[go: up one dir, main page]

CN104689719A - Air-blast-available external pressure type hollow fiber membrane module with one fixed end - Google Patents

Air-blast-available external pressure type hollow fiber membrane module with one fixed end Download PDF

Info

Publication number
CN104689719A
CN104689719A CN201310652886.3A CN201310652886A CN104689719A CN 104689719 A CN104689719 A CN 104689719A CN 201310652886 A CN201310652886 A CN 201310652886A CN 104689719 A CN104689719 A CN 104689719A
Authority
CN
China
Prior art keywords
hollow fiber
shell
delivery port
water delivery
fiber membrane
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
CN201310652886.3A
Other languages
Chinese (zh)
Inventor
李尚志
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.)
BEIJING DAKING EASTERN TECHNOLOGY Co Ltd
Original Assignee
BEIJING DAKING EASTERN 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 BEIJING DAKING EASTERN TECHNOLOGY Co Ltd filed Critical BEIJING DAKING EASTERN TECHNOLOGY Co Ltd
Priority to CN201310652886.3A priority Critical patent/CN104689719A/en
Publication of CN104689719A publication Critical patent/CN104689719A/en
Pending legal-status Critical Current

Links

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
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124Water desalination
    • Y02A20/131Reverse-osmosis

Landscapes

  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention relates to an air-blast-available external pressure type hollow fiber membrane module with one fixed end. The hollow fiber membrane module comprises a shell and hollow fiber membrane filaments, wherein an air inlet is formed in the center of one end of the shell, and at the same end, a water inlet is arranged at a certain angle with the air inlet; a concentrated water outlet is formed in the center of the other end of the shell, and at the same end, a produced water outlet is arranged at a certain angle with the concentrated water outlet; the hollow fiber membrane filaments are arranged in an inner cavity of the shell and extend from one end to the other end of the shell; one end, close to the water inlet and the air inlet, of each hollow fiber membrane filament is closed; the other end, close to the produced water outlet and the concentrated water outlet, of each hollow fiber membrane filament is fixed in the inner cavity of the shell; the inner cavity of the shell is divided into a produced water collection chamber and a water separation chamber; the produced water collection chamber is positioned at one end of the shell where the produced water outlet is formed; the produced water outlet is communicated with the produced water collection chamber; the concentrated water outlet is communicated with the water separation chamber through a central pipe arranged in the center of the inner cavity of the shell; the hollow fiber membrane filaments are positioned in the water separation chamber; the end, fixed in the inner cavity of the shell, of each filament is communicated with the produced water collection chamber.

