CN102759910A - Automatic temperature control method and device for optical fiber coating - Google Patents
Automatic temperature control method and device for optical fiber coating Download PDFInfo
- Publication number
- CN102759910A CN102759910A CN2012102006658A CN201210200665A CN102759910A CN 102759910 A CN102759910 A CN 102759910A CN 2012102006658 A CN2012102006658 A CN 2012102006658A CN 201210200665 A CN201210200665 A CN 201210200665A CN 102759910 A CN102759910 A CN 102759910A
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- optical fiber
- temperature
- coating
- conducting medium
- heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0241—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to elongated work, e.g. wires, cables, tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
- B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/12—General methods of coating; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/12—General methods of coating; Devices therefor
- C03C25/20—Contacting the fibres with applicators, e.g. rolls
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Coating Apparatus (AREA)
Abstract
The invention relates to an automatic temperature control method and device for an optical fiber coating. The automatic temperature control device comprises an optical fiber coating device provided with a heating chamber, wherein the heating chamber of the optical fiber coating device is communicated with a circular heater through a circulating pipeline; liquid heat-conducting media are filled in the heating chamber, the circulating pipeline and the circular heater; and the circular heater is used for heating coating in the optical fiber coating device by circularly heating the liquid heat-conducting media. The automatic control method is characterized in that the automatic control method comprises the following steps of: arranging a processing control unit; controlling the heating process of the circular heater by acquiring a wire drawing speed sensing signal and a liquid heat-conducting medium temperature sensing signal and comparing the wire drawing speed sensing signal and the liquid heat-conducting medium temperature sensing signal with a preset parameter value through the processing control unit, thus realizing the automatic control and adjusting process of the temperature of the coating in the optical fiber coating device. According to the automatic temperature control method and device disclosed by the invention, the temperature of the coating can be automatically changed along with the wire drawing speed in the wire drawing process of optical fibers, and favorable matching between the temperature (viscosity) of the coating and the wire drawing speed is achieved, so that the quality of a coating layer on the surface of the optical fiber is ensured and the finished product rate of optical fiber processing is increased.
Description
Technical field
The present invention relates to a kind of optical fiber coating procedure optical fiber coatings temperature auto control method and device of being used for, belong to the optical fiber processing technique field.
Background technology
In the drawing optical fibers process,, need coat multiple coating layer (coating) at optical fiber surface for the cover glass optical fiber surface.Optical fiber coating is accomplished through coated fiber coating, and optical fiber coatings adopts the macromolecule resin combination materials usually, and normal temperature is down for liquid.The variation of the viscosity with temperature of coating and changing.In order to obtain optical fiber surface coat quality preferably, need to keep between dope viscosity, coating temperature and the drawing speed good coupling in the drawing process.
Along with the raising of drawing speed, the surface temperature of optical fiber is also increasingly high in the drawing process.For the temperature with optical fiber is complementary, the temperature of coating also needs to increase thereupon.Traditional coating temperature heating means are the fixed temperature heating means; Adopt external firing equipment heating liquid (aqueous water or mineral oil), through the hydronic coating container, heat coating through coating container more afterwards; In drawing process, the coating temperature remains constant.If the coating temperature is too high then cause coating to overflow easily or apply diameter exceeding standard and scrapping when low speed, if when high speed the coating temperature cross low cause easily applying inhomogeneous, apply the interface and coat the defects such as ripple occur.Along with the development of optic fibre manufacturing technology, the drawing speed of optical fiber is more and more faster, at present generally more than 1500 meters/minute.In this case, adopt traditional fixed temperature heating means more and more to be difficult to satisfy the demand that high-speed wire-drawing applies coating, the coating quality of optical fiber is difficult to be guaranteed.In the high-speed wire-drawing process, problems such as coating overflows, coat defective are more and more serious, become the serious hindrance that the restriction drawing speed further improves.
Summary of the invention
Technical matters to be solved by this invention is a kind of drawing optical fibers process optical fiber coatings temperature autocontrol method and the device that provides to the deficiency of above-mentioned prior art existence; Realize that the coating temperature changes with drawing speed automatically in the drawing optical fibers process; Thereby reach the matched well of coating temperature (or viscosity) and drawing speed, the quality of optical fiber surface coat is guaranteed.
