CN203561263U - Oblique-fin finned tube - Google Patents
Oblique-fin finned tube Download PDFInfo
- Publication number
- CN203561263U CN203561263U CN201320742747.5U CN201320742747U CN203561263U CN 203561263 U CN203561263 U CN 203561263U CN 201320742747 U CN201320742747 U CN 201320742747U CN 203561263 U CN203561263 U CN 203561263U
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- China
- Prior art keywords
- fin
- base tube
- tube
- oblique
- finned tube
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- 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
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- 239000002131 composite material Substances 0.000 claims description 6
- 240000007817 Olea europaea Species 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 17
- 239000000428 dust Substances 0.000 abstract description 9
- 238000007664 blowing Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- 238000010408 sweeping Methods 0.000 abstract 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 13
- 239000002956 ash Substances 0.000 description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 11
- 239000003546 flue gas Substances 0.000 description 11
- 238000012423 maintenance Methods 0.000 description 9
- 238000012546 transfer Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009740 moulding (composite fabrication) Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003094 perturbing effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Abstract
The utility model discloses an oblique-fin finned tube. Each fin body comprises an oblique face and a fin center hole formed in the inner side of the oblique face, and the multiple fin bodies are arranged continuously or at intervals in a surrounding mode in the axial direction of a base tube oblique on the outer wall face of the base tube; or each fin body comprises an umbrella-shaped body and a fin center hole formed in the middle portion of the umbrella-shaped body, and the fin bodies are tightly combined on the outer wall face of the base tube through the fin center holes in a sleeved mode; or each fin body comprises an oblique annular face fin and a folding side arranged at the end of the oblique annular face fin, and the oblique annular face fin is arranged on the outer wall face of the base tube in a sleeved mode through an inner ring sleeve of the oblique annular face fin and is tightly connected with the outer wall face of the base tube. After the oblique-fin finned tube is used, smoke ash or air dust falls down from the fin oblique faces and cannot be accumulated, so that scale prevention effect is good, accordingly, the fact that heat exchanging effect is durable and stable is guaranteed, the problems of frequent halt due to heat exchanger dust removing can be reduced or avoided, operation maintaining of fin ash blowing and sweeping can be reduced or avoided, and meanwhile the oblique-fin finned tube has the advantages of being simple in structure, and the service life of the finned tube is prolonged.
Description
Technical field
The application relates to the heat transmission equipment technical field in the industries such as air-conditioning, chemical industry, petrochemical industry, electric power energy, smelting iron and steel, particularly relates to a kind of oblique wing finned tube.
Background technology
Spiral finned heat exchanger comprises various heating furnaces, finned tube preheater and air cooler etc., is one of widely used heat exchanger, and its design and manufacture technical maturity is safe, is crucial energy-saving equipment in heat transmission equipment.People utilize spiral fin coil aspect the enhanced heat exchange of heat exchanger, obtaining certain effect, are therefore satisfied with and are fruitful, and for a long time, the structure of spiral fin coil is never improved further.
(1) structure function of conventional helical finned tube.
At present, the spiral fin coil that the device heat exchanges such as domestic petroleum chemical industry are used is all straight tube, the fin of this finned tube is mostly wound around and is soldered on base tube by alternating-current resistance electrode holder steel disc band, requirement fin must be perpendicular to base tube surface, 5.2.3 clause regulation in standard SH/T3415-2005 < < high-frequency resistance welding (HFRW) spiral fin coil > >, the angle of pitch of fin should be not more than 10 °, 5.4.5 clause regulation in standard HG/T 3181-2009 < < high-frequency resistance welding (HFRW) spiral fin coil > >, the angle of pitch of fin should be not more than 8 °, otherwise, be regarded as defective work.
Many finned tubes are come together, and its two ends are injected respectively in the pore of tube sheet and weldering mutually with it, to form a tube bank.A kind of medium flows through in the base tube of tube bank, and another kind of medium flows through outward at the pipe of tube bank, and in pipe, medium and the outer medium of pipe are by tube wall generation heat exchange.
(2) problem that conventional helical finned tube exchanger exists.