Description

The external pressure type hollow fiber membrane component of the annoying punching that one end is fixed
Technical field
The present invention relates to a kind of hollow fiber film assembly of water treatment, particularly relate to the external pressure type hollow fiber membrane component of the annoying punching that a kind of one end is fixed.
Background technology
At present, many industries all adopt and use the water treatment facilities of doughnut to carry out the process of water purification and various liquid.Such as: the advanced treating of field sewage and the process of reuse and production technology water such as municipal administration, electric power, iron and steel, petrochemical industry, weaving, food, the purified treatment of municipal water supply, the pretreatment of desalinization and counter-infiltration system, and the purification in the field such as food and bio-pharmaceuticals, concentrated and be separated.
Along with the application of hollow-fibre membrane, large-scale water treatment is had more reliable approach.But the inner pressed hollow fiber film assembly generally used at present and external pressure type hollow fiber membrane component, all there is the irrational problem of structural design, due to structural unreasonable, cause water-flow equation in assembly uneven, cause assembly backwash and air purge thorough thus, film silk pollutes the problems such as excessive velocities and film silk easily rupture and occurs.
In view of this, the present inventor is based on being engaged in the practical experience and professional knowledge that this type of product design manufacture enriches for many years, and coordinate the utilization of scientific principle, actively in addition research and innovation, through constantly research, design, and through repeatedly having a fling at sample and after improving, finally creating the present invention had practical value.
Summary of the invention
The object of the invention is to, overcome the defect that prior art exists, and the external pressure type hollow fiber membrane component of the annoying punching providing one end of a kind of new structure to fix, technical problem to be solved makes it be closed by single hollow fiber film thread one end, and only the other end is fixed, and can be conducive to being uniformly distributed of current, make backwash and air purge thorough, reduce the pollution speed of film silk, improve the service life of film silk, be very suitable for practicality.
The object of the invention to solve the technical problems adopts following technical scheme to realize.The external pressure type hollow fiber membrane component of the annoying punching that a kind of one end proposed according to the present invention is fixed, it comprises: shell and hollow fiber film thread; One end of described shell is provided with water inlet and air inlet, and the other end is provided with and produces water delivery port and dense water delivery port; Wherein said air inlet is arranged at the center of described shell one end, and described water inlet is arranged at an angle at this end and described air inlet; Described dense water delivery port is arranged at the center of the described shell other end, and described product water delivery port is arranged at an angle at this end and described dense water delivery port; Described hollow fiber film thread is arranged at the inner chamber of described shell, and extends to the other end by one end of described shell; Wherein said hollow fiber film thread is closed near one end of described water inlet and described air inlet, and the other end of close described product water delivery port and described dense water delivery port is fixed on the inner chamber of described shell; The inner chamber of described shell is separated into and produces water collecting chamber and water separation chamber; Wherein said product water collecting chamber is positioned at one end that described shell is provided with described product water delivery port and described dense water delivery port, and described product water delivery port is communicated with described product water collecting chamber; Also be provided with central tube at the center of the inner chamber of described shell, described dense water delivery port is connected with one end of described central tube, and is communicated with described water separation chamber through described product water collecting chamber by described central tube; Described hollow fiber film thread is positioned at described water and is separated indoor, and its one end being fixed on the inner chamber of described shell is communicated with described product water collecting chamber.
Object of the present invention and solve its technical problem and can also be further achieved by the following technical measures.
The external pressure type hollow fiber membrane component of the annoying punching that aforesaid one end is fixed, wherein said shell comprises: cylindrical shell, upper cover and low head, and described upper cover and described low head are arranged at the two ends of described cylindrical shell respectively; Wherein said water inlet and described air inlet are arranged on described low head, and described product water delivery port and described dense water delivery port are arranged on described upper cover, and described hollow fiber film thread is arranged in described cylindrical shell.
The external pressure type hollow fiber membrane component of the annoying punching that aforesaid one end is fixed, wherein said upper cover and described low head are respectively equipped with cavity; One end of described cylindrical shell is openend, by described openend, the inner chamber of described cylindrical shell is communicated with the cavity of described low head and forms described water separation chamber; The other end of described cylindrical shell is blind end, and the cavity being closed described upper cover by described blind end forms described product water collecting chamber; The blind end of described cylindrical shell is fixed in one end that wherein said hollow fiber film thread is communicated with described product water collecting chamber, and the other end of described central tube is fixed on the blind end of described cylindrical shell.
The external pressure type hollow fiber membrane component of the annoying punching that aforesaid one end is fixed, the blind end of wherein said cylindrical shell is that the other end of one end and the described central tube be communicated with described product water collecting chamber by described hollow fiber film thread is bonded together by one end of viscose glue and described cylindrical shell and formed.
The external pressure type hollow fiber membrane component of the annoying punching that aforesaid one end is fixed, the two ends of wherein said upper cover and described low head and described cylindrical shell are fastened together by Quick hoop.
The external pressure type hollow fiber membrane component of the annoying punching that aforesaid one end is fixed, wherein said water inlet and described air inlet are an angle of 90 degrees, and described product water delivery port and described dense water delivery port are an angle of 90 degrees.
