CN201014888Y - Vacuum freezing dryer - Google Patents
Vacuum freezing dryer Download PDFInfo
- Publication number
- CN201014888Y CN201014888Y CNU2007200678689U CN200720067868U CN201014888Y CN 201014888 Y CN201014888 Y CN 201014888Y CN U2007200678689 U CNU2007200678689 U CN U2007200678689U CN 200720067868 U CN200720067868 U CN 200720067868U CN 201014888 Y CN201014888 Y CN 201014888Y
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- valve
- heat exchanger
- freeze
- drying box
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- Expired - Lifetime
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The utility model relates to a vacuum freeze dryer, and is characterized in that a refrigerating system, a cold/heat medium circulating system and a direct low-temperature liquid nitrogen LN2 system replace the cold exchanger, the circulating pump, the vapor condenser, the compressor and the expansion valve; and at the same time the dryer is provided with two heat exchangers. The utility model is capable of quickly cooling a freeze-drying box used to preserve the cell activity of biological products, then quickly cooling the vapor condenser with direct low-temperature liquid nitrogen LN2 by switching a valve, and recovering the residual heat produced by the nitrogen in the freeze-drying process to keep the temperature of the dummy plate in the freeze-drying box at a stable level. The utility model has the advantage of having the ability to quickly cool the freeze-drying box and the vapor condenser and keep the temperature of the dummy plate in the freeze-drying box at a stable level.
Description
Technical field
The utility model relates to a kind of vacuum freeze drier, and relating in particular to a kind of is indirect low-temperature receiver is removed liquid or title solvent from freeze goods freeze dryer with liquid nitrogen-gas nitrogen (LN2-GN2), belongs to the vacuum freeze drier technical field.
Background technology
Existing freeze dryer mainly is made up of vacuum system and refrigeration system:
As shown in Figure 1, freeze dryer is made up of freeze drying box 1, heater 2, cool exchanger 3, circulating pump 4, water condenser 5, compressor 6, expansion valve 7,10, magnetic valve 8,9, draining valve 11, water vapour coagulator 12, vavuum pump 13, inferior isolating valve 14, vent valve 15,18, condenser pipe 16, main isolating valve 17 and shelf 19.
Vacuum system is made up of freeze drying box 1, main isolating valve 17, condenser 12, inferior isolating valve 14, vavuum pump 13.
The vacuum system brief description is as follows:
Shelf assembly 19 mobilizable and that can work in-55 ℃～+ 70 ℃ temperature ranges is arranged in the freeze drying box, the effect provide material freeze use with heating sublimation, main isolating valve 17 is connected between freeze drying box 1 and the condenser 12, effect one when being standard-sized sheet so that freeze on the freeze drying box shelf in the material distillation water vapour by this valve and the pairing pressure differential of both saturated vapor pressures as motive force, make water vapour move to the interior condenser pipe surface of being hanged down 10～20 ℃ than material distillation interface temperature of condenser and capture and be converted into ice, the 2nd, the dry concluding time is every periodically closing this valve 1min, as freeze drying box internal pressure at the appointed time less than setting, automatically judge that freeze-drying finishes, otherwise continuation freeze-drying process, the 3rd, freeze-drying is closed this valve after finishing, freeze drying box turnover pallet and condenser defrosting are carried out simultaneously, reduced non-cutting time; Condenser is a low-temperature surface that captures water vapour and be converted into ice, prevents that water vapour from directly entering vavuum pump.14 buffer actions of inferior isolating valve.Vavuum pump 13 is to take out system vacuum in advance and reach the desired vacuum of technology, keeps the total pressure of system simultaneously, and the incoagulable gas that material distils is out also got rid of by it.
