CN109372720A - Piston type pneumatic motor vacuum pump - Google Patents
Piston type pneumatic motor vacuum pump Download PDFInfo
- Publication number
- CN109372720A CN109372720A CN201811552881.2A CN201811552881A CN109372720A CN 109372720 A CN109372720 A CN 109372720A CN 201811552881 A CN201811552881 A CN 201811552881A CN 109372720 A CN109372720 A CN 109372720A
- Authority
- CN
- China
- Prior art keywords
- cylinder sleeve
- vacuum
- piston
- vacuum pump
- piston type
- 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
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005457 optimization Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/053—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with an actuating element at the inner ends of the cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B1/00—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements
- F01B1/06—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders in star or fan arrangement
- F01B1/062—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders in star or fan arrangement the connection of the pistons with an actuating or actuated element being at the inner ends of the cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B23/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01B23/08—Adaptations for driving, or combinations with, pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/0404—Details, component parts specially adapted for such pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The present invention provides a kind of piston type pneumatic motor vacuum pumps, comprising: piston type pneumatic motor and vacuum cylinder cap；Several cylinder sleeve bodies of piston type pneumatic motor, annular spread are mounted on crankcase, and vacuum cylinder cap is mounted on the top of cylinder sleeve body cylinder sleeve, in several cylinder sleeve bodies, are had and are equipped with vacuum cylinder cap on one or more cylinder sleeve；On the valve plate of vacuum cylinder cap, intake valve and exhaust valve are installed, air intake control valve is installed on the gas exchanges runner of cylinder sleeve body side surface, gas exhausting valve is installed on the grate flow channel of vacuum cylinder cap；The one or more cylinder sleeve of piston type pneumatic motor carries out vacuumizing work, and air intake control valve is closed, and the gas exhausting valve that vacuum reservoir covers is opened, and gas enters in cylinder sleeve from air inlet runner, is discharged under the reciprocating of piston from grate flow channel.The one or more cylinder sleeve stopping of piston type pneumatic motor vacuumizes work, switches to operating pneumatic, air intake control valve is opened, and the gas exhausting valve that vacuum reservoir covers is closed.
Description
Technical field
The present invention is a kind of piston type pneumatic motor vacuum pump, is related to piston type pneumatic motor and vacuum pump manufacturing technology is led
Domain.
Background technique
Piston type pneumatic motor is the device for the pressure energy of compressed air being converted into the mechanical energy of rotation, its effect phase
When in motor or hydraulic motor, i.e. output torque is rotated with driving mechanism.The internal structure of piston type pneumatic motor
Essentially identical with the internal structure of piston type vacuum pump, existing technology is to drive piston type vacuum pump with piston type pneumatic motor
Work is vacuumized, structure is relative complex；There is presently no a piston type pneumatic motor is utilized, realizes pneumatic outputting torsion and take out
The combined type air motor vacuum pump of vacuum work.
Summary of the invention
The purpose of the present invention is to provide a kind of piston type pneumatic motor vacuum pumps, realize pneumatic outputting torsion and extract true
Sky work.
In view of above-mentioned technical problem, the purpose of the present invention is to provide a kind of piston type pneumatic motor vacuum pumps, comprising: living
Plug air motor and vacuum cylinder cap.Several cylinder sleeve bodies of piston type pneumatic motor, annular spread are mounted on crankcase；Cylinder
In the cylinder sleeve of body, piston is installed.The side of cylinder sleeve body is provided with venthole, which communicates with gas exchanges runner.Very
Empty cylinder cap is mounted on the top of cylinder sleeve body cylinder sleeve, in several cylinder sleeve bodies, has and is equipped on one or more cylinder sleeve very
Empty cylinder cap；On the valve plate of vacuum cylinder cap, intake valve and exhaust valve are installed.Vacuum reservoir, which covers, is equipped with air inlet runner, intake valve
Air inlet communicated with air inlet runner；Vacuum reservoir, which covers, is equipped with grate flow channel, and the gas vent of exhaust valve is communicated with grate flow channel.
