CN102409875A - Ecological swimming pool - Google Patents

Ecological swimming pool Download PDF

Info

Publication number
CN102409875A
CN102409875A CN2011103784229A CN201110378422A CN102409875A CN 102409875 A CN102409875 A CN 102409875A CN 2011103784229 A CN2011103784229 A CN 2011103784229A CN 201110378422 A CN201110378422 A CN 201110378422A CN 102409875 A CN102409875 A CN 102409875A
Authority
CN
China
Prior art keywords
filter bed
water
swimming pool
ecological
treatment system
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
Application number
CN2011103784229A
Other languages
Chinese (zh)
Inventor
杜建强
张瑛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUZHOU DEHUA ECOLOGICAL ENVIRONMENT TECHNOLOGY Co Ltd
Original Assignee
SUZHOU DEHUA ECOLOGICAL ENVIRONMENT TECHNOLOGY Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SUZHOU DEHUA ECOLOGICAL ENVIRONMENT TECHNOLOGY Co Ltd filed Critical SUZHOU DEHUA ECOLOGICAL ENVIRONMENT TECHNOLOGY Co Ltd
Priority to CN2011103784229A priority Critical patent/CN102409875A/en
Publication of CN102409875A publication Critical patent/CN102409875A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37Wastewater or sewage treatment systems using renewable energies using solar energy

Landscapes

  • Biological Treatment Of Waste Water (AREA)

Abstract

The invention provides an ecological swimming pool, wherein a water outlet of the swimming pool is connected to a water inlet of a balanced pool through a pipeline; a hair filter is arranged at the water inlet of the balanced pool; a water outlet of the balanced pool is connected to a water inlet of a constructed wetland ecological treatment system through a circulating water pump; a water outlet of the constructed wetland ecological treatment system is connected to the swimming pool through a heating device; a tap water supplying pipeline is connected on the balanced pool; a discharge opening is arranged at the swimming pool; the constructed wetland ecological treatment system is a vertical current ecological filter bed with a square structure; an anti-seepage film is paved on the bottom of the filter bed; a water collecting pipe is paved on the anti-seepage film; vent pipes are connected with two ends of the water collecting pipe; substrates are filled in the filter bed; plants are planted on the surface of the filter bed; a water distribution main pipe is longitudinally distributed on the filter bed; and a water distribution branch pipe communicated with the water distribution main pipe is transversely arranged and covers the surface of the filter bed. According the invention, the water purification of the swimming pool is completed by utilizing the constructed wetland and no chemical agent is added to ensure that the hurt of a traditional disinfection system to human body is avoided.