Refrigeration system is briefly as follows:
Refrigeration system is made of the cold/heating agent device of working respectively, direct expansion condenser pipe, a shared cover or the above compressor bank of two covers.Cold/heating agent device is made of institutes such as shelf 19, heater 2, cool exchanger 3, tubing pump 4, expansion valve 7, magnetic valves 8, its effect is that the refrigeration working medium that shelf cools off by carrier and circulation carries out exchange heat, and refrigeration working medium is carried by compressor and expansion valve throttling action, and carrier carries cold to shelf that shelf temperature is lowered by tubing pump.Shelf heats up and by the heater heating carrier and by tubing pump transfer heat to shelf shelf temperature to be raise, and its objective is to provide to freeze that the ice distillation is the latent heat of sublimation 670kcal/kg of water vapour in the material.Refrigeration working medium is carried by compressor, expansion valve direct expansion throttling in the direct expansion formula condenser pipe, draws the heat of condenser pipe itself and distillation water vapour.
Use positive displacement piston-type refrigeration compressor by switching respectively before and after the required technological process during cooling of existing freeze dryer freeze drying box shelf and condenser, be freezing after the freeze drying box again switching solenoid valve carry out freezer condenser, though especially the condenser pipe structure of condenser direct expansion throttling is simple, economical, and its defective is arranged:
1. the ability of its reply water vapour load is relatively poor during the primary drying, and promptly compressor assembly expansion valve liquid supply rate lags in freezing the distillation water vapour load that goods produce.Strengthen the capacity of refrigeration machine, yet undue increasing produces unnecessary energy loss in the time of can making the system compresses machine be in light load or zero load again;
2. the goods distillation water vapour load that freezes from drying box reduces at leisure during the redrying, is in the zero load state until last compressor.If system's return line and nearly compressor air suction end are not installed gas-liquid separator or the rich quantity not sufficient of gas-liquid separator design volume, unevaporated-65 ℃～-70 ℃ low temperature freon liquid (liquid-vapor mixture) are easier to enter compressor formation Wet Compression and cause liquid hammer engine knock phenomenon in the condenser.If system is furnished with many cover compressor assemblies, can stop wherein one or above compressor operating, but because the temperature recovery of part condenser pipe causes the pairing saturated vapor total pressure of system to raise in the condenser, cause the interior vacuum of drying box of freeze-drying system that certain fluctuation is arranged, be unfavorable for the quick effusion of the remaining moisture content in the dried product on the contrary;
3. redrying phase not, because the minimizing of system's back-steam amount, being increased by lubricating oil viscosity under low-temperature condition of oil circulation accumulative total repeatedly in the condenser condenses pipe makes the lubricating oil difficulty that refluxes.The Pk/Po compression ratio increases again, compressor exhaust temperature raises, about 110 ℃～120 ℃ of exhaust valve plate place temperature, easy sex change of lubricating oil even carbonization in the compressor, cause the compressor crankcase internal oil passages to stop up, bent axle and piston rod bearing are bitten, are reached the minimizing of middle pressure arm back-steam amount mutually and cause compressor electric motor heating even scaling loss.
4. owing to be in vapour-liquid two-phase state in the evaporation tube, flow resistance increases in the pipe, and the import and export place temperature difference in same loop is bigger.Therefore, the ability of evaporation tube length direction condensed steam is also inconsistent, causes the uneven possibility increase of frost in the water vapour coagulator.
Summary of the invention
The purpose of this utility model is that invention is a kind of can be to keeping the freeze drying box fast cooling of goods such as biological cell activity, switch valve carries out direct low temperature liquid nitrogen LN2 fast cooling to water vapour coagulator then, and the recycling of the nitrogen waste heat in the freeze-drying process makes the constant vacuum freeze drier in the temperature range that sets of freeze drying box shelf temperature.