The present invention for the technical scheme of the coating temperature autocontrol method that problem adopted of the above-mentioned proposition of solution is: include the optical fiber applicator that the chamber of heating is set; The chamber of heating of optical fiber applicator is connected with recirculation heater through circulating line; Heat chamber, circulating line and recirculation heater fills liquid heat-conducting medium; Recirculation heater is heated to the coating in the optical fiber applicator through the circulation heating of liquid towards heat-conducting medium; It is characterized in that being provided with processing and control element (PCE); Processing and control element (PCE) is compared with preset parameter values through gathering drawing speed transducing signal and liquid heat-conducting medium temperature sensor signal, the heating process of recirculation heater is controlled, thereby realized coating temperature auto control and adjustment process in the optical fiber applicator.
Press such scheme, described processing and control element (PCE) is the PLC unit, and the PLC unit is provided with drawing speed and liquid heat-conducting medium vs. temperature program, realizes that through the PLC programmed control heating of recirculation heater is regulated with the variation of drawing speed automatically.
Press such scheme, the automatic range of adjustment of described recirculation heater liquid towards heat-conducting medium temperature is 25 ~ 100 ℃.
Press such scheme, described liquid heat-conducting medium is water, mineral oil or other fluent meterial.
Press such scheme, described optical fiber coating method is for wetting to wet (wet-on-wet) coating method or wet to doing (wet-on-dry) coating method.
Press such scheme, the type of heating of described recirculation heater is an Electric heating.
Press such scheme, described PLC program is 0 ~ 3000m/min to the setting range of drawing speed of optical fiber.
The technical scheme of coating automatic temperature control of the present invention is: include the optical fiber applicator that the chamber of heating is set; The chamber of heating of optical fiber applicator is connected with recirculation heater through circulating line; Heat chamber, circulating line and recirculation heater fills liquid heat-conducting medium; It is characterized in that being provided with the PLC unit, PLC unit input end joins respectively with drawing speed sensor and liquid heat-conducting medium temperature sensor, and PLC unit output terminal connects with the temperature-control circuit of recirculation heater.
Press such scheme, described drawing speed sensor is arranged on the traction wheel of wire drawing output terminal; Described liquid heat-conducting medium temperature sensor is arranged in the sap cavity of recirculation heater.
Press such scheme, be provided with sap cavity in the described recirculation heater, electric heater unit and liquid heat-conducting medium temperature sensor are set in the sap cavity, recirculation heater also disposes temperature-control circuit.
Press such scheme, described optical fiber applicator and recirculation heater are provided with one or more pairs of.
Beneficial effect of the present invention is: 1, realize the adjusting automatically with drawing speed of recirculation heater temperature through PLC; Thereby realize the adjusting automatically of coating temperature with drawing speed; Reach the matched well of dope viscosity and drawing speed; The mode of automatic adjusting coating temperature so not only can be regulated the viscosity of coating in each coating chamber arbitrarily in the drawing optical fibers process; Thereby reach the thickness proportion and the diameter of convenient each coat of adjustment optical fiber, and can reduce and avoid coating to overflow, applies diameter to exceed standard, apply inhomogeneous and coating interface and the optical fiber that ripple etc. causes occurs and scrap.Thereby the quality that makes the optical fiber surface coat is guaranteed and improves, and further improves the yield rate of optical fiber processing.2, simple in structure, be convenient to implement and promote, improved the automatization level of optical-fiber processing equipment.
Description of drawings
Fig. 1 is the corresponding relation figure of dope viscosity, drawing speed and coating temperature.
Fig. 2 is the drawing optical fibers process synoptic diagram of one embodiment of the invention.
Fig. 3 is the coating automatic temperature control structural representation of one embodiment of the invention.
Embodiment
Further specify embodiments of the invention below in conjunction with accompanying drawing.
As shown in Figure 2; The drawing process of optical fiber comprises: glass preform 15 thermoplastic in fiber drawing furnace 14 forms optical fiber 1; The optical fiber cooling forming is laggard goes into optical fiber applicator 3; The optical fiber applicator by recirculation heater 7 through circulating line with the liquid heat-conducting medium heating temperature control that circulates, the temperature sensor signal of recirculation heater is related with the velocity pick-up signal foundation of traction wheel 11 through PLC unit 10, the temperature control process of recirculation heater directly has influence on the quality of optical fiber coating.Get into solidification equipment 13 after the optical fiber surface painting of coating and carry out coating curing.Optical fiber curing is after traction wheel 11 to take-up reel 12 is accomplished the optical fiber process.
