CN201901365U - Tank needing cooling and heating and jacket thereof - Google Patents
Tank needing cooling and heating and jacket thereof Download PDFInfo
- Publication number
- CN201901365U CN201901365U CN2010205301784U CN201020530178U CN201901365U CN 201901365 U CN201901365 U CN 201901365U CN 2010205301784 U CN2010205301784 U CN 2010205301784U CN 201020530178 U CN201020530178 U CN 201020530178U CN 201901365 U CN201901365 U CN 201901365U
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- China
- Prior art keywords
- chuck
- pipe
- tank body
- cylindrical shell
- inlet pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001816 cooling Methods 0.000 title abstract description 22
- 238000010438 heat treatment Methods 0.000 title abstract description 22
- 230000008676 import Effects 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000712 assembly Effects 0.000 abstract description 2
- 238000000429 assembly Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- 239000000758 substrate Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 230000001413 cellular effect Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model relates to a tank needing cooling and heating, specifically to a jacket for the tank. The jacket comprises a plurality of slot parts mutually arranged in parallel and one or more connecting parts connected among the slot parts. The tank comprises a cylinder, two seal heads, a plurality of jacket assemblies, a header feed pipe and a header discharge pipe, wherein the jacket assembly comprises a jacket array which comprises a plurality of jackets arranged around the cylinder; a plurality of communicating pipes disposed between two adjacent jackets of the jacket array; a feed pipe disposed at a tail end of the jacket array, wherein the feed pipe is connected to a medium inlet of the header feed pipe; a discharge pipe disposed at the other tail end of the jacket array, wherein the discharge pipe is connected to a medium outlet of the header discharge pipe. The jacket for a tank and the tank needing cooling and heating and comprising the jacket of the utility model can improve the heat transfer efficiency; and the manufacture process is simple.
Description
Technical field
The utility model relates to a kind of tank body that need cool off or heat, the chuck that particularly a kind of tank body that needs cooling or heat is used.
Background technology
Need the tank body of heating or cooling generally to adopt whole U type, cell type, semicircle tubular type chuck in medicine, food, the chemical industry at home at present.
Fig. 1 has illustrated the longitudinal profile structure of whole U type chuck 10 of prior art, this integral body U type chuck 10 is the cylindrical shell that an elevation profile is the U type, it is provided with medium inlet and media outlet (not shown), during use, this integral body U type chuck 10 is enclosed in outside the cylindrical shell 1 of jar, in heating or cooling medium enters cavity between whole U type chuck 10 and cylindrical shell 1 outside face from the medium inlet, performance heating or cooling effect.The allowable pressure of the whole U type chuck 10 of this prior art is less, generally must not be greater than 1.6MPa, and require tank body and chuck to have thicker wall thickness, economy is relatively poor.
Fig. 2 has illustrated the structure of semicircle tubular type chuck 20 of prior art, this semicircle tubular type chuck 20 is for vertically cutting away half the semicircle pipe that the back forms with a pipe from center shaft, it is provided with medium inlet and media outlet (not shown), during use, this semicircle tubular type chuck 20 is coiled in cylindrical shell 2 outside faces of jar, cavity between semicircle tubular type chuck 20 and cylindrical shell 2 outside faces constitutes a medium channel, heating or cooling medium enters this medium channel from the medium inlet, flow out from media outlet then, thus performance heating or cooling effect.The semicircle tubular type chuck 20 of this prior art is made complicated, and at the bottom of the stock utilization, economy is relatively poor.
Fig. 3 has illustrated the structure of cell type chuck 30 of prior art, this cell type chuck 30 is a sheet metal, evenly be provided with a plurality of solder joints 35 on it, also be provided with medium inlet and media outlet (not shown), during use, this cell type chuck 30 is welded on cylindrical shell 3 outside faces of jar, solder joint 35 places and cylindrical shell 3 welding, by beating the bulging of exerting pressure, form cellular cavity between cell type chuck 30 and cylindrical shell 3 outside faces, heating or cooling medium enters this cellular cavity from the medium inlet, flows out from media outlet then, thus performance heating or cooling effect.During the cellular cavity that forms between medium is by cell type chuck and tank body, medium channel is disorderly and unsystematic, not only can produce the medium stagnant area, also the passage short circuit can take place, be that medium has exported with regard to directly arriving without some zone, therefore, the heating or the cooling performance of cell type chuck are relatively poor.
The defective of the chuck of using for the tank body of the need cooling that overcomes above-mentioned prior art or heating the utility model proposes chuck that the tank body of a kind of new need cooling or heating uses and the tank body that comprises this chuck.
