalant canal, 8, filter, 9, follower, 10, filler, 81, mounting ring, 82, drainage screen, 83, filter membrane, 84, concave station, 85, spring cavity, 86, spring, 87, fixture block, 88, spacer ring.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further detailed:
Embodiment 1:
Double filtration stop valves, including valve body 1, valve gap 2, valve rod 3, flap 4 and handwheel 5, described valve gap 2 is arranged on valve body 1, described flap 4 is arranged in valve body 1, one end of described valve rod 3 is connected with handwheel 5, one end of described valve rod 3 is connected with flap 4 in stretching into valve body 1, intake tunnel 6 and exhalant canal 7 it is provided with in described valve body 1, described flap 4 forms sealing with the outlet of intake tunnel 6, the water inlet of described intake tunnel 6 and the outlet of exhalant canal 7 are all embedded with filter 8, described filter 8 includes mounting ring 81, drainage screen 82 and filter membrane 83, described mounting ring 81 is provided with concave station 84, described filter membrane 83 is fixed in mounting ring 81 in embedding concave station 84 by drainage screen 82.
In the present invention, described mounting ring 81 is provided with the spring cavity 85 of symmetry, spring 86 and fixture block 87 it is provided with in spring cavity 85, one end of described spring 86 is fixed in the cavity wall of spring cavity 85, the other end is connected with fixture block 87, being equipped with the draw-in groove corresponding with fixture block 87 on the conduit wall of described intake tunnel 6 and the conduit wall of exhalant canal 7, described mounting ring 81 is arranged on conduit wall in embedding draw-in groove by fixture block 87.
Embodiment 2:
Double filtration stop valves, including valve body 1, valve gap 2, valve rod 3, flap 4 and handwheel 5, described valve gap 2 is arranged on valve body 1, described flap 4 is arranged in valve body 1, one end of described valve rod 3 is connected with handwheel 5, one end of described valve rod 3 is connected with flap 4 in stretching into valve body 1, intake tunnel 6 and exhalant canal 7 it is provided with in described valve body 1, described flap 4 forms sealing with the outlet of intake tunnel 6, the water inlet of described intake tunnel 6 and the outlet of exhalant canal 7 are all embedded with filter 8, described filter 8 includes mounting ring 81, drainage screen 82 and filter membrane 83, described mounting ring 81 is provided with concave station 84, described filter membrane 83 is fixed in mounting ring 81 in embedding concave station 84 by drainage screen 82.
In the present invention, described mounting ring 81 is provided with the spring cavity 85 of symmetry, spring 86 and fixture block 87 it is provided with in spring cavity 85, one end of described spring 86 is fixed in the cavity wall of spring cavity 85, the other end is connected with fixture block 87, being equipped with the draw-in groove corresponding with fixture block 87 on the conduit wall of described intake tunnel 6 and the conduit wall of exhalant canal 7, described mounting ring 81 is arranged on conduit wall in embedding draw-in groove by fixture block 87.
In the present embodiment, described valve gap 2 is provided with packing cavity and follower 9, and follower 9 is arranged on packing cavity, and described valve rod 3 sequentially passes through follower 9 and packing cavity stretches into and is connected with flap 4.
In the present embodiment, in described packing cavity, it is provided with filler 10.
Embodiment 3:
Double filtration stop valves, including valve body 1, valve gap 2, valve rod 3, flap 4 and handwheel 5, described valve gap 2 is arranged on valve body 1, described flap 4 is arranged in valve body 1, one end of described valve rod 3 is connected with handwheel 5, one end of described valve rod 3 is connected with flap 4 in stretching into valve body 1, intake tunnel 6 and exhalant canal 7 it is provided with in described valve body 1, described flap 4 forms sealing with the outlet of intake tunnel 6, the water inlet of described intake tunnel 6 and the outlet of exhalant canal 7 are all embedded with filter 8, described filter 8 includes mounting ring 81, drainage screen 82 and filter membrane 83, described mounting ring 81 is provided with concave station 84, described filter membrane 83 is fixed in mounting ring 81 in embedding concave station 84 by drainage screen 82.
In the present invention, described mounting ring 81 is provided with the spring cavity 85 of symmetry, spring 86 and fixture block 87 it is provided with in spring cavity 85, one end of described spring 86 is fixed in the cavity wall of spring cavity 85, the other end is connected with fixture block 87, being equipped with the draw-in groove corresponding with fixture block 87 on the conduit wall of described intake tunnel 6 and the conduit wall of exhalant canal 7, described mounting ring 81 is arranged on conduit wall in embedding draw-in groove by fixture block 87.
