CN2697559Y - Ceramic curcible pre-treatment furnace for nifrared carbon sulphur analysis - Google Patents
Ceramic curcible pre-treatment furnace for nifrared carbon sulphur analysis Download PDFInfo
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- CN2697559Y CN2697559Y CN 200420017314 CN200420017314U CN2697559Y CN 2697559 Y CN2697559 Y CN 2697559Y CN 200420017314 CN200420017314 CN 200420017314 CN 200420017314 U CN200420017314 U CN 200420017314U CN 2697559 Y CN2697559 Y CN 2697559Y
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Abstract
The utility model relates to a ceramic crucible pre-treatment furnace for infrared carbon sulfur analysis, in particular to a ceramic crucible pre-treatment furnace which is used for eliminating carbon sulfur elements remained by the ceramic crucible and is used for guaranteeing the accuracy rate of infrared carbon sulfur analytical samples. The utility model belongs to the field of a high-temperature electric resistance furnace. The top part of the pre-treatment furnace is a furnace part, and the bottom part of the pre-treatment furnace is an electric control part. The furnace part consists of a cupola shell and a furnace body. The inner cavity of the furnace body is a furnace cavity which is a rectangle and opened upwards. The furnace body is provided with three covers for sealing so that the pre-treatment furnace is provided with a good temperature retention. The heater is made of molybdenum silicide rod so that calcination temperature is stable. Calorific efficiency is high and life time is long. The pre-treatment ways of loading the ceramic crucible by two pate dure tubes, hand propelling, automatically burning, current burning, current using and continuously heating to cool have the advantages of large loadage, convenient claim and continuous claim. The pre-treatment furnace has the advantages of long service life, less equipment failure, convenient maintenance, etc. and is suitable to all checkout rooms which need to use carbon sulfur analytic instruments.
Description
Technical field
The utility model relates to a kind of infrared analysis of carbon and sulfur porcelain crucible preliminary treatment stove, and specifically a kind of carbon-sulfure elements that is used to eliminate porcelain crucible remnants itself to guarantee the porcelain crucible preliminary treatment stove of infrared analysis of carbon and sulfur sample accuracy rate, belongs to the high temperature resistance furnace field.
Background technology
At present, need to analyze in each laboratory of carbon-sulfure elements at home, the porcelain crucible preliminary treatment stove of eliminating the residual carbon element sulphur of porcelain crucible own typically uses high temperature box type resistance furnace, resistance wire is a heater but the high temperature box furnace weak point of this class preliminary treatment porcelain crucible is employing, calorific capacity is lower, and resistance wire is shorter service life; After the porcelain crucible is done calcination processing in stove simultaneously, although carbon and the element sulphur of the original remnants of porcelain crucible itself are burnt, but pretreated porcelain crucible is in the process of cooling off, shifting and deposit, cause the different pollution once more of degree easily, the carbon-sulfure elements content of porcelain crucible is increased once more, and the result is inaccurate when making porcelain crucible with a collection of calcination carry out the analysis of sample; Pending in addition porcelain crucible need be put in the high temperature box furnace one by one, need to be cooled to room temperature behind a few hours heat temperature raising, takes out one by one and puts into drier, takes out weighing or the like one by one when using, and each procedure is loaded down with trivial details, and labor productivity is low.The model that has Japanese HORIBA GROUP Horiba Seisakusho K.k. to produce in calendar year 2001 abroad is FK-10 " CRUCIBLE CRUCIBLE PER-BURNING ", the preliminary treatment stove that is used for calcination porcelain crucible, its weak point is: 1. also adopting resistance wire is heater, the highest furnace temperature that its heating can reach is lower, make the carbon-sulfure elements calcination of porcelain crucible itself incomplete, accurately analyze super low carbon and sulphur and have difficulties; Resistance wire blows easily, fault rate is higher, and service life is also shorter; 2. the high-temperature area that is used for calcination porcelain crucible is too short, but the quantity of calcination porcelain crucible very little, can't satisfy the production scene demand of using the porcelain crucible continuously in enormous quantities; 3. it is higher to introduce expense, and difficulty is promoted at home.