The utility model content
The purpose of this utility model is to provide a kind of tank body that is used for the chuck of tank body and comprises this chuck, this chuck and tank body heat transfer efficiency height, and manufacturing process is simple.
To achieve these goals, the utility model has been taked following technical scheme.
The utility model provides a kind of chuck that is used for tank body, two end sockets that wherein said tank body comprises the cylindrical shell of general cylindrical and is separately positioned on these cylindrical shell two ends, it is characterized in that, described chuck is structure as a whole, and comprise a plurality of slot parts that are arranged in parallel with each other and be connected one or more connecting portions between the adjacent slot part, wherein said a plurality of slot part is outstanding towards the same side of this connecting portion, and described chuck is fixed in the outside face of described cylindrical shell by described connecting portion.
Preferably, described a plurality of slot parts of the utility model chuck are of similar shape and size.
Particularly preferably, the described slot part of each of the utility model chuck comprises the bottom parallel with described connecting portion and is arranged on two sidepieces of the both sides of described bottom that wherein said bottom and corresponding two sidepieces are trapezoidal on the cross-sectional direction of described slot part.
The utility model also provides a kind of tank body, comprising: columniform cylindrical shell has relative both ends; Two end sockets are separately positioned on the relative two ends of described cylindrical shell; It is characterized in that, described tank body also comprises: at least one chuck assembly, be fixedly installed on the outside of described cylindrical shell, and comprise at least one chuck, described chuck is structure as a whole, and comprise a plurality of slot parts that are arranged in parallel with each other and be connected one or more connecting portions between the adjacent slot part, wherein said chuck is fixed in the outside face of described cylindrical shell by its connecting portion, described a plurality of slot part with respect to this connecting portion outside outstanding and and the outside face of described cylindrical shell between form medium channel, wherein said a plurality of slot parts are along the circumferential directions of described cylindrical shell; And one total inlet pipe and always go out pipe, the medium channel with described chuck assembly is connected respectively.
Preferably, the described chuck assembly of tank body of the present utility model comprises single chuck, and comprises that an inlet pipe and goes out pipe, and the head end that is separately positioned on described single chuck is connected with end and with described medium channel.
Preferably, the described chuck assembly of tank body of the present utility model comprises a plurality of chucks around described cylindrical shell setting, and wherein the slot part of adjacent chuck aligns on the circumferencial direction of described cylindrical shell; And one or more cross over pipes, be arranged between adjacent two chucks and and be connected with the described medium channel of its both sides.
Preferably, the described chuck assembly of tank body of the present utility model further comprises: an inlet pipe, described inlet pipe be arranged on described a plurality of chucks first chuck head end and be connected with described medium channel, described inlet pipe is connected by a medium import with described total inlet pipe; And one go out pipe, describedly goes out the tail end that pipe is arranged on last chuck of described a plurality of chucks, and be connected with described medium channel, describedly goes out pipe and always go out pipe and be connected by a media outlet with described.
Preferably, described a plurality of slot parts of the described chuck of tank body of the present utility model are of similar shape and size.
Preferably, the described slot part of each of tank body of the present utility model comprises the bottom parallel with described connecting portion and is arranged on two sidepieces of the both sides of described bottom that wherein said bottom and corresponding two sidepieces are trapezoidal on the cross-sectional direction of described slot part.
Preferably, the described cross over pipe of tank body of the present utility model has two corrugated side margins that match with described jacket surface shape, described inlet pipe and describedly go out pipe and have a corrugated side margins that matches with described jacket surface shape respectively.
Preferably, the described cross over pipe of tank body of the present utility model, described inlet pipe and the described middle part that goes out pipe are provided with a dividing plate with described cross over pipe, described inlet pipe with describedly go out pipe and be separated into two sections that are not connected, be respectively arranged with the medium import on be not connected two sections of the described inlet pipe of being separated by described dividing plate and be communicated with, describedly gone out to be respectively arranged with on be not connected two sections of pipe media outlet and always go out pipe and be communicated with described by what described dividing plate was separated with described total inlet pipe.
The structure design of the utility model chuck makes it can adopt the monoblock stainless steel sheet through the moulding of roller machine roller, and, when producing the tank body that needs cooling or heating, the structure design of the utility model chuck allows earlier the chuck laser welding to be rolled into substrate the cylindrical shell that tube is made the tank body that needs cooling or heating again after on the substrate, therefore, chuck of the present utility model and comprise that the tank body manufacturing process of this chuck is simple, production efficiency is high, workman's operating environment, labour intensity also improve simultaneously, and have improved the safety performance of operating area.