For realizing above purpose, the technical solution of the utility model provides a kind of vacuum freeze drier, comprise freeze drying box, heater, draining valve, water vapour coagulator, vavuum pump, inferior isolating valve, vent valve, condenser pipe, main isolating valve and shelf, shelf is located in the freeze drying box, one end of shelf is connected with heater, condenser pipe is located in the condenser, main isolating valve connects freeze drying box and water vapour coagulator, vavuum pump is connected with water vapour coagulator by time isolating valve, vent valve connects freeze drying box, vent valve and draining valve are located at the upper and lower side of water vapour coagulator respectively, it is characterized in that, heater is connected with little heat exchanger by circulating pump, the other end of shelf is connected with little heat exchanger upper end by big heat exchanger upper end, gas nitrogen is connected with little heat exchanger upper end, pass through valve in parallel simultaneously and be connected with big heat exchanger lower end one side with condenser pipe one end, the other end of condenser pipe is leaded up to valve and is connected with big heat exchanger lower end opposite side, valve is passed through in another bypass, magnetic valve, control valve is connected with big heat exchanger lower end opposite side, big heat exchanger lower end one side is connected with little heat exchanger lower end by valve, control valve is connected with condenser pipe one end by controller, liquid nitrogen is connected with big heat exchanger lower end one side with control valve by magnetic valve, controller is connected with big heat exchanger lower end one side by control valve, and safety valve is located at the upper end of big heat exchanger.
Described control valve is the PID control valve.
The utility model has been cancelled cool exchanger, circulating pump, water condenser, compressor, expansion valve, refrigeration system and cold/heating agent circulatory system, direct low temperature liquid nitrogen LN2 system have been increased, be provided with two heat exchangers simultaneously, can be to keeping the freeze drying box fast cooling of biological cell active product, switch valve carries out direct low temperature liquid nitrogen LN2 fast cooling to water vapour coagulator then, and the recycling of the nitrogen waste heat in the freeze-drying process makes the freeze drying box shelf temperature constant.
The utility model has the advantages that:
1. the freeze drying box rate of temperature fall can carry out the PID adjusting, is fit to the rate of temperature fall requirement of different goods;
2. what adopt is band PID control valve rather than self-inducting heating power expansion valve, and the adaptibility to response of the water vapour payload that the condenser pipe surface is accepted is strong;
3. water vapour coagulator adopts low temperature liquid nitrogen LN2 direct cooling mode, and the condenser pipe surface temperature can reach below-120 ℃, is fit to very much in the goods the more mixed vapour of organic solvent content and catches shortly, does not cause the pumping fluid performance failure in the vavuum pump and can not enter;
4. even electric power system takes place to have a power failure in short-term or nitrogen supply system electrical part short trouble, by the emergency bypass valve holding time of freeze-drying system can be prolonged greatly, promptly anti-power failure performance is better than direct expansion formula feed liquid way;
5 the utility model are provided with two heat exchangers, utilize in the water vapour coagulator residual air after the liquid nitrogen heat exchange can carry out the constant of shelf temperature by another heat exchanger, stop the waste heat that is produced behind the heater when heating agent circulatory system reaches design temperature or claim thermal inertia to alleviate, make shelf temperature continue to rise.
Description of drawings
Fig. 1 is former vacuum freeze drier structural representation;
Fig. 2 is a kind of vacuum freeze drier structural representation of the utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Embodiment
As shown in Figure 2, be a kind of vacuum freeze drier structural representation of the utility model, described a kind of vacuum freeze drier is made up of freeze drying box 1, heater 2, draining valve 11, water vapour coagulator 12, vavuum pump 13, inferior isolating valve 14, vent valve 15,18, condenser pipe 16, main isolating valve 17, shelf 19, valve 20,22,23,24,25, little heat exchanger 21, controller 26, magnetic valve 27,28, control valve 29,30, controller 31, big heat exchanger 32, safety valve 33, circulating pump 3, gas nitrogen 35 and liquid nitrogen 36.