In the present embodiment, described valve gap 2 is provided with packing cavity and follower 9, and follower 9 is arranged on packing cavity, and described valve rod 3 sequentially passes through follower 9 and packing cavity stretches into and is connected with flap 4.
In the present embodiment, in described packing cavity, it is provided with filler 10.
In the present embodiment, described flap 4 is provided with slot, and described valve rod 3 is fixed with flap 4 in inserting slot.
In the present embodiment, between described drainage screen 82 and filter membrane 83, it is provided with spacer ring 88.
The invention is not restricted to above-described embodiment, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (6)
- null1. pair filtration stop valve，Including valve body (1)、Valve gap (2)、Valve rod (3)、Flap (4) and handwheel (5)，Described valve gap (2) is arranged on valve body (1)，Described flap (4) is arranged in valve body (1)，One end of described valve rod (3) is connected with handwheel (5)，One end of described valve rod (3) is connected with flap (4) in stretching into valve body (1)，Intake tunnel (6) and exhalant canal (7) it is provided with in described valve body (1)，Described flap (4) forms sealing with the outlet of intake tunnel (6)，It is characterized in that: the water inlet of described intake tunnel (6) and the outlet of exhalant canal (7) are all embedded with filter (8)，Described filter (8) includes mounting ring (81)、Drainage screen (82) and filter membrane (83)，Described mounting ring (81) is provided with concave station (84)，Described filter membrane (83) is fixed in mounting ring (81) in embedding concave station (84) by drainage screen (82).
- Double filtration stop valve the most according to claim 1, it is characterized in that: described mounting ring (81) is provided with the spring cavity (85) of symmetry, spring (86) and fixture block (87) it is provided with in spring cavity (85), one end of described spring (86) is fixed in the cavity wall of spring cavity (85), the other end is connected with fixture block (87), being equipped with the draw-in groove corresponding with fixture block (87) on the conduit wall of described intake tunnel (6) and the conduit wall of exhalant canal (7), described mounting ring (81) is arranged on conduit wall in embedding draw-in groove by fixture block (87).
- Double filtration stop valve the most according to claim 1, it is characterized in that: described valve gap (2) is provided with packing cavity and follower (9), follower (9) is arranged on packing cavity, and described valve rod (3) sequentially passes through follower (9) and packing cavity stretches into and is connected with flap (4).
- Double filtration stop valve the most according to claim 3, it is characterised in that: it is provided with filler (10) in described packing cavity.
- Double filtration stop valve the most according to claim 1, it is characterised in that: described flap (4) is provided with slot, and described valve rod (3) is fixed with flap (4) in inserting slot.
- Double filtration stop valve the most according to claim 1, it is characterised in that: it is provided with spacer ring (88) between described drainage screen (82) and filter membrane (83).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610473856.XA CN105937628A (en) | 2016-06-27 | 2016-06-27 | Double-filtration stop valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610473856.XA CN105937628A (en) | 2016-06-27 | 2016-06-27 | Double-filtration stop valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105937628A true CN105937628A (en) | 2016-09-14 |
Family
ID=56872066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610473856.XA Pending CN105937628A (en) | 2016-06-27 | 2016-06-27 | Double-filtration stop valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105937628A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001166A (en) * | 2021-11-19 | 2022-02-01 | 江苏永丰电器仪表有限公司 | Anti-blocking straight-through stop valve with multi-stage filtration processing function |
| CN114087375A (en) * | 2021-11-23 | 2022-02-25 | 富山阀门实业(东台)有限公司 | Stop valve with high sealing performance |
| CN115479157A (en) * | 2022-10-18 | 2022-12-16 | 温州欧建阀门有限公司 | Stop valve with ribs |
| CN116592148A (en) * | 2023-05-09 | 2023-08-15 | 蚌埠学院 | Liquid flow control device and control method thereof |
-
2016
- 2016-06-27 CN CN201610473856.XA patent/CN105937628A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001166A (en) * | 2021-11-19 | 2022-02-01 | 江苏永丰电器仪表有限公司 | Anti-blocking straight-through stop valve with multi-stage filtration processing function |
| CN114087375A (en) * | 2021-11-23 | 2022-02-25 | 富山阀门实业(东台)有限公司 | Stop valve with high sealing performance |
| CN115479157A (en) * | 2022-10-18 | 2022-12-16 | 温州欧建阀门有限公司 | Stop valve with ribs |
| CN116592148A (en) * | 2023-05-09 | 2023-08-15 | 蚌埠学院 | Liquid flow control device and control method thereof |
| CN116592148B (en) * | 2023-05-09 | 2024-01-09 | 蚌埠学院 | Liquid flow control device and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160914 |
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| WD01 | Invention patent application deemed withdrawn after publication |