Air intake control valve is installed on the gas exchanges runner of cylinder sleeve body side surface, gas exhaust inspecting is installed on the grate flow channel of vacuum cylinder cap
Valve.The one or more cylinder sleeve of piston type pneumatic motor carries out vacuumizing work, and air intake control valve is closed, and vacuum reservoir covers
Gas exhausting valve open, gas enters in cylinder sleeve from air inlet runner, is discharged under the reciprocating of piston from grate flow channel.It is living
The one or more cylinder sleeve stopping of plug air motor vacuumizes work, switches to operating pneumatic, and air intake control valve is opened,
The gas exhausting valve that vacuum reservoir covers is closed.
The present invention is further improved, the optimization technique measure taken is: being equipped with piston on the cylinder sleeve of cylinder sleeve body
Vacuum pump head, the pedestal and cylinder sleeve of the piston vacuum pump head are fixedly mounted, and are provided with tie rod holes on pedestal.The connection of piston vacuum pump head
One end of bar is fixed to each other with the top land in cylinder sleeve, the other end of the connecting rod, the vacuum cock with piston vacuum pump head
It is fixed to each other, which is mounted in tie rod holes.
The present invention is further improved, the optimization technique measure taken is: linear bearing is installed in connecting hole, it should
Linear bearing is mounted on the outside of connecting rod.
The present invention is further improved, the optimization technique measure taken is: sealing element is equipped in connecting hole, this is close
Sealing and the external contact of connecting rod seal, which is mounted on the top of linear bearing.
The present invention is further improved, the optimization technique measure taken is: piston vacuum pump head is true for no oil piston
Empty pump head.
Beneficial effect
Based on above technical scheme, inventive piston formula air motor vacuum pump at least has the advantages that one of them:
1. piston type pneumatic motor vacuum pump realizes piston type pneumatic motor by changing piston type pneumatic motor internal structure
Extraction vacuum work is carried out while operating pneumatic outputting torsion；Need to extract vacuum again to need to work using air motor
Working condition provides most simple and practical technical support；
2. realizing piston type pneumatic motor gas by increasing the technical measures such as vacuum cylinder cap on the cylinder sleeve of piston type pneumatic motor
It starts building to make the free switching with extraction vacuum work；
3. realizing oil-free extraction vacuum work by increasing vacuum pump head on the cylinder sleeve of piston type pneumatic motor.
Detailed description of the invention
Fig. 1 is inventive piston formula air motor vacuum pump operation schematic diagram.
Fig. 2 is invention piston type pneumatic motor vacuum pump using vacuum pump head linkage work schematic diagram.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
One, first embodiment.
As shown in Figure 1, a kind of piston type pneumatic motor vacuum pump, comprising: piston type pneumatic motor 101 and vacuum cylinder cap
201.Several cylinder sleeve bodies 102 of piston type pneumatic motor 101, annular spread are mounted on crankcase 103；Cylinder sleeve body 102
Piston 105 is installed, the side of the cylinder sleeve body 102 is provided with venthole 106, venthole 106 and gas exchanges runner in cylinder sleeve 104
107 communicate；As shown in Figure 1, vacuum cylinder cap 201 is mounted on the top of 102 cylinder sleeve 104 of cylinder sleeve body, in five cylinder sleeve bodies 102, have
Vacuum cylinder cap 201 is installed on two cylinder sleeves 104.On the valve plate 202 of vacuum cylinder cap 201, intake valve 203 and exhaust valve are installed
204；Air inlet runner 205 is installed, the air inlet 206 of intake valve 203 is communicated with air inlet runner 205 on the vacuum cylinder cap 201.Very
Grate flow channel 207 is installed, the gas vent 208 of exhaust valve 204 is communicated with grate flow channel 207 on empty cylinder cap 201.Cylinder sleeve body 102
Air intake control valve 210, the row of being equipped on the grate flow channel 207 of vacuum cylinder cap 201 are installed on the gas exchanges runner 107 of side
Gas control valve 220.As shown in Figure 1, piston type pneumatic motor 101 rotates, the cylinder sleeve 104 for being equipped with vacuum cylinder cap 201 is taken out
Vacuum work, air intake control valve 210 are closed, and the gas exhausting valve 220 on vacuum cylinder cap 201 is opened, and gas is from air inlet runner 205
Into in cylinder sleeve 104, it is discharged under the reciprocating of piston 105 from grate flow channel 207.The cylinder sleeve of piston type pneumatic motor 101
104 stop vacuumizing work, switch to operating pneumatic, and air intake control valve 210 is opened, the gas exhausting valve on vacuum cylinder cap 201
220 close.
