CN104556941A - Novel gas extraction hole sealing agent and preparation method thereof - Google Patents
Novel gas extraction hole sealing agent and preparation method thereof Download PDFInfo
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- CN104556941A CN104556941A CN201510002549.9A CN201510002549A CN104556941A CN 104556941 A CN104556941 A CN 104556941A CN 201510002549 A CN201510002549 A CN 201510002549A CN 104556941 A CN104556941 A CN 104556941A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a novel gas extraction hole sealing agent and a preparation method thereof. The novel gas extraction hole sealing agent consists of a hole sealing material and water, wherein the mass ratio of the hole sealing material to the water is 1:(0.35 to 0.8); the hole sealing material comprises the following components in percentage by weight: 25 percent to 45 percent of red mud, 5 percent to 15 percent of steel slag fine powder, 20 percent to 35 percent of calcium aluminate powder, 2 percent to 10 percent of desulphurization gypsum powder, 5 percent to 15 percent of carbide slag, 20 percent to 40 percent of fly ash, 2 percent to 5 percent of a filling compacting agent, 0.4 percent to 1.6 percent of a modifier and 0.2 percent to 1.2 percent of a pipeline conveying modifier. The material has a good expansion effect; the sealing effect and gas extraction efficiency are improved; the number of drilled holes is reduced. According to the invention, a mode of stimulating wastes by wastes is originally adopted, so that when potential activities of the fly ash, the red mud and the steel slag fine powder are sufficiently stimulated, the use volume of water required for mixing is reduced and production cost of the material is reduced; each technical index meets the requirements of the hole sealing material and the novel gas extraction hole sealing agent belongs to a pioneer product in the industry.
Description
Technical field
The invention belongs to industrial and mineral field, particularly the novel gas pumping hole sealing agent of one and preparation method.
Background technology
Gas is the primary technical barrier run in mining process, coal seam underground gas extraction is the effective ways administering coal-bed gas, wherein boring is the basic technology means that coal-bed gas is administered, generally all require to seal boring after pore-forming, the quality of sealing decides the quality of extracting result, as the sealing of hole material of sealing, its quality is particularly important.
The sealing of hole material that present stage China coal seam uses mostly is macromolecular material and sand-cement slurry sealing of hole material, after the former sealing of hole, ultimate compression strength is low, easily deform contraction under terrane stress effect, there are certain toxicity, inflammable, portion of material chance water inefficacy, sealing effectiveness is poor, and price is very high, sealing of hole cost intensive.If the latter is not expanded after solidifying with silicate cement and slightly shunk on the contrary, during water shutoff flat hole, often form a sealing of hole dead zone on the top of boring, boring top fissured zone cannot be filled; If some tiny cracks can be produced with inside during aluminosulfate cement consolidation, material is made to lose airtight effect.
In addition, flyash, red mud are as a kind of conventional hole sealing agent raw material, and the problem of its activity excitation is art technology difficult point always.Flyash is as a kind of volcano grey matter powder with lateral reactivity, and its chemical composition is with SiO
2, Al
2o
3and other metal oxide is main.Because in flyash, the chemically reactive of sial glassy phase is low, namely the three-dimensional space network structural glass body that forms of silico-aluminate is under the effect of alkali, and the depolymerization ability of aggregation agent in network is low.In addition, CaO and SiO in ash
2ratio size also the pozzolanic activity of flyash is played a decisive role.When the calcium oxide content in flyash is higher, there is certain gelling property.Think in theory, flyash supplemental calcium just may aquation, sclerosis and form intensity, practical study and utilization show, only to supplemental calcium in flyash, though can excite the activity of ash, but at normal temperatures and pressures, its intensity particularly early strength is on the low side.And red mud take bauxite as the fines strong basicity solid waste produced in raw material production alumina process, the activity of red mud is mainly from the sintering process in alumina producing flow process.Following main chemical reactions is there is in bauxite, Wingdale and ground caustic in sintering process:
Al
2O
3+Na
2CO
3＝Na
2O·Al
2O
3+CO
2↑
Fe
2O
3+Na
2CO
3＝Na
2O·Fe
2O
3+CO
2↑
SiO
2+2CaO＝2CaO·SiO
2
Go back the mineral such as generating portion tricalcium aluminate, tetracalcium aluminoferrite simultaneously, identical with silicate cement, Dicalcium Phosphate (Feed Grade), tricalcium aluminate, tetracalcium aluminoferrite all belong to hydraulic cement product, but utilize rate variance in existing technique to red mud lateral reactivity, are difficult to give full play to its active effect.
