CN202119482U - Calorific value correcting diaphragm gas meter - Google Patents
Calorific value correcting diaphragm gas meter Download PDFInfo
- Publication number
- CN202119482U CN202119482U CN 201120201810 CN201120201810U CN202119482U CN 202119482 U CN202119482 U CN 202119482U CN 201120201810 CN201120201810 CN 201120201810 CN 201120201810 U CN201120201810 U CN 201120201810U CN 202119482 U CN202119482 U CN 202119482U
- Authority
- CN
- China
- Prior art keywords
- diaphragm
- gas meter
- gas
- distribution valve
- calorific value
- 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
Images
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model discloses a calorific value correcting diaphragm gas meter belonging to the diaphragm gas meter and comprising a diaphragm box (1) and a gas distribution valve bank, wherein at least two metering chambers (2) are included in the diaphragm box (1); each metering chamber (2) is divided by a face diaphragm (3) into two independent metering cavities; the gas distribution valve bank comprises a gas distribution valve seat and a distribution valve cover (4); an inlet/exhaust port and a closing port are formed on each of the gas distribution valve seat and the distribution valve cover (4); a volute spiral spring made of two metal precision alloy materials different in coefficients of thermal expansion drives a crank slider to slide within a slide rail on a center wheel when the temperature is increased or reduced, thereby changing the radius of a crank; therefore, the motion trajectory of a crank link mechanism driving a face diaphragm clamping plate is changed so that the stretching size of the face diaphragm is changed. The calorific value correcting diaphragm gas meter provided in the utility model is simple in structure and can be formed by changing the diaphragm gas meter of the existing structure; and the diaphragm gas meter is suitable for industrial production and easy to popularize.
Description
Technical field
The utility model relates to a kind of diaphragm gas meter, a kind of calorific value amendment type diaphragm gas meter of saying so more specifically.
Background technology
Diaphragm gas meter is a kind of gas meter that is widely used; Have that the accuracy of measuring is higher, broad quantum, stable performance, technology be easy to control, cost performance advantages of higher; But the calibrating of existing diaphragm gas meter is accomplished down for 20 ± 2 ℃ at constant temperature, and the transaction temperature of regulation also is this temperature.And the operating ambient temperature of actual gas meter, flow meter is constantly to change; Even what therefore gas meter, flow meter showed is also not necessarily identical with the long-pending identical calorific value of gas, caused the uncertainty of diaphragm gas meter caloricity gaging, just because of the existence of this defective; Therefore traditional mechanical diaphragm gas meter is replaced by the electronic gas table gradually; Electronic gas table metering accurately, also intelligence comparatively in actual use can satisfy the daily required gas demand of using; But the manufacturing cost of electronic gas table is higher, therefore it is popularized and causes certain obstruction.
And since the gaseous tension of registering one's residence of gas company through the voltage adjusting device pressure regulation, the pressure that passes through gas meter, flow meter is tending towards constant, according to gay lussacs law: V
t=V
T[1+a (t-T)] can know the gas of certain mass, and temperature and volume were proportional when pressure was constant.For realizing gas company and user's interests equality; Be necessary the mechanical diaphragm gas meter of existing structure is made improvement; Solve the calorific value correction problem of mechanical diaphragm gas meter under the varying environment, to reduce of the influence of environment for use temperature to being caused on the gas meter, flow meter tally function.
The utility model content
The purpose of the utility model is to solve above-mentioned deficiency, under the situation by any electronic equipment not, a kind of calorific value amendment type diaphragm gas meter of mechanical passive continuous calorific value correction is provided.