Description

Ecological swimming pool
Technical field
The present invention relates to a kind of swimming pool, relate in particular to a kind of ecological swimming pool with aquatic attitude treatment system.
Background technology
Along with The development in society and economy; People's living standard improves constantly; Also more and more pay attention to participating in each item Leisure Sport campaigns such as body-building, swimming is a present popular leisure project of moving by water body, and its environment-water quality is had strict requirement.If the water quality in swimming place is bad, does not only reach the purpose of exercise, and can become the healthy place of harm swimmer that spreads disease.So the environment of swimming pool and swimming pool water quality also obtain the many concerns of People more and more.
At present, swimming-pool water handle to divide physical process and chemical process two parts, and the filtration that physical process is a swimming-pool water through circulating water treatment device is purified Chi Shui; Chemical process adds chemical agent and it is carried out disinfection, flocculates, removes processing such as algae when being meant the pool water within circulation, the effect through physical process cleans Chi Shui and health again.These two processes carry out simultaneously guaranteeing that the water quality of Chi Shui is up to state standards.Problems such as that but the traditional circular water treating system of swimming pool exists is unfavorable to health, water resource waste and contaminated environment.
Traditional swimming pool filter plant adopts filter-press (filtration of sand cylinder) that swimming pool water is purified more, and behind the filter-press work certain hour, the sedimentation of suspension layer of filtration is thickeied gradually; Influence filter efficiency; In order to overcome this phenomenon, need carry out backwash with the tap water of cleaning, backwashing sewage water directly is discharged into sewer; Not only cause water resource waste, also environment is polluted simultaneously.Main more traditional chlorination technology or the ozone disinfecting technology etc. of adopting of swimming-pool water sterilization at present.The chlorination technology has advantages such as disinfection efficiency height, cost is low, the throwing amount is accurate, is still application swimming pool water sterilization the most widely technology so far.But should technology in disinfecting process, can produce accessory substances such as combined chlorine and haloform, certain injury can be arranged people's health, swimming pool structure, equipment and pipeline are also had certain corrosiveness, this technical operation managerial skills are had relatively high expectations simultaneously.Ozone disinfecting technology has certain danger, can cause when ozone reaches 1ppm in air symptom such as breathe to quicken, uncomfortable in chest, and equipment investment is expensive, and floor space is big.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists; A kind of ecological swimming pool is provided; Can substitute traditional filtration system and decontamination system; Avoid adding medicament and damage and potential danger, reduce workman labour hour, reduce labour intensity, save water resource pollution and waste that backwash causes to human body.
The object of the invention is realized through following technical scheme:
Ecological swimming pool; Characteristics are: comprise successively connecting and composing the swimming pool of loop, balanced pond, circulating water pump, artificial swamp ecological treatment system and heater through pipeline; The delivery port of swimming pool is connected to the water inlet in balanced pond through pipeline; The water inlet in balanced pond is equipped with hair filter, and the delivery port in balanced pond is connected to the water inlet of artificial swamp ecological treatment system through circulating water pump, and the delivery port of artificial swamp ecological treatment system is connected to swimming pool through heater; Be connected with the tap water water pipe on the balanced pond, swimming pool is provided with discharge opening; Said artificial swamp ecological treatment system is that vertical current is ecological filter bed, and said vertical current is ecological filter bed to be square structure, and the filter bed bottom is equipped with antiseepage film, is covered with header on the said antiseepage film, and said header two ends connect ventilating pipe; The inner filling substrate of said filter bed, filter bed surface serike; Filter bed vertically is distributed with water distribution and is responsible for, and is responsible for the transversely arranged covering filter bed of the water distribution branch pipe that is connected surface with water distribution.
Further, above-mentioned ecological swimming pool, said matrix is made up of ecological filler processing layer, transition zone and drainage blanket, and said ecological filler processing layer is the upper strata, and said transition zone is the intermediate layer, and said drainage blanket is a lower floor.
Further, above-mentioned ecological swimming pool, the body of wall of said filter bed are aluminium alloy structure.
Again further, above-mentioned ecological swimming pool is provided with lime compacting bed course between said filter bed bottom and the antiseepage film.
Again further, above-mentioned ecological swimming pool, said header is arranged to external radiation with the filter bed center, and header connects ventilating pipe near filter bed body of wall one end.
Substantive distinguishing features and obvious improvement that technical scheme of the present invention is outstanding are mainly reflected in:
The present invention utilizes the treatment system of artificial wet land system as swimming pool water, and this artificial wetland process is simple, mainly through the ecological filter bed realization swimming pool of vertical current purification of water quality.Swimming pool recirculated water is through balanced pond, circulating water pump, and is through water distribution system that water cloth is surperficial to filter bed, and water body is inner through filter bed from top to bottom through action of gravity, and wetland interacts with water plant and filtrate, and water body progressively is purified.The ecological filter bed technology of vertical current is a kind of high efficient technology in the artificial swamp, effectively handles all kinds of sewage in conjunction with physical filtering and biochemical reaction.Prove that according to experimental study and a large amount of engineering practices vertical current is ecological filter bed can remove materials such as TSS, nitrogen, phosphorus well, and to the removal of pathogenetic bacteria, its effect also very effectively.This treatment technology utilizes artificial swamp to accomplish the swimming pool water purification; Do not add any chemical agent; Can avoid because the injury that traditional decontamination system causes, the potential danger of avoiding the decontamination system existence, saving backwash expense and artificial running cost human body; And have good landscape effect, be very suitable for the circular treatment of natural outdoor bathing place and outdoor swimming pool water body.
Description of drawings
Below in conjunction with accompanying drawing technical scheme of the present invention is described further:
Fig. 1: the adapter principle schematic of the ecological swimming pool of the present invention;
Fig. 2: the generalized section of the artificial Wetland ecological treatment system of the present invention;
Fig. 3: the water distribution system sketch map of the artificial Wetland ecological treatment system of the present invention.
The specific embodiment
The present invention provides a kind of swimming pool aquatic attitude treatment system; Can utilize artificial wet land system to substitute traditional physical process and chemical process in the swimming-pool water processing; Can avoid owing to the injury that traditional decontamination system causes, potential danger, saving backwash expense and the artificial running cost of avoiding decontamination system to exist, and have good landscape effect human body.
