CN116832505A - Filter device for chip catcher and use method - Google Patents
Filter device for chip catcher and use method Download PDFInfo
- Publication number
- CN116832505A CN116832505A CN202310812959.4A CN202310812959A CN116832505A CN 116832505 A CN116832505 A CN 116832505A CN 202310812959 A CN202310812959 A CN 202310812959A CN 116832505 A CN116832505 A CN 116832505A
- Authority
- CN
- China
- Prior art keywords
- wall
- cylinder
- filter cylinder
- chuck
- filter
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 26
- 238000007790 scraping Methods 0.000 claims abstract description 22
- 230000002035 prolonged effect Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 3
- 239000010813 municipal solid waste Substances 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 claims description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims 2
- 241001330002 Bambuseae Species 0.000 claims 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 2
- 239000011425 bamboo Substances 0.000 claims 2
- 238000004140 cleaning Methods 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G31/00—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for
- C10G31/09—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for by filtration
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
Abstract
The invention relates to the technical field of filter cartridges, in particular to a filter device for a chip catcher and a use method thereof, comprising the following steps: the top of the carrying cylinder is fixedly connected with an oil inlet pipe, the middle section of the side wall of the carrying cylinder is hermetically connected with an oil discharge pipe, and the inner wall of the bottom end of the carrying cylinder is in threaded connection with a mounting seat; the chuck is in sliding connection with the inner wall of the bearing cylinder, the chuck is fixedly connected with a filter cylinder, and the bottom end of the filter cylinder is connected with the mounting seat through a clamp; the rotating shaft is rotationally connected with the chuck at one end, away from the chuck, of the rotating shaft, is rotationally connected with the mounting seat, is fixedly connected with a spiral blade on the rotating shaft body, is positioned inside the filter cylinder and is in sliding connection with the inner wall of the filter cylinder, sweeps waste scraps on the inner wall of the filter cylinder through the spiral blade, and is conveyed to the bottom collecting tank for collection, when the cleaning impurities avoid blocking, the concentration of impurities inside the filter cylinder is continuously reduced, the scraping resistance of a scraping plate is avoided, and the side wall of the filter cylinder is extruded by the secondary adhesion easily when the follow-up scraping plate scrapes the inner wall of the filter cylinder, so that the service life of the filter cylinder is prolonged.
Description
Technical Field
The invention relates to the technical field of filter cartridges, in particular to a filter device for a chip catcher and a use method thereof.
Background
The chip catcher is mainly used for collecting plugging materials used in well leakage during drilling, bridge plug scraps discharged in a returning manner during bridge plug drilling and the like into the filter cylinder in the ground metering operation process of oil testing, so that the safety and the continuity of downstream operation are ensured.
In the prior art, in order to ensure that the side wall of a filter cylinder in the internal filter device of the dust catcher is neat and avoid blockage, a motor is adopted to drive a vertical scraping plate to scrape the inner wall of the filter cylinder so as to achieve the effect of clearing blockage.
However, when scraping impurities on the inner side wall of the filter cylinder by adopting the vertical scraping plate, the scraped impurities still suspend in the filter cylinder body, the impurity concentration in the filter cylinder body is gradually accumulated, the scraping resistance of the scraping plate is increased, and the filter cylinder side wall is easily extruded by secondary adhesion when the follow-up scraping plate scrapes the inner wall of the filter cylinder, so that the service life of the filter cylinder is influenced.
Disclosure of Invention
The invention aims to provide a filter device for a chip catcher, which solves the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a filter device for a chip catcher, comprising:
the bearing cylinder is fixedly connected with an oil inlet pipe at the top of the bearing cylinder, an oil discharge pipe is connected with the middle section of the side wall of the bearing cylinder in a sealing manner, and an installation seat is connected with the inner wall of the bottom end of the bearing cylinder in a threaded manner;
the chuck is in sliding connection with the inner wall of the bearing cylinder, the chuck is fixedly connected with a filter cylinder, and the bottom end of the filter cylinder is connected with the mounting seat clamp; a kind of electronic device with high-pressure air-conditioning system
The rotating shaft is characterized in that one end of the rotating shaft is rotationally connected with the chuck, one end of the rotating shaft, which is far away from the chuck, is rotationally connected with the mounting seat, a spiral blade is fixedly connected to the rotating shaft body, and the spiral blade is positioned inside the filter cylinder and is in sliding connection with the inner wall of the filter cylinder.
