CN111346476A - Volatile gas collecting device - Google Patents
Volatile gas collecting device Download PDFInfo
- Publication number
- CN111346476A CN111346476A CN201811592282.3A CN201811592282A CN111346476A CN 111346476 A CN111346476 A CN 111346476A CN 201811592282 A CN201811592282 A CN 201811592282A CN 111346476 A CN111346476 A CN 111346476A
- Authority
- CN
- China
- Prior art keywords
- collecting box
- box
- gas
- collection
- guide pipe
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 46
- 239000007789 gas Substances 0.000 abstract description 45
- 229910000041 hydrogen chloride Inorganic materials 0.000 abstract description 26
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 abstract description 26
- 239000012670 alkaline solution Substances 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract description 2
- 239000003595 mist Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000019614 sour taste Nutrition 0.000 description 1
- 235000013599 spices Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a volatile gas collecting device which comprises an upper collecting box and a lower collecting box, wherein the upper collecting box is arranged at the top of the lower collecting box and is fixedly connected with the lower collecting box; go up the collecting box top and be equipped with evenly distributed's atomizer, just atomizer runs through the collecting box to with last collecting box fixed connection, the one side of going up the collecting box is equipped with the gas stand pipe, just gas stand pipe and last collecting box intercommunication, this kind of volatile gas collection device, through a plurality of atomizer of installation, can be vaporific spraying with water, increased the area with the hydrogen chloride contact, can effectual absorption hydrogen chloride gas body, simultaneously also relatively save the water, when the hydrogen chloride that fails timely processing, can handle through the reaction tank that is equipped with alkaline solution, take place chemical reaction, avoided hydrogen chloride gas body to get into the atmosphere polluted environment, protected the environment.
Description
Technical Field
The invention relates to the technical field of collecting devices, in particular to a volatile gas collecting device.
Background
Volatile gases are various, such as hydrogen chloride, which is colorless and pungent, concentrated hydrochloric acid is colorless liquid, the concentrated hydrochloric acid is filled in a bottle, white mist is generated at the bottle mouth after a while (the white mist is small drops of hydrochloric acid generated by combining water vapor in the air after the hydrogen chloride is volatilized due to strong volatility of the hydrochloric acid), the concentrated hydrochloric acid has pungent sour taste, industrial hydrochloric acid is slightly yellow due to impurity trivalent ferric salt, the concentrated hydrochloric acid is easy to dissolve in water, and at the temperature of 0 ℃, 1 volume of water can dissolve about 500 volumes of hydrogen chloride. The aqueous solution of hydrogen chloride is acidic, called hydrochloric acid, belongs to strong acid, is customarily called hydrochloric acid, and is mainly used for preparing dyes, spices, medicines, various chlorides and corrosion inhibitors, the hydrochloric acid is the aqueous solution of hydrogen chloride, is colorless or yellowish liquid, is easy to volatilize, and can recover the hydrogen chloride gas and avoid the problem of environmental harm due to the harmfulness of the hydrogen chloride and a corresponding hydrogen chloride gas collecting device.
The existing volatile gas collecting device adopts the conventional water barrel for water absorption, can not rapidly absorb hydrogen chloride gas, and can not treat the absorbed hydrogen chloride gas to cause corresponding environmental pollution.
Therefore, how to design a volatile gas collecting device becomes a problem to be solved currently.
Disclosure of Invention
The invention aims to provide a volatile gas collecting device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a volatile gas collecting device comprises an upper collecting box and a lower collecting box, wherein the upper collecting box is arranged at the top of the lower collecting box and is fixedly connected with the lower collecting box; the top of the upper collecting box is provided with evenly distributed atomizing nozzles, the atomizing nozzles penetrate through the upper collecting box and are fixedly connected with the upper collecting box, one side of the upper collecting box is provided with a gas guide pipe, and the gas guide pipe is communicated with the upper collecting box;
the surface of the lower collecting box is provided with a first switch door, the first switch door is movably connected with the lower collecting box through a hinge, the bottom of the lower collecting box is provided with universal wheels, the bottom wall of the lower collecting box is provided with a base, the top of the base is provided with a collecting barrel, and the collecting barrel is perpendicular to the base and is fixedly connected with the base;
the diaphragm is installed to one side of going up the collecting box, the top of diaphragm is equipped with handles the case, just it sets up with the diaphragm is perpendicular to handle the case, the inside of handling the case is equipped with the reaction tank, the surface of handling the case is equipped with second switch door, just second switch door closes swing joint through the page or leaf with handling the case, the fixed plate is installed to one side symmetry of handling the case.
