CN207181342U - A kind of Mixed Gases Explosion on-site testing device - Google Patents
A kind of Mixed Gases Explosion on-site testing device Download PDFInfo
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- CN207181342U CN207181342U CN201721183622.8U CN201721183622U CN207181342U CN 207181342 U CN207181342 U CN 207181342U CN 201721183622 U CN201721183622 U CN 201721183622U CN 207181342 U CN207181342 U CN 207181342U
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Abstract
It the utility model is related to a kind of Mixed Gases Explosion on-site testing device, sampling flexible pipe passes sequentially through explosion-proof sampling pump, spark arrester I, blocked valve I is connected with the one end for the cavity that explodes, the other end of blast cavity is connected with spark arrester II and rupture disk successively by an interface of multiplex roles crossover flange, another interface of multiplex roles crossover flange is connected by blocked valve II with spark arrester III, high-speed data acquisition memory module is connected with the high-speed pressure transducer and high-speed temperature sensors being arranged in explosion chamber body respectively by high-speed pressure transducer and high-speed temperature sensors, remote wireless control can be achieved by wireless data communication module I and wireless data communication module II in intelligent control and data acquisition and analysis system, multichannel drive module is connected with the platinum ignition wire being arranged in explosion chamber body.The utility model can be used for explosive gas atmosphere scene, and the automatic gas sampling of live mixed gas and explosive test judgement can be achieved.
Description
Technical field
Flammable gas explosion testing field is the utility model is related to, more particularly to a kind of Mixed Gases Explosion scene is surveyed
Trial assembly is put.
Background technology
In recent years, dangerous material fire explosion in China's is multiple, consequence is serious, is brought for fire brigade's emergency management and rescue disposal
The problem of new and challenge, the inflammable and explosive mixed-gas environment detection of multicomponent especially unknown to scene and blast sex determination are outstanding
To be important.
More compared with concentration sensing modality with explosion limit scope is judged at present, is lacked field portable and is quickly exploded
Sexual orientation determines device.
At present, the experimental provision both at home and abroad on burning mixture blast sex determination is divided into tubular type method of testing and ball is surveyed
Examination method（5L、12L、20l、1m3）, relevant criterion include GB/T 12474-2008, GB/T 21844-2008, EN 1839, ASTM
E681, DIN51649 etc..In the world using the blast pole of gas under four kinds of different experimental provisions and method measure atmospheric pressure
Limit.Above-mentioned experimental facilities is laboratory instrumentation, does not possess live quick explosive analysis and judges；And fuel gas is quick-fried
Fried decision procedure is range estimation directly observation, does not possess a variety of quantitative judgements of blast pressure and flame temperature.Meanwhile existing gas
There are numerous uncertainties in the concentration sensor of body explosion environment, alarm threshold value is surveyed with laboratory for unknown multi-component judgement
On the basis of determining explosion limit, gaseity is mixed there is some difference property with scene.
The content of the invention
To overcome above-mentioned problems of the prior art, the utility model provides a kind of Mixed Gases Explosion scene and surveyed
Trial assembly is put, available for automatic sampling of the explosive gas atmosphere scene to unknown Mixed Gases Explosion and quick test judgement.
The device employs superhigh temperature platinum thermal ignition mode, with the dual explosive criterion of pressure change and temperature change, realizes existing
The automatic gas sampling of field mixed gas and explosive test judgement.