Summary of the invention
The purpose of this utility model be to provide a kind of can overcome the not enough and novel structure of above-mentioned preliminary treatment stove, cheap, easy to use fast, pretreating effect significantly, and the infrared analysis of carbon and sulfur that can satisfy the laboratory needs with porcelain crucible preliminary treatment stove.
The purpose of this utility model reaches by following measures: a kind of infrared analysis of carbon and sulfur porcelain crucible preliminary treatment stove is provided, top is the stove part, the bottom is an electric control system, the stove part is made up of furnace shell (1), body of heater (3), high temperature porcelain tube (12) and double platinum rhodium thermocouple (16), it is characterized in that: stove part furnace shell is made by aluminium sheet and angle steel, there is one to constitute in the side plate of furnace shell by upper and lower two-section side plate, be provided with body of heater in the furnace shell, maintain the distance of 70～80mm between furnace shell and body of heater; The inner chamber of body of heater is the burner hearth of a rectangle, the burner hearth upward opening, step is arranged on the wall, step is provided with the opening of two lid sealing burner hearths, the one, burner hearth lower cover (7) lies on the step of inboard wall of burner hearth for the spill cuboid, the 2nd, burner hearth gland (5) is pressed in the recess of burner hearth lower cover, also has a burner hearth loam cake (4) to be enclosed on the body of heater upper surface; Tie (13) is fixed on body of heater and burner hearth loam cake on the binding post (11) of both sides together; Si-Mo rod (8) is the U-shaped body with two vertical legs, all there are a wire barrel and red copper flexible cord (9) to join from the double-end two leg ends of U-shaped body, U-shaped body arc end is the hot junction, circular arc upper end and two vertical legs are cold junction, the hot junction is stretched in the burner hearth, the cold junction of circular arc upper end is in the slotted eye of the fluting (6) of burner hearth gland (5) and burner hearth lower cover (7), and the other end of red copper flexible cord is connected on the binding post (11) by wiring point (10); Have two pipe high temperature porcelain tubes (12) to run through furnace shell and body of heater front and back walls, the two ends of high temperature porcelain tube are the import and export end of porcelain crucible, and the port of export of porcelain crucible (2) is at the furnace shell antetheca, and the entrance point of porcelain crucible (14) is at the furnace shell rear wall; Double platinum rhodium thermocouple (16) is clipped between two high temperature porcelain tubes, is fixed on the rear wall of furnace shell, also is provided with two air exhausters (17) in the rear wall of furnace shell; Two crucible framves (15) are located at respectively under the import and export end of porcelain crucible, are fixed on the outer wall of furnace shell.
Preliminary treatment stove of the present utility model, its top are the stove part, and the bottom is an electric control system, and is relatively independent separately.It is more convenient that this design makes manufacturing, uses and keep in repair the preliminary treatment stove, and manufactory can be assembled into complete preliminary treatment stove respectively based on the workshop manufacturing part separately of electric and anti-material.The preliminary treatment stove uses and can only need open the part that will keep in repair according to the service failure situation when keeping in repair, and reduces maintenance cost and alleviates service worker labour intensity.
Preliminary treatment stove furnace shell of the present utility model is made by aluminium sheet and angle steel, adopts aluminium sheet to make panel and makes the furnace shell surface more smooth attractive in appearance, adopts angle steel to do the limit and has served as a contrast reinforcement effect.Have side plate to be made of upper and lower two blocks of side plates in the side plate of furnace shell, operation easily when design made maintenance like this.Maintain distance between furnace shell and body of heater, can make that air flows in the furnace shell, owing in the furnace shell two air exhausters are arranged, extract a small amount of dispersed heat out furnace shell by air exhauster during stove work simultaneously, keep furnace shell to be in lower state of temperature all the time.
Preliminary treatment stove of the present utility model uses Si-Mo rod as heater, Si-Mo rod (8) is the U-shaped body with two vertical legs, the hot junction of U-shaped body portion and cold junction are made with the silicon Mo of two kinds of materials, the arc end of U-shaped body is the hot junction, circular arc upper end and vertical two legs thereof are cold junction, two leg ends all have a wire barrel and red copper flexible cord (9) to join, and the hot junction is stretched in the burner hearth, and the cold junction on U-shaped body top is in the slotted eye of the gland of burner hearth gland (5) fluting (6) and burner hearth lower cover (7).The other end of red copper flexible cord is connected on the binding post (11) by wiring point (10); 6 Si-Mo rods that use are arranged in the right and left of burner hearth lower cover respectively.The circuit of the utility model control system is connected by the control connection point of lead with the stove part.