Preferably, the top end opening of the bearing cylinder is provided with a flange, the end part of the oil inlet pipe is provided with a flange, the two flanges are fixedly connected through bolts, and a plurality of bolts are arranged.
Preferably, the motor is fixedly connected to the center of the bottom end of the mounting seat, and the sealing treatment is carried out at the threaded connection part of the mounting seat and the inner wall of the bearing cylinder.
Preferably, the chuck is wholly in a ring shape, the inner annular wall of the chuck is fixedly connected with a rotating seat through connecting rods, the four connecting rods are arranged, the four connecting rods are distributed in a cross shape, and the rotating seat is rotationally connected with the top end of the rotating shaft.
Preferably, an annular groove is formed in one side of the mounting seat, the annular groove is connected with the clamping hoop at the bottom end of the filter cylinder, and a sealing gasket is arranged at the bottom end inside the annular groove.
Preferably, the mounting seat is positioned at the bottom end inside the bearing cylinder, and a material collecting groove is formed in the center of one surface, close to the annular groove, of the mounting seat.
Preferably, the bottom end of the rotating shaft penetrates through the bottom wall of the material collecting tank to be fixedly connected with the output end of the motor, and the rotating joint of the rotating shaft and the bottom wall of the material collecting tank is subjected to sealing treatment.
The application method of the filter device for the chip catcher comprises the following steps: the trash impurities on the inner wall of the filter cylinder are scraped through the spiral blades and conveyed to the bottom aggregate groove for collection, the impurity concentration inside the filter cylinder is continuously reduced while the impurities are cleaned to avoid blockage, the scraping resistance of the scraping plate is increased by the high-concentration impurities, the side wall of the filter cylinder is extruded by the secondary adhesion easily when the inner wall of the filter cylinder is scraped by the follow-up scraping plate, and the service life of the filter cylinder is prolonged.
Compared with the prior art, the invention has the beneficial effects that:
the invention has simple structure, scrapes the scraps and impurities on the inner wall of the filter cylinder by the spiral blades, conveys the scraps and impurities to the bottom aggregate tank for collection, continuously reduces the impurity concentration in the filter cylinder while cleaning the impurities to avoid blockage, avoids the increase of scraping resistance of the scraping plate by high-concentration impurities, and easily secondarily adheres to and extrudes the side wall of the filter cylinder when the follow-up scraping plate scrapes the inner wall of the filter cylinder, thereby prolonging the service life of the filter cylinder.
Drawings
FIG. 1 is a schematic diagram of the overall internal structure of the present invention;
FIG. 2 is a schematic view of a chuck according to the present invention;
fig. 3 is a cross-sectional view of the mounting structure of the present invention.
In the figure: 1. a carrying cylinder; 2. an oil inlet pipe; 3. a motor; 4. a rotating shaft; 5. a helical blade; 6. a filter cartridge; 7. a chuck; 8. a mounting base; 9. an oil drain pipe; 10. a bolt; 11. a material collecting groove; 12. a rotating seat; 13. a connecting rod; 14. and a ring groove.
Detailed Description
In order to make the objects, technical solutions, and advantages of the present invention more apparent, the embodiments of the present invention will be further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are some, but not all, embodiments of the present invention, are intended to be illustrative only and not limiting of the embodiments of the present invention, and that all other embodiments obtained by persons of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," "horizontal," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "a," an, "" the first, "" the second, "" the third, "" the fourth, "" the fifth, "and the sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
For purposes of brevity and description, the principles of the embodiments are described primarily by reference to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one of ordinary skill in the art that the embodiments may be practiced without limitation to these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.
Referring to fig. 1 to 3, the present invention provides a technical solution: a filter device for a chip catcher, comprising:
the bearing cylinder 1, the top of the bearing cylinder 1 is fixedly connected with an oil inlet pipe 2, the middle section of the side wall of the bearing cylinder 1 is hermetically connected with an oil discharge pipe 9, and the inner wall of the bottom end of the bearing cylinder 1 is in threaded connection with an installation seat 8; the top end opening of the bearing cylinder 1 is provided with a flange, the end part of the oil inlet pipe 2 is provided with a flange, the two flanges are fixedly connected through bolts 10, and a plurality of bolts 10 are arranged; the motor 3 is fixedly connected to the center of the bottom end of the mounting seat 8, and the sealing treatment is carried out on the threaded connection part of the mounting seat 8 and the inner wall of the bearing cylinder 1.