The present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme, the external pressure type hollow fiber membrane component of the annoying punching that one end of the present invention is fixed at least has following advantages and beneficial effect: the external pressure type hollow fiber membrane component of the annoying punching that one end of the present invention is fixed is closed by single hollow fiber film thread one end, only the other end is fixed, being uniformly distributed of current can be conducive to, make hollow fiber film thread when backwash and air purge state, freely swing back and forth, film silk is inner without dead angle, thus strengthen the effect of backwash and air purge, make backwash and air purge thorough; And when producing water state; under this configuration, the flow velocity of former water on the surface of hollow fiber film thread can not lose due to structure non-resistance, thus can make the not easily dirty stifled film silk of the pollutant in former water; reduce the pollution speed of film silk, improve the service life of film silk; The external pressure type hollow fiber membrane component of annoying punching that simultaneously one end of the present invention is fixed can also reduce membrane module floor space, exempt pretreating process equipment needed for hollow fiber film assembly, reduce the cost of installation and maintenance.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of description, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the external pressure type hollow fiber membrane component of the annoying punching that one end of the present invention is fixed.
Fig. 2 is the sectional view of the external pressure type hollow fiber membrane component of the annoying punching that one end of the present invention is fixed.
Detailed description of the invention
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to its detailed description of the invention of external pressure type hollow fiber membrane component of the annoying punching fixed of one end proposed according to the present invention, structure, feature and effect thereof, be described in detail as follows.
Aforementioned and other technology contents, Characteristic for the present invention, can clearly present in the detailed description of following cooperation with reference to graphic preferred embodiment.By the explanation of detailed description of the invention, should to the present invention for the technological means reaching predetermined object and take and effect obtain one more deeply and concrete understanding, but institute's accompanying drawings is only to provide with reference to the use with explanation, is not used for being limited the present invention.
Refer to shown in Fig. 1 and Fig. 2, Fig. 1 is the schematic diagram of the external pressure type hollow fiber membrane component of the annoying punching that one end of the present invention is fixed.Fig. 2 is the sectional view of the external pressure type hollow fiber membrane component of the annoying punching that one end of the present invention is fixed.
The external pressure type hollow fiber membrane component of the annoying punching that one end of the present invention is fixed forms primarily of shell 10 and hollow fiber film thread 20.One end of shell 10 is provided with water inlet 131 and air inlet 132, and the other end is provided with and produces water delivery port 121 and dense water delivery port 122.Wherein, air inlet 132 is arranged at the center of shell 10 one end, and water inlet 131 is arranged at an angle at this end and air inlet 132; Dense water delivery port 122 is arranged at the center of shell 10 other end, produces water delivery port 121 and arranges at an angle at this end and dense water delivery port 122.As shown in Figure 1, in a preferred embodiment of the present invention, water inlet 131 of the present invention and air inlet 132, in an angle of 90 degrees, produce water delivery port 121 with dense water delivery port 122 in an angle of 90 degrees.Hollow fiber film thread 20 is arranged at the inner chamber of shell 10, and extends to the other end by one end of shell 10.Wherein, hollow fiber film thread 20 is closed near one end of water inlet 131 and air inlet 132, and is fixed on the inner chamber of shell 10 near the other end producing water delivery port 121 and dense water delivery port 122.As shown in Figure 2, the inner chamber of shell 10 is separated into and produces water collecting chamber 101 and water separation chamber 102.Wherein, produce water collecting chamber 101 and be positioned at one end that shell 10 is provided with product water delivery port 121 and dense water delivery port 122, produce water delivery port 121 and be communicated with product water collecting chamber 101.Also be provided with central tube 103 at the center of the inner chamber of shell 10, dense water delivery port 122 is connected with one end of central tube 103, and is communicated with water separation chamber 102 through producing water collecting chamber 101 by central tube 103.Hollow fiber film thread 20 is positioned at water separation chamber 102, and its one end being fixed on the inner chamber of shell 10 is communicated with product water collecting chamber 101.
Shell 10 of the present invention can comprise: cylindrical shell 11, upper cover 12 and low head 13, wherein, upper cover 12 and low head 13 are arranged at the two ends of cylindrical shell 11 respectively, water inlet 131 and air inlet 132 are arranged on low head 13, product water delivery port 121 and dense water delivery port 122 are arranged on upper cover 12, and hollow fiber film thread 10 is arranged in cylindrical shell 11.
In a preferred embodiment of the present invention, as shown in Figure 2, upper cover 12 and low head 13 can be respectively equipped with cavity.One end of cylindrical shell 11 can be openend, by this openend, the inner chamber of cylindrical shell 11 is communicated with the cavity of low head 13 and forms water separation chamber 102; The other end of cylindrical shell 11 can be blind end, and the cavity being closed upper cover 12 by this blind end forms product water collecting chamber 101.Wherein, the blind end of cylindrical shell 11 is fixed in one end that hollow fiber film thread 20 is communicated with product water collecting chamber 101, and the other end of central tube 103 is fixed on the blind end of cylindrical shell 11.
In the specific implementation, the blind end of cylindrical shell 11 of the present invention can be bonded together by one end of viscose glue and cylindrical shell 11 by hollow fiber film thread 20 and the other end producing one end that water collecting chamber 101 is communicated with and central tube 103 and formed.Upper cover 12 of the present invention and low head 13 can be fastened together by Quick hoop 30 with the two ends of cylindrical shell 11.
The course of work of hollow fiber film assembly of the present invention is described below:
When producing water state, the water separation chamber 102 that former water is flowed into by water inlet 131, is formed and produces water after water separation chamber 102 filters through hollow fiber film thread 20, and product water flows into product water collecting chamber 101 by hollow fiber film thread 20 and flows out from product water delivery port 121; The simultaneously dense water of formation water separation chamber 102 in, dense water is collected by central tube 103 and flows out from dense water delivery port 122.
When water backwash state, backwash water flows into product water collecting chamber 101 by producing water delivery port 121, and flow into water separation chamber 102 through hollow fiber film thread 20, the backwash water flowed in water separation chamber 102 is flowed out by water inlet 131 again.
When air purge state, clean compressed air blasts water separation chamber 102 by aeration head by air inlet 132, cleans hollow fiber film thread 20, then collects through central tube 103 and discharge from dense water delivery port 122.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art are not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (6)

