CN1167234A - Burner of liquid fuel - Google Patents
Burner of liquid fuel Download PDFInfo
- Publication number
- CN1167234A CN1167234A CN96117931A CN96117931A CN1167234A CN 1167234 A CN1167234 A CN 1167234A CN 96117931 A CN96117931 A CN 96117931A CN 96117931 A CN96117931 A CN 96117931A CN 1167234 A CN1167234 A CN 1167234A
- Authority
- CN
- China
- Prior art keywords
- combustion
- burning
- flame
- liquid fuel
- fuel
- 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.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/008—Flow control devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
- F23D11/106—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting at the burner outlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/44—Preheating devices; Vaporising devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2202/00—Liquid fuel burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C5/00—Stoves or ranges for liquid fuels
- F24C5/10—Stoves or ranges for liquid fuels with atomising burners
Abstract
The invention provides a liquid fuel combustion device which obviates a combustor of a complicated construction and minimizes an odor produced right after extinc tion of flame. At the time of extinguishing fire, the consumption rate of the liquid fuel is made as equal as the consumption rate of the combustion air so that the blowing off of the flame hardly occurs and a combustion residue can be reduced. Furthermore, after the flame is extinguished, a combustion blower is operated again to discharge the combustion residue. Still furthermore, at the time of extinguishing the flame, a convection air supplied from a convection fan is reduced to zero so that after an odor is diffused in a combustion sleeve, the convection fan is operated again to discharge the air through a hot air blow-off opening.
Description
The liquid fuel and the combustion air that the present invention relates to behind a kind of will the gasification are pre-mixed the burning apparatus for combustion of liquid fuel of burning again.
Figure 11 shows that the spy opens the sectional drawing of the burning apparatus for combustion of liquid fuel that proposes on the flat 5-149514 communique, wherein, 1 is gasifier, is the liquid fuel gasification part; The 2nd, electric heater, this electric heater is embedded in the sidewall of gasifier 1, is used for heating and gasifying device 1; The 3rd, be fixed on the throttling element on gasifier 1 top; 4 are provided in a side of the burner head above the throttling element; 5 are provided in a side of a plurality of fire holes of burner head 4 sidewalls.In addition, the 6th, around fire hole 5 peripheries and be close to the wire netting of outer wall installing, 7 are provided in a side of the top cover on burner head 4 tops, and the 8th, burner head 4 and top cover 7 are fixed on special bolt on the throttling element 3.
The 9th, mixed plate, this mixed plate are arranged in the burner head 4, and a plurality of holes are arranged on the bottom surface, and the liquid fuel after the gasification is through after these mixed plate 9 rectifications, again from a plurality of fire hole 5 ejections.The 10th, flame stabilization ring, this flame stabilization ring are installed in the top of gasifier 1 around burner head 4.
The 11st, nozzle, this nozzle are located at the sidewall upper shed of gasifier 1 in gasifier 1, this nozzle 11 by air hose (not drawing among the figure) and burning with blower fan (not drawing among the figure) be communicated with, nozzle 11 is made of inlet portion 11a, contraction flow region 11b and the 11c of throat.The 12nd, fuel feed pipe, this pipe and nozzle 11 are on same axis, and its front end supply port 12a that acts as a fuel stretches out from the 11c of throat, and the liquid fuel of fuel tank (not drawing among the figure) is infeeded in the gasifier 1 by petrolift (not drawing among the figure).
Be illustrated with regard to operation principle below.At first, connect electric heater gasifier 1 is preheating to the required temperature of liquid fuel gasification (200～300 ℃).
After preheating finished, the combustion air that is provided with blower fan by burning sprayed in the gasifier 1 from nozzle 11 after by air hose.In addition, certain amount of fluid fuel is infeeded in the gasifier 1 from fuel feed pipe.Certain amount of fluid fuel is to instigate primary air ratio (equaling the ratio of actual confession air capacity and theoretical air requirement) to reach the value when being suitable for lighting a fire most.
The burned aerosol airization of supplying with of using of liquid fuel, and on the internal face of gasifier 1, gasify.Liquid fuel after the gasification further makes CONCENTRATION DISTRIBUTION even with the combustion air premix by throttling element 3 time.Afterwards, the mixed gas flow of vaporising fuel and combustion air cross on mixed plate 9 bottom surfaces the hole and by rectification, under the effect of mixed plate 9 sidewalls, make the velocity flow profile on burner head 4 above-below directions even.
