CN106765384A - A kind of perforated microstructure low noise lampblack absorber - Google Patents
A kind of perforated microstructure low noise lampblack absorber Download PDFInfo
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- CN106765384A CN106765384A CN201611159378.1A CN201611159378A CN106765384A CN 106765384 A CN106765384 A CN 106765384A CN 201611159378 A CN201611159378 A CN 201611159378A CN 106765384 A CN106765384 A CN 106765384A
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- noise
- microperforated panel
- lampblack absorber
- low noise
- casing assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a kind of perforated microstructure low noise lampblack absorber, including：One exhaust fume collecting hood component；Filter screen guard is provided with exhaust fume collecting hood component；One casing assembly；Casing assembly is arranged on exhaust fume collecting hood component；Host panel is provided with outside casing assembly；A check-valves is provided with the top of casing assembly；One ducting assembly；Ducting assembly is arranged on inside casing assembly；Two air inlets and an air outlet are provided with ducting assembly, the axis horizontal where two air inlets is set, the axis where air outlet is set perpendicular to the axis where air inlet；One group of integrated form micropunch acoustic absorptive member；Integrated form micropunch acoustic absorptive member is just being arranged in series in the both sides of two air inlets to air inlet；Integrated form micropunch acoustic absorptive member is internally provided with noise resonating cativty.The perforated microstructure low noise lampblack absorber, multilayer microperforated panel noise reduction can widen sound absorption frequency range, it is ensured that the Wind Volume blast high of cigarette machine, while effectively reducing noise.Simple structure, corrosion-resistant, resistance to greasy dirt, long lifespan.
Description
Technical field
It is big more particularly, to a kind of compact conformation, air quantity the present invention relates to lampblack absorber technical field, the small micropunch of noise
Structure low noise lampblack absorber.
Background technology
Present requirement more and more higher of the people to lampblack absorber performance, with the development of science and technology, the airflow pressure of lampblack absorber is got over
More to improve, and constantly reduce a big problem of the cigarette machine noise as the research of cigarette machine.Dress of eliminating the noise is installed in noise transmission approach
It is one of which effectively method to put.Also there is the method that porous material is added by microperforated panel in the prior art, can play
The effect of sqouynd absorption lowering noise.But such method causes complex structure, and high cost, noise reduction lifting is not high enough.
Chinese patent literature（The day for announcing：August 11st is within 2004, notification number：CN2632537）Disclose a kind of for kitchen
The low-noise cooker hood in room, it using the inner shell structure being molded by microperforated panel, be provided with laterally and vertical microperforated panel
Assembling cavity configuration, with the internal layer air draft elbow tubular construction being molded by microperforated panel and Fan casing outer surface be installed with by
The sound-absorbing Rotating fields that sound-absorbing material is constituted, the noise elimination structure of resonant cavity being made up of with corresponding shell body each microperforated panel and suction
The resistance noise reduction structure that sound-absorbing layer is formed, the noise in basic, normal, high whole frequency range produced in the course of the work to smoke exhaust is obtained
Soundproof effect well is obtained, so as to solve the noise problem produced when smoke exhaust is used.
Although above-mentioned technical proposal employs microperforated panel, but each component of above-mentioned technical proposal is hardened using micropunch
Structure so that whole lampblack absorber manufacture is complicated, high cost, and complex structure, is unfavorable for widely using.
The content of the invention
The invention aims to solve to need to use porous material using microperforated panel in the prior art, and
And complex structure, manufacture inconvenience, the problems such as high cost, and providing that a kind of compact conformation is simple, oil resistant is corrosion-resistant, long lifespan, tool
There is Wind Volume blast high, the perforated microstructure low noise lampblack absorber that noise reducing works well.