For solving above-mentioned technical matters, the utility model adopts following technical scheme:
The utility model provides a kind of calorific value amendment type diaphragm gas meter; Comprise movement, gearing, counting assembly and housing; Wherein movement comprises bellows and gas distributing valve group, comprises at least two measuring rooms in the bellows, and each measuring room is divided into two by epithelium and independently measures cavity; Described gas distributing valve group comprises gas distributing valve valve seat and distribution valve valve gap; Be provided with porting and close opening on gas distributing valve valve seat and the distribution valve valve gap, and the distribution valve valve gap is installed in center-wheel arbor downwards with the form that can rotate synchronously, centre wheel is installed on the axis; Combustion gas is discharged by gas outlet via distribution valve valve seat and distribution valve valve gap after getting into the metering cavity via distribution valve valve gap, gas distributing valve valve seat successively again; Epithelium clamping plate in the described measuring room are movably connected on respectively on the end of toggle; Described centre wheel also links to each other with counting assembly through gearing; The calorific value correcting device is installed on the described centre wheel; At least comprise crank block in the calorific value correcting device, and centre wheel radially near being provided with the slide rail that is complementary with crank block near its center; The end of described toggle is provided with connecting rod, and an end of connecting rod is movably connected on the crank block; Described gas meter, flow meter is provided with air intake opening and gas outlet, and air intake opening is connected with the porting of distribution valve valve gap, and the gas outlet is connected with gas outlet on the movement.
Above-mentioned technical scheme further is: described calorific value correcting device also comprises scroll spring, and scroll spring is installed near the slide rail of centre wheel, and the free end and the crank block of scroll spring interfix, and stiff end is fixed on the centre wheel.
Technical scheme further is: one section straight line portion all is set on the free end of described scroll spring and the stiff end, and keeps spacing between scroll spring and the crank block.Avoid the volute spring expanded by heating to hinder and go being free to slide of handle slide block.
Technical scheme further is: described scroll spring integral body is the spiral of Archimedes shape, and its xsect is a rectangle.
Technical scheme further is: described scroll spring is to adopt the Precise Alloy of being processed into by two kinds of thermal expansivity different metallic, and its free end can take place clockwise with the height variation of temperature or be rotated counterclockwise.
Technical scheme further is: described toggle is corresponding with the quantity of measuring room in the bellows; Respectively by affecting arm, vertical shaft, rocking bar, connecting rod to constitute; Affect an end of arm to be installed in the chute of epithelium clamping plate, the other end is connected with the vertical shaft lower end, and rocking bar also is fixed on the upper end at vertical shaft; One end of connecting rod matches with rocking bar, and the other end is installed on the crank block.
Technical scheme further is: the measuring room in the said bellows is two, and toggle also is two covers, and an end of the connecting rod in the two cover crank linkage assemblys is all installed on the crank block that is hinged on the centre wheel.
Compared with prior art; The beneficial effect of the utility model is: the Precise Alloy material scroll spring of processing through two kinds of thermal expansivity different metallic; When temperature raises or reduce, driving slides in the slide rail of crank block on centre wheel changes the radius of crank; Change the running orbit that toggle drives the epithelium clamping plate with this, and then change the extension size of epithelium, finally change the size of diaphragm gas meter revolution volume; Make the calorific value of combustion gas of each the revolution volume under the different temperatures identical, reach the purpose of calorific value correction with the calorific value of standard volume.And need not to increase again extra electronic original part; Manufacturing cost is lower, also can in various places, use applied range; A kind of calorific value amendment type diaphragm gas meter that the utility model provided simultaneously is simple in structure; Can directly adopt the diaphragm gas meter of existing structure to reequip, and be suitable for suitability for industrialized production, be easy to promote.
Description of drawings
Fig. 1 is measuring room epithelium and the epithelium clamping plate distributed architecture synoptic diagram in the utility model embodiment
Fig. 2 is the one-piece construction synoptic diagram of the utility model;
Fig. 3 is that the A of Fig. 2 is to synoptic diagram;
Fig. 4 is the structural representation of the calorific value correcting device in the utility model embodiment;
Fig. 5 is that the B of Fig. 4 is to synoptic diagram.
Among the figure, 1 bellows, 2 measuring rooms, 3 epitheliums, 4 distribution valve valve gaps, 5 centre wheels, 51 slide rails, 6 gas outlets, 7 counting assemblys, 8 crank blocks, 9 connecting rods, 10 scroll springs, 11 affect arm, 12 epithelium clamping plate, 13 rocking bars, 14 vertical shafts.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further to set forth.