In addition, the structure design of the chuck assembly of the utility model tank body can not cause when making cooling or heating medium by medium channel and be detained and short circuit, has guaranteed the cooling or the heats of tank body.
Description of drawings
By description, will make that the technical solution of the utility model and advantage thereof are apparent below in conjunction with accompanying drawing to the utility model preferred embodiment.
Fig. 1 is the longitudinal profile structural representation of the whole U type chuck of prior art;
Fig. 2 is the structural representation of the semicircle tubular type chuck of prior art;
Fig. 3 is the structural representation of the cell type chuck of prior art;
Fig. 4 is the planar structure scheme drawing of the utility model chuck;
Fig. 5 is the perspective view of the utility model substrate-chuck unit block;
The front elevation of the tank body that Fig. 6 need cool off or heat for the utility model;
Fig. 7 is the chuck assembly front elevation of tank body shown in Figure 6;
Fig. 8 is the connection structure scheme drawing of inlet pipe, medium import and total inlet pipe of the chuck assembly of tank body shown in Figure 6;
Fig. 9 is the lateral plan of cross over pipe of the chuck assembly of tank body shown in Figure 6;
Figure 10 is the structural representation of a variant embodiment of the chuck assembly of tank body shown in Figure 7.
The specific embodiment
Below, by exemplary embodiment the utility model is specifically described.Yet should be appreciated that the element of Miao Shuing, structure and feature also can be attached among other embodiment valuably in one embodiment under the situation that does not have further narration.
Fig. 4 has illustrated the planar structure of the chuck that is used for tank body 40 of the utility model one embodiment, this chuck 40 is structure as a whole, and comprise a plurality of slot parts that are arranged in parallel with each other 41 and be connected one or more connecting portions 43 between the adjacent slot part 41, with reference to figure 5, a plurality of slot parts 41 are outstanding towards the same side of this connecting portion 43, and be of similar shape and size, each slot part 41 comprises the bottom parallel with connecting portion 43 411 and is arranged on two sidepieces 412 of the both sides of bottom 411 that bottom 411 and corresponding two sidepieces 412 are trapezoidal on the cross-sectional direction of slot part 41.As required, slot part 41 also can be arranged to other shapes.
When producing the tank body that needs cooling or heating, the structure design of chuck 40 allows earlier these chuck 40 laser welding to be constituted substrate-chuck unit block 100 on substrate, makes the cylindrical shell of tank body with being rolled into tube after a plurality of substrates-chuck unit block 100 welds together then.Fig. 5 has illustrated the spatial structure of this substrate-chuck unit block 100, this substrate-chuck unit block 100 comprises a substrate 50 and a chuck 40 disposed thereon, form medium channel 46 between the medium channel groove 41 of chuck 40 and the substrate 50, substrate 50 can adopt laser welding with being connected of chuck 40, and bonding wire 48 is arranged on the connecting portion 43 of chuck 40.
Fig. 6 has illustrated the front elevation that needs the tank body 1000 of cooling or heating of the present utility model, and this tank body 1000 comprises that a cylindrical shell 200, one first end socket 300, one second end socket 400, a plurality of chuck assembly 500, one total inlet pipe 600 and always go out to manage 700.
A plurality of chuck assemblies 500 are arranged on the cylindrical shell 200, with reference to figure 7, each chuck assembly 500 comprises: a plurality of chucks 40 constitute a chuck array, be arranged on the cylindrical shell 200, form medium channel 46 (not shown)s between the medium channel groove 41 of chuck 40 and the cylindrical shell 200, these a plurality of chucks 40 arrange and make medium channel groove 41 alignment one by one on level attitude of adjacent two chucks 40 around cylindrical shell 200 horizontal one-tenth one; Many cross over pipes 60, be arranged between adjacent two chucks 40 a plurality of chucks 40 are coupled together in a circumferential direction, and adjacent media passage 46 (not shown)s of communication level alignment, make cooling or heating medium to flow along the circumferencial direction of cylindrical shell, guarantee cooling or heats; One inlet pipe 70 is arranged on the terminal and is communicated with medium channel 46 (not shown)s of chuck array that a plurality of chucks 40 constitute, and inlet pipe 70 is provided with a medium import 75 and is communicated with total inlet pipe 600; One goes out pipe 80, and it is terminal and is communicated with medium channel 46 (not shown)s to be arranged on another of chuck array that a plurality of chucks 40 constitute, and this goes out pipe 80 and is provided with a media outlet 85, this media outlet 85 with always go out to manage 700 and be communicated with.