Preliminary treatment stove of the present utility model has adopted high temperature porcelain tube one end that is exposed at the furnace shell rear wall for loading the entrance point (14) of preliminary treatment porcelain crucible, and high temperature porcelain tube one end that is exposed at the furnace shell antetheca is for asking for the port of export (2) of porcelain crucible after handling.The empty stove of elder generation is warming up to 1150 ℃ when using stove for the first time, in every pipe high temperature porcelain tube, adorn 13 porcelain crucibles earlier again, promptly installed to the high temperature section of high temperature porcelain tube, treat that the porcelain crucible is after the high temperature section calcination stops 3 minutes, can continue the porcelain crucible of packing into pending, install to the port of export always and occur till the porcelain crucible, respectively be mounted with 26 porcelain crucibles in the two high temperature porcelain tubes this moment, when entrance point is packed a pending porcelain crucible into, can ask for a porcelain crucible of handling well at the port of export.Two crucible framves (15) are located at respectively under the import and export end of two high temperature porcelain tubes, be fixed on the wall of furnace shell, this design especially makes the porcelain crucible can be easily load, manually advance, ask for from port of export facility after the calcination automatically from entrance point, the porcelain crucible pretreatment mode to cooling of having realized heating continuously.
Preliminary treatment stove of the present utility model, its body of heater (3), burner hearth gland (5) and burner hearth lower cover (7) are used the integral cast of exotic material ceramic fibre respectively, and burner hearth loam cake (4) is cast by insulating material aluminum oxide hollow ball foam; High temperature porcelain tube (12) is made by corundum material; Si-Mo rod (8) is made by silicon, Mo.Three layers of lid sealing body of heater of design can guarantee that the calcination zone and the soak zones of high temperature porcelain tube all can stably remain on normal serviceability temperature scope, make the temperature of furnace shell appearance, also can remain on≤60 ℃ of levels.
The important technological parameters and the index of the utility model preliminary treatment stove are:
1. power supply: single-phase 220V, 20A, 50/60HZ.
2. body of heater furnace temperature: 1150 ℃ of serviceability temperatures, 1300 ℃ of maximum temperatures, casing temperature≤60 ℃.
3. pretreatment mode: manually propellings, two high temperature porcelain tube, every pipe load 26 porcelain crucibles and heat continuously to the pretreatment mode that cools off.
4. preliminary treatment output: 2 porcelain crucibles of per 30 preliminary treatment in second.
The utility model preliminary treatment stove and accessory has following advantage:
1. adopt " Si-Mo rod " low as heater element heating efficiency height, long service life, power consumption.Adopt " resistance wire " or " Elema " to compare as heater element with traditional chamber type electric resistance furnace, not only long service life, equipment fault are few, and operating cost also can reduce significantly.
2. adopt new preliminary treatment porcelain crucible mode, can manually advance, continuous preliminary treatment porcelain crucible, can not only in time satisfy fast and produce needs, also convenient the use guarantees to analyze quality.The utility model can load 26 pending porcelain crucibles continuously in the inside of every pipe high temperature porcelain tube, when entrance point is packed a pending porcelain crucible into, can ask for a porcelain crucible of handling well at the port of export.This heating continuously in the high temperature porcelain tube to the pretreatment mode of cooling compared with the mode of traditional chamber type electric resistance furnace calcination porcelain crucible, not only shortened the calcination time of porcelain crucible, the detected carbon of porcelain crucible, sulphur blank value have also been reduced significantly, the loaded down with trivial details operation in each road of also having omitted loading, cooling simultaneously, having taken out, deposit and take out again the porcelain crucible, thereby alleviated operator's labour intensity widely, greatly improved labour productive forces.