Mist is lighted by igniter (not drawing among the figure) on the fire hole 5 of burner head 4, forms flame 14 and secondary flame 15.After the burning beginning, reclaim heat from flame,, therefore, can close electric heater 2 with heating and gasifying device 1 by flame stabilization ring 10 grades.
Yet this burner is simultaneously fuel shutoff pump and burning with the power supply of blower fan when flame-out.In this case, petrolift has almost just stopped in moment, even burning disappears with blower voltage, because its inertia, its rotation also slowly reduces revolution and stops after the several seconds again.
So the minimizing of fuel is like that very fast shown in solid line among Figure 12, if at T
0The time fuel shutoff pump power supply, owing to reasons such as gasifications, some waste heat amounts are arranged at T
1The time just vanishing.
And on the other hand, the minimizing speed of combustion air is slower than fuel, and is shown in dotted line such, to T
2In time, just stop to supply with.On this burner, the T when closing fire
0To T during this period of time in, the ratio of combustion air and fuel, promptly primary air ratio is learned flammable scope, so burning can continuation, still, after T, air begins surplus, flame is blown out (blow off).So because both minimizing speed is unbalanced, the primary air ratio when flame-out increased in moment,, make part uncombusted residual fuel (shown in Figure 12 bend part) drain into indoor with flame blow-off.At this moment, the part of uncombusted residual fuel contacts and oxidation with the high-temperature portion of burner, generates materials such as acetaldehyde, produces pungent odour.
In order to address this problem, the past, the method that adopts fair strictly according to the facts 3-45010 communique to be proposed, the primary air ratio when promptly keeping flame-out is certain, and quantity combusted drops to below the common quantity combusted as far as possible.Figure 13 shows that the gasification pipe burner of the embodiment of above-mentioned utility model communique.Among Figure 13, the fuel in gasifier 2 after the gasification is sprayed onto the burner 32 from nozzle 31, flows to external firing from fire hole 6.At this moment, combustion air is by vaporising fuel during from nozzle 31 ejection, utilizes the injection effect from sucking on every side.
In this version, the variation of quantity combusted is reached by the change of the fuel oil mass that pump 21 is carried.On the other hand, because combustion air sucks by ejector action, so, spray the ratio of fuel in can corresponding nozzle 31 and increase and decrease.Therefore, when flame-out, in case quantity combusted reduces, primary air ratio almost remains unchanged, and flame diminishes, and presses close to the surface of burner 32 at last.When flame was pressed close to burner 32, the heat of passing to burner 32 from flame increased, and flame is cooled and extinguishes.And when flame disappeared or is about to disappear, magnetic valve 33 cut out.
On the burner of this spline structure, can not distinguish independent change as fuel and combustion air, so, when magnetic valve 33 cuts out, the supply of fuel and combustion air two aspects has all stopped, the mist that remains in when flame-out in the burner 32 is not discharged, and becomes unburnt residual gas.Therefore, in this case, though for the residual gas of after-flame has reduced than residual air capacity shown in Figure 12, this part remaining gaseous mixture is slowly to spread to the outside from burner 32, so stink president time remaining is continuous.
As improving the another kind of method that stinks when flame-out, like that, be to consider to shunt a part of combustion air shown in public strictly according to the facts clear 61-30035 communique and the real public clear 62-29809 communique at Guan Huoshi, make flame when closing fire, be difficult for being blown out.Specifically, shown in the public clear 62-29809 communique of above-mentioned reality, be on the intake adit of combustion air, valve to be set, Guan Huoshi, it is outside that a part of combustion air is overflowed.In this case, when closing fire the situation of fuel and combustion air as shown in figure 14, from closing fiery initial time T
0Rise, the minimizing situation of combustion air is shown in dotted line like that, and the time that increases to when flame taking place being blown out when primary air ratio is T, so, compares with situation shown in Figure 12, and the quantity combusted when flame taking place being blown out is littler.Therefore, some uncombusted residual fuel have been reduced.
But, at this moment, burning with the method for shutting down of blower fan and petrolift with in the past the same, so combustion air and fuel are reduced to the zero time (Figure 14 is from T
0～T
1And T
0～T
2) with in the past the same, the reduction DeGrain of uncombusted residual fuel shown in the oblique line part all can send pungent odour in the flame-out back long period.
In this method, be the after-flame residual fuel in order to reduce shown in the oblique line part, also can strengthen the outside combustion air ratio of overflowing