As shown in Figure 3; Present embodiment includes the optical fiber applicator 3 that the chamber 4 of heating is set, and optical fiber applicator middle part is for being equipped with coating 2 in the coating chamber, and optical fiber 1 passes the coating chamber of optical fiber applicator; The chamber of heating of optical fiber applicator is connected with recirculation heater 7 through circulating line 5; Heat chamber, circulating line and recirculation heater fills liquid heat-conducting medium 8, and described liquid heat-conducting medium is a mineral oil, and PLC unit 10 is set; PLC unit input end joins respectively with drawing speed sensor and liquid heat-conducting medium temperature sensor, and described drawing speed sensor is arranged on the traction wheel of wire drawing output terminal 11; Described liquid heat-conducting medium temperature sensor is arranged in the sap cavity of recirculation heater.The output terminal of PLC unit connects with the temperature-control circuit of recirculation heater 6, is provided with sap cavity in the described recirculation heater, and electric heater unit 9 and liquid heat-conducting medium temperature sensor are installed in the sap cavity bottom, recirculation heater configuration temperature-control circuit.Described optical fiber applicator and recirculation heater are provided with a pair of or two pairs.
Coating temperature automatic control process is: recirculation heater liquid towards heat-conducting medium heats; Liquid heat-conducting medium after the heating heats coating through the chamber of heating that circulating line is transported to applicator; Liquid heat-conducting medium after the release heat is back to recirculation heater through circulating line and heats, and liquid heat-conducting medium heats to coating so circularly.The temperature of liquid heat-conducting medium is controlled by temperature-control circuit, and its temperature sensor signal is set up corresponding relation through the velocity pick-up signal of PLC unit and traction wheel, thereby realizes the control automatically with the variation of drawing speed of recirculation heater temperature.
The recirculation heater temperature is as shown in table 1 with the setting of drawing speed in the present embodiment, on the control interface, according to different drawing speed points different recirculation heater temperature spots is set, and can realize the automatic adjusting of recirculation heater temperature with drawing speed.Before wire drawing begins; Speed is zero, and the recirculation heater temperature is 50 ℃, when drawing speed rises to 600m/min gradually; The recirculation heater temperature rises to 52 ℃ by 50 ℃ automatically gradually, and the recirculation heater temperature of back with the automatic adjusting of drawing speed by that analogy.
Therefore, coating temperature (or viscosity) has good matching relationship with drawing speed, and is as shown in Figure 1.
Table 1
| Drawing speed (m/min) | The setting of recirculation heater temperature (℃) |
| 0 | 50 |
| 600 | 52 |
| 800 | 54 |
| 1000 | 57 |
| 1200 | 61 |
| 1400 | 63 |
| 1500 | 65 |
| 1600 | 67 |
| 1700 | 69 |
| 1800 | 71 |
Claims (10)
1. optical fiber coatings temperature autocontrol method; Include the optical fiber applicator that the chamber of heating is set; The chamber of heating of optical fiber applicator is connected with recirculation heater through circulating line; Heat chamber, circulating line and recirculation heater fills liquid heat-conducting medium; Recirculation heater is heated to the coating in the optical fiber applicator through the circulation heating of liquid towards heat-conducting medium, it is characterized in that being provided with processing and control element (PCE), and processing and control element (PCE) is compared with preset parameter values through gathering drawing speed transducing signal and liquid heat-conducting medium temperature sensor signal; Heating process to recirculation heater is controlled, thereby realizes coating temperature auto control and adjustment process in the optical fiber applicator.
2. by the described optical fiber coatings temperature of claim 1 autocontrol method; It is characterized in that described processing and control element (PCE) is the PLC unit; The PLC unit is provided with drawing speed and liquid heat-conducting medium vs. temperature program, realizes that through the PLC programmed control heating of recirculation heater is regulated with the variation of drawing speed automatically.
3. by claim 1 or 2 described optical fiber coatings temperature autocontrol methods, it is characterized in that the automatic range of adjustment of described recirculation heater liquid towards heat-conducting medium temperature is 25-100 ℃.
4. by claim 1 or 2 described optical fiber coatings temperature autocontrol methods, it is characterized in that described liquid heat-conducting medium is water, mineral oil or other fluent meterial.