3. adopt novel heat preservation technology to guarantee the calcination regional temperature.The burner hearth opening part of the utility model body of heater has designed the good burner hearth lower cover of sealing, burner hearth gland, also be added with the burner hearth loam cake, make the calcination zone and the soak zones of high temperature porcelain tube all can stably remain within the normal serviceability temperature scope, and can be according to the different requirements of porcelain crucible, the random continuous calcination temperature of setting the high temperature porcelain tube adjustablely.Owing to adopt novel heat preservation technology, the temperature of furnace shell appearance can be remained on≤60 ℃ of levels.
Description of drawings
The utility model preliminary treatment stove further specifies with accompanying drawing:
Fig. 1 looks schematic diagram for the utility model preliminary treatment stove furnace construction part section master, and (1) is that furnace shell, (2) are that Si-Mo rod, (9) for red copper flexible cord, (10) for wiring point, (11) for binding post, (12) for high temperature porcelain tube, (13) be tie, (14) for the entrance point of porcelain crucible, (15) for crucible frame, (17) be air-cooler for the fluting of gland, (7) for burner hearth lower cover, (8) for burner hearth gland, (6) for burner hearth loam cake, (5) for body of heater, (4) for the port of export of porcelain crucible, (3) among the figure.
Fig. 2 is Fig. 1 preliminary treatment stove of the present utility model A-A vertical view, and (16) are the double platinum rhodium thermocouple among the figure.
Fig. 3 and Fig. 4 are respectively burner hearth gland (5) structural front view of the present utility model and vertical view.
Fig. 5 and Fig. 6 are respectively burner hearth lower cover (7) structural front view of the present utility model and vertical view.(18) are the sinking groove among the figure.
Fig. 7 and Fig. 8 are respectively burner hearth loam cake (4) structural front view of the present utility model and vertical view.
Fig. 9 is a Si-Mo rod structural perspective of the present utility model.(8) are Si-Mo rod among the figure, and U-shaped body arc end is the hot junction of Si-Mo rod, and the vertical two legs that draw respectively U-shaped body circular arc upper end and end thereof is the cold junction of Si-Mo rod, and (9) are that red copper flexible cord, (10) are wiring point.
The specific embodiment
Embodiment 1: make the stove part of the utility model preliminary treatment stove, structure as shown in Figure 1.
Make the U-shaped Si-Mo rod (8) with two vertical legs earlier, structure such as Fig. 9, U-shaped body select for use the silicon Mo to make, and Si-Mo rod U-shaped body heat end is of a size of Φ 3mm * 101mm, hot junction circular arc maximum spacing 23mm; Cold junction Φ 6mm * 47mm, spacing 21mm, the long 71mm of cold junction of two legs vertical with the U-shaped body; One wire barrel Φ 8mm * 25mm is arranged behind the cold junction; Red copper flexible cord (9) is made with the red copper flexible cord of 7 gangs of Φ 6mm, and wire barrel and red copper flexible cord with punching press again after the silver solder welding, firmly are connected with the red copper flexible cord to guarantee wire barrel earlier.
Make stove, select the resistant to elevated temperatures casting of crystal alumina fibre body of heater (3), burner hearth gland (5) and burner hearth lower cover (7) for use; Body of heater physical dimension 330mm * 320mm * 330mm, inner chamber are the high-temperature burner hearth of a rectangle, and upward opening has step on the wall, inner chamber 250mm * 236mm * 250mm on the step, step lower inner cavity 183mm * 165mm * 200mm; Two circular holes are respectively arranged on the body of heater front and rear wall, and Circularhole diameter Φ 38mm can insert two pipe high temperature porcelain tubes, also has the hole that can insert the double platinum rhodium thermocouple, Φ 10mm on the burner hearth rear wall; Burner hearth lower cover structure such as Fig. 5, Fig. 6, housing size 249mm * 235mm * 49mm; Burner hearth gland structure such as Fig. 3, Fig. 4, size 182mm * 164mm * 25mm selects for use the casting of alumina hollow ball foam to form; Burner hearth superstructure such as Fig. 7, Fig. 8, size 330mm * 320mm * 50mm; Select commercially available double platinum rhodium thermocouple for use, size Φ 10mm * 300mm; Select two pipe high temperature porcelain tubes again for use, external diameter Φ 37mm, long 600mm, wall thickness 3mm.