The chuck 7 is in sliding connection with the inner wall of the bearing cylinder 1, the chuck 7 is fixedly connected with the filter cylinder 6, and the bottom end of the filter cylinder 6 is in clamping connection with the mounting seat 8; the whole chuck 7 is in a circular ring shape, the inner annular wall of the chuck 7 is fixedly connected with a rotating seat 12 through connecting rods 13, the number of the connecting rods 13 is four, the four connecting rods 13 are distributed in a cross shape, and the rotating seat 12 is rotationally connected with the top end of the rotating shaft 4; one side of the mounting seat 8 is provided with a ring groove 14, the ring groove 14 is connected with the bottom end of the filter cartridge 6 through a clamp, and the bottom end inside the ring groove 14 is provided with a sealing gasket.
One end of the rotating shaft 4 is rotationally connected with the chuck 7, one end of the rotating shaft 4 far away from the chuck 7 is rotationally connected with the mounting seat 8, a spiral blade 5 is fixedly connected to the shaft body of the rotating shaft 4, and the spiral blade 5 is positioned inside the filter cylinder 6 and is in sliding connection with the inner wall of the filter cylinder 6; the mounting seat 8 is positioned at the bottom end inside the bearing cylinder 1, and a material collecting groove 11 is formed in the center of one surface, close to the annular groove 14, of the mounting seat 8; the bottom end of the rotating shaft 4 penetrates through the bottom wall of the material collecting groove 11 and is fixedly connected with the output end of the motor 3, and the rotating joint of the rotating shaft 4 and the bottom wall of the material collecting groove 11 is subjected to sealing treatment.
A method of using the filter device for chip traps according to any one of claims 1-7, comprising the steps of: the trash impurities on the inner wall of the filter cylinder are scraped through the spiral blades and conveyed to the bottom aggregate groove for collection, the impurity concentration inside the filter cylinder is continuously reduced while the impurities are cleaned to avoid blockage, the scraping resistance of the scraping plate is increased by the high-concentration impurities, the side wall of the filter cylinder is extruded by the secondary adhesion easily when the inner wall of the filter cylinder is scraped by the follow-up scraping plate, and the service life of the filter cylinder is prolonged.
When the device works, the oil inlet pipe 2 is fixedly connected to the upper end of the bearing cylinder 1 through the bolt 10, the rotating shaft 4 and the helical blade 5 slide into the back of the filter cylinder 6, the top end of the rotating shaft 4 is inserted into the rotating seat 12, the bottom end of the filter cylinder 6 is clamped into the annular groove 14, finally the whole filter device slides into the bearing cylinder 1 through the end of the chuck 7, the inside of the box of the rotating mounting seat 8 is tightly pressed and sealed, the bottom end of the oil inlet pipe 2 and the upper end of the chuck 7 are tightly pressed and sealed, and the bottom end of the filter cylinder 6 and the annular groove 14 are tightly pressed and sealed by the preset sealing gasket, oil enters the inside of the filter cylinder 6 through the gap of the connecting rod 13 on the chuck 7 through the oil inlet pipe 2, the filter cylinder 6 is filtered, the internal positive pressure environment of the bearing cylinder 1 is generated due to the continuous pumping of the oil inlet pipe 2, finally the oil discharge pipe 9 is discharged, the motor 3 is started, the helical blade 5 is driven to continuously rotate to scrape impurities on the inner side wall of the filter cylinder 6, and the impurities are transported towards the lower end, the inside of the collecting groove 11 are collected, the collecting groove 11 is cleaned, the impurities are scraped through the helical blade to scrape the inner wall of the filter cylinder 6, the impurities on the filter cylinder 6 are conveyed to the bottom collecting groove 11, and the filter cylinder 6 is easily to be prevented from being continuously scraped, and the inner wall after the filter cylinder is easy to be scraped by the scraping the inner wall of the filter cylinder 6, and the filter cylinder is prolonged, and the service life is prolonged.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A filter device for chip traps, characterized in that: comprising the following steps:
the bearing cylinder (1), the top of the bearing cylinder (1) is fixedly connected with an oil inlet pipe (2), the middle section of the side wall of the bearing cylinder (1) is hermetically connected with an oil discharge pipe (9), and the inner wall of the bottom end of the bearing cylinder (1) is in threaded connection with an installation seat (8);
the chuck (7), the inner wall sliding connection of said chuck (7) and bearing tube (1), the chuck (7) fixedly connected with filters the cartridge (6), the bottom of the said cartridge (6) is connected with the mounting seat (8) clamp; a kind of electronic device with high-pressure air-conditioning system
The rotary shaft (4), pivot (4) one end is connected with chuck (7) rotation, and the one end that chuck (7) was kept away from to pivot (4) is connected with mount pad (8) rotation, fixedly connected with helical blade (5) on pivot (4) shaft body, helical blade (5) are located inside straining a section of thick bamboo (6), and with strain a section of thick bamboo (6) inner wall sliding connection.