Development along with device technique technology; it is more and more that finned tube is erect the occasion of installing and using; because traditional fin is to be basically perpendicular to base tube surface to install; so when finned tube exchanger is erect installation; originally the fin plane that was basically perpendicular to base tube surface has just become to approach the direction of horizontal plane; this structure is in service for a long time; dust or the airborne dust of managing in outer flue gas accumulate in the plane of fin; form dirt; be difficult to remove; in pipe, outside medium and pipe, between flue gas, form thermal resistance, affect heat exchange efficiency.The finned tube that the problems referred to above appear in finned tube exchanger is erect while installing, if traditional level is installed and used pattern, there are not the problems referred to above, or the problems referred to above are very little, be easy to rinse out by soot blower or water jets, yet, for setting, install and use pattern and produce larger problem and need solution badly.
To sum up, when finned tube setting is installed and used, the fin structure design of finned tube be avoid of dirt accumulation fouling most important, the link of most critical, if fin structure is not innovated to prevent original problem existing, tend to cause heat exchanger not reach design effect.
Summary of the invention
The application's object be to avoid above-mentioned weak point of the prior art and a kind of heat exchange is provided and antiscaling effect good, and simple in structure, can extend the finned tube oblique wing finned tube in service life.
The application's object is achieved through the following technical solutions:
providea kind of oblique wing finned tube, several fin body that include base tube and be arranged at described base tube, wherein, the fin centre bore that described fin body comprises inclined plane and is arranged at inner side, described inclined plane, described fin centre bore is closely connected with the outside wall surface of described base tube, and described several fin body arrange or are interrupted around setting in the outside wall surface continued circling of base tube along the axioversion of described base tube.
wherein,described inclined plane and described base tube radially between inclination angle be set to 20 degree to 60 degree.
wherein,described inclined plane be shaped as cambered surface, described fin centre bore is arranged at the string side of described cambered surface.
also providea kind of oblique wing finned tube, several fin body that include base tube and be arranged at described base tube, wherein, the fin centre bore that described fin body comprises umbrella body and is arranged at described umbrella body middle part, described fin body is closely sleeved on the outside wall surface of described base tube by described fin centre bore.
wherein,inclination angle between at the bottom of the umbrella cover of described umbrella body and umbrella is set to 20 degree to 60 degree.
also providea kind of oblique wing finned tube, several fin body that include base tube and be arranged at described base tube, wherein, the flanging that described fin body comprises inclination anchor ring fin and is arranged at described inclination anchor ring fin end, described inclination anchor ring fin is located at the outside wall surface of described base tube and is closely connected with the outside wall surface of described base tube by its inner ring sleeve.
wherein,described base tube is provided with the locating piece with inclined plane.
above-mentionedbetween a kind of described base tube of oblique wing finned tube and described fin body, be provided with the composite bed of the roll forming of the outside wall surface that is sleeved on described base tube.
above-mentioneda kind of outward flange of described fin body of oblique wing finned tube offers opening.
above-mentioneda kind of cross section of described base tube of oblique wing finned tube is set to any in Long Circle, oblateness and olive shape.
The application's beneficial effect:
The application's a kind of oblique wing finned tube, compared with prior art, adopt innovative fin structure, broken through this area conventional thought simultaneously, the fin of having abandoned finned tube must be perpendicular to the set-up mode on base tube surface, and its angle of pitch need be strict controlled in 10 degree has technological means with interior being used to, after use, make flue gas ashes or dirt in air can be from fin inclined-plane landing and cannot gathering, thereby make the good maintenance of antiscaling effect heat transfer effect effectively steady in a long-term, can reduce or avoid because removing the frequent shutdown of heat exchanger dust and the Operation and Maintenance that purges fin ashes, also have simple in structure simultaneously, extend the finned tube feature in service life.
Accompanying drawing explanation
Utilize accompanying drawing to be described further the application, but embodiment in accompanying drawing does not form any restriction to the application, for those of ordinary skill in the art, is not paying under the prerequisite of creative work, can also obtain according to the following drawings other accompanying drawing.
Fig. 1 is the first structural representation of embodiment 1 of the application's a kind of oblique wing finned tube.
Fig. 2 is the second structural representation of embodiment 1 of the application's a kind of oblique wing finned tube.
Fig. 3 is the 3rd structural representation of embodiment 1 of the application's a kind of oblique wing finned tube.
Fig. 4 is the first structural representation of embodiment 2 of the application's a kind of oblique wing finned tube.
Fig. 5 is the second structural representation of embodiment 2 of the application's a kind of oblique wing finned tube.