Furthermore, the top of atomizer is equipped with water pipe connector, just water pipe connector and atomizer intercommunication.
Furthermore, a connecting port is arranged at one end of the gas guide pipe and is communicated with the gas guide pipe.
Furthermore, a connecting pipe is arranged in the middle of the bottom wall of the upper collecting box, and the upper collecting box is communicated with the collecting barrel through the connecting pipe.
Furthermore, a guide pipe is arranged on one side of the upper collecting box, and the upper collecting box is communicated with the treatment box through the guide pipe.
Furthermore, the surface of the fixing plate is uniformly distributed with round holes, and the round holes penetrate through the fixing plate.
Compared with the prior art, the invention has the beneficial effects that: this kind of volatile gas collection device through a plurality of atomizer of installation, can be vaporific spraying out with water, has increased the area with the hydrogen chloride contact, can effectual absorption hydrogen chloride gas, also relatively saves the water simultaneously, and when the hydrogen chloride that fails timely processing, can handle through the reaction tank that is equipped with alkaline solution, takes place chemical reaction, has avoided hydrogen chloride gas to get into the atmosphere polluted environment, has protected the environment.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a longitudinal cross-sectional view of the lower collection tank, upper collection tank and process tank of FIG. 1 of the present invention;
FIG. 3 is a schematic view of a portion of the treatment tank of FIG. 1 according to the present invention.
In the figure: 1-lower collection box; 2-universal wheels; 3-a first switch door; 4-a gas guide pipe; 5-a connecting port; 6-an upper collection box; 7-a water pipe connector; 8-an atomizing spray head; 9-a treatment box; 10-a transverse plate; 11-a base; 12-a collection barrel; 13-a connecting tube; 14-a catheter; 15-a reaction tank; 16-a second switch door; 17-fixing the plate; 18-circular hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: a volatile gas collecting device comprises an upper collecting box 6 and a lower collecting box 1, wherein the upper collecting box 6 is arranged at the top of the lower collecting box 1 and is fixedly connected with the lower collecting box 1; the top of the upper collecting box 6 is provided with evenly distributed atomizing nozzles 8, the atomizing nozzles 8 penetrate through the upper collecting box 6 and are fixedly connected with the upper collecting box 6, one side of the upper collecting box 6 is provided with a gas guide pipe 4, and the gas guide pipe 4 is communicated with the upper collecting box 6;
the surface of the lower collecting box 1 is provided with a first switch door 3, the first switch door 3 is movably connected with the lower collecting box 1 through a hinge, the bottom of the lower collecting box 1 is provided with a universal wheel 2, the bottom wall of the lower collecting box 1 is provided with a base 11, the top of the base 11 is provided with a collecting barrel 12, and the collecting barrel 12 is perpendicular to the base 11 and is fixedly connected with the base 11;
go up one side of collecting box 6 and install diaphragm 10, the top of diaphragm 10 is equipped with handles case 9, and handle case 9 and the perpendicular setting of diaphragm 10, the inside of handling case 9 is equipped with reaction tank 15, the surface of handling case 9 is equipped with second switch door 16, and second switch door 16 with handle case 9 through page or leaf and close swing joint, fixed plate 17 is installed to one side symmetry of handling case 9, add alkaline solution in reaction tank 15, when the hydrogen chloride gas body that fails in time to handle, just can get into through pipe 14 and handle in the case 9, thereby take place chemical reaction with the alkaline solution in the reaction tank 15, generate pollution-free salt class material with the hydrogen chloride gas reaction.