The technical scheme adopted by the invention for realizing the object of the invention is：A kind of perforated microstructure low noise lampblack absorber, including：
One exhaust fume collecting hood component；Filter screen guard is provided with described exhaust fume collecting hood component；
One casing assembly；Described casing assembly is arranged on exhaust fume collecting hood component；Main frame is provided with outside described casing assembly
Panel；A check-valves is provided with the top of described casing assembly；
One ducting assembly；Described ducting assembly is arranged on inside casing assembly；Two are provided with described ducting assembly to enter
Air port and an air outlet, the axis horizontal where two described air inlets are set, and the axis where described air outlet is vertical
Set in the axis where air inlet；
One group of integrated form micropunch acoustic absorptive member；Described integrated form micropunch acoustic absorptive member is just arranged in series in two to air inlet
The both sides of air inlet；Described integrated form micropunch acoustic absorptive member is internally provided with noise resonating cativty.
The perforated microstructure low noise lampblack absorber, ducting assembly is installed in cigarette machine casing assembly, in cigarette machine casing assembly two
Side is just to two air inlets, the one component integrated form micropunch acoustic absorptive member of series connection on ducting assembly.And in integrated form micropunch
Acoustic absorptive member is internally provided with noise resonating cativty, in use, is made an uproar using the principle reduction of micropunch component acoustic resistance high
Sound, while two groups of micropunch components are connected, sound wave produces resonance in the cavity of noise resonating cativty, increased the frequency range of noise reduction
With the effect of sound absorption, the broadband noise that blower fan sends is absorbed, and part fails the noise sound wave for fully absorbing, can be in the suction of both sides
Multiple reflections back and forth between acoustic form, eliminate the noise so as to play a part of decay.The perforated microstructure low noise lampblack absorber, structure letter
Single, oil resistant is corrosion-resistant, long lifespan, and perforated microstructure does not influence on the air performance of ducting system, it is ensured that cigarette machine it is big
Air quantity blast high, while effectively reducing noise.
Preferably, described integrated form micropunch acoustic absorptive member includes at least two layers of porous plates and one layer of imperforate plate；
Described imperforate plate is set towards casing assembly side, and microperforated panel is set towards air inlet side.Integrated form micropunch absorbs sound
Component sets at least two layers of porous plates and one layer of imperforate plate, and such structure is conducive to sound wave between microperforated panel and micro-
Resonance is formed between perforated plate and imperforate plate, layer by layer noise reducing, increase the frequency range and acoustically effective of noise reduction, absorb what blower fan sent
Broadband noise.Partly fail the noise sound wave for fully absorbing simultaneously, can be multiple back and forth between the imperforate plate sound absorption structure of both sides
Reflection, eliminates the noise so as to play a part of decay.
Preferably, being evenly equipped with some micropores on described microperforated panel；The diameter of described micropore is less than or equal to 1mm.
The structure of microperforated panel, is to reduce noise using the acoustic resistance characteristic high of microperforated panel, and penetration hole diameter is smaller, and acoustic resistance is about big, drop
Effect of making an uproar is better.It is therefore preferable that the diameter of micropore is less than or equal to 0.5mm.
Preferably, the punching rate of micropore is equal on multilayer microperforated panel.The punching rate of micropore sets on every layer of microperforated panel
It is set to equal, such structure fabrication is convenient, and low cost, acoustic resistance characteristic high is notable.
As another preferred, the punching rate of micropore on multilayer microperforated panel：From the microperforated panel near imperforate plate side
Successively decrease successively setting to the microperforated panel near air inlet side.The punching rate of micropore can also be from imperforate plate on microperforated panel
Side is successively decreased successively, and such structure is more beneficial for sound wave and resonance is produced in the cavity of noise resonating cativty, increased noise reduction
Frequency range and sound absorption effect.
Preferably, the orifice plate thickness of described microperforated panel is less than or equal to 1mm.Thickness of slab and penetration hole diameter are smaller, acoustic resistance
About big, noise reduction is better, and preferably the orifice plate thickness of microperforated panel is less than or equal to 0.5mm.
Preferably, described imperforate plate is sound-absorbing material plate, the wedge shaped plate structure of described imperforate plate is set, institute
The big one end of the non-porous plate thickness stated is set upward, and the small one end of thickness is set towards collection cigarette component side.Imperforate plate it is above-mentioned
Structure is, in order to ensure noise reduction, to realize sound wave multiple reflections back and forth between the imperforate plate sound absorption structure of both sides, so as to rise
To the effect that decay is eliminated the noise.