To achieve the above object, used concrete technical scheme is the utility model：A kind of Mixed Gases Explosion shows
Field test device, it is characterised in that：Including the automatic sampling system, blast cavity and back-fire relief pressure release being arranged in portable casing
System, superhigh temperature ignition system, intelligent control and data acquisition and analysis system, power supply；
The automatic sampling system includes sampling flexible pipe, explosion-proof sampling pump, spark arrester I, blocked valve I；
Described blast cavity and back-fire relief pressure relief system include blast cavity, multiplex roles crossover flange, blocked valve II, back-fire relief
Device II, spark arrester III, rupture disk, the blast cavity is hollow tubular body or orbicule or tank-like body；
The superhigh temperature ignition system is platinum ignition wire, and the platinum ignition wire is installed in explosion chamber body；
Described intelligent control and data acquisition and analysis system include mixed-signal processor, high-speed data acquisition storage mould
Block, touch-screen colour liquid crystal display device, wireless data communication module I, wireless data communication module II, multichannel drive module, height
Ram compression force snesor and high-speed temperature sensors；
The portable casing is rectangle, is made up of chamber and case lid, and chamber and case lid are by hinge connection, portable casing
Using light aluminum alloy material；
The side of the air-breathing interface of the explosion-proof sampling pump through chamber is guided to outside portable casing, samples the outlet of flexible pipe
Mouth is connected with the air-breathing interface of explosion-proof sampling pump, and the air inlet for sampling flexible pipe guides to the live mixed gas of scene suction, explosion-proof to adopt
The exhaust port of sample pump is connected by spark arrester I with the one end of blocked valve I, and one end of the other end and blast cavity of blocked valve I connects
Connect, the other end of the cavity that explodes installation multiplex roles crossover flange, an interface of multiplex roles crossover flange by spark arrester II with
Rupture disk is connected, and the automatic back-fire relief of superpressure for the cavity that explodes is released, and another interface of multiplex roles crossover flange passes through blocking
Valve II is connected with spark arrester III, and the controlled back-fire relief for the cavity that explodes is released；
The high-speed pressure transducer and high-speed temperature sensors are separately mounted to the outside of blast cavity, with high speed pressure
The pressure sensor probe of sensor connection is arranged on side wall in explosion chamber body, the TEMP being connected with high-speed temperature sensors
Device probe is arranged on the pressure and temperature letter among side wall, being respectively intended to gather in platinum ignition wire and explosion chamber body in explosion chamber body
Number；
The mixed-signal processor respectively with high-speed data acquisition memory module, touch-screen colour liquid crystal display device, nothing
Line data communication module I connects with multichannel drive module, and the high-speed data acquisition memory module senses with high speed pressure respectively
Device, high-speed temperature sensors connection, wireless data communication module II are connected with the terminal of remote control center, wireless data communication
Module I and wireless data communication module II can be achieved data and be wirelessly transferred, and intelligent control and data acquisition and analysis system pass through nothing
Remote wireless control, the multichannel drive module and superelevation can be achieved in line data communication module I and wireless data communication module II
The platinum ignition wire connection of warm ignition system；
Power supply is that intelligent control and data acquisition and analysis system are powered.
The beneficial effects of the utility model are：The utility model can be used for explosive gas atmosphere scene, can be achieved to not
Know the automatic sampling of Mixed Gases Explosion and quick test judgement.
The utility model determines whether to have explosivity different from laboratory tradition visual observations flame propagation state, adopts
With maximum explosion pressure in explosion chamber body and maximum temperature and the initial pressure P0 or initial temperature T0 at initial ignition moment change
Change amount carrys out quick, intelligent judgement, improves the objectivity of determination data, reduces the error that artificial range estimation judges.
The utility model directly judges the explosivity of mixed gas using scene igniting test, with measure mixed gas at present
Combustible component concentration is explosive different relatively to judge from experimental determination explosible limit concentration, and present apparatus test gas sample is existing
Collection mixing gas sample, test result more objective reality, reduce the error of unknown multicomponent mixture strength measure and not true
It is qualitative.
The kPa of pressure detecting resolution ratio 0.1, detection speed≤200us in the utility model explosion chamber body；Temperature detection essence
0.1 DEG C of degree, detection speed≤200us, can be achieved high speed and precision pressure and two kinds of explosive Judging index of high-speed flame temperature are fast
Speed measure, improve the accuracy of explosion phenomenon judgement.
The utility model device realizes that data are wirelessly transferred and separate men from machines, and securely and reliably, stable performance is easy to operate.
The utility model is for live security area, evacuation Division, emergency rescue device disposal, urban pipe network construction maintenance
Fire operation etc. have important practical significance, can improve fire-fighting to take further Disposal Measures to provide scientific basis and rescue
Help the ability of personnel on site's disposal.
The utility model also provides a kind of new explosion phenomenon decision method for other explosive tests.