Fig. 8 has illustrated the connection structure of inlet pipe 70, medium import 75 with total inlet pipe 600 of chuck assembly 500, and the inlet pipe 70 of each chuck assembly 500 align in vertical direction, and inlet pipe 70 is communicated with total inlet pipe 600 by medium import 75.Each chuck assembly 500 go out pipe 80, media outlet 85 and the connection structure that always goes out pipe 700 similarly.
Fig. 9 has illustrated the lateral plan of cross over pipe 60, this cross over pipe 60 is a two ends osed top semicircle pipe, has an opening, this opening has two side margins 62 and two end edge, two side margins 62 are corrugated so that cooperate with chuck 40 clampings, two end edge cooperate with barrel outer surface, can adopt between side margins 62 and the chuck 40 and between end edge and the cylindrical shell 200 to be welded to connect.
Inlet pipe 70 and go out pipe 80 shapes and cross over pipe 60 similar, but inlet pipe 70 and go out pipe 80 and all have only a side margins to be corrugated to cooperate with chuck 40 clampings, another side margins cooperates with barrel outer surface, inlet pipe 70 and go out between the corrugated side margins and chuck 40 of pipe 80, can adopt between non-corrugated side margins and end edge and the cylindrical shell 200 and be welded to connect.
In use, cooling or heating medium enters total inlet pipe 600 under certain pressure after enters inlet pipe 70 from the medium import 75 of each chuck assembly, enter each medium channel 46 then, after the week of detouring on the cylindrical shell 200, enter out pipe 80, and always be aggregated into to go out to manage 700, flow out then through media outlet 85.
The cross over pipe of the chuck assembly of the utility model tank body, inlet pipe and go out pipe and can also adopt another kind of structure, with reference to Figure 10, promptly at cross over pipe 60, inlet pipe 70 is provided with dividing plate 61 respectively with the middle part that goes out pipe 80,71 and 81, this dividing plate 61,71 and 81 respectively with cross over pipe 60, inlet pipe 70 and go out pipe 80 and be separated into the two sections that are not connected, the two sections of the inlet pipe of being separated by dividing plate 71 70 are provided with a medium import 75 respectively, the two sections of being separated by dividing plate 81 that go out pipe 80 are provided with a media outlet 85 respectively, all medium imports 75 all are communicated with total inlet pipe, and all media outlets 85 all are communicated with always going out to manage.When cross over pipe, inlet pipe with when going out pipe and adopting this structure, the medium channel of each chuck assembly is separated into the two parts up and down that are not connected.In use, cooling or heating medium enter total inlet pipe under certain pressure after, enter the two sections of inlet pipe 70 respectively from two medium imports 75 of each chuck assembly, flow through the top medium channel and the bottom medium channel of chuck assembly respectively, after the week of detouring on the cylindrical shell, enter out the two sections of pipe respectively, flow into from two media outlets 85 that go out pipe 80 respectively then and always go out pipe, outflow then.
Should be understood that; the utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the utility model claim.
Claims (11)
1. chuck that is used for tank body, two end sockets that wherein said tank body comprises the cylindrical shell of general cylindrical and is separately positioned on these cylindrical shell two ends, it is characterized in that, described chuck is structure as a whole, and comprise a plurality of slot parts that are arranged in parallel with each other and be connected one or more connecting portions between the adjacent slot part, wherein said a plurality of slot part is outstanding towards the same side of this connecting portion, and described chuck is fixed in the outside face of described cylindrical shell by described connecting portion.
2. chuck according to claim 1 is characterized in that, described a plurality of slot parts are of similar shape and size.
3. chuck according to claim 2, it is characterized in that, each described slot part comprises the bottom parallel with described connecting portion and is arranged on two sidepieces of the both sides of described bottom that wherein said bottom and corresponding two sidepieces are trapezoidal on the cross-sectional direction of described slot part.
4. tank body comprises:
Columniform cylindrical shell has relative both ends;
Two end sockets are separately positioned on the relative two ends of described cylindrical shell;
It is characterized in that described tank body also comprises:
At least one chuck assembly, be fixedly installed on the outside of described cylindrical shell, and comprise at least one chuck, described chuck is structure as a whole, and comprise a plurality of slot parts that are arranged in parallel with each other and be connected one or more connecting portions between the adjacent slot part, wherein said chuck is fixed in the outside face of described cylindrical shell by its connecting portion, described a plurality of slot part with respect to this connecting portion outside outstanding and and the outside face of described cylindrical shell between form medium channel, wherein said a plurality of slot parts are along the circumferential directions of described cylindrical shell; And
One total inlet pipe and always goes out pipe, and the medium channel with described chuck assembly is connected respectively.