As shown in Figure 1; A kind of calorific value amendment type diaphragm gas meter that the utility model provided; Comprise gearing, counting assembly, movement and housing, wherein be provided with bellows 1 and gas distributing valve group in the movement, comprise two measuring rooms 2 in the bellows 1; Each measuring room 2 is divided into two by epithelium 3 and independently measures cavity; And also be provided with epithelium clamping plate 12 in 12, two measuring rooms of epithelium clamping plate 2 in two measuring rooms 2 and be individually fixed in two and overlap independently in the toggle, and an end of two cover crank linkage assemblys is all installed on the crank block 8 that is hinged on the centre wheel 5.
Like Fig. 2, shown in Figure 3; Described movement also comprises gas distributing valve valve seat and distribution valve valve gap 4; Be provided with porting and close opening on gas distributing valve valve seat and the distribution valve valve gap 4; Wherein the distribution valve valve seat is provided with four portings; Distribution valve valve gap 4 is provided with exhausr port of an import and two close opening, and distribution valve valve gap 4 is installed in axially below of centre wheel 5 with the form that can rotate synchronously, and centre wheel 5 is fixed on the axis; And can rotate around axis; Combustion gas is discharged by gas outlet 6 through distribution valve valve seat and distribution valve valve gap 4 after getting into four metering cavitys via the porting of the air intake opening of gas distributing valve valve gap 4 and distribution valve valve seat again, and the air inlets in two metering cavitys in the same measuring room 2 are opposite and replace repeatedly with exhaust, and the interior epitheliums 3 drives epithelium clamping plate 12 separately of each measuring room 2 are reciprocating; Epithelium clamping plate 12 in the described measuring room 2 drive the swing that affects arm through the spindle nose that affects arm respectively; And the other end that affects arm in the two cover crank linkage assemblys all is fixed in the lower end of toggle neutral axis 14, and centre wheel 5 drives gas distributing valve valve gap 4 and rotates on the gas distributing valve valve seat around axis, each metering cavity of entering and discharge that combustion gas is replaced; Described centre wheel 5 also links to each other with counting assembly 7 through gearing, on the described centre wheel 5 the calorific value correcting device is installed, and comprises crank block 8 in the calorific value correcting device.
Like Fig. 4, shown in Figure 5, described centre wheel 5 radially near being provided with the slide rail 51 that is complementary with crank block 8 near its center, slide rail 51 is arranged in the radial position on the centre wheel 5, crank block 8 can slide in slide rail 51; Connecting rod 9 is arranged on the end of described toggle, and an end of connecting rod 9 is fixed on the crank block 8, slides on slide rail 51 for cooperating crank block 8; Also can make its radius with variation of temperature adjustment crank and connecting rod movement; Also be provided with scroll spring 10 at the calorific value correcting device, scroll spring 10 is installed near the slide rail 51 of centre wheel 5, and the free end of scroll spring 10 and crank block 8 interfix; Stiff end is fixed on the centre wheel 5; One section straight line portion all is set on the free end of scroll spring 10 and the stiff end, and keeps spacing between scroll spring 10 and the crank block 8, on the fixed form of scroll spring 10 and crank block 8; What adopt in this embodiment is that scroll spring 10 free ends are inserted in the groove that is provided with on the crank block 8; Suitability for guaranteeing that scroll spring 10 inserts preferably scroll spring 10 integral body are the spiral of Archimedes shape, and its xsect is a rectangle simultaneously; For scroll spring 10 can be changed with the height of temperature clockwise or anticlockwise rotation taking place, adopts two kinds of Precise Alloys that the thermal expansivity different metallic is processed into simultaneously on its material.