In the invention, a water pipe connector 7 is arranged on the top of an atomizing spray head 8, the water pipe connector 7 is communicated with the atomizing spray head 8, and is connected with an external water pipe through the water pipe connector 7, so that water enters the atomizing spray head 8 and is sprayed in the upper collecting box 6 in a mist shape, one end of the gas guide pipe 4 is provided with a connector 5, the connector 5 is communicated with the gas guide pipe 4 and can be connected with a gas dredging pipe through the connector 5, thus volatilized gas enters the upper collecting box 6 through the gas guide pipe 4 to be collected, a connecting pipe 13 is arranged in the middle position of the bottom wall of the upper collecting box 6, the upper collecting box 6 is communicated with a collecting barrel 12 through the connecting pipe 13, water absorbing volatilized gas in the upper collecting box 6 can be guided into the collecting barrel 12 through the connecting pipe 13 to be collected, one side of the upper collecting box 6 is provided with a guide pipe 14, and the upper collecting box 6 is communicated, can be with failing in the absorbed volatile gas guide entering handles case 9 through pipe 14 to volatile gas is fallen its reaction through chemical method, avoids polluted environment's problem to take place, fixed plate 17's surperficial evenly distributed's round hole 18, and its round hole 18 runs through fixed plate 17, runs through round hole 18 through external screw rod, can be with handling case 9 and fixing the surface at diaphragm 10.
The working principle is as follows: firstly, the water pipe connector 7 is connected with an external water pipe, the connector 5 is connected with an external gas leading pipe, the second switch door 16 is opened, alkaline solution is added into the reaction tank 15, then the second switch door 16 is closed, when volatile gas hydrogen chloride enters the upper collection box 6 from the gas guide pipe 4, the valve of the external water pipe can be opened, water enters the atomizing nozzle 8 through the water pipe connector 7 and is sprayed out from the atomizing nozzle 8, the sprayed water is in a mist shape, hydrogen chloride gas can be effectively absorbed, the water mist absorbing the hydrogen chloride gas is gathered into water flow on the bottom wall of the upper collection box 6 and flows into the collection barrel 12 through the connecting pipe 13, hydrogen chloride gas which cannot be timely processed enters the processing box 9 through the guide pipe 14, and chemical reaction is carried out on the alkaline solution in the reaction tank 15, the hydrogen chloride gas is reacted to generate pollution-free salt substances, so that the environment is protected, and finally the collecting barrel 12 is taken out from the lower collecting box 1 and then distilled, so that the hydrogen chloride can be recycled.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a volatile gaseous collection device, includes collection box (6) and lower collection box (1), its characterized in that: the upper collecting box (6) is arranged at the top of the lower collecting box (1) and is fixedly connected with the lower collecting box (1); the top of the upper collection box (6) is provided with evenly distributed atomizing nozzles (8), the atomizing nozzles (8) penetrate through the upper collection box (6) and are fixedly connected with the upper collection box (6), one side of the upper collection box (6) is provided with a gas guide pipe (4), and the gas guide pipe (4) is communicated with the upper collection box (6);
the surface of the lower collection box (1) is provided with a first switch door (3), the first switch door (3) is movably connected with the lower collection box (1) through a hinge, the bottom of the lower collection box (1) is provided with universal wheels (2), the bottom wall of the lower collection box (1) is provided with a base (11), the top of the base (11) is provided with a collection barrel (12), and the collection barrel (12) is vertically arranged with the base (11) and fixedly connected with the base (11);
go up one side of collecting box (6) and install diaphragm (10), the top of diaphragm (10) is equipped with handles case (9), just handle case (9) and perpendicular setting of diaphragm (10), the inside of handling case (9) is equipped with reaction tank (15), the surface of handling case (9) is equipped with second switch door (16), just second switch door (16) with handle case (9) through page or leaf and close swing joint, fixed plate (17) are installed to one side symmetry of handling case (9).
2. The volatile gas collection device of claim 1, wherein: the top of atomizer (8) is equipped with water pipe connector (7), just water pipe connector (7) and atomizer (8) intercommunication.
3. The volatile gas collection device of claim 1, wherein: one end of the gas guide pipe (4) is provided with a connecting port (5), and the connecting port (5) is communicated with the gas guide pipe (4).
4. The volatile gas collection device of claim 1, wherein: the middle position of the bottom wall of the upper collecting box (6) is provided with a connecting pipe (13), and the upper collecting box (6) is communicated with the collecting barrel (12) through the connecting pipe (13).
5. The volatile gas collection device of claim 1, wherein: a guide pipe (14) is arranged on one side of the upper collecting box (6), and the upper collecting box (6) is communicated with the treatment box (9) through the guide pipe (14).