Brief description of the drawings
Fig. 1 is system structure diagram of the present utility model.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only used for explaining this
Utility model, it is not used to limit the utility model.
As shown in figure 1, a kind of Mixed Gases Explosion on-site testing device, including be arranged in portable casing 6 from
Dynamic sampling system 1, blast cavity and back-fire relief pressure relief system 2, superhigh temperature ignition system 3, intelligent control and data collection and analysis system
System 4, power supply 5.
Automatic sampling system 1 includes sampling flexible pipe 1-1, explosion-proof sampling pump 1-2, the 1-3 of spark arrester I, the 1-4 of blocked valve I.
Explode cavity and back-fire relief pressure relief system 2 include blast cavity 2-1, multiplex roles crossover flange 2-2, the 2-5 of blocked valve II,
The 2-3 of spark arrester II, the 2-6 of spark arrester III, rupture disk 2-4, blast cavity 2-1 is hollow tubular body or orbicule or tank-like body.
Superhigh temperature ignition system 3 is platinum ignition wire 3-1, and platinum ignition wire 3-1 is installed in blast cavity 2-1.
Intelligent control and data acquisition and analysis system 4 include mixed-signal processor 4-1, high-speed data acquisition memory module
4-2, touch-screen colour liquid crystal display device 4-3, wireless data communication module I 4-4, the 4-5 of wireless data communication module II, multichannel are driven
Dynamic model block 4-6, high-speed pressure transducer 4-7 and high-speed temperature sensors 4-8.
Portable casing 6 is rectangle, is made up of chamber and case lid, and chamber and case lid are adopted by hinge connection, portable casing 6
With light aluminum alloy material.
The side of explosion-proof sampling pump 1-2 air-breathing interface 1-21 through chamber is guided to outside portable casing 6, samples flexible pipe
1-1 gas outlet is connected with explosion-proof sampling pump 1-2 air-breathing interface 1-21, and sampling flexible pipe 1-1 air inlet guides to live suction
Live mixed gas, explosion-proof sampling pump 1-2 exhaust port 1-22 are connected by the 1-3 of spark arrester I with the 1-4 one end of blocked valve I, resistance
The disconnected 1-4 of valve I other end is connected with the one end for the cavity 2-1 that explodes, blast cavity 2-1 other end installation multiplex roles crossover flange
2-2, multiplex roles crossover flange 2-2 an interface are connected by the 2-3 of spark arrester II with rupture disk 2-4, for the cavity 2-1 that explodes
The automatic back-fire relief of superpressure release, multiplex roles crossover flange 2-2 another interface passes through the 2-5 of blocked valve II and the 2-6 of spark arrester III
Connection, the controlled back-fire relief for the cavity 2-1 that explodes are released.
High-speed pressure transducer 4-7 and high-speed temperature sensors 4-8 is separately mounted to blast cavity 2-1 outside, with height
The pressure sensor probe 4-71 of ram compression force snesor 4-7 connections is arranged on blast cavity 2-1 madial walls, is sensed with high-speed temperature
The temperature sensor probe 4-81 of device 4-8 connections is arranged among platinum ignition wire 3-1 and blast cavity 2-1 madial walls, is used respectively
To gather the pressure and temperature signal in blast cavity 2-1.
Mixed-signal processor 4-1 respectively with high-speed data acquisition memory module 4-2, touch-screen colour liquid crystal display device 4-
3rd, wireless data communication module I 4-4 connects with multichannel drive module 4-6, high-speed data acquisition memory module 4-2 respectively with a high speed
The terminal of pressure sensor 4-7, high-speed temperature sensors 4-8 connections, the 4-5 of wireless data communication module II and remote control center
Connection, wireless data communication module I 4-4 and the 4-5 of wireless data communication module II can realize that data are wirelessly transferred, intelligent control and
Data acquisition and analysis system 4 can realize long-range nothing by wireless data communication module I 4-4 and the 4-5 of wireless data communication module II
Line traffic control, the multichannel drive module 4-6 are connected with the platinum ignition wire 3-1 of superhigh temperature ignition system 3.