Fig. 1, shown in Figure 2 for another example; Described toggle is corresponding with the quantity of measuring room 2 in the bellows 1; Respectively by affecting arm 11, vertical shaft 14, rocking bar 13, connecting rod 9 to constitute; Affect arm 11 to have an end of little axle to be installed in the chute of epithelium clamping plate 12, the other end is fixedly connected with the lower end of vertical shaft 14; Rocking bar 13 is fixed on the upper end of vertical shaft 14, and connecting rod 9 two ends have the hole, and the one of which end matches with the spindle nose of rocking bar 13, and the other end is installed on the spindle nose of crank block 8.On the mode that in toggle, flexibly connects each other between the parts, preferably adopt hinged form.
Facility has air intake opening and gas outlet on a kind of calorific value amendment type diaphragm gas meter of the utility model, and air intake opening is connected with the air intake opening of gas distributing valve valve gap 4, and the gas outlet is connected with gas outlet 6 on the movement.
The principle of a kind of calorific value amendment type core of membrane type gas meter that is provided in the present embodiment is following: concrete principle of work is following: advantages such as diaphragm gas meter is reliable with its metering, and steady quality is simple in structure, and is with low cost are used by a large amount of in the whole world.Its measuring principle all is when the measuring room of gas meter, flow meter is passed through in combustion gas; Produce the fluid passage along journey and local pressure loss; Diaphragm gas meter is imported and exported produced pressure reduction, the epithelium that promotes diaphragm gas meter is in the metering indoor sport, and the epithelium of two measuring rooms drives the distribution valve valve gap through linkage and on the distribution valve valve seat, rotates; Coordinate distribution; Make the inside and outside cavity revolution of each measuring room successively suck and discharge the gas of the volume of having one's bosom filled with, realize the automatic operation of movement, the toggle of measuring room epithelium clamping plate and the symmetrical common center wheel of two covers before and after linkage comprises.Rotatablely moving of centre wheel adds up the movement revolution through gear train drive casing external counting device; Movement four the full metering chamber volume of discharging that whenever rotate a circle are the revolution volumes of gas meter, flow meter, and the revolution volume of every diaphragm gas meter is a relatively-stationary parameter.Under the different operating environment, be inequality with the volume fuel gases calorific value under the calorific value of each revolution volume combustion gas and the standard state, therefore, there is the situation that calorific value does not wait in the metering of diaphragm gas meter under the different operating environment temperature.Make diaphragm gas meter fuel gases calorific value that turns round volume of gas meter, flow meter under fuel gases calorific value and the standard conditions of one under different metering temperatures revolution volume identical; Just must make the revolution volume change continuous of gas meter, flow meter, i.e. reducing in proportion when becoming big, temperature drop during temperature rise in proportion with the difference of environment temperature.Realizing the revolution volume simultaneously with the temperature continually varying; Can not influence the characteristics of motion of diaphragm gas meter again; According to being synchronized with the movement of diaphragm gas meter epithelium and valve gap is these characteristics that realize through linkage; Can draw as drawing a conclusion: under the moving condition of the crank and rocker mechanism that the common center that satisfies two cover symmetries is taken turns; Through changing the radius of toggle crank on centre wheel, can change the stroke of epithelium clamping plate in the linkage, thereby change the extension size of movement epithelium and then change the size that diaphragm gas meter turns round volume; Make the calorific value of combustion gas of each the revolution volume under the different temperatures identical, reach the purpose of calorific value correction with the calorific value of standard volume.
Again the element function in the improvement calorific value correcting device of the utility model is done an explanation below:
Centre wheel: be installed on the axis; Both can drive the rotation of distribution valve valve gap; Also can drive the excessively operation of wheel in the gearing, be that the shared crank of common diaphragm gas meter just is fixed on the centre wheel by the shared crank driving of passing through of diaphragm gas meter two cover crank linkage assemblys; Crank length is constant, can be temperature variant during the shared crank length of the utility model.In the mechanism of the utility model, there is one section straight line chute to supply crank block in chute, to slide on the centre-crank wheel wheel and reaches the purpose that changes crank length.
Crank block: joint pin is arranged on the crank block, be used to connect connecting rod, crank block and calorific value compensating element flexibly connect simultaneously, and crank block slides in the slider track of centre-crank wheel with the variation of calorific value compensating element; The center of crank block joint pin and the distance of axis are exactly the effective radius of crank.