So far, inventive piston formula air motor vacuum pump first embodiment, introduction finish.
Two, second embodiments
As shown in Fig. 2, piston vacuum pump head 301 is installed on the cylinder sleeve 104 of cylinder sleeve body 102, the piston vacuum pump head 301
Pedestal 302 and cylinder sleeve 104 are fixedly mounted, and are provided with tie rod holes 303 on pedestal 302.The connecting rod 304 1 of piston vacuum pump head 301
End, and is fixed to each other at the top of the piston 105 in cylinder sleeve 104, and the other end of the connecting rod 304 is true with piston vacuum pump head 301
Empty piston 305 is fixed to each other, which is mounted in tie rod holes 303.Linear bearing 306 is installed in connecting hole 303,
The linear bearing 306 is mounted on the outside of connecting rod 304.Sealing element 307 is installed, the sealing element 307 and company in connecting hole 303
The external contact of extension bar 304 seals, which is mounted on the top of linear bearing 306.Piston vacuum pump head 301 is nothing
Oil piston vacuum pump head 308.
So far, inventive piston formula air motor vacuum pump second embodiment, introduction finish.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, that is made appoints modification, equivalent replacement, improvement etc., should be included in protection of the invention
Within the scope of.
Claims (5)
1. a kind of piston type pneumatic motor vacuum pump characterized by comprising
Piston type pneumatic motor (101), several cylinder sleeve bodies (102), annular spread are mounted on crankcase (103)；It is described
In the cylinder sleeve (104) of cylinder sleeve body (102), piston (105) are installed；The side of the cylinder sleeve body (102) is provided with venthole
(106), the venthole (106) communicates with gas exchanges runner (107)；
Vacuum cylinder cap (201), is mounted on the top of cylinder sleeve body (102) cylinder sleeve (104), in several described cylinder sleeve bodies (102),
Have and vacuum cylinder cap (201) are installed on one or more cylinder sleeve (104)；The valve plate (202) of the vacuum cylinder cap (201)
On, intake valve (203) and exhaust valve (204) are installed；It is equipped with air inlet runner (205) on the vacuum cylinder cap (201), it is described
The air inlet (206) of intake valve (203) is communicated with air inlet runner (205)；Grate flow channel is installed on the vacuum cylinder cap (201)
(207), the gas vent (208) of the exhaust valve (204) is communicated with grate flow channel (207)；The gas of cylinder sleeve body (102) side
It is equipped with air intake control valve (210) in body exchange runner (107), is installed on the grate flow channel (207) of the vacuum cylinder cap (201)
There are gas exhausting valve (220)；Piston type pneumatic motor (101) one or more cylinder sleeve (104) carries out vacuumizing work,
The air intake control valve (210) is closed, and the gas exhausting valve (220) on the vacuum cylinder cap (201) is opened, and gas is from inlet air flow
Road (205) enters in cylinder sleeve (104), is discharged under the reciprocating of piston (105) from grate flow channel (207)；The piston type
Air motor (101) one or more cylinder sleeve (104) stopping vacuumizes work, switches to operating pneumatic, the air inlet
Control valve (210) is opened, and the gas exhausting valve (220) on the vacuum cylinder cap (201) is closed.
2. piston type pneumatic motor vacuum pump according to claim 1, it is characterised in that: the cylinder of the cylinder sleeve body (102)
It is equipped with piston vacuum pump head (301) on set (104), the pedestal (302) of the piston vacuum pump head (301) and cylinder sleeve (104)
It is fixedly mounted, is provided with tie rod holes (303) on the pedestal (302)；The one of piston vacuum pump head (301) connecting rod (304)
It is fixed to each other at the top of end, with the piston (105) in cylinder sleeve (104), the other end of the connecting rod (304), with piston vacuum pump
The vacuum cock (305) of head (301) is fixed to each other；The connecting rod (304) is mounted in tie rod holes (303).
3. piston type pneumatic motor vacuum pump according to claim 2, it is characterised in that: peace in the connecting hole (303)
Equipped with linear bearing (306), the linear bearing (306) is mounted on the outside of connecting rod (304).