Summary of the invention:
For the problems referred to above, the invention provides a kind of coal bed gas extraction hole sealing agent and preparation method thereof, this material expansion is effective, improves sealing effectiveness and gas drainage efficiency, reduces drilling hole amount.The present invention is originally in the mode that " refuse " excites " refuse " active, utilize the lateral reactivity of red mud, flyash can pass through heating, activate, interpolation activity excitant etc. carries out the characteristic intensified, using carbide slag, desulfurization gypsum powder as activity excitant, coordinate the use of diminishing component again, while fully exciting the lateral reactivity of flyash, red mud, steel-making slag powder, decrease the water consumption required for mix, reduce the production cost of material, and all technical all meets the requirement of sealing material, belong to industry innovation product.
To achieve these goals, the present invention adopts following technical scheme:
A kind of novel gas pumping hole sealing agent, be made up of sealing of hole material and water, the mass ratio of described sealing of hole material and water is 1:0.35 ~ 0.8, each weight percentages of components of described sealing of hole material is as follows: red mud 25% ~ 45%, ground steel slag 5% ~ 15%, calcium aluminate powder 20% ~ 35%, desulfurization gypsum powder 2% ~ 10%, carbide slag 5% ~ 15%, flyash 20% ~ 40%, filling densifying agent 2% ~ 5%, conditioning agent 0.4% ~ 1.6%, Cemented filling modifying agent 0.2% ~ 1.2%, each weight percentages of components sum is 100%.
Preferably, each weight percentages of components of described sealing of hole material is as follows: red mud 25% ~ 40%, ground steel slag 5% ~ 10%, calcium aluminate powder 20% ~ 30%, desulfurization gypsum powder 2% ~ 8%, carbide slag 5% ~ 13%, flyash 25% ~ 30%, filling densifying agent 2% ~ 5%, conditioning agent 0.4% ~ 1.2%, Cemented filling modifying agent 0.5% ~ 1.2%, each weight percentages of components sum is 100%.
Preferably, each weight percentages of components of described sealing of hole material is as follows: red mud 25% ~ 30%, ground steel slag 6% ~ 9%, calcium aluminate powder 20% ~ 22%, desulfurization gypsum powder 2% ~ 3%, carbide slag 8% ~ 10%, flyash 27% ~ 30%, filling densifying agent 3% ~ 5%, conditioning agent 0.4% ~ 0.6%, Cemented filling modifying agent 0.8% ~ 1%, each weight percentages of components sum is 100%.
Preferably, described conditioning agent is selected from two or more the combination any in lithium chloride, Quilonum Retard, Tai-Ace S 150, aluminum oxide clinker.
Preferably, described Cemented filling modifying agent is selected from two or more the combination any in talcum powder, wilkinite, polyacrylamide, water reducer.
Preferably, described water reducer is selected from one in calcium lignin sulphonate, sodium lignosulfonate, naphthalenesulfonate formaldehyde condensation compound pipe water reducer, sulfamate water reducer, polycarboxylate water-reducer, melamine based water reducer or its mixture.
Preferably, the mass ratio of described sealing of hole material and water is 1:0.5 ~ 0.6.
Present invention also offers the preparation method of above-mentioned novel gas pumping hole sealing agent, comprise the steps:
1) by red mud, ground steel slag, calcium aluminate powder, desulfurization gypsum powder, carbide slag, flyash, filling densifying agent, conditioning agent, Cemented filling modifying agent, mix, obtain sealing of hole material,
2) to step 1) sealing of hole material in add water, mix, obtain novel gas pumping hole sealing agent;
The mass ratio of described sealing of hole material and water is 1:0.35 ~ 0.8;
In described sealing of hole material, the weight percent of each component is: red mud 25% ~ 45%, ground steel slag 5% ~ 15%, calcium aluminate powder 20% ~ 35%, desulfurization gypsum powder 2% ~ 10%, carbide slag 5% ~ 15%, flyash 20% ~ 40%, filling densifying agent 2% ~ 5%, conditioning agent 0.4% ~ 1.6%, Cemented filling modifying agent 0.2% ~ 1.2%; Each weight percentages of components sum is 100%.