Scroll spring: be the spring of processing with thermometal Precise Alloy material that is shaped as plane scroll, it is characterized in that being linear change with the free-ended angular displacement of the variation scrollwork of environment temperature; The stiff end of element and centre wheel are rigidly connected fixing, and element free end and crank block flexibly connect, and free-ended rotation drives crank block and in the chute of centre-crank wheel, slides.
Adopt above-mentioned calorific value correcting device, need not change the structure of existing diaphragm gas meter.Only need rocking bar is suitably heightened, replace the corresponding parts that have diaphragm gas meter now, realize the purpose of calorific value correction with regard to the structure of available such scheme.
Claims (7)
1. calorific value amendment type diaphragm gas meter; Comprise movement, gearing, counting assembly and housing; Wherein movement comprises bellows (1) and gas distributing valve group, comprises at least two measuring rooms (2) in the bellows (1), and each measuring room (2) is divided into two by epithelium (3) and independently measures cavity; Described gas distributing valve group comprises gas distributing valve valve seat and distribution valve valve gap (4); Be provided with porting and close opening on gas distributing valve valve seat and the distribution valve valve gap (4), and distribution valve valve gap (4) is installed in axially below of centre wheel (5) with the form that can rotate synchronously, centre wheel (5) is installed on the axis; Combustion gas is discharged by gas outlet (6) via distribution valve valve seat and distribution valve valve gap (4) after getting into the metering cavity via distribution valve valve gap (4), gas distributing valve valve seat successively again; Epithelium clamping plate (12) in the described measuring room (2) are movably connected on respectively on the end of toggle; Described centre wheel (5) also links to each other with counting assembly (7) through gearing; It is characterized in that: described centre wheel is equipped with the calorific value correcting device on (5); At least comprise crank block (8) in the calorific value correcting device, and centre wheel (5) radially near being provided with the slide rail (51) that is complementary with crank block (8) near its center; The end of described toggle is provided with connecting rod (9), and an end of connecting rod (9) is movably connected on the crank block (8); Described gas meter, flow meter is provided with air intake opening and gas outlet, and air intake opening is connected with the porting of distribution valve valve gap (4), and the gas outlet is connected with gas outlet (6) on the movement.
2. diaphragm gas meter according to claim 1; It is characterized in that: described calorific value correcting device also comprises scroll spring (10); Scroll spring (10) is installed near the slide rail (51) of centre wheel (5); The free end of scroll spring (10) and crank block (8) interfix, and stiff end is fixed on the centre wheel (5).
3. diaphragm gas meter according to claim 2 is characterized in that: one section straight line portion all is set on the free end of described scroll spring (10) and the stiff end, and keeps spacing between scroll spring (10) and the crank block (8).
4. diaphragm gas meter according to claim 2 is characterized in that: described scroll spring (10) integral body is the spiral of Archimedes shape, and its xsect is a rectangle.
5. diaphragm gas meter according to claim 2 is characterized in that: described scroll spring (10) is to adopt the Precise Alloy of being processed into by two kinds of thermal expansivity different metallic.
6. diaphragm gas meter according to claim 1; It is characterized in that: described toggle is corresponding with the quantity of measuring room (2) in the bellows (1), by affecting arm (11), vertical shaft (14), rocking bar (13), connecting rod (9) to constitute, affects an end of arm (14) to be installed in the chute of epithelium clamping plate (12) respectively; The other end is connected with vertical shaft (14) lower end; Rocking bar (13) is fixed on the upper end of vertical shaft (11), and an end of connecting rod (9) matches with rocking bar (13), and the other end is installed on the crank block (8).