Shelf 19 is installed in the freeze drying box 1, one end of shelf 19 is connected with heater 2, condenser pipe 16 is installed in the water vapour coagulator 12, main isolating valve 17 connects freeze drying box 1 and water vapour coagulator 12, vavuum pump 13 is connected with water vapour coagulator 12 by time isolating valve 14, vent valve 18 connects freeze drying box 1, vent valve 15 and draining valve 11 are installed in the upper and lower side of water vapour coagulator 12 respectively, heater 2 is connected with little heat exchanger 21 by circulating pump 3, the other end of shelf 19 is connected with little heat exchanger 21 upper ends by big heat exchanger 32 upper ends, gas nitrogen 35 is connected with little heat exchanger 21 upper ends, be connected with big heat exchanger 32 lower ends one side with condenser pipe 16 1 ends with 24 by valve 20 in parallel simultaneously, the other end of condenser pipe 16 is leaded up to valve 23 and is connected with big heat exchanger 32 lower end opposite sides, another bypass is by magnetic valve 28, control valve 30 is connected with big heat exchanger 32 lower end opposite sides, big heat exchanger 32 lower ends one side is connected with little heat exchanger 21 lower ends by valve 22, control valve 30 is connected with condenser pipe 16 1 ends by controller 26, liquid nitrogen 36 is by magnetic valve 27 and control valve 29, reach with the valve 25 of its bypass and be connected with big heat exchanger 32 lower ends one side, controller 31 is connected with big heat exchanger 32 lower ends one side by control valve 29, safety valve 33 is located at the upper end of big heat exchanger 32, described control valve 29,30 is the PID control valve.
Vacuum system of the present utility model is made up of interior freeze drying box 1 by shelf assembly 19, interior water vapour coagulator 12 by condenser pipe 16, vavuum pump 13, inferior isolating valve 14, main isolating valve 17, vent valve 15,18 and draining valve 11.
Refrigeration system is made of heat exchanger 32 systems, cold/the heating agent circulatory system, direct low temperature liquid nitrogen LN2 system.
Liquid nitrogen LN2 is the environmental protection type refrigeration working medium that meets the world " Montreal Agreement " regulation.
Cold/heating agent circulatory system is made of the hot side and the carrier of shelf 19, heater 2, tubing pump 3, big heat exchanger 32 and little heat exchanger 21.
Carrier is that meet the GMP rules a kind of has excellent low temperature flowability, heat-resisting quantity, good heat conductivity, avirulence, non-corrosive special liquid.
The valve 23,24 of emergency operation was formed when directly low temperature liquid nitrogen LN2 system was by the control valve 30 of magnetic valve 28, band PID, controller 26, condenser pipe 16, valve 20 and unexpected temporary stoppage.
During work, start tubing pump, the work of the heating agent circulatory system; Connect liquid nitrogen LN2 receiver and supply with the refrigeration system input; Connect magnetic valve 27 and PID control valve 29, the heating agent circulatory system is in the fast cooling process like this.
In the cooling of the heating agent circulatory system, water vapour coagulator 12 is vacuumized, start vavuum pump 13, inferior isolating valve 14, water vapour coagulator 12 is in the state of vacuumizing, and forms the similar thermal insulation layer that does not almost have the air molecule convection current.
When shelf 19 temperature in the freeze drying box 1 reach setting value and keep the temperature-time section, switch to the control valve 30 of magnetic valve 28 and band PID by magnetic valve 27, water vapour coagulator 12 is carried out direct low temperature liquid nitrogen LN2 cool, this system's operation continues to till the freeze-drying end.
When water vapour coagulator 12 reaches desired temperature value, open main isolating valve 17, system is in the vacuum.When the system of reaching was in a certain pressure, system had been in sublimation process.
When shelf 19 temperature reach the temperature that sets and continue insulation when reaching requirement, start heater 2, hot media is heated up, carry hot medias to shelf 19 by tubing pump 3, make shelf 19 temperature be elevated to set definite value and continue insulation a period of time.Can provide like this and freeze the required thermal energy of distillation that ice and organic solvent mixture in the material are converted into mixed vapour, the saturated vapour pressure of dependence freeze drying box 1 and water vapour coagulator Room 12 2 is poor, finishes the transition process of mixed vapour.