Power supply 5 is charged lithium cells group 5-1, and charged lithium cells group 5-1 can be charged or passed through adapter by vehicle power
Charged by the 50Hz electric power systems of AV220V ± 20%, power supply 5 is that intelligent control and data acquisition and analysis system 4 are powered.
A kind of assay method of Mixed Gases Explosion on-site testing device, step are as follows：
The first step, portable casing 6 is arranged on to the detection zone at the mixed-gas environment scene for needing to determine, will be sampled soft
Pipe 1-1 air inlet guides to scene and sucks live mixed gas, opens case lid, turns on the power 5, self-check of device, self-test is normally touched
Touch screen colour liquid crystal display device 4-3 and show main menu, if device is faulty, show abort situation, now close power supply 5, ginseng
Book carries out troubleshooting as directed, then reopens power supply 5, until self-test is normal and shows main menu.
Bis- Walk, start test, intelligent control and data collection and analysis system by operating touch screen colour liquid crystal display device 4-3
Initial pressure P in 4 automatic data collections of uniting blast cavity 2-10With initial temperature T0Afterwards, intelligent control and data collection and analysis system
The mixed-signal processor 4-1 control multichannel drive module 4-6 driving platinum ignition wire 3-1 igniting of system 4, performs primary blank igniting
Action, intelligent control and the automatic data collection of data acquisition and analysis system 4 are simultaneously exploded in cavity 2-1 during catching blank firing action
Maximum pressure value PMAXWith maximum temperature value TMAX, calculate pressure change caused by platinum ignition wire 3-1 ignition energies most
Big value △ PKBWith the maximum △ T of temperature changeKB
△PKB=PMAX-P0
△TKB=TMAX-T0。
The mixed-signal processor 4-1 control multichannel drive modules of tri- Walk, intelligent control and data acquisition and analysis system 4
4-6, the 1-4 of the blocked valve I and 2-5 of blocked valve II is opened, and start explosion-proof sampling pump 1-2, sampling flexible pipe 1-1 inlet end collections are existing
Gaseous mixture, gaseous mixture pass sequentially through explosion-proof sampling pump 1-2 air-breathing interface 1-21, exhaust port 1-22, the 1-3 of spark arrester I and
The 1-4 of blocked valve I is injected into blast cavity 2-1, while is collection in worksite by the original gas displacement exploded in cavity 2-1
Mixed gas realizes automatic sampling, and the original gas to explode in cavity 2-1 passes sequentially through the 2-5 of blocked valve II and the 2-6 of spark arrester III
Safety relief is to outside device；
After the completion of sampling, the mixed-signal processor 4-1 control multichannel drivings of intelligent control and data acquisition and analysis system 4
Module 4-6, it is automatic to close the 1-4 of blocked valve I, the 2-5 of blocked valve II and explosion-proof sampling pump 1-2, cut-out blast cavity 2-1 and outer chains
Connect.