2. A filter device for chip traps according to claim 1, characterized in that: the bearing cylinder is characterized in that a flange is arranged at the top end opening of the bearing cylinder (1), the end part of the oil inlet pipe (2) is provided with flanges, the two flanges are fixedly connected through bolts (10), and a plurality of bolts (10) are arranged.
3. A filter device for chip traps according to claim 2, characterized in that: the motor (3) is fixedly connected to the center of the bottom end of the mounting seat (8), and the sealing treatment is carried out on the threaded connection part of the mounting seat (8) and the inner wall of the bearing cylinder (1).
4. A filter device for chip traps according to claim 3, wherein: the chuck (7) is integrally annular, the inner annular wall of the chuck (7) is fixedly connected with a rotating seat (12) through connecting rods (13), the four connecting rods (13) are arranged, the four connecting rods (13) are distributed in a cross shape, and the rotating seat (12) is rotationally connected with the top end of the rotating shaft (4).
5. The filter device for chip-catcher according to claim 4, wherein: an annular groove (14) is formed in one side of the mounting seat (8), the annular groove (14) is connected with the bottom end of the filter cylinder (6) through a clamp, and a sealing gasket is arranged at the bottom end inside the annular groove (14).
6. The filter device for chip-catcher according to claim 5, wherein: the mounting seat (8) is positioned at the bottom end inside the bearing cylinder (1), and a material collecting groove (11) is formed in the center of one surface, close to the annular groove (14), of the mounting seat (8).
7. The filter device for chip-catcher according to claim 6, wherein: the bottom end of the rotating shaft (4) penetrates through the bottom wall of the material collecting groove (11) to be fixedly connected with the output end of the motor (3), and the rotating joint of the rotating shaft (4) and the bottom wall of the material collecting groove (11) is subjected to sealing treatment.
8. A method of using the filter device for chip traps according to any one of claims 1-7, characterized in that: the method comprises the following steps: the trash impurities on the inner wall of the filter cylinder are scraped through the spiral blades and conveyed to the bottom aggregate groove for collection, the impurity concentration inside the filter cylinder is continuously reduced while the impurities are cleaned to avoid blockage, the scraping resistance of the scraping plate is increased by the high-concentration impurities, the side wall of the filter cylinder is extruded by the secondary adhesion easily when the inner wall of the filter cylinder is scraped by the follow-up scraping plate, and the service life of the filter cylinder is prolonged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310812959.4A CN116832505A (en) | 2023-06-30 | 2023-06-30 | Filter device for chip catcher and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310812959.4A CN116832505A (en) | 2023-06-30 | 2023-06-30 | Filter device for chip catcher and use method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116832505A true CN116832505A (en) | 2023-10-03 |
Family
ID=88161250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310812959.4A Withdrawn CN116832505A (en) | 2023-06-30 | 2023-06-30 | Filter device for chip catcher and use method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116832505A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117489321A (en) * | 2023-12-29 | 2024-02-02 | 四川派盛通石油工程技术有限公司 | Wellhead chip catcher sledge |
-
2023
- 2023-06-30 CN CN202310812959.4A patent/CN116832505A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117489321A (en) * | 2023-12-29 | 2024-02-02 | 四川派盛通石油工程技术有限公司 | Wellhead chip catcher sledge |
| CN117489321B (en) * | 2023-12-29 | 2024-04-09 | 四川派盛通石油工程技术有限公司 | Wellhead chip catcher sledge |
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| 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 | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20231003 |
|
| WW01 | Invention patent application withdrawn after publication |