After novel gas pumping hole sealing agent of the present invention adds water, main hydration reaction is as follows:
SiO
2(activity)+m
1ca (OH)
2+ xH
2o → m
1caOSiO
2xH
2o
Al
2o
3(activity)+m
2ca (OH)
2+ yH2O → m
2caOAl
2o
3yH
2o
2NaAlO
2+3CaO+7H
2O→3CaO·Al
2O
3·6H
2O+2NaOH
3CaO·Al
2O
3·6H
2O+3(CaSO
4·2H
2O)+20H
2O→3CaO·Al
2O
3·3CaSO
4·32H
2O
The effect that the present invention is useful is:
1, water cement ratio is adjustable.During use, water cement ratio regulates by 0.35 ~ 1.0;
2, the presetting period is adjustable.Presetting period 5 ~ 120min, and can adjust according to different service requirementss;
3, fineness is thin.Specific surface area is greater than 600cm
2/ g, has good mobility and fills minute fissure effect;
4, cured body microdilatancy, owing to containing a large amount of ettringite in hydrated product, with certain volumetric expansion after solidification, rate of expansion >=0.03%, leak stopping impermeability is good.
5, extraction needs can be met in the short period after bore closed.When water cement ratio is 0.5, in 2 hours, intensity can reach more than 2MPa, and within one day, intensity can reach more than 3MPa, later strength sustainable growth, several hours can adapter enforcement gas pumping.
6, there is " automatically repairing " function.This sealing of hole material cured body long-term intensity of soaking in water can not reduce, and can continue on the contrary to raise, and the fine crack occurred after pressurized can " selfreparing ".
Embodiment
The present invention will be further elaborated below.Should be noted that following explanation is only to explain the present invention, its content not being limited.
Embodiment 1:
Experimental temperature: normal temperature (21 ~ 25 DEG C)
Experiment equipment: WDW-300E electronic universal tester.
To fill a prescription according to mass ratio: red mud 45%, ground steel slag 5%, calcium aluminate powder 20%, desulfurization gypsum powder 4%, carbide slag 5%, flyash 20%, conditioning agent 0.4%, Cemented filling modifying agent 0.6% are joined and got, according to water cement ratio be 0.6 mix with water after, put into trier and test.Conditioning agent is the mixture of aluminum oxide clinker and lithium chloride 4:1 in mass ratio, and Cemented filling modifying agent is wilkinite, calcium lignin sulphonate mixes with the ratio of 5:1:0.5 with naphthalenesulfonate formaldehyde condensation compound water reducer.
Experimental result is as shown in table 1,
Table 1 coal bed gas extraction hole sealing agent technical indicator
| Time of coagulation (min) | Initial set: | Final set: | |
| 65 | 90 | ||
| Degree of mobilization (25 DEG C) (min) | 3min | 10min | 18min |
| 11s45ms | 12s33ms | 14s55ms | |
| Degree of free swelling (%) | 2h | ||
| 0.04 | |||
| Ultimate compression strength (MPa) | 2h | 1d | 28d |
| 2.12 | 3.66 | 5.88 |
Embodiment 2:
Experimental temperature: normal temperature (21-25 DEG C)
Experiment equipment: WDW-300E electronic universal tester.
To fill a prescription according to mass ratio: red mud 25%, ground steel slag 10%, calcium aluminate powder 20%, desulfurization gypsum powder 4%, carbide slag 9%, flyash 30%, conditioning agent 0.8%, Cemented filling modifying agent 1.2% are joined and got, according to water cement ratio be 0.55 mix with water after, put into trier and test.Wherein, conditioning agent is the mixture of aluminum oxide clinker and lithium chloride 3:1 in mass ratio, and Cemented filling modifying agent is wilkinite, calcium lignin sulphonate mixes with the ratio of 5:1:1 with naphthalenesulfonate formaldehyde condensation compound water reducer.
Experimental result is as shown in table 2,
Table 2 coal bed gas extraction hole sealing agent technical indicator
| Time of coagulation (min) | Initial set: | Final set: | |
| 45 | 65 | ||
| Degree of mobilization (25 DEG C) (min) | 3min | 10min | 18min |
| 10s45ms | 11s21ms | 13s33ms | |
| Degree of free swelling (%) | 2h |
| 0.05 | |||
| Ultimate compression strength (MPa) | 2h | 1d | 28d |
| 2.66 | 4.66 | 7.88 |
Embodiment 3:
Experimental temperature: normal temperature (21-25 DEG C)
Experiment equipment: WDW-300E electronic universal tester.