Preferably, noise resonating cativty is arranged on microperforated panel each other and between microperforated panel and imperforate plate.
It is in order to noise sound wave resonates in noise that noise resonating cativty is set between microperforated panel and between microperforated panel and imperforate plate
Resonance is formed in cavity, so as to increase sound absorption frequency range, and strengthens acoustically effective.
Preferably, between described microperforated panel formed noise resonating cativty cavity less than microperforated panel with it is non-porous
The noise resonating cativty formed between plate, and noise resonating cativty successively decreases setting successively by imperforate plate side.Noise resonance is empty
The said structure in chamber causes that noise is gradually reduced, when cigarette machine works, the effective absorption of noise sound wave of microperforated panel group energy,
And there is sound absorption frequency range very wide, eliminated the noise so as to play a part of decay.
The beneficial effects of the invention are as follows：The perforated microstructure low noise lampblack absorber, multilayer microperforated panel noise reduction can widen suction
Audio frequency range, effectively reduces noise；Perforated microstructure does not influence on the air performance of ducting system, it is ensured that the Wind Volume of cigarette machine
Blast high, while effectively reducing noise.Simple structure, corrosion-resistant, resistance to greasy dirt, long lifespan.
Brief description of the drawings
Fig. 1 is a kind of structural representation of perforated microstructure low noise lampblack absorber of the present invention；
Fig. 2 is a kind of decomposition texture schematic diagram of perforated microstructure low noise lampblack absorber of the present invention；
Fig. 3 is a kind of structural representation of integrated form micropunch acoustic absorptive member in the present invention；
Fig. 4 is a kind of front view of integrated form micropunch acoustic absorptive member in the present invention；
Fig. 5 is the enlarged drawing at I in Fig. 3；
Fig. 6 is a kind of broken section enlarged drawing of integrated form micropunch acoustic absorptive member in Fig. 3；
Fig. 7 is another structural representation of integrated form micropunch acoustic absorptive member in the present invention；
Fig. 8 is a kind of broken section enlarged drawing of integrated form micropunch acoustic absorptive member in Fig. 7
In figure：1st, exhaust fume collecting hood component, 2, filter screen guard, 3, casing assembly, 4, host panel, 5, check-valves, 6, ducting assembly, 7,
Air inlet, 8, air outlet, 9, integrated form micropunch acoustic absorptive member, 10, noise resonating cativty, 11, microperforated panel, 12, imperforate plate,
13rd, micropore.
Specific embodiment
Technical scheme is described in further detail below by specific embodiment and with reference to accompanying drawing.
Embodiment 1：
In the embodiment shown in Fig. 1, Fig. 2, a kind of perforated microstructure low noise lampblack absorber, including：
One exhaust fume collecting hood component 1；Filter screen guard 2 is provided with exhaust fume collecting hood component 1；
One casing assembly 3；Casing assembly 3 is arranged on exhaust fume collecting hood component 1；Host panel 4 is provided with outside casing assembly 3；Outward
The top of shell component 3 is provided with a check-valves 5；Casing assembly 3 includes housing main body, shell back plate, sheath top plate.Casing assembly 3
Both sides be also equipped with sound absorption structure, to increase the multiple reflections back and forth of partial noise, so as to play a part of decay eliminate the noise.
One ducting assembly 6；Ducting assembly 6 is arranged on inside casing assembly 3；Two air inlets 7 are provided with ducting assembly 6
With an air outlet 8, the axis horizontal setting where two air inlet 7, the axis where air outlet 8 is where air inlet 7
Axis set；
One group of integrated form micropunch acoustic absorptive member 9；Integrated form micropunch acoustic absorptive member 9 is just arranged in series in two and enters to air inlet 7
The both sides in air port 7；Integrated form micropunch acoustic absorptive member 9 is internally provided with noise resonating cativty 10.