As shown in Figure 1; Ecological swimming pool; Comprise the swimming pool 101, balanced pond 102, circulating water pump 103, artificial swamp ecological treatment system 104 and the heater 105 that connect and compose loop successively through pipeline, the delivery port of swimming pool 101 is connected to the water inlet in balanced pond 102 through pipeline, and the water inlet in balanced pond 102 is equipped with hair filter; Remove fiber, hair and bigger solid sundries in the pond; Guaranteeing carrying out smoothly of next step purification and circulation, the delivery port in balanced pond 102 is connected to the water inlet of artificial swamp ecological treatment system 104 through circulating water pump 103, and the delivery port of artificial swamp ecological treatment system 104 is connected to swimming pool through heater 105; Be connected with tap water water pipe 107 on the balanced pond 102, swimming pool establishes 101 has discharge opening 106.Swimming pool recirculated water flows to balanced pond 102 from swimming pool 101; Tap water filling pipe 107 also can carry out moisturizing to balanced pond 102; Circulating water pump 103 is delivered to artificial swamp ecological treatment system 104 with the swimming pool recirculated water in the balanced pond, is purified by 104 pairs of swimming pool water of artificial swamp ecological treatment system, simultaneously; The filter bed that is covered by plant in the artificial swamp ecological treatment system 104; Through the surface heat conduction water body is heated, perhaps temperature does not reach when requiring and passes through other heat pre-treatment such as water source heater or solar energy through heater 105 again, and last recirculated water is back to swimming pool 101.
Artificial swamp ecological treatment system 104 is that vertical current is ecological filter bed; As shown in Figure 2; Vertical current is ecological filter bed to be square structure, and the filter bed area is confirmed by the ecological filter bed area of swimming pool area ︰ vertical current=1 ︰ 1 according to the area of swimming pool; Filter bed quantity can be one, also can be several filter bed combinations; The body of wall 4 of filter bed is for ease of the aluminium alloy structure of assembling, and is peripheral by the environment-friendly materials veneer, body of wall 4 high 1.3m; Thick 0.24m, the filter bed bottom is laid the thick lime compacting of 10cm bed course successively, lays 1mm PE composite earthwork cloth antiseepage film 5 on the lime compacting bed course and carries out the antiseepage processing; Be covered with header 6 on the antiseepage film 5, header 6 is arranged to external radiation with the filter bed center, and water outlet compiles the back and discharges from outlet pipe 15; Header connects DN110 PVC ventilating pipe 9 near filter bed body of wall one end; The top of ventilating pipe 9 connects the perforate vent cap, makes to cut the hole through the header annular in the sensible wetland of oxygen bottom; To the filter bed diffusion inside, the gas of regional area anaerobic reaction generation simultaneously can be to the timely dissipation in the external world; The inner filling substrate of filter bed, matrix is made up of the different levels filtrate, comprises the ecological filler processing layer 1 of thickness 50cm, the diameter 8-16mm cobblestone transition zone 2 of thickness 10cm and the diameter 16-32mm coarse gravel drainage blanket 3 of thickness 20cm; Ecological filler processing layer 1 is the upper strata; Transition zone 2 is the intermediate layer, and drainage blanket 3 is a lower floor, and wherein the processing layer filtrate satisfies the requirement of hydraulic parameters and graduation curve; Can guarantee good hydraulics, and good growing environment is provided for plant and microorganism; The plantation of filter bed surface has the strong and good plant 7 of landscape effect of dirt-removing power, and plant is a reed, and planting density is 15 strains/m 2, have certain landscape effect; The water distribution that vertically is provided with at filter bed is responsible for 8, is responsible for the water distribution branch pipe 10 that is connected with water distribution and laterally covers the filter bed surface.Swimming pool recirculated water compiles the back discharge through header effectively remove impurity such as nitrogen, phosphorus, suspension, flocculate, pathogenetic bacteria through plant, microorganism and matrix after.
As shown in Figure 3, the ecological filter bed water distribution system of vertical current, water distribution are responsible for 8 and are connected with DN110*75 concentric reducer 14 with DN160*110 reduced tee 13 with water distribution branch pipe 10.DN160 PE pipe is responsible for as water distribution, is responsible for two ends with DN160 flange 11 and blank flange 12 sealings; The semicircle PE pipe of DN75 is as arm, and every separated 1m evenly punches on the arm, and the aperture is 8mm, guarantees that water distribution is even.
The used ecological filler of artificial swamp is confirmed through two step experimental techniques of special (Grant) filtrate infiltration test of Glan and sieve test; The filtrate of specific graduation curve is satisfied in selection; And add the efficient dephosphorization filtrate and carry out the filtrate combination; Guarantee artificial swamp operation steady in a long-term, to Impurity removal effect stability in the water body.This facility is applicable to the processing of natural outdoor bathing place, outdoor pool etc., has that treatment effeciency height, landscape effect are good, resources conservation, flexible operation, characteristics such as applied widely, has a extensive future, and is worth extensive popularization in the field of business.
The present invention utilizes the treatment system of artificial wet land system as swimming pool water, and this artificial wetland process is simple, mainly through the ecological filter bed realization swimming pool of vertical current purification of water quality.Swimming pool recirculated water is through balanced pond, circulating water pump, and is through water distribution system that water cloth is surperficial to filter bed, and water body is inner through filter bed from top to bottom through action of gravity, and wetland interacts with water plant and filtrate, and water body progressively is purified.The ecological filter bed technology of vertical current is a kind of high efficient technology in the artificial swamp, effectively handles all kinds of sewage in conjunction with physical filtering and biochemical reaction.Prove that according to experimental study and a large amount of engineering practices vertical current is ecological filter bed can remove materials such as TSS, nitrogen, phosphorus well, and to the removal of pathogenetic bacteria, its effect also very effectively.This treatment technology utilizes artificial swamp to accomplish the swimming pool water purification; Do not add any chemical agent; Can avoid because the injury that traditional decontamination system causes, the potential danger of avoiding the decontamination system existence, saving backwash expense and artificial running cost human body; And have good landscape effect, be very suitable for the circular treatment of natural outdoor bathing place and outdoor swimming pool water body.
Compared with prior art, be a kind of swimming pool water treatment mode of full ecological, artificial swamp is a compound ecosystem, is the simulation to natural wetland, mainly the acting in conjunction by matrix, microorganism, plant reaches the function that purifies water.Do not need filter plant, sterilizing equipment decontaminating apparatus, need not add chemical agent, swimming pool water is through circulating water pump; By water distribution pipe equably jet flow to the ecological filter bed surface of vertical current; Ooze under the sewage gravity, after the biological treatment of filter bed matrix and root system of plant, collect in the bottom by header.This processing mode can substitute traditional filter plant and sterilizing equipment decontaminating apparatus, and does not add any chemical agent, can not work the mischief to health, and operation maintenance is simple, long service life, do not need to wash repeatedly water resource waste and the water pollution that causes.
What need understand is: the above only is a preferred implementation of the present invention; For those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims (5)