4. piston type pneumatic motor vacuum pump according to claim 2, it is characterised in that: peace in the connecting hole (303)
Equipped with sealing element (307), the external contact of the sealing element (307) and connecting rod (304) is sealed, sealing element (307) peace
Mounted in the top of linear bearing (306).
5. piston type pneumatic motor vacuum pump according to claim 3, it is characterised in that: the piston vacuum pump head
It (301) is oil-free piston vacuum pump head (308).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811552881.2A CN109372720A (en) | 2018-12-19 | 2018-12-19 | Piston type pneumatic motor vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811552881.2A CN109372720A (en) | 2018-12-19 | 2018-12-19 | Piston type pneumatic motor vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109372720A true CN109372720A (en) | 2019-02-22 |
Family
ID=65370805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811552881.2A Pending CN109372720A (en) | 2018-12-19 | 2018-12-19 | Piston type pneumatic motor vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109372720A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230585A (en) * | 2019-06-18 | 2019-09-13 | 苏州思维医疗科技有限公司 | Pressure vacuum control pump |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3490683A (en) * | 1968-06-18 | 1970-01-20 | Vilter Manufacturing Corp | Gas compressor |
| CN1288108A (en) * | 1999-09-09 | 2001-03-21 | 三洋电机株式会社 | High pressure compressor |
| CN201027612Y (en) * | 2007-04-10 | 2008-02-27 | 鞍山佳朋压缩机有限公司 | Non-oil lubrication step piston type air compressor |
| CN201165955Y (en) * | 2008-01-25 | 2008-12-17 | 薛建国 | V type oil-free reciprocating vacuum pump |
| CN102094785A (en) * | 2011-03-16 | 2011-06-15 | 卢高 | Miniature piston air pump without oil lubrication |
| CN206738111U (en) * | 2017-05-19 | 2017-12-12 | 重庆安来动力机械有限公司 | Power pneumatics all-in-one |
| CN107676247A (en) * | 2017-11-22 | 2018-02-09 | 浙江洛森压缩机有限公司 | Oilless air compressor air valve structure |
| CN207161282U (en) * | 2017-08-03 | 2018-03-30 | 南通虹登机械设备有限公司 | A kind of inverted Y-shaped oil-free gas compressor |
| CN109026603A (en) * | 2018-08-01 | 2018-12-18 | 威海威高海盛医用设备有限公司 | A kind of new type explosion proof oxygen supercharger |
| CN209385302U (en) * | 2018-12-19 | 2019-09-13 | 李小冬 | Piston type pneumatic motor vacuum pump |
-
2018
- 2018-12-19 CN CN201811552881.2A patent/CN109372720A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3490683A (en) * | 1968-06-18 | 1970-01-20 | Vilter Manufacturing Corp | Gas compressor |
| CN1288108A (en) * | 1999-09-09 | 2001-03-21 | 三洋电机株式会社 | High pressure compressor |
| CN201027612Y (en) * | 2007-04-10 | 2008-02-27 | 鞍山佳朋压缩机有限公司 | Non-oil lubrication step piston type air compressor |
| CN201165955Y (en) * | 2008-01-25 | 2008-12-17 | 薛建国 | V type oil-free reciprocating vacuum pump |
| CN102094785A (en) * | 2011-03-16 | 2011-06-15 | 卢高 | Miniature piston air pump without oil lubrication |
| CN206738111U (en) * | 2017-05-19 | 2017-12-12 | 重庆安来动力机械有限公司 | Power pneumatics all-in-one |
| CN207161282U (en) * | 2017-08-03 | 2018-03-30 | 南通虹登机械设备有限公司 | A kind of inverted Y-shaped oil-free gas compressor |
| CN107676247A (en) * | 2017-11-22 | 2018-02-09 | 浙江洛森压缩机有限公司 | Oilless air compressor air valve structure |
| CN109026603A (en) * | 2018-08-01 | 2018-12-18 | 威海威高海盛医用设备有限公司 | A kind of new type explosion proof oxygen supercharger |
| CN209385302U (en) * | 2018-12-19 | 2019-09-13 | 李小冬 | Piston type pneumatic motor vacuum pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230585A (en) * | 2019-06-18 | 2019-09-13 | 苏州思维医疗科技有限公司 | Pressure vacuum control pump |
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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 | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190222 |
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| WD01 | Invention patent application deemed withdrawn after publication |