Integrated form micropunch acoustic absorptive member 9 includes at least two layers of porous plates 11 and one layer of imperforate plate 12；In the present embodiment
It is provided with three layers of microperforated panel 11 and one layer of imperforate plate 12（See Fig. 3）.Imperforate plate 12 is set towards the side of casing assembly 3, micro- to wear
Orifice plate 11 is set towards the side of air inlet 7.
Some micropores 13 are evenly equipped with microperforated panel 11（See Fig. 4）；The diameter of micropore 13 is less than or equal to 1mm.Three layers micro- to wear
The punching rate of micropore 13 is equal on orifice plate 11.The orifice plate thickness of microperforated panel 11 is less than or equal to 1mm.Micropore 13 in the present embodiment
Diameter is less than 0.5mm, takes 0.3mm, and the orifice plate thickness of microperforated panel 11 is less than or equal to 0.5mm, takes 0.3mm.
Imperforate plate 12 be sound-absorbing material plate, the wedge shaped plate structure of imperforate plate 12 set, the thickness of imperforate plate 12 it is big one
End is set upward, and the small one end of thickness is set towards the side of collection cigarette component 1.
Noise resonating cativty 10 be arranged on three layers of microperforated panel 11 each other and microperforated panel 11 and imperforate plate 12 it
Between.The cavity of the noise resonating cativty 10 that three layers of microperforated panel 11 is formed each other less than microperforated panel 11 and imperforate plate 12 it
Between the noise resonating cativty 10 that is formed, and noise resonating cativty 10 successively decreases setting successively by the side of imperforate plate 12（See Fig. 6）,
That is, the noise resonating cativty 10 formed between microperforated panel 11 and imperforate plate 12 is maximum, between two middle microperforated panels 11
Noise resonating cativty 10 is placed in the middle, and the noise resonating cativty 10 between outermost layer microperforated panel 11 and middle microperforated panel 11 is minimum.
Embodiment 2：
In the embodiment shown in fig. 7, a kind of perforated microstructure low noise lampblack absorber, including：
One exhaust fume collecting hood component 1；Filter screen guard 2 is provided with exhaust fume collecting hood component 1；
One casing assembly 3；Casing assembly 3 is arranged on exhaust fume collecting hood component 1；Host panel 4 is provided with outside casing assembly 3；Outward
The top of shell component 3 is provided with a check-valves 5；Casing assembly 3 includes housing main body, shell back plate, sheath top plate.Casing assembly 3
Both sides be also equipped with sound absorption structure, to increase the multiple reflections back and forth of partial noise, so as to play a part of decay eliminate the noise.
One ducting assembly 6；Ducting assembly 6 is arranged on inside casing assembly 3；Two air inlets 7 are provided with ducting assembly 6
With an air outlet 8, the axis horizontal setting where two air inlet 7, the axis where air outlet 8 is where air inlet 7
Axis set；
One group of integrated form micropunch acoustic absorptive member 9；Integrated form micropunch acoustic absorptive member 9 is just arranged in series in two and enters to air inlet 7
The both sides in air port 7；Integrated form micropunch acoustic absorptive member 9 is internally provided with noise resonating cativty 10.
Integrated form micropunch acoustic absorptive member 9 includes at least two layers of porous plates 11 and one layer of imperforate plate 12；Microperforated panel 11
Can be variously-shaped, microperforated panel 11 can be engaged with the shape of air inlet 7, and microperforated panel 11 is in air inlet
Portion's protrusion is set, and integrated form micropunch acoustic absorptive member 10 is provided with four layers of microperforated panel 11 and one layer of imperforate plate in the present embodiment
12.Imperforate plate 12 is set towards the side of casing assembly 3, and microperforated panel 11 is set towards the side of air inlet 7.
Some micropores 13 are evenly equipped with microperforated panel 11；The diameter of micropore 13 is less than or equal to 1mm.The orifice plate of microperforated panel 11
Thickness is less than or equal to 1mm.The diameter of micropore 13 is less than 0.3mm in the present embodiment, takes 0.2mm, the orifice plate thickness of microperforated panel 11
Less than or equal to 0.3mm, 0.2mm is taken.The punching rate of micropore 13 on four layers of microperforated panel 11：From micro- the wearing near the side of imperforate plate 12
Orifice plate 11 successively decreases setting successively to the microperforated panel 11 near the side of air inlet 7（See Fig. 8）.