When shelf 19 temperature reached the temperature that sets, heater 2 quit work.Because circulating pump 3 and carrier, carrier and the heat of inner-walls of duct friction generation, the importing of external heat, the waste heat of heater make the bed temperature of system continue to rise 2 ℃ or 3 ℃.For this reason, connect the control valve 29 of magnetic valve 27 and band PID, make the LN2 liquid nitrogen through excessive heat exchanger 32 and little heat exchanger 21, the bed temperature that has heated up is fallen 3 ℃ or 4 ℃ after, disconnect the control valve 29 of magnetic valve 27 and band PID.Its medium and small heat exchanger 21 mainly is to make full use of the sensible heat that the LN2 liquid nitrogen vaporization is absorbed heat into GN2 gas nitrogen, with conserve energy.Big heat exchanger 32, little heat exchanger 21 can be selected according to the size of the required cooling energy of system.
Claims (2)
1. vacuum freeze drier, comprise freeze drying box (1), heater (2), draining valve (11), water vapour coagulator (12), vavuum pump (13), inferior isolating valve (14), vent valve (15,18), condenser pipe (16), main isolating valve (17) and shelf (19), shelf (19) is located in the freeze drying box (1), one end of shelf (19) is connected with heater (2), condenser pipe (16) is located in the condenser (12), main isolating valve (17) connects freeze drying box (1) and water vapour coagulator (12), vavuum pump (13) is connected with water vapour coagulator (12) by time isolating valve (14), vent valve (18) connects freeze drying box (1), vent valve (15) and draining valve (11) are located at the upper and lower side of water vapour coagulator (12) respectively, it is characterized in that, heater (2) is connected with little heat exchanger (21) by circulating pump (3), the other end of shelf (19) is connected with little heat exchanger (21) upper end by big heat exchanger (32) upper end, gas nitrogen (35) is connected with little heat exchanger (21) upper end, be connected with big heat exchanger (32) lower end one side with condenser pipe (16) one ends with (24) by valve (20) in parallel simultaneously, the other end of condenser pipe (16) is leaded up to valve (23) and is connected with big heat exchanger (32) lower end opposite side, another bypass is by magnetic valve (28), control valve (30) is connected with big heat exchanger (32) lower end opposite side, big heat exchanger (32) lower end one side is connected with little heat exchanger (21) lower end by valve (22), control valve (30) is connected with condenser pipe (16) one ends by controller (26), liquid nitrogen (36) is by magnetic valve (27), control valve (29), and bypass valve (25) is connected with big heat exchanger (32) lower end one side, controller (31) is connected with big heat exchanger (32) lower end one side by control valve (29), and safety valve (33) is located at the upper end of big heat exchanger (32).
2. a kind of vacuum freeze drier according to claim 1 is characterized in that, described control valve (29,30) is the PID control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200678689U CN201014888Y (en) | 2007-03-15 | 2007-03-15 | Vacuum freezing dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200678689U CN201014888Y (en) | 2007-03-15 | 2007-03-15 | Vacuum freezing dryer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201014888Y true CN201014888Y (en) | 2008-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200678689U Expired - Lifetime CN201014888Y (en) | 2007-03-15 | 2007-03-15 | Vacuum freezing dryer |
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| CN (1) | CN201014888Y (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636016A (en) * | 2012-04-27 | 2012-08-15 | 王海军 | System and method for recycling and using waste heat of freeze dryer |
| CN103069240A (en) * | 2010-08-04 | 2013-04-24 | Ima生命北美股份有限公司 | Bulk freeze drying using spray freezing and stirred drying |