1. ecological swimming pool; It is characterized in that: comprise successively connecting and composing the swimming pool of loop, balanced pond, circulating water pump, artificial swamp ecological treatment system and heater through pipeline; The delivery port of swimming pool is connected to the water inlet in balanced pond through pipeline; The water inlet in balanced pond is equipped with hair filter, and the delivery port in balanced pond is connected to the water inlet of artificial swamp ecological treatment system through circulating water pump, and the delivery port of artificial swamp ecological treatment system is connected to swimming pool through heater; Be connected with the tap water water pipe on the balanced pond, swimming pool is provided with discharge opening; Said artificial swamp ecological treatment system is that vertical current is ecological filter bed, and said vertical current is ecological filter bed to be square structure, and the filter bed bottom is equipped with antiseepage film, is covered with header on the said antiseepage film, and said header two ends connect ventilating pipe; The inner filling substrate of said filter bed, filter bed surface serike; Filter bed vertically is distributed with water distribution and is responsible for, and is responsible for the transversely arranged covering filter bed of the water distribution branch pipe that is connected surface with water distribution.
2. ecological swimming pool according to claim 1 is characterized in that: said matrix is made up of ecological filler processing layer, transition zone and drainage blanket, and said ecological filler processing layer is the upper strata, and said transition zone is the intermediate layer, and said drainage blanket is a lower floor.
3. ecological swimming pool according to claim 1 is characterized in that: the body of wall of said filter bed is an aluminium alloy structure.
4. ecological swimming pool according to claim 1 is characterized in that: be provided with lime compacting bed course between said filter bed bottom and the antiseepage film.
5. ecological swimming pool according to claim 1 is characterized in that: said header is arranged to external radiation with the filter bed center, and header connects ventilating pipe near filter bed body of wall one end.
CN2011103784229A 2011-11-24 2011-11-24 Ecological swimming pool Pending CN102409875A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011103784229A CN102409875A (en) 2011-11-24 2011-11-24 Ecological swimming pool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011103784229A CN102409875A (en) 2011-11-24 2011-11-24 Ecological swimming pool

Publications (1)

Publication Number Publication Date
CN102409875A true CN102409875A (en) 2012-04-11

Family

ID=45912180

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011103784229A Pending CN102409875A (en) 2011-11-24 2011-11-24 Ecological swimming pool

Country Status (1)