6. The volatile gas collection device of claim 1, wherein: the surface of the fixing plate (17) is uniformly distributed with round holes (18), and the round holes (18) penetrate through the fixing plate (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811592282.3A CN111346476A (en) | 2018-12-21 | 2018-12-21 | Volatile gas collecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811592282.3A CN111346476A (en) | 2018-12-21 | 2018-12-21 | Volatile gas collecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111346476A true CN111346476A (en) | 2020-06-30 |
Family
ID=71188455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811592282.3A Pending CN111346476A (en) | 2018-12-21 | 2018-12-21 | Volatile gas collecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111346476A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201912877U (en) * | 2010-09-10 | 2011-08-03 | 上海市固体废物处置中心 | System for processing medical waste incineration tail gas containing high concentration hydrogen chloride |
| US20150190604A1 (en) * | 2014-01-07 | 2015-07-09 | Hsin-Yung Lin | Gas generating system for health use |
| CN207462978U (en) * | 2017-11-02 | 2018-06-08 | 衡阳市盛亚化工科技有限公司 | A kind of Chlorcosane tail gas processing system |
| CN207684879U (en) * | 2017-12-06 | 2018-08-03 | 启东久星化工有限公司 | Hydrogen chloride gas retracting device |
| CN108379958A (en) * | 2018-02-07 | 2018-08-10 | 苏州甫腾智能科技有限公司 | A kind of industrial automation emission-control equipment |
-
2018
- 2018-12-21 CN CN201811592282.3A patent/CN111346476A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201912877U (en) * | 2010-09-10 | 2011-08-03 | 上海市固体废物处置中心 | System for processing medical waste incineration tail gas containing high concentration hydrogen chloride |
| US20150190604A1 (en) * | 2014-01-07 | 2015-07-09 | Hsin-Yung Lin | Gas generating system for health use |
| CN207462978U (en) * | 2017-11-02 | 2018-06-08 | 衡阳市盛亚化工科技有限公司 | A kind of Chlorcosane tail gas processing system |
| CN207684879U (en) * | 2017-12-06 | 2018-08-03 | 启东久星化工有限公司 | Hydrogen chloride gas retracting device |
| CN108379958A (en) * | 2018-02-07 | 2018-08-10 | 苏州甫腾智能科技有限公司 | A kind of industrial automation emission-control equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020228853A2 (en) | Exhaust gas treatment apparatus | |
| CN111346476A (en) | Volatile gas collecting device | |
| CN209188447U (en) | A kind of hydrogen chloride absorption tower with net depressed structure for pyridaben production | |
| CN203540313U (en) | Hydrogen chloride tail gas absorption device | |
| CN202237756U (en) | Safety liquid-sealed tank | |
| CN206454481U (en) | A kind of quenching high-pressure spraying dust arrester | |
| CN213885674U (en) | Industrial waste gas treatment tower | |
| CN107385128A (en) | A kind of blast furnace gas spraying methods of eliminating acidity and device for not reducing calorific value of gas | |
| CN204093295U (en) | A kind of desulfurizing tower import sprayer unit | |
| CN203899438U (en) | High-efficiency durable neutralizing tower | |
| CN209530478U (en) | It is a kind of to purify clean nut production flue gas processing device | |
| CN209535479U (en) | A kind of unmanned plane pesticide spraying system | |
| CN203853010U (en) | Residual gas treatment system of rotary kiln | |
| CN209392987U (en) | A kind of scrubbing tower handling mercury fume | |
| CN208212853U (en) | A kind of solid waste flue gas removes acid tower with wet type | |
| CN203663263U (en) | Gas breather | |
| CN205948556U (en) | Plant liquid spray column | |
| CN210752098U (en) | Regeneration exhaust gas desulfurization system based on adsorption desulfurization catalyst | |
| CN205700048U (en) | Acid mist waste gas water seal multiple treating system | |
| CN215276600U (en) | Spray desulfurizing tower | |
| CN205392159U (en) | Waste gas treatment device | |
| CN214075834U (en) | Accident solution recycling device for ammonia water production accident system | |
| CN210188003U (en) | Waste gas recovery device of lithium battery pole piece coating equipment | |
| CN204672069U (en) | For having the water washing dedust device except haze function in purification of air unit | |
| CN212881756U (en) | Closed storehouse toxic gas recovery unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200630 |
|
| WD01 | Invention patent application deemed withdrawn after publication |