5. tank body according to claim 4 is characterized in that, described chuck assembly comprises single chuck, and comprises that an inlet pipe and goes out pipe, and the head end that is separately positioned on described single chuck is connected with end and with described medium channel.
6. tank body according to claim 4 is characterized in that, described chuck assembly comprises a plurality of chucks around described cylindrical shell setting, and wherein the slot part of adjacent chuck aligns on the circumferencial direction of described cylindrical shell; And one or more cross over pipes, be arranged between adjacent two chucks and and be connected with the described medium channel of its both sides.
7. tank body according to claim 6 is characterized in that, described chuck assembly further comprises:
One inlet pipe, described inlet pipe be arranged on described a plurality of chucks first chuck head end and be connected with described medium channel, described inlet pipe is connected by a medium import with described total inlet pipe;
And one go out pipe, describedly goes out the tail end that pipe is arranged on last chuck of described a plurality of chucks, and be connected with described medium channel, describedly goes out pipe and always go out pipe and be connected by a media outlet with described.
8. tank body according to claim 7 is characterized in that, described a plurality of slot parts of described chuck are of similar shape and size.
9. tank body according to claim 8, it is characterized in that, each described slot part comprises the bottom parallel with described connecting portion and is arranged on two sidepieces of the both sides of described bottom that wherein said bottom and corresponding two sidepieces are trapezoidal on the cross-sectional direction of described slot part.
10. tank body according to claim 9, it is characterized in that, described cross over pipe has two corrugated side margins that match with described jacket surface shape, described inlet pipe and describedly go out pipe and have a corrugated side margins that matches with described jacket surface shape respectively.
11. according to any described tank body of claim among the claim 7-10, it is characterized in that, described cross over pipe, described inlet pipe and the described middle part that goes out pipe are provided with a dividing plate with described cross over pipe, described inlet pipe with describedly go out pipe and be separated into two sections that are not connected, be respectively arranged with the medium import on be not connected two sections of the described inlet pipe of being separated by described dividing plate and be communicated with, describedly gone out to be respectively arranged with on be not connected two sections of pipe media outlet and always go out pipe and be communicated with described by what described dividing plate was separated with described total inlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205301784U CN201901365U (en) | 2010-09-15 | 2010-09-15 | Tank needing cooling and heating and jacket thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205301784U CN201901365U (en) | 2010-09-15 | 2010-09-15 | Tank needing cooling and heating and jacket thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201901365U true CN201901365U (en) | 2011-07-20 |
Family
ID=44271963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205301784U Expired - Lifetime CN201901365U (en) | 2010-09-15 | 2010-09-15 | Tank needing cooling and heating and jacket thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201901365U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102975965A (en) * | 2011-09-05 | 2013-03-20 | 田菱精细化工（昆山）有限公司 | Heating device for external heat exchanging device |
| CN103822504A (en) * | 2012-11-16 | 2014-05-28 | 南通中集大型储罐有限公司 | Heat exchange jacket, fermentation tank and manufacturing method of heat exchange jacket |
| CN107608432A (en) * | 2017-10-30 | 2018-01-19 | 郑州弘毅电子技术有限公司 | Vinous fermentation control system |
| CN109751834A (en) * | 2019-02-28 | 2019-05-14 | 南通中集安瑞科食品装备有限公司 | Jacket type storage tank |
-
2010
- 2010-09-15 CN CN2010205301784U patent/CN201901365U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102975965A (en) * | 2011-09-05 | 2013-03-20 | 田菱精细化工（昆山）有限公司 | Heating device for external heat exchanging device |
| CN103822504A (en) * | 2012-11-16 | 2014-05-28 | 南通中集大型储罐有限公司 | Heat exchange jacket, fermentation tank and manufacturing method of heat exchange jacket |
| CN107608432A (en) * | 2017-10-30 | 2018-01-19 | 郑州弘毅电子技术有限公司 | Vinous fermentation control system |
| CN109751834A (en) * | 2019-02-28 | 2019-05-14 | 南通中集安瑞科食品装备有限公司 | Jacket type storage tank |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 226010 Nantong economic and Technological Development Zone and Xing Road 109, Jiangsu Patentee after: NANTONG CIMC ENRIC FOOD EQUIPMENT CO., LTD. Patentee after: Chinese International Marine Container (Group) Co., Ltd. Address before: 226010 Nantong economic and Technological Development Zone and Xing Road 109, Jiangsu Patentee before: HOLVRIEKA (China) Co., Ltd Patentee before: Chinese International Marine Container (Group) Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20110720 |
|
| CX01 | Expiry of patent term |