5. by claim 1 or 2 described optical fiber coatings temperature autocontrol methods, it is characterized in that described optical fiber coating method is for wetting to wet coating method or wet to the dry-coated mode of covering.
6. by the described optical fiber coatings temperature of claim 2 autocontrol method, it is characterized in that described PLC program is 0 ~ 3000m/min to the setting range of drawing speed of optical fiber.
7. optical fiber coatings automatic temperature control; Include the optical fiber applicator that the chamber of heating is set; The chamber of heating of optical fiber applicator is connected with recirculation heater through circulating line, and the chamber of heating, circulating line and recirculation heater fill liquid heat-conducting medium, it is characterized in that being provided with the PLC unit; PLC unit input end joins respectively with drawing speed sensor and liquid heat-conducting medium temperature sensor, and PLC unit output terminal connects with the temperature-control circuit of recirculation heater.
8. by the described optical fiber coatings temperature of claim 7 autocontrol method, it is characterized in that described drawing speed sensor is arranged on the traction wheel of wire drawing output terminal; Described liquid heat-conducting medium temperature sensor is arranged in the sap cavity of recirculation heater.
9. by claim 7 or 8 described optical fiber coatings temperature autocontrol methods, it is characterized in that being provided with sap cavity in the described recirculation heater, electric heater unit and liquid heat-conducting medium temperature sensor are set in the sap cavity, recirculation heater also disposes temperature-control circuit.
10. by claim 7 or 8 described optical fiber coatings temperature autocontrol methods, it is characterized in that described optical fiber applicator and recirculation heater are provided with one or more pairs of.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210200665.8A CN102759910B (en) | 2012-06-18 | 2012-06-18 | Automatic temperature control method and device for optical fiber coating |
| AP2015008191A AP2015008191A0 (en) | 2012-06-18 | 2013-06-17 | Method and device for automatically controlling temperature of optical fiber coatings |
| PCT/CN2013/077317 WO2013189262A1 (en) | 2012-06-18 | 2013-06-17 | Method and device for automatically controlling temperature of optical fiber coatings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210200665.8A CN102759910B (en) | 2012-06-18 | 2012-06-18 | Automatic temperature control method and device for optical fiber coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102759910A true CN102759910A (en) | 2012-10-31 |
| CN102759910B CN102759910B (en) | 2014-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210200665.8A Active CN102759910B (en) | 2012-06-18 | 2012-06-18 | Automatic temperature control method and device for optical fiber coating |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN102759910B (en) |
| AP (1) | AP2015008191A0 (en) |
| WO (1) | WO2013189262A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013189262A1 (en) * | 2012-06-18 | 2013-12-27 | 长飞光纤光缆有限公司 | Method and device for automatically controlling temperature of optical fiber coatings |
| CN103699050A (en) * | 2013-12-17 | 2014-04-02 | 中天科技光纤有限公司 | Automatic control system and control method for coating diameter of optical fiber |
| CN104019371A (en) * | 2014-04-10 | 2014-09-03 | 上海金自天正信息技术有限公司 | Coating system |
| CN104503517A (en) * | 2014-11-27 | 2015-04-08 | 宝钢工程技术集团有限公司 | Cold-rolling color-coating paint viscosity automatic control system |
| CN108525962A (en) * | 2018-04-28 | 2018-09-14 | 广东电网有限责任公司 | A kind of cable talcum powder applying device |
| CN109836054A (en) * | 2017-11-29 | 2019-06-04 | 住友电气工业株式会社 | The manufacturing method of optical fiber resin coating device and optical fiber |
| CN110047784A (en) * | 2019-04-19 | 2019-07-23 | 湖南新锐微电子科技有限公司 | A kind of semiconductor cutting laser sliver apparatus and its splinter method |
| CN110560325A (en) * | 2019-07-31 | 2019-12-13 | 黄诚 | Cable spraying equipment |
| US12022938B2 (en) | 2006-05-11 | 2024-07-02 | Darren Levy | Multi-head artist and make-up brush |