| CN105358927A (en) * | 2013-06-27 | 2016-02-24 | 株式会社前川制作所 | Freeze-drying system and freeze-drying method |
| CN106482418A (en) * | 2015-08-28 | 2017-03-08 | 楚天科技股份有限公司 | Freeze dryer gas/liquid nitrogen refrigeration system |
| CN107621334A (en) * | 2016-07-15 | 2018-01-23 | 核工业西南物理研究院 | For hot helium leak test gas heating circulation system and quickly heat cooling means |
| US9945611B2 (en) | 2010-08-04 | 2018-04-17 | Ima Life North America Inc. | Bulk freeze drying using spray freezing and agitated drying |
| CN108962484A (en) * | 2018-06-20 | 2018-12-07 | 富通集团（天津）超导技术应用有限公司 | Hyperconductive cable crosses ice chest, cooling system and cooling means with phase-change heat-exchange |
| CN113623950A (en) * | 2021-06-21 | 2021-11-09 | 以农环境工程有限公司 | Freezing sublimation garbage treatment process |
| WO2022011735A1 (en) * | 2020-07-16 | 2022-01-20 | 徐小杨 | Sublimation-based dehydration device |
| CN114688864A (en) * | 2020-12-31 | 2022-07-01 | 浙江同景新能源集团有限公司 | Cold trap ice melting and water draining method and system of freeze-drying equipment |
| WO2023175453A1 (en) * | 2022-03-16 | 2023-09-21 | Liocreo S.R.L. | Freeze-drying plant |
-
2007
- 2007-03-15 CN CNU2007200678689U patent/CN201014888Y/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103069240A (en) * | 2010-08-04 | 2013-04-24 | Ima生命北美股份有限公司 | Bulk freeze drying using spray freezing and stirred drying |
| US9052138B2 (en) | 2010-08-04 | 2015-06-09 | Ima Life North America Inc. | Bulk freeze drying using spray freezing and stirred drying |
| CN103069240B (en) * | 2010-08-04 | 2015-06-17 | Ima生命北美股份有限公司 | Bulk freeze drying system and method using spray freezing and stirred drying |
| US9945611B2 (en) | 2010-08-04 | 2018-04-17 | Ima Life North America Inc. | Bulk freeze drying using spray freezing and agitated drying |
| CN102636016B (en) * | 2012-04-27 | 2014-03-12 | 王海军 | System and method for recycling and using waste heat of freeze dryer |
| CN102636016A (en) * | 2012-04-27 | 2012-08-15 | 王海军 | System and method for recycling and using waste heat of freeze dryer |
| US10309723B2 (en) | 2013-06-27 | 2019-06-04 | Mayekawa Mfg.Co., Ltd. | Freeze-drying system and freeze-drying method |
| CN105358927A (en) * | 2013-06-27 | 2016-02-24 | 株式会社前川制作所 | Freeze-drying system and freeze-drying method |
| CN105358927B (en) * | 2013-06-27 | 2017-01-18 | 株式会社前川制作所 | Freeze-drying system and freeze-drying method |
| CN106482418A (en) * | 2015-08-28 | 2017-03-08 | 楚天科技股份有限公司 | Freeze dryer gas/liquid nitrogen refrigeration system |
| CN107621334A (en) * | 2016-07-15 | 2018-01-23 | 核工业西南物理研究院 | For hot helium leak test gas heating circulation system and quickly heat cooling means |
| CN107621334B (en) * | 2016-07-15 | 2019-09-17 | 核工业西南物理研究院 | For hot helium leak test gas heating circulation system and quickly heat cooling means |
| CN108962484A (en) * | 2018-06-20 | 2018-12-07 | 富通集团（天津）超导技术应用有限公司 | Hyperconductive cable crosses ice chest, cooling system and cooling means with phase-change heat-exchange |
| WO2022011735A1 (en) * | 2020-07-16 | 2022-01-20 | 徐小杨 | Sublimation-based dehydration device |
| CN114688864A (en) * | 2020-12-31 | 2022-07-01 | 浙江同景新能源集团有限公司 | Cold trap ice melting and water draining method and system of freeze-drying equipment |
| CN113623950A (en) * | 2021-06-21 | 2021-11-09 | 以农环境工程有限公司 | Freezing sublimation garbage treatment process |
| WO2023175453A1 (en) * | 2022-03-16 | 2023-09-21 | Liocreo S.R.L. | Freeze-drying plant |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI FULONG TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: DONGFULONG SCI-TECH CO., LTD., SHANGHAI Effective date: 20080718 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080718 Address after: Shanghai city Minhang District Fanghe Road No. 2199, zip code: 201109 Patentee after: Shanghai Tofflon Science and Technology Co., Ltd. Address before: Shanghai city Minhang District Fanghe Road No. 2199, zip code: 201109 Patentee before: Dongfulong Science & Technology Co., Ltd., Shanghai |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080130 |