To fill a prescription according to mass ratio: red mud 30%, ground steel slag 9%, calcium aluminate powder 25%, desulfurization gypsum powder 2%, carbide slag 8%, flyash 25%, conditioning agent 0.4%, Cemented filling modifying agent 0.6% are joined and got, according to water cement ratio be 0.50 mix with water after, put into trier and test.Wherein, conditioning agent is the mixture of aluminum oxide clinker and lithium chloride 4:1 in mass ratio, and Cemented filling modifying agent is wilkinite, polyacrylamide, calcium lignin sulphonate mix with the ratio of 4:0.1:1:0.5 with naphthalenesulfonate formaldehyde condensation compound water reducer.
Experimental result is as shown in table 3:
Table 3 coal bed gas extraction hole sealing agent technical indicator
| Time of coagulation (min) | Initial set: | Final set: | |
| 55 | 75 | ||
| Degree of mobilization (25 DEG C) (min) | 3min | 10min | 18min |
| 11s55ms | 12s43ms | 14s55ms | |
| Degree of free swelling (%) | 2h | ||
| 0.05 | |||
| Ultimate compression strength (MPa) | 2h | 1d | 28d |
| 2.26 | 4.16 | 6.26 |
Embodiment 4:
Experimental temperature: normal temperature (21-25 DEG C)
Experiment equipment: WDW-300E electronic universal tester.
1. raw materials pretreatment: red mud (take from alumina producer discharge refuse) is dried and is levigately worked into more than 200 orders, its chemical composition is chemically examined, will, steel slag grinding fining-off, makes it reach secondary and above standard, and described steel-making slag powder index is as follows.
Table 4 steel-making slag powder index
Carry out chemical analysis to calcium aluminate powder, its concrete composition is: loss on ignition is 0.35%, SiO
2content is 3.56%, Al
2o
3content is 58.68%, Fe
2o
3content is 1.62%, CaO content is 27.72%, content of MgO is 2.08%, SO
3content is 0.85%, the CaOAl in the mineral composition of this calcium aluminate powder
2o
3content is 72%.
By activity excitant---desulfurated plaster and carbide slag, dry and be levigately worked into more than 200 orders.
2. will fill a prescription according to mass ratio: red mud 30%, ground steel slag 10%, calcium aluminate powder 20%, desulfurization gypsum powder 8%, carbide slag 8%, flyash 22%, conditioning agent 0.8%, Cemented filling modifying agent 1.2% are joined and got, according to water cement ratio be 0.55 mix with water after, put into trier and test.Wherein, conditioning agent is the mixture of aluminum oxide clinker and lithium chloride 3:1 in mass ratio, and Cemented filling modifying agent is wilkinite, calcium lignin sulphonate mixes with the ratio of 5:1:1 with naphthalenesulfonate formaldehyde condensation compound water reducer.
Table 4 coal bed gas extraction hole sealing agent technical indicator
| Time of coagulation (min) | Initial set: | Final set: | |
| 68 | 91 | ||
| Degree of mobilization (25 DEG C) (min) | 3min | 11min | 19min |
| 11s44ms | 12s35ms | 14s56ms | |
| Degree of free swelling (%) | 2h | ||
| 0.05 | |||
| Ultimate compression strength (MPa) | 2h | 1d | 28d |
| 2.11 | 3.64 | 5.86 |
In conjunction with above-mentioned experiment, this hole sealing agent take various industrial waste residues as main raw material, mixing multiple additives forms, belong to pioneering in this area, the present invention collects the advantage of polyurethane class high molecular material and Portland cement material and overcomes both shortcoming, there is microdilatancy, not dry and cracked, high workability, high fillibility, presetting period can be in harmonious proportion the fast feature of setting time, good fluidity can infiltrate rapidly borehole circumference crack, fully combine with it under prolonged expansion stress, there is good sealing of hole sealing effectiveness, it is a kind of comparatively ideal coal bed gas drainage discharge drilling sealing material.In above-described embodiment, the technical indicator of gas pumping sealing of hole material is as follows:
1, fineness: specific surface area must not be less than 350 ㎡/㎏; Fineness 0.080 ㎜ square hole sieve screen over-size must not more than 5%.