1. one end external pressure type hollow fiber membrane component of annoying punching of fixing, is characterized in that it comprises: shell and hollow fiber film thread; One end of described shell is provided with water inlet and air inlet, and the other end is provided with and produces water delivery port and dense water delivery port; Wherein said air inlet is arranged at the center of described shell one end, and described water inlet is arranged at an angle at this end and described air inlet; Described dense water delivery port is arranged at the center of the described shell other end, and described product water delivery port is arranged at an angle at this end and described dense water delivery port;
Described hollow fiber film thread is arranged at the inner chamber of described shell, and extends to the other end by one end of described shell; Wherein said hollow fiber film thread is closed near one end of described water inlet and described air inlet, and the other end of close described product water delivery port and described dense water delivery port is fixed on the inner chamber of described shell;
The inner chamber of described shell is separated into and produces water collecting chamber and water separation chamber; Wherein said product water collecting chamber is positioned at one end that described shell is provided with described product water delivery port and described dense water delivery port, and described product water delivery port is communicated with described product water collecting chamber; Also be provided with central tube at the center of the inner chamber of described shell, described dense water delivery port is connected with one end of described central tube, and is communicated with described water separation chamber through described product water collecting chamber by described central tube; Described hollow fiber film thread is positioned at described water and is separated indoor, and its one end being fixed on the inner chamber of described shell is communicated with described product water collecting chamber.
2. the external pressure column type hollow fiber membrane modular of annoying punching is fixed in one end according to claim 1, it is characterized in that wherein said shell comprises: cylindrical shell, upper cover and low head, and described upper cover and described low head are arranged at the two ends of described cylindrical shell respectively; Wherein said water inlet and described air inlet are arranged on described low head, and described product water delivery port and described dense water delivery port are arranged on described upper cover, and described hollow fiber film thread is arranged in described cylindrical shell.
3. the external pressure column type hollow fiber membrane modular of annoying punching is fixed in one end according to claim 2, it is characterized in that wherein said upper cover and described low head are respectively equipped with cavity; One end of described cylindrical shell is openend, by described openend, the inner chamber of described cylindrical shell is communicated with the cavity of described low head and forms described water separation chamber; The other end of described cylindrical shell is blind end, and the cavity being closed described upper cover by described blind end forms described product water collecting chamber; The blind end of described cylindrical shell is fixed in one end that wherein said hollow fiber film thread is communicated with described product water collecting chamber, and the other end of described central tube is fixed on the blind end of described cylindrical shell.
4. the external pressure column type hollow fiber membrane modular of annoying punching is fixed in one end according to claim 3, it is characterized in that the blind end of wherein said cylindrical shell is that the other end of one end and the described central tube be communicated with described product water collecting chamber by described hollow fiber film thread is bonded together by one end of viscose glue and described cylindrical shell and formed.
5. the external pressure column type hollow fiber membrane modular of annoying punching is fixed in one end according to claim 2, it is characterized in that the two ends of wherein said upper cover and described low head and described cylindrical shell are fastened together by Quick hoop.
6. the external pressure column type hollow fiber membrane modular of annoying punching is fixed in the one end according to claim arbitrary in claim 1 to 5, it is characterized in that wherein said water inlet and described air inlet are an angle of 90 degrees, described product water delivery port and described dense water delivery port are an angle of 90 degrees.
CN201310652886.3A 2013-12-05 2013-12-05 Air-blast-available external pressure type hollow fiber membrane module with one fixed end Pending CN104689719A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310652886.3A CN104689719A (en) 2013-12-05 2013-12-05 Air-blast-available external pressure type hollow fiber membrane module with one fixed end