Installation step: lower shoe, front and back panels and the side plate of furnace shell (1) are installed, install two air exhausters (17) in the rear wall of furnace shell; Body of heater (3) is packed in the furnace shell, install binding post (11) in the body of heater both sides, the high-temperature burner hearth mouth of body of heater inner chamber is upwards installed double platinum rhodium thermocouple (16), inserts the circular hole of body of heater and furnace shell, is fixed on the rear wall of furnace shell; Manage the front and rear wall that high temperature porcelain tubes (12) run through furnace shell, body of heater, the gap of having repaired high temperature porcelain tube and body of heater with two; Under the port of export (2) of furnace shell front and back walls porcelain crucible and entrance point (14), fix a crucible frame (15) respectively; The burner hearth lower cover (7) of the cuboid of spill is embedded on the step of burner hearth wall, respectively burner hearth is inserted from the slotted eye of burner hearth lower cover in the hot junction of 6 Si-Mo rods (8), burner hearth gland (5) is pressed in the recess of burner hearth lower cover, make the fluting (6) of the cold junction aligning burner hearth gland of U-shaped body Si-Mo rod, the vertical two legs that links to each other with the U-shaped body is submerged in sinking groove (18) lining, the wiring point (10) of the red copper flexible cord (9) of 6 pairs of Si-Mo rod leg ends is received on the binding post, at last burner hearth loam cake (4) is covered on the burner hearth gland, and make it concordant with the body of heater upper surface; Two ties (13) are fixed on burner hearth loam cake and body of heater on the binding post (10) together; Connect the circuit of control system, epipleural, lower side panel and a panel with furnace shell installs at last.The control system electric part contain parts such as main body transformer, controllable silicon, temperature device for digit-displaying, current transformer, fuse, voltmeter and ammeter and with stove partly be connected circuit pack.The circuit of control system and stove part is connected, promptly be made into infrared analysis of carbon and sulfur of the present utility model porcelain crucible preliminary treatment stove.
Embodiment 2: the preliminary treatment stove that the utility model embodiment 1 is made is applied to produce.Should be warming up to 1150 ℃ by first empty stove when using first, and then pending porcelain crucible is packed into one by one from entrance point, every pipe high temperature porcelain tube is adorned 13 porcelain crucibles earlier, has promptly installed to the calcination high temperature section of two high temperature porcelain tubes.Treat that the porcelain crucible after the high temperature section calcination stops 3 minutes, continues the porcelain crucible of packing into pending again, install to the port of export always and occur till the porcelain crucible.This moment two high temperature porcelain tubes inner each be mounted with 26 porcelain crucibles continuously, wherein before high temperature porcelain tube high temperature section be calcination good, can promptly take the i.e. porcelain crucible of usefulness; After high temperature porcelain tube high temperature section, be to wait for pretreated porcelain crucible.After using first, as long as the preliminary treatment stove does not cut off the power supply, can per 30 seconds from the entrance point of the high temperature porcelain tube pending porcelain crucible of packing into, get a porcelain crucible of handling well at the port of export.The porcelain crucible of having handled is measured the standard deviation value of its blank value, and method is: ask for 1 porcelain crucible per 30 seconds, gets 11 altogether; Add 1 gram pure tungsten grain in the porcelain crucible, produce the CS-444 infrared carbon sulfur analyzer with the U.S. and measure, the standard deviation value that records carbon is less than 0.00005%, and the standard deviation value of sulphur can reach the requirement of analyzing super low carbon and sulphur fully less than 0.00002%.
Infrared analysis of carbon and sulfur of the present utility model can use the control laboratory of analysis of carbon and sulfur instrument to use at all with porcelain crucible preliminary treatment stove, is particularly suitable for analyzing the control laboratory use of super low carbon and sulphur demand.