2, ultimate compression strength: various water cement ratio range product ultimate compression strength must not lower than table 5 set quota.
The ultimate compression strength that this product Different Water-Cement Ratio of table 5 is corresponding
Rate of expansion: product of the present invention 7 days degree of free swelling are greater than 0.03%.
The know-why of gas pumping hole sealing agent provided by the invention and inspection after construction index.
The main component of carbide slag is Ca (OH)
2, the main component of desulfurated plaster is CaSO
4, the SiO containing lateral reactivity in flyash
2and Al
2o
3exciting by the two, active mineral can aquation completely; All containing a large amount of β-C2S and C in red mud and steel-making slag powder
3aH
6deng mineral hydraulic, after adding carbide slag and desulfurated plaster, the hydration reaction of mineral hydraulic can be accelerated, generate gel of calcium silicate and ettringite etc.; In addition owing to adding calcium aluminate powder, in the crystal of effective mineral constituent CA wherein calcium aluminium coordination very irregular, hydration reaction is very fast, the hydrate that some arrange well-crystallized can be obtained after calcium aluminate powder and water react, various hydrate is staggered seeks connections with, overlapping combination, forming hard crystal, is the main source of this product early strength.Originally product inspection data is issued a statement as table 6
Table 6 product inspection data
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (8)
1. a novel gas pumping hole sealing agent, be made up of sealing of hole material and water, it is characterized in that, the mass ratio of described sealing of hole material and water is 1:0.35 ~ 0.8, each weight percentages of components of described sealing of hole material is as follows: red mud 25% ~ 45%, ground steel slag 5% ~ 15%, calcium aluminate powder 20% ~ 35%, desulfurization gypsum powder 2% ~ 10%, carbide slag 5% ~ 15%, flyash 20% ~ 40%, filling densifying agent 2% ~ 5%, conditioning agent 0.4% ~ 1.6%, Cemented filling modifying agent 0.2% ~ 1.2%, each weight percentages of components sum is 100%.
2. novel gas pumping hole sealing agent as claimed in claim 1, it is characterized in that, each weight percentages of components of described sealing of hole material is as follows: red mud 25% ~ 40%, ground steel slag 5% ~ 10%, calcium aluminate powder 20% ~ 30%, desulfurization gypsum powder 2% ~ 8%, carbide slag 5% ~ 13%, flyash 25% ~ 30%, filling densifying agent 2% ~ 5%, conditioning agent 0.4% ~ 1.2%, Cemented filling modifying agent 0.5% ~ 1.2%, each weight percentages of components sum is 100%.
3. novel gas pumping hole sealing agent as claimed in claim 1, it is characterized in that, each weight percentages of components of described sealing of hole material is as follows: red mud 25% ~ 30%, ground steel slag 6% ~ 9%, calcium aluminate powder 20% ~ 22%, desulfurization gypsum powder 2% ~ 3%, carbide slag 8% ~ 10%, flyash 27% ~ 30%, filling densifying agent 3% ~ 5%, conditioning agent 0.4% ~ 0.6%, Cemented filling modifying agent 0.8% ~ 1%, each weight percentages of components sum is 100%.
4. novel gas pumping hole sealing agent as claimed in claim 1, is characterized in that, described conditioning agent is selected from two or more the combination any in lithium chloride, Quilonum Retard, Tai-Ace S 150, aluminum oxide clinker.
5. novel gas pumping hole sealing agent as claimed in claim 1, is characterized in that, described Cemented filling modifying agent is selected from two or more the combination any in talcum powder, wilkinite, polyacrylamide, water reducer.
6. novel gas pumping hole sealing agent as claimed in claim 5, it is characterized in that, described water reducer is selected from one in calcium lignin sulphonate, sodium lignosulfonate, naphthalenesulfonate formaldehyde condensation compound pipe water reducer, sulfamate water reducer, polycarboxylate water-reducer, melamine based water reducer or its mixture.
7. novel gas pumping hole sealing agent as claimed in claim 1, is characterized in that, the mass ratio of described sealing of hole material and water is 1:0.5 ~ 0.6.