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310652886.3A CN104689719A (en) 2013-12-05 2013-12-05 Air-blast-available external pressure type hollow fiber membrane module with one fixed end

Publications (1)

Publication Number Publication Date
CN104689719A true CN104689719A (en) 2015-06-10

Family

ID=53337496

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310652886.3A Pending CN104689719A (en) 2013-12-05 2013-12-05 Air-blast-available external pressure type hollow fiber membrane module with one fixed end

Country Status (1)

Country Link
CN (1) CN104689719A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105664719A (en) * 2016-04-17 2016-06-15 王丽莉 Automatic washing device and method for water purifier
CN106268330A (en) * 2016-09-21 2017-01-04 山东膜源水净化科技有限公司 A kind of hyperfiltration membrane assembly of porous water inlet pipe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1446618A (en) * 2003-04-18 2003-10-08 清华大学 External pressure pillar type hollow fiber films subassemblies capable of air blast
US20040035779A1 (en) * 2000-09-13 2004-02-26 Klaus Vossenkaul Membrane filter for water treatment
CN201147676Y (en) * 2008-01-18 2008-11-12 孟广祯 Explosive external pressure weeping willow hollow fiber membrane or capillary membrane filter
CN101757853A (en) * 2010-03-20 2010-06-30 杭州天创净水设备有限公司 External pressure-type hollow fiber membrane module with antipollution structure and cleaning system
CN204017675U (en) * 2013-12-05 2014-12-17 北京大井易通科技发展有限公司 The external pressure type hollow fiber membrane component of the annoying punching that one end is fixed

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040035779A1 (en) * 2000-09-13 2004-02-26 Klaus Vossenkaul Membrane filter for water treatment
CN1446618A (en) * 2003-04-18 2003-10-08 清华大学 External pressure pillar type hollow fiber films subassemblies capable of air blast
CN201147676Y (en) * 2008-01-18 2008-11-12 孟广祯 Explosive external pressure weeping willow hollow fiber membrane or capillary membrane filter
CN101757853A (en) * 2010-03-20 2010-06-30 杭州天创净水设备有限公司 External pressure-type hollow fiber membrane module with antipollution structure and cleaning system
CN204017675U (en) * 2013-12-05 2014-12-17 北京大井易通科技发展有限公司 The external pressure type hollow fiber membrane component of the annoying punching that one end is fixed

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105664719A (en) * 2016-04-17 2016-06-15 王丽莉 Automatic washing device and method for water purifier
CN106268330A (en) * 2016-09-21 2017-01-04 山东膜源水净化科技有限公司 A kind of hyperfiltration membrane assembly of porous water inlet pipe

Similar Documents

Publication Publication Date Title
CN101254409A (en) Double-ended water production submerged hollow fiber membrane module
CN203112587U (en) Water treatment device of rotary flat membrane bioreactor
CN203408632U (en) Ultrafiltration membrane component
CN102389712A (en) External-pressure type hollow fiber ultrafiltration membrane assembly with turbulence promoter structure
CN104689719A (en) Air-blast-available external pressure type hollow fiber membrane module with one fixed end
CN205586840U (en) Hollow fiber membrane subassembly and use membrane unit of this subassembly to strain a section of thick bamboo
CN204017675U (en) The external pressure type hollow fiber membrane component of the annoying punching that one end is fixed
CN205556171U (en) Multistage milipore filter festival water purification system
CN101264975B (en) Column-type film components
CN201140036Y (en) reverse osmosis filter
CN204619758U (en) A kind of hollow fiber film assembly being applicable to external membrane bioreactor
CN204298132U (en) A kind of totally-enclosed pillar replaceable cartridge MBR device
CN204193794U (en) A kind of milipore filter water purification assembly with water jet device flusher
CN105935553A (en) Multi-tube water distribution hollow filter ultrafilter membrane assembly
CN204897563U (en) Water purifier filter equipment
CN110228834B (en) Self-flowing water treatment system capable of backwashing
CN212731717U (en) Novel ultrafiltration membrane filtering device
CN209828558U (en) Waste gas purification device is used in tombarthite production
CN203777942U (en) Hollow fiber ultrafiltration membrane separation device
CN103252165B (en) Water purifier with hollow microfiltration membranes
CN202778282U (en) External-pressure type microfiltration/ultrafiltration membrane separation device capable of running with low energy consumption
CN204714586U (en) A kind of tubular fibre curtain type membrane equipment
CN201506996U (en) A water storage pressurization system and a horizontal pressure-bearing water storage tank used in the system
CN207025103U (en) Internal pressure tube type filter membrance
CN205815484U (en) A kind of film group in reverse osmosis unit

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20150610

WD01 Invention patent application deemed withdrawn after publication