Claims (1)
1, a kind of infrared analysis of carbon and sulfur porcelain crucible preliminary treatment stove, top is the stove part, the bottom is an electric control system, the stove part is made up of furnace shell (1), body of heater (3), high temperature porcelain tube (12) and double platinum rhodium thermocouple (16), it is characterized in that: stove part furnace shell is made by aluminium sheet and angle steel, there is one to constitute in the side plate of furnace shell, is provided with body of heater in the furnace shell, maintain the distance of 70～80mm between furnace shell and body of heater by upper and lower two-section side plate; The inner chamber of body of heater is the burner hearth of a rectangle, the burner hearth upward opening, step is arranged on the wall, step is provided with the opening of two lid sealing burner hearths, the one, burner hearth lower cover (7) lies on the step of inboard wall of burner hearth for the spill cuboid, the 2nd, burner hearth gland (5) is pressed in the recess of burner hearth lower cover, also has a burner hearth loam cake (4) to be enclosed on the body of heater upper surface; Tie (13) is fixed on body of heater and burner hearth loam cake on the binding post (11) of both sides together; Si-Mo rod (8) is the U-shaped body with two vertical legs, all there are a wire barrel and red copper flexible cord (9) to join from the double-end two leg ends of U-shaped body, U-shaped body arc end is the hot junction, circular arc upper end and two vertical legs are cold junction, the hot junction is stretched in the burner hearth, the cold junction of circular arc upper end is in the slotted eye of the fluting (6) of burner hearth gland (5) and burner hearth lower cover (7), and the other end of red copper flexible cord is connected on the binding post (11) by wiring point (10); Have two pipe high temperature porcelain tubes (12) to run through furnace shell and body of heater front and back walls, the two ends of high temperature porcelain tube are the import and export end of porcelain crucible, and the port of export of porcelain crucible (2) is at the furnace shell antetheca, and the entrance point of porcelain crucible (14) is at the furnace shell rear wall; Double platinum rhodium thermocouple (16) is clipped between two high temperature porcelain tubes, is fixed on the rear wall of furnace shell, also is provided with two air exhausters (17) in the rear wall of furnace shell; Two crucible framves (15) are located at respectively under the import and export end of porcelain crucible, are fixed on the outer wall of furnace shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420017314 CN2697559Y (en) | 2004-03-04 | 2004-03-04 | Ceramic curcible pre-treatment furnace for nifrared carbon sulphur analysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420017314 CN2697559Y (en) | 2004-03-04 | 2004-03-04 | Ceramic curcible pre-treatment furnace for nifrared carbon sulphur analysis |
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| Publication Number | Publication Date |
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| CN2697559Y true CN2697559Y (en) | 2005-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420017314 Expired - Fee Related CN2697559Y (en) | 2004-03-04 | 2004-03-04 | Ceramic curcible pre-treatment furnace for nifrared carbon sulphur analysis |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876508A (en) * | 2010-03-31 | 2010-11-03 | 李锦桥 | Experimental electric furnace with cooling function |
| CN102538461A (en) * | 2011-12-31 | 2012-07-04 | 东北电力大学 | Small-sized burning furnace for on-line analysis of weightless method |
| CN104977270A (en) * | 2014-04-10 | 2015-10-14 | 哈尔滨建成集团有限公司 | Analysis method of carbon element in Mo1 pure molybdenum |
| CN105090923A (en) * | 2015-10-06 | 2015-11-25 | 广东力新热能科技有限公司 | Efficient energy-saving aluminum casting body |
-
2004
- 2004-03-04 CN CN 200420017314 patent/CN2697559Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876508A (en) * | 2010-03-31 | 2010-11-03 | 李锦桥 | Experimental electric furnace with cooling function |
| CN101876508B (en) * | 2010-03-31 | 2014-01-08 | 李锦桥 | Experimental electric furnace with cooling function |
| CN102538461A (en) * | 2011-12-31 | 2012-07-04 | 东北电力大学 | Small-sized burning furnace for on-line analysis of weightless method |
| CN104977270A (en) * | 2014-04-10 | 2015-10-14 | 哈尔滨建成集团有限公司 | Analysis method of carbon element in Mo1 pure molybdenum |
| CN105090923A (en) * | 2015-10-06 | 2015-11-25 | 广东力新热能科技有限公司 | Efficient energy-saving aluminum casting body |
| CN105090923B (en) * | 2015-10-06 | 2017-02-01 | 广东力新热能科技有限公司 | Efficient energy-saving aluminum casting body |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050504 Termination date: 20120304 |