Fig. 6 is the third structural representation of embodiment 2 of the application's a kind of oblique wing finned tube.
Fig. 7 is the first structural representation of embodiment 3 of the application's a kind of oblique wing finned tube.
Fig. 8 is the second structural representation of embodiment 3 of the application's a kind of oblique wing finned tube.
Fig. 9 is wherein a kind of structural representation of embodiment 4 of the application's a kind of oblique wing finned tube.
Figure 10 is wherein a kind of structural representation of embodiment 5 of the application's a kind of oblique wing finned tube.
In Fig. 1 to Figure 10, include:
The specific embodiment
With the following Examples the application is further described.
One of specific embodiment of the application's a kind of oblique wing finned tube, shown in Figure 1, several fin body 1 that include base tube 2 and be arranged at described base tube 2, wherein, the fin centre bore that described fin body 1 comprises inclined plane and is arranged at inner side, described inclined plane, described fin centre bore is closely connected with the outside wall surface of described base tube 2, and described several fin body 1 arrange (as shown in Figure 2) or are interrupted around (as shown in Figure 3) is set in the outside wall surface continued circling of base tube 2 along the axioversion of described base tube 2.Interruption can isometric setting or not isometric setting around the distance between each fin body 1 in arranging, and depending on concrete operating condition, the not isometric interruption of normal conditions is around the heat exchange efficiency that is more conducive to improve finned tube.This structure make flue gas ashes or dirt in air can be from the inclined plane of fin landing and cannot gathering; thereby make the good maintenance of antiscaling effect heat transfer effect effectively steady in a long-term; can reduce or avoid because removing the frequent shutdown of heat exchanger dust and the Operation and Maintenance that purges fin ashes, also have simultaneously simple in structure, extend the finned tube feature in service life.
Separately, according to base tube 2, around the actual conditions that are combined into finned tube, close-connected mode can select machinery welding or tight fit fit to connect.
Concrete, described inclined plane and described base tube 2 radially between inclination angle be set to 20 degree to 60 degree.Be conducive to the landing of flue gas ashes or dirt in air.
Concrete, described inclined plane be shaped as cambered surface, described fin centre bore is arranged at the string side of described cambered surface.This cambered surface can be semicircle or be greater than the fan-shaped of semicircle, and fin centre bore is closely connected in the outside wall surface of base tube 2.The inclined plane of this cambered surface arranges all and can form turbulence effect as fin body 1 continued circling setting or interruption, thereby further improves the heat exchange efficiency of finned tube.
Separately, the thickness on the inclined plane in this each fin body 1, for what change, from top to bottom by thick attenuation, is conducive to the quick landing of flue gas ashes or dirt in air.
Two of the specific embodiment of the application's a kind of oblique wing finned tube, shown in Figure 4, several fin body 1 that include base tube 2 and be arranged at described base tube 2, wherein, the fin centre bore that described fin body 1 comprises umbrella body and is arranged at described umbrella body middle part, described fin body is closely sleeved on the outside wall surface of described base tube 2 by described fin centre bore.This fin body 1 is from pipe end, to pierce into base tube and assemble and coordinate independently one by one.This structure make flue gas ashes or dirt in air can be from the inclination umbrella cover of the umbrella body of fin landing and cannot gathering; thereby make the good maintenance of antiscaling effect heat transfer effect effectively steady in a long-term; can reduce or avoid because removing the frequent shutdown of heat exchanger dust and the Operation and Maintenance that purges fin ashes, also have simultaneously simple in structure, extend the finned tube feature in service life.
Concrete, the inclination angle between at the bottom of the umbrella cover of described umbrella body and umbrella is set to 20 degree to 60 degree.Be conducive to the landing of flue gas ashes or dirt in air.