7. according to claim 1 or 6 described diaphragm gas meters; It is characterized in that: the measuring room (2) in the said bellows (1) is two; Toggle also is two covers, and an end of the connecting rod (9) in the two cover crank linkage assemblys is all installed on the crank block (8) that is hinged on the centre wheel (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120201810 CN202119482U (en) | 2011-06-16 | 2011-06-16 | Calorific value correcting diaphragm gas meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120201810 CN202119482U (en) | 2011-06-16 | 2011-06-16 | Calorific value correcting diaphragm gas meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202119482U true CN202119482U (en) | 2012-01-18 |
Family
ID=45460539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120201810 Expired - Lifetime CN202119482U (en) | 2011-06-16 | 2011-06-16 | Calorific value correcting diaphragm gas meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202119482U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791969A (en) * | 2014-02-25 | 2014-05-14 | 成都秦川科技发展有限公司 | Gas meter internally provided with mechanical gas temperature conversion device |
| CN105784048A (en) * | 2016-05-17 | 2016-07-20 | 成都秦川科技发展有限公司 | Diaphragm type gas meter |
| CN114193771A (en) * | 2020-09-18 | 2022-03-18 | 成都秦川物联网科技股份有限公司 | Thing networking intelligent gas table involucra hot melt connecting device |
-
2011
- 2011-06-16 CN CN 201120201810 patent/CN202119482U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791969A (en) * | 2014-02-25 | 2014-05-14 | 成都秦川科技发展有限公司 | Gas meter internally provided with mechanical gas temperature conversion device |
| CN103791969B (en) * | 2014-02-25 | 2016-09-21 | 成都秦川科技发展有限公司 | A kind of gas meter, flow meter of Built-in mechanical gas temperature conversion equipment |
| CN105784048A (en) * | 2016-05-17 | 2016-07-20 | 成都秦川科技发展有限公司 | Diaphragm type gas meter |
| WO2017197839A1 (en) * | 2016-05-17 | 2017-11-23 | 成都秦川科技发展有限公司 | Wide-range diaphragm gas meter |
| CN114193771A (en) * | 2020-09-18 | 2022-03-18 | 成都秦川物联网科技股份有限公司 | Thing networking intelligent gas table involucra hot melt connecting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103791969B (en) | A kind of gas meter, flow meter of Built-in mechanical gas temperature conversion equipment | |
| CN202119482U (en) | Calorific value correcting diaphragm gas meter | |
| CN102261938B (en) | Heat value correction type diaphragm gas meter | |
| JP6652660B2 (en) | Wide-range membrane gas meter | |
| CN104131885A (en) | Valve drive apparatus and supercharger having the same | |
| CN202329714U (en) | Temperature compensation membrane type gas meter | |
| WO2023151565A1 (en) | Modular flow measurement method and apparatus, and application | |
| CN203732122U (en) | Built-in mechanical gas meter of gas temperature conversion device | |
| CN102966472B (en) | Continuous variable-length intake manifold and engine control system | |
| CN207568784U (en) | Single head formula intelligent metering pumps | |
| CN101907479B (en) | Fine adjustment mechanism for crank of diaphragm gas meter | |
| CN203203644U (en) | Novel temperature-compensation machine core of gas meter | |
| CN201569459U (en) | Novel film-type gas meter | |
| CN204827681U (en) | Air throttle and have its engine | |
| CN201517478U (en) | Plunger type variable-speed stroke-adjustable metering pump | |
| CN208982682U (en) | A kind of control valve of regulating flow quantity | |
| CN203837781U (en) | Piston-type flow calibrator with built-in lead screw | |
| CN109341789A (en) | A kind of diaphragm gas meter | |
| CN213336284U (en) | Novel adjustable flow piston type meter | |
| CN2447744Y (en) | Small flow gasmeter | |
| CN104775945A (en) | EGR (exhaust gas recirculation) valve integrating device for automobile engine | |
| US2741122A (en) | Gas meters | |
| CN2748876Y (en) | Temperature compensation gas meter | |
| CN204373717U (en) | A kind of error transfer factor mechanism | |
| CN213336283U (en) | Adjustable flow piston type meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 610000 Longquanyi, Sichuan Province Industrial Park licensing Patentee after: Chengdu Qinchuan networking Polytron Technologies Inc Address before: 610000 Longquanyi, Sichuan Province Industrial Park licensing Patentee before: Chengdu Taichuan Technology Development Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120118 |