Imperforate plate 12 be sound-absorbing material plate, the wedge shaped plate structure of imperforate plate 12 set, the thickness of imperforate plate 12 it is big one
End is set upward, and the small one end of thickness is set towards the side of collection cigarette component 1.
Noise resonating cativty 10 is arranged on microperforated panel 11 each other and between microperforated panel 11 and imperforate plate 12.
The cavity of the noise resonating cativty 10 formed between microperforated panel 11 is less than between microperforated panel 11 and imperforate plate 12
The noise resonating cativty 10 of formation, and noise resonating cativty 10 successively decreases setting successively by the side of imperforate plate 12.That is, microperforated panel
The noise resonating cativty 10 formed between 11 and imperforate plate 12 is maximum, between outermost layer microperforated panel 11 and middle microperforated panel 11
Noise resonating cativty 10 it is minimum.
Perforated microstructure low noise lampblack absorber shown in above-described embodiment, structure includes：Check-valves, host panel, exhaust fume collecting hood
Component, casing assembly, ducting assembly, filter screen guard, integrated form micropunch acoustic absorptive member.Ducting assembly is installed in casing assembly,
It is connected by screw；Exhaust fume collecting hood component and filter screen guard are installed in casing assembly bottom；Casing assembly both sides are just to ducting assembly
Air inlet installs one group of integrated form micropunch acoustic absorptive member, and integrated form micropunch acoustic absorptive member is set in cascaded structure.
Its general principle is to reduce noise using the acoustic resistance characteristic high of microperforated panel, it is desirable to which thickness of slab and penetration hole diameter are got over
Small, acoustic resistance is about big, and noise reduction is better.The series connection of integrated form micropunch acoustic absorptive member, leaves a spacing after microperforated panel simultaneously
From space, so as to form noise resonating cativty 10.Noise sound wave forms resonance in noise resonating cativty 10, so as to increase
Sound absorption frequency range, and strengthen acoustically effective.
Microperforated panel 11 in integrated form micropunch acoustic absorptive member 9 is provided with multilayer, and penetration hole diameter φ and orifice plate thickness alpha are all
Less than 1mm, its structure is superimposed for multilayer microperforated panel with one layer of imperforate plate, and certain distance is stayed between plate, forms noise resonating cativty
10.When cigarette machine works, the effective absorption of noise sound wave of the energy of integrated form micropunch acoustic absorptive member 9, and have sound absorption very wide frequently
Section.And part fails the noise sound wave that fully absorbs, can between the sound absorption structure of both sides multiple reflections back and forth, declined so as to play
Subtract the effect of noise elimination.
The perforated microstructure low noise range hood structure is simple, and oil resistant is corrosion-resistant, long lifespan.And perforated microstructure is to air channel system
The air performance of system does not influence, it is ensured that the Wind Volume blast high of cigarette machine, while reducing noise well.By using many
The integrated form micropunch acoustic absorptive member of layer microperforated panel and noise reducing imperforate plate structure composition, on the propagation path of noise
Noise is reduced, while keeping the air performance of lampblack absorber original Wind Volume blast high.
Claims (9)
1. a kind of perforated microstructure low noise lampblack absorber, it is characterised in that including：
One exhaust fume collecting hood component；Filter screen guard is provided with described exhaust fume collecting hood component；
One casing assembly；Described casing assembly is arranged on exhaust fume collecting hood component；Main frame is provided with outside described casing assembly
Panel；A check-valves is provided with the top of described casing assembly；
One ducting assembly；Described ducting assembly is arranged on inside casing assembly；Two are provided with described ducting assembly to enter
Air port and an air outlet, the axis horizontal where two described air inlets are set, and the axis where described air outlet is vertical
Set in the axis where air inlet；
One group of integrated form micropunch acoustic absorptive member；Described integrated form micropunch acoustic absorptive member is just arranged in series in two to air inlet
The both sides of air inlet；Described integrated form micropunch acoustic absorptive member is internally provided with noise resonating cativty.