Initial pressure P in 4th step, intelligent control and the automatic data collection of data acquisition and analysis system 4 blast cavity 2-10With
Initial temperature T0 Then, the mixed-signal processor 4-1 of intelligent control and data acquisition and analysis system 4 controls multichannel drive module
4-6 driving platinum ignition wire 3-1 igniting, igniting test, platinum ignition wire 3-1 are carried out to the live mixed gas in blast cavity 2-1
The surface temperature of ignition point is up to 1500 DEG C, mixed gas that can be in reliable ignition explosion chamber body, while starts high speed number
According to collection memory module 4-2, pass through high-speed pressure transducer 4-7 pressure sensors probe 4-71 and high-speed temperature sensors 4-8
Temperature sensor probe 4-81 is to the continuous Quick Acquisition of pressure and temperature in blast cavity 2-1 and recorded data file, point
After the completion of fire, the pressure and temperature data gathered during igniting are analyzed by intelligent control and data analysis system 4, obtained
To the maximum pressure value P during igniting in explosion chamber body 2-1MAXWith maximum temperature value TMAX , calculate platinum igniting test
The maximum △ P of period pressure changeCSWith the maximum △ T of temperature changeCS
△PCS=PMAX-P0
△TCS=TMAX-T0
According to explosive criterion：△PCS＞ △ PKB+PZOr
△TCS＞ △ TKB+TZ
PZ:The pressure value determined for integrated environment factor,
PZ:The temperature value determined for integrated environment factor,
Whether as explosive gas, automatic decision are explosive mixed gas, pass through touch screen colour liquid crystal display device 4-3
Test result is shown, meanwhile, carried out by the pressure-time curve during showing igniting and temperature-time curve at visualization
Reason, it is directly perceived to reflect in blast cavity 2-1 whether explode；
The multiplex roles crossover flange 2-2 of back-fire relief pressure relief system is two pressure release passages including two interfaces, and multiplex roles are changed
A flange 2-2 pressure release passage is to realize that blast cavity 2-1 superpressure hinders automatically by the 2-3 of spark arrester II and rupture disk 2-4
Fire is released, when pressure exceedes rupture disk 2-4 fracture pressure in the cavity 2-1 that explodes, rupture disk 2-4 ruptures, and blast cavity 2-1
Interior pressure prevents the cavity 2-1 crack damages that explode, another pressure release passage is to pass through resistance by the 2-3 safety reliefs of spark arrester II
The disconnected 2-5 of valve II and the 2-6 of spark arrester III realize that blast cavity 2-1 controlled back-fire relief is released, after the completion of igniting test, intelligent control and
Data acquisition and analysis system 4 by blast cavity 2-1 inside temperature and pressure carry out analysis after automatically control multichannel
Drive module 4-6 opens the 2-5 of blocked valve II, and pressure in blast cavity 2-1 is passed through into the 2-6 safety reliefs of spark arrester III.
5th step, after the residual gas to explode in cavity 2-1 carries out safety relief disposal, equipment returns to original state.
Data can be achieved between wireless data communication module I 4-4 and the 4-5 of wireless data communication module II to be wirelessly transferred, and
WLAN is not needed to support, wireless data communication module I 4-4 is connected with intelligent control and data acquisition and analysis system 4, nothing
The terminal of the 4-5 of line data communication module II and remote control center connects, and intelligent control and data acquisition and analysis system 4 pass through nothing
The 4-4 of line data communication module I and the 4-5 of wireless data communication module II can realize remote wireless control, and test data is wireless
Upload to the terminal of remote control center.
Claims (2)
- A kind of 1. Mixed Gases Explosion on-site testing device, it is characterised in that：Including being arranged on portable casing（6）It is interior from Dynamic sampling system（1）, blast cavity and back-fire relief pressure relief system（2）, superhigh temperature ignition system（3）, intelligent control and data acquisition Analysis system（4）, power supply（5）；The automatic sampling system（1）Including sampling flexible pipe（1-1）, explosion-proof sampling pump（1-2）, spark arrester I（1-3）, blocked valve I （1-4）；Described blast cavity and back-fire relief pressure relief system（2）Including the cavity that explodes（2-1）, multiplex roles crossover flange（2-2）, block Valve II（2-5）, spark arrester II（2-3）, spark arrester III（2-6）, rupture disk（2-4）, the blast cavity（2-1）For hollow pipe Shape body or orbicule or tank-like body；The superhigh temperature ignition system（3）For platinum ignition wire（3-1）, the platinum ignition wire（3-1）It is installed on blast cavity（2-1） It is interior；Described intelligent control and data acquisition and analysis