Shown in Fig. 5 and Fig. 6, this umbrella body is provided with fin lap segment 6 along the circumferencial direction of base tube 2, is conducive to fin body 1 when being fit into base tube 2, and the expansion of fin centre bore can be guaranteed easily to pierce in base tube 2.This umbrella body is along the axial direction of base tube 2 simultaneously, be provided with and the integrated fin shrinking section 7 of fin body 1, be convenient to the mutual location between fin body 1 and base tube 2, the height of this fin shrinking section 7 also can guarantee the gap between each fin body 1 simultaneously.
embodiment 3
Three of the specific embodiment of the application's a kind of oblique wing finned tube, shown in Fig. 7 and Fig. 8, several fin body 1 that include base tube 2 and be arranged at described base tube 2, wherein, the flanging 8 that described fin body 1 comprises inclination anchor ring fin and is arranged at described inclination anchor ring fin end, described inclination anchor ring fin is located at the outside wall surface of described base tube 2 and is closely connected with the outside wall surface of described base tube 2 by its inner ring sleeve.Flanging 8 can upwards arrange, and also can arrange downwards.This inclination anchor ring fin torus shape can be for having the annular shape of trapezoid cross section, also can be for thering is the annular shape of triangular-section, and said structure is more conducive to the landing of flue gas ashes or dirt in air.
This structure make flue gas ashes or dirt in air can be from the inclination umbrella cover of the umbrella body of fin landing and cannot gathering; thereby make the good maintenance of antiscaling effect heat transfer effect effectively steady in a long-term; can reduce or avoid because removing the frequent shutdown of heat exchanger dust and the Operation and Maintenance that purges fin ashes, also have simultaneously simple in structure, extend the finned tube feature in service life.
Concrete, described base tube 2 is provided with the locating piece 3 with inclined plane.Locating piece 3 can be directly welded in the outside wall surface of base tube 2.
This inclination anchor ring fin is from pipe end, to pierce into base tube 2 independently one by one, the flanging 8 of inclination anchor ring fin end has the effect that can mutually withstand when several inclination anchor ring fins are superimposed together and play maintenance gap, the locating piece 3 with inclined plane plays the effect that keeps inclination angle, make this inclination angle can be between 20 degree to 60 degree, thereby be beneficial to the landing of flue gas ashes or dirt in air.
embodiment 4
Four of the specific embodiment of the application's a kind of oblique wing finned tube, as shown in Figure 9, the main technical schemes of the present embodiment is with in embodiment 1 to embodiment 3, any is identical, in the present embodiment unaccounted feature, adopt the explanation in any one in embodiment 1 to 3, at this, no longer repeat.In the present embodiment and embodiment 1 to embodiment 3, any difference is: the composite bed that is provided with the roll forming of the outside wall surface that is sleeved on described base tube 2 between described base tube 2 and described fin body 1, this composite bed can be for being linked in the composite construction of bushing pipe 4 roll formings of the another kind of material on base tube 2, base tube 2 and rolling go out the material of fin body 1 can be different, be conducive to utilize respectively the premium properties of different materials, for example, the corrosion of medium in base tube 2 abilities but the corrosion of the outer medium of not resistance to pipe, otherwise, the corrosion of the outer medium of the material ability of fin body 1 but the corrosion of medium in not resistance to pipe.Composite bed is set and is more conducive to the different demands that interior medium and the outer medium of pipe are managed in reply flexibly, be also convenient to the assembling of fin simultaneously.
embodiment 5
Five of the specific embodiment of the application's a kind of oblique wing finned tube, as shown in figure 10, the main technical schemes of the present embodiment is with in embodiment 1 to embodiment 3, any is identical, in the present embodiment unaccounted feature, adopt the explanation in any one in embodiment 1 to 3, at this, no longer repeat.In the present embodiment and embodiment 1 to embodiment 3, any difference is: the outward flange of described fin body 1 offers opening 5, opening 5 can guide air-flow to increase perturbing of dust made to its difficult calmness, improve heat transfer effect, opening 5 just processes before fin body 1 and base tube 2 combine, can cut various openings 5 by punching press or roll extrusion, the shape of opening 5 can be any in V-arrangement, U-shaped and O shape.
Six of the specific embodiment of the application's a kind of oblique wing finned tube, the main technical schemes of the present embodiment is with in embodiment 1 to embodiment 3, any is identical, unaccounted feature, adopts the explanation in any one in embodiment 1 to 3 in the present embodiment, at this, no longer repeats.In the present embodiment and embodiment 1 to embodiment 3, any difference is: the cross section of described base tube 2 is set to any in Long Circle, oblateness and olive shape.Separately, base tube 2 can also be set to warp architecture.
Finally should be noted that; above embodiment is only in order to illustrate the application's technical scheme; but not restriction to the application's protection domain; although the application has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the application's technical scheme, and not depart from essence and the scope of present techniques scheme.