8. a preparation method for novel gas pumping hole sealing agent, is characterized in that, comprise the steps:
1) get red mud, ground steel slag, calcium aluminate powder, desulfurization gypsum powder, carbide slag, flyash, filling densifying agent, conditioning agent, Cemented filling modifying agent mix by a certain percentage, obtain sealing of hole material,
2) to step 1) sealing of hole material in add water, mix, obtain novel gas pumping hole sealing agent;
The mass ratio of described sealing of hole material and water is 1:0.35 ~ 0.8;
In described sealing of hole material, the weight percent of each component is: red mud 25% ~ 45%, ground steel slag 5% ~ 15%, calcium aluminate powder 20% ~ 35%, desulfurization gypsum powder 2% ~ 10%, carbide slag 5% ~ 15%, flyash 20% ~ 40%, filling densifying agent 2% ~ 5%, conditioning agent 0.4% ~ 1.6%, Cemented filling modifying agent 0.2% ~ 1.2%; Each weight percentages of components sum is 100%.
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113636789A (en) * | 2021-07-16 | 2021-11-12 | 晋城市格润科技有限公司 | Coal mine underground gas extraction hole sealing material and preparation method thereof |
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| CN102491664A (en) * | 2011-11-24 | 2012-06-13 | 上海宝田新型建材有限公司 | Modified steel slag composite admixture and preparation method thereof |
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2015
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| DE2739275A1 (en) * | 1976-08-31 | 1978-03-02 | Denki Kagaku Kogyo Kk | Fire resistant mouldings or panels with high strength - made from mixt. of gypsum and calcium aluminate |
| CN102491664A (en) * | 2011-11-24 | 2012-06-13 | 上海宝田新型建材有限公司 | Modified steel slag composite admixture and preparation method thereof |
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| CN113636789A (en) * | 2021-07-16 | 2021-11-12 | 晋城市格润科技有限公司 | Coal mine underground gas extraction hole sealing material and preparation method thereof |
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Inventor after: Zhang Guoyu Inventor after: Wang Qinghua Inventor after: Liu Le Inventor after: Zhang Shengmin Inventor after: Liu Min Inventor after: Shen Guangdi Inventor after: Chen Yingqiang Inventor after: Liu Yuming Inventor after: Lv Xueqiang Inventor after: Wang Fengjiang Inventor after: Wang Guojun Inventor after: An Bochao Inventor after: Li Jinshan Inventor after: Yan Fu Inventor after: Lin Yixiao Inventor after: Wang Chuanqi Inventor after: Yu Xiangkun Inventor after: Gao Linhai Inventor before: Zhang Guoyu Inventor before: Liu Le Inventor before: Zhang Shengmin Inventor before: Liu Min Inventor before: Shen Guangdi Inventor before: Chen Yingqiang Inventor before: Liu Yuming Inventor before: Lv Xueqiang Inventor before: Wang Fengjiang Inventor before: Wang Guojun Inventor before: An Bochao Inventor before: Li Jinshan Inventor before: Lin Yixiao Inventor before: Wang Chuanqi Inventor before: Yu Xiangkun Inventor before: Gao Linhai Inventor before: Wang Qinghua |
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| CB03 | Change of inventor or designer information |
Inventor after: Zhang Guoyu Inventor after: Gao Linhai Inventor after: Wang Qinghua Inventor after: Liu Le Inventor after: Zhang Shengmin Inventor after: Liu Min Inventor after: Shen Guangdi Inventor after: Chen Yingqiang Inventor after: Liu Yuming Inventor after: Lv Xueqiang Inventor after: Wang Fengjiang Inventor after: Wang Guojun Inventor after: An Bochao Inventor after: Che Fuli Inventor after: Li Jinshan Inventor after: Yan Fu Inventor after: Lin Yixiao Inventor after: Wang Chuanqi Inventor after: Yu Xiangkun Inventor before: Zhang Guoyu Inventor before: Wang Qinghua Inventor before: Liu Le Inventor before: Zhang Shengmin Inventor before: Liu Min Inventor before: Shen Guangdi Inventor before: Chen Yingqiang Inventor before: Liu Yuming Inventor before: Lv Xueqiang Inventor before: Wang Fengjiang Inventor before: Wang Guojun Inventor before: An Bochao Inventor before: Li Jinshan Inventor before: Yan Fu Inventor before: Lin Yixiao Inventor before: Wang Chuanqi Inventor before: Yu Xiangkun Inventor before: Gao Linhai |