system（4）Including mixed-signal processor（4-1）, high-speed data acquisition deposits Store up module（4-2）, touch-screen colour liquid crystal display device（4-3）, wireless data communication module I（4-4）, wireless data communication module Ⅱ（4-5）, multichannel drive module（4-6）, high-speed pressure transducer（4-7）And high-speed temperature sensors（4-8）；The portable casing（6）For rectangle, it is made up of chamber and case lid, chamber and case lid are by hinge connection, portable casing （6）Using light aluminum alloy material；The explosion-proof sampling pump（1-2）Air-breathing interface（1-21）Portable casing is guided to through the side of chamber（6）Outside, sample Flexible pipe（1-1）Gas outlet and explosion-proof sampling pump（1-2）Air-breathing interface（1-21）Connection, sample flexible pipe（1-1）Air inlet Guide to scene and suck live mixed gas, explosion-proof sampling pump（1-2）Exhaust port（1-22）Pass through spark arrester I（1-3）With resistance Disconnected valve I（1-4）One end connects, blocked valve I（1-4）The other end with blast cavity（2-1）One end connection, explode cavity（2- 1）The other end installation multiplex roles crossover flange（2-2）, multiplex roles crossover flange（2-2）An interface pass through spark arrester II （2-3）With rupture disk（2-4）Connection, for the cavity that explodes（2-1）The automatic back-fire relief of superpressure release, multiplex roles crossover flange（2- 2）Another interface pass through blocked valve II（2-5）With spark arrester III（2-6）Connection, for the cavity that explodes（2-1）Controlled resistance Fire is released；The high-speed pressure transducer（4-7）And high-speed temperature sensors（4-8）It is separately mounted to the cavity that explodes（2-1）It is outer Face, with high-speed pressure transducer（4-7）The pressure sensor probe of connection（4-71）It is arranged on blast cavity（2-1）Madial wall, With high-speed temperature sensors（4-8）The temperature sensor probe of connection（4-81）It is arranged on platinum ignition wire（3-1）With blast cavity （2-1）Among madial wall, collection blast cavity is respectively intended to（2-1）Interior pressure and temperature signal；The mixed-signal processor（4-1）Respectively with high-speed data acquisition memory module（4-2）, touch-screen Color Liquid Crystal Display Device（4-3）, wireless data communication module I（4-4）With multichannel drive module（4-6）Connection, the high-speed data acquisition store mould Block（4-2）Respectively with high-speed pressure transducer（4-7）, high-speed temperature sensors（4-8）Connection, wireless data communication module II （4-5）It is connected with the terminal of remote control center, wireless data communication module I（4-4）With wireless data communication module II（4-5） Achievable data are wirelessly transferred, intelligent control and data acquisition and analysis system（4）Pass through wireless data communication module I（4-4）With Wireless data communication module II（4-5）Remote wireless control, the multichannel drive module can be achieved（4-6）Lighted a fire with superhigh temperature and be System（3）Platinum ignition wire（3-1）Connection；Power supply（5）For intelligent control and data acquisition and analysis system（4）Power supply.
- A kind of 2. Mixed Gases Explosion on-site testing device according to claim 1, it is characterised in that：The power supply （5）For charged lithium cells group（5-1）, charged lithium cells group（5-1）Can by vehicle power charge or by adapter by The 50Hz electric power systems of AV220V ± 20% charge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721183622.8U CN207181342U (en) | 2017-09-15 | 2017-09-15 | A kind of Mixed Gases Explosion on-site testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721183622.8U CN207181342U (en) | 2017-09-15 | 2017-09-15 | A kind of Mixed Gases Explosion on-site testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207181342U true CN207181342U (en) | 2018-04-03 |
Family
ID=61746446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721183622.8U Withdrawn - After Issue CN207181342U (en) | 2017-09-15 | 2017-09-15 | A kind of Mixed Gases Explosion on-site testing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN207181342U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449799A (en) * | 2017-09-15 | 2017-12-08 | 公安部天津消防研究所 | A kind of Mixed Gases Explosion on-site testing device and assay method |
| CN112002857A (en) * | 2020-07-14 | 2020-11-27 | 华瑞矿业科技有限公司 | Explosion-proof battery |
-
2017
- 2017-09-15 CN CN201721183622.8U patent/CN207181342U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449799A (en) * | 2017-09-15 | 2017-12-08 | 公安部天津消防研究所 | A kind of Mixed Gases Explosion on-site testing device and assay method |
| CN107449799B (en) * | 2017-09-15 | 2018-07-13 | 公安部天津消防研究所 | A kind of Mixed Gases Explosion on-site testing device and assay method |
| CN112002857A (en) * | 2020-07-14 | 2020-11-27 | 华瑞矿业科技有限公司 | Explosion-proof battery |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180403 Effective date of abandoning: 20180713 |