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| CN100427296C (en) * | 2005-09-23 | 2008-10-22 | 清华大学 | Polymer photon crystal fiber drawing tower control system and method |
| CN102718414B (en) * | 2012-06-18 | 2015-03-04 | 长飞光纤光缆股份有限公司 | Method and device for automatically controlling temperature of optical fiber coatings in wiredrawing process |
| CN102759910B (en) * | 2012-06-18 | 2014-08-20 | 长飞光纤光缆股份有限公司 | Automatic temperature control method and device for optical fiber coating |
-
2012
- 2012-06-18 CN CN201210200665.8A patent/CN102759910B/en active Active
-
2013
- 2013-06-17 WO PCT/CN2013/077317 patent/WO2013189262A1/en active Application Filing
- 2013-06-17 AP AP2015008191A patent/AP2015008191A0/en unknown
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| CN1029324C (en) * | 1989-07-31 | 1995-07-12 | 美国电话及电报公司 | Measuring and controlling thickness of coating on elongated article |
| JPH08337443A (en) * | 1995-06-12 | 1996-12-24 | Yazaki Corp | Method for coloring optical fiber and device for coloring optical fiber |
| CN1350509A (en) * | 1999-05-27 | 2002-05-22 | 住友电气工业株式会社 | Production device and method for optical fiber |
| JP2003335543A (en) * | 2002-05-16 | 2003-11-25 | Sumitomo Electric Ind Ltd | Method and apparatus for drawing optical fiber |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12022938B2 (en) | 2006-05-11 | 2024-07-02 | Darren Levy | Multi-head artist and make-up brush |
| WO2013189262A1 (en) * | 2012-06-18 | 2013-12-27 | 长飞光纤光缆有限公司 | Method and device for automatically controlling temperature of optical fiber coatings |
| CN103699050A (en) * | 2013-12-17 | 2014-04-02 | 中天科技光纤有限公司 | Automatic control system and control method for coating diameter of optical fiber |
| CN103699050B (en) * | 2013-12-17 | 2016-06-29 | 中天科技光纤有限公司 | A kind of fibre coating diameter automatic control system and control method thereof |
| CN104019371A (en) * | 2014-04-10 | 2014-09-03 | 上海金自天正信息技术有限公司 | Coating system |
| CN104019371B (en) * | 2014-04-10 | 2016-08-17 | 上海金自天正信息技术有限公司 | coating system |
| CN104503517B (en) * | 2014-11-27 | 2017-02-22 | 宝钢工程技术集团有限公司 | Cold-rolling color-coating paint viscosity automatic control system |
| CN104503517A (en) * | 2014-11-27 | 2015-04-08 | 宝钢工程技术集团有限公司 | Cold-rolling color-coating paint viscosity automatic control system |
| CN109836054A (en) * | 2017-11-29 | 2019-06-04 | 住友电气工业株式会社 | The manufacturing method of optical fiber resin coating device and optical fiber |
| CN109836054B (en) * | 2017-11-29 | 2022-10-28 | 住友电气工业株式会社 | Resin coating device for optical fiber and method for manufacturing optical fiber |
| CN108525962A (en) * | 2018-04-28 | 2018-09-14 | 广东电网有限责任公司 | A kind of cable talcum powder applying device |
| CN110047784A (en) * | 2019-04-19 | 2019-07-23 | 湖南新锐微电子科技有限公司 | A kind of semiconductor cutting laser sliver apparatus and its splinter method |
| CN110047784B (en) * | 2019-04-19 | 2024-05-28 | 湖南新锐微电子科技有限公司 | Laser splitting device for semiconductor cutting and splitting method thereof |
| CN110560325A (en) * | 2019-07-31 | 2019-12-13 | 黄诚 | Cable spraying equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013189262A1 (en) | 2013-12-27 |
| AP2015008191A0 (en) | 2015-01-31 |
| CN102759910B (en) | 2014-08-20 |
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Address after: 430073 Hubei city of Wuhan province Wuchang two Guanshan Road No. four Applicant after: Yangtze Optical Fibre and Cable Co., Ltd Address before: 430073 Hubei city of Wuhan province Wuchang two Guanshan Road No. four Applicant before: Changfei Fibre-Optical & Optical Cable Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: CHANGFEI FIBRE-OPTICAL + OPTICAL CABLE CO., LTD. TO: YANGTZE OPTICAL FIBRE AND CABLE CO., LTD |
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Effective date of registration: 20170302 Address after: 433100 Qianjiang city of Hubei Province in Jianghan Salt Chemical Industrial Park Road No. 1 special YOFC Patentee after: Qianjiang Changfei Optical Fiber Co. Ltd. Address before: 430073 Hubei city of Wuhan province Wuchang two Guanshan Road No. four Patentee before: Yangtze Optical Fibre and Cable Co., Ltd |