Country Link
CN (1) CN102409875A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104016487A (en) * 2014-06-04 2014-09-03 厦门国寿种猪开发有限公司 Artificial wetland
CN107882369A (en) * 2017-11-27 2018-04-06 花泽燕 A kind of solar heated swimming pool
CN112851056A (en) * 2021-04-09 2021-05-28 北控水务(中国)投资有限公司 Self-purification ecological swimming pool system
CN113338679A (en) * 2021-05-26 2021-09-03 天下光捕(武汉)生态科技有限公司 Rotary swimming pool floating on water surface

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20012330U1 (en) * 2000-07-17 2000-11-02 Stummer, Hans F., 86825 Bad Wörishofen Swimming and bathing pool has vegetation at the edges as a biological regeneration zone and waves are generated in the water flow to move floating particles to the edges
WO2007068013A1 (en) * 2005-12-14 2007-06-21 Minnova Mineralien Handelsges.M.B.H. Pool assembly
EP1967672A1 (en) * 2007-03-05 2008-09-10 Gilbert Dreyer Pool, in particular for swimming
CN101462814A (en) * 2009-01-16 2009-06-24 中国科学院水生生物研究所 Bio-ecological combination method for sewage purification

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20012330U1 (en) * 2000-07-17 2000-11-02 Stummer, Hans F., 86825 Bad Wörishofen Swimming and bathing pool has vegetation at the edges as a biological regeneration zone and waves are generated in the water flow to move floating particles to the edges
WO2007068013A1 (en) * 2005-12-14 2007-06-21 Minnova Mineralien Handelsges.M.B.H. Pool assembly
EP1967672A1 (en) * 2007-03-05 2008-09-10 Gilbert Dreyer Pool, in particular for swimming
CN101462814A (en) * 2009-01-16 2009-06-24 中国科学院水生生物研究所 Bio-ecological combination method for sewage purification

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杜建强等: "湖泊岸区生活污水生态湿地处理系统研究", 《环境科技》, vol. 23, no. 5, 31 October 2010 (2010-10-31) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104016487A (en) * 2014-06-04 2014-09-03 厦门国寿种猪开发有限公司 Artificial wetland
CN107882369A (en) * 2017-11-27 2018-04-06 花泽燕 A kind of solar heated swimming pool
CN112851056A (en) * 2021-04-09 2021-05-28 北控水务(中国)投资有限公司 Self-purification ecological swimming pool system
CN112851056B (en) * 2021-04-09 2023-05-09 北控水务(中国)投资有限公司 Self-purification ecological swimming pool system
CN113338679A (en) * 2021-05-26 2021-09-03 天下光捕(武汉)生态科技有限公司 Rotary swimming pool floating on water surface

Similar Documents

Publication Publication Date Title
KR102034822B1 (en) Super-large scale photon capture bioreactor for water purification and operation method therefor
CN103523998B (en) A kind of purifying method controlling extraneous contamination source and the black smelly river course of restoration of the ecosystem
CN104529086B (en) Sewage-treatment plant
CN101575156B (en) Artificial wetland system for enhancing nitrogen and phosphorus removal
CN205241356U (en) Ecological chinampa water treatment facilities of solar energy combined type
CN101781061B (en) Plant configuration method applied to vertical flow-horizontal subsurface flow composite artificial wetland
CN101215069A (en) Industrialization ecological treatment circulation utilization system for fish culture waste water
CN208791414U (en) A kind of small rural solar-powered thermal circulating sewage processing equipment
CN103359893A (en) A sewage treatment and reclaimed-water reuse coupled system for landscape energy-efficient residential areas
CN204625422U (en) A kind of Sewage treatment systems
CN105540995A (en) Ecological utilization method for purifying rural household sewage and sewage generated by aquatic bird breeding
CN103848535B (en) Multimedium renewable biological filtering method and device
CN202046969U (en) Wastewater treatment system combining biological contact oxidation pond and constructed wetland
CN104692590A (en) Sewage treatment system
CN102409875A (en) Ecological swimming pool
CN208814729U (en) A kind of sewage treatment plant tail water advanced treatment system
CN115191395B (en) Freshwater pond circulating water culture device and system
CN201785809U (en) Water supply and drainage circulating device for communities
CN207738513U (en) Small towns applicability integrated sewage treating apparatus
CN101704614B (en) Integrated waste water treating tank
CN202391172U (en) Ecological swimming pool
CN208327714U (en) Rural domestic sewage treatment integrated apparatus
CN107555602A (en) A kind of ecological restoration device of micro-nano bubble oxygenation activation
CN103553284B (en) Semi-buried landscape type new countryside living sewage treatment system
CN204342622U (en) Full automatic control microkinetic distributing ecology domestic sewage processing system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20120411

RJ01 Rejection of invention patent application after publication