Claims (10)
1. an oblique wing finned tube, several fin body that include base tube and be arranged at described base tube, it is characterized in that: the fin centre bore that described fin body comprises inclined plane and is arranged at inner side, described inclined plane, described fin centre bore is closely connected with the outside wall surface of described base tube, and described several fin body arrange or are interrupted around setting in the outside wall surface continued circling of base tube along the axioversion of described base tube.
2. a kind of oblique wing finned tube according to claim 1, is characterized in that: described inclined plane and described base tube radially between inclination angle be set to 20 degree to 60 degree.
3. a kind of oblique wing finned tube according to claim 1, is characterized in that: described inclined plane be shaped as cambered surface, described fin centre bore is arranged at the string side of described cambered surface.
4. an oblique wing finned tube, several fin body that include base tube and be arranged at described base tube, it is characterized in that: the fin centre bore that described fin body comprises umbrella body and is arranged at described umbrella body middle part, described fin body is closely sleeved on the outside wall surface of described base tube by described fin centre bore.
5. a kind of oblique wing finned tube according to claim 4, is characterized in that: the inclination angle between at the bottom of the umbrella cover of described umbrella body and umbrella is set to 20 degree to 60 degree.
6. an oblique wing finned tube, several fin body that include base tube and be arranged at described base tube, it is characterized in that: the flanging that described fin body comprises inclination anchor ring fin and is arranged at described inclination anchor ring fin end, described inclination anchor ring fin is located at the outside wall surface of described base tube and is closely connected with the outside wall surface of described base tube by its inner ring sleeve.
7. a kind of oblique wing finned tube according to claim 6, is characterized in that: described base tube is provided with the locating piece with inclined plane.
8. according to a kind of oblique wing finned tube described in claim 1 or 4 or 6, it is characterized in that: the composite bed that is provided with the roll forming of the outside wall surface that is sleeved on described base tube between described base tube and described fin body.
9. according to a kind of oblique wing finned tube described in claim 1 or 4 or 6, it is characterized in that: the outward flange of described fin body offers opening.
10. according to a kind of oblique wing finned tube described in claim 1 or 4 or 6, it is characterized in that: the cross section of described base tube is set to any in Long Circle, oblateness and olive shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320742747.5U CN203561263U (en) | 2013-11-22 | 2013-11-22 | Oblique-fin finned tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320742747.5U CN203561263U (en) | 2013-11-22 | 2013-11-22 | Oblique-fin finned tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203561263U true CN203561263U (en) | 2014-04-23 |
Family
ID=50510979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320742747.5U Expired - Lifetime CN203561263U (en) | 2013-11-22 | 2013-11-22 | Oblique-fin finned tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203561263U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103557736A (en) * | 2013-11-22 | 2014-02-05 | 茂名重力石化机械制造有限公司 | Slant finned tube |
| CN104006693A (en) * | 2014-05-06 | 2014-08-27 | 北京理工大学 | Opposite-rounded-corner oblique-breaking-type finned tube non-contact thermal resistance heat transmission element |
| CN104165539A (en) * | 2014-08-01 | 2014-11-26 | 苏州威尔博机械有限公司 | Spiral fin |
-
2013
- 2013-11-22 CN CN201320742747.5U patent/CN203561263U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103557736A (en) * | 2013-11-22 | 2014-02-05 | 茂名重力石化机械制造有限公司 | Slant finned tube |
| CN103557736B (en) * | 2013-11-22 | 2016-02-03 | 茂名重力石化机械制造有限公司 | A kind of tiltedly wing finned tube |
| CN104006693A (en) * | 2014-05-06 | 2014-08-27 | 北京理工大学 | Opposite-rounded-corner oblique-breaking-type finned tube non-contact thermal resistance heat transmission element |
| CN104165539A (en) * | 2014-08-01 | 2014-11-26 | 苏州威尔博机械有限公司 | Spiral fin |
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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 | ||
| CP03 | Change of name, title or address |
Address after: 525024 Guangdong City, Maoming Province Ring West Road, No. 91 Patentee after: THE CHALLENGE PETROCHEMICAL MACHINERY Corp. Address before: 525024 Maoming City, Guangdong Province West Road, Maoming City, the gravity of the Petrochemical Machinery Manufacturing Co., Ltd., Patentee before: THE CHALLENGE PETROCHEMICAL MACHINERY Corp. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140423 |