2. a kind of perforated microstructure low noise lampblack absorber according to claim 1, it is characterised in that：Described integrated declining is worn
Hole acoustic absorptive member includes at least two layers of porous plates and one layer of imperforate plate；Described imperforate plate is set towards casing assembly side,
Microperforated panel is set towards air inlet side.
3. a kind of perforated microstructure low noise lampblack absorber according to claim 2, it is characterised in that：On described microperforated panel
It is evenly equipped with some micropores；The diameter of described micropore is less than or equal to 1mm.
4. a kind of perforated microstructure low noise lampblack absorber according to claim 2, it is characterised in that：It is micro- on multilayer microperforated panel
The punching rate in hole is equal.
5. a kind of perforated microstructure low noise lampblack absorber according to claim 2, it is characterised in that：It is micro- on multilayer microperforated panel
The punching rate in hole：Successively decrease successively setting to the microperforated panel near air inlet side from the microperforated panel near imperforate plate side.
6. a kind of perforated microstructure low noise lampblack absorber according to claim 2, it is characterised in that：Described microperforated panel
Orifice plate thickness is less than or equal to 1mm.
7. a kind of perforated microstructure low noise lampblack absorber according to claim 2, it is characterised in that：Described imperforate plate is suction
Sound material plate, the wedge shaped plate structure of described imperforate plate is set, and the big one end of described non-porous plate thickness is set upward, thick
The small one end of degree is set towards collection cigarette component side.
8. a kind of perforated microstructure low noise lampblack absorber according to Claims 2 or 3 or 4 or 5 or 6 or 7, it is characterised in that：
Noise resonating cativty is arranged on microperforated panel each other and between microperforated panel and imperforate plate.
9. a kind of perforated microstructure low noise lampblack absorber according to claim 8, it is characterised in that：Described microperforated panel it
Between the cavity of noise resonating cativty that is formed less than the noise resonating cativty formed between microperforated panel and imperforate plate, and noise
Resonating cativty is successively decreased setting successively by imperforate plate side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611159378.1A CN106765384A (en) | 2016-12-15 | 2016-12-15 | A kind of perforated microstructure low noise lampblack absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611159378.1A CN106765384A (en) | 2016-12-15 | 2016-12-15 | A kind of perforated microstructure low noise lampblack absorber |
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| CN106765384A true CN106765384A (en) | 2017-05-31 |
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ID=58889076
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611159378.1A Pending CN106765384A (en) | 2016-12-15 | 2016-12-15 | A kind of perforated microstructure low noise lampblack absorber |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731068A (en) * | 2018-07-14 | 2018-11-02 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator with noise filtering device |
| CN108916942A (en) * | 2018-07-14 | 2018-11-30 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator with autonomous channel formula water conservancy diversion noise filtering device |
| CN109373395A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of casing of kitchen ventilator and kitchen ventilator with noise interference device |
| CN109458736A (en) * | 2018-12-24 | 2019-03-12 | 广东美的白色家电技术创新中心有限公司 | Gas water-heater housing and gas heater |
| CN109595632A (en) * | 2017-09-30 | 2019-04-09 | 宁波方太厨具有限公司 | A kind of near-suction type oil smoke suction machine |
| CN111720362A (en) * | 2020-06-01 | 2020-09-29 | 广东美的厨房电器制造有限公司 | Fan assembly and heating furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109595632A (en) * | 2017-09-30 | 2019-04-09 | 宁波方太厨具有限公司 | A kind of near-suction type oil smoke suction machine |
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| CN109458736A (en) * | 2018-12-24 | 2019-03-12 | 广东美的白色家电技术创新中心有限公司 | Gas water-heater housing and gas heater |
| CN111720362A (en) * | 2020-06-01 | 2020-09-29 | 广东美的厨房电器制造有限公司 | Fan assembly and heating furnace |
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Application publication date: 20170531 |
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| RJ01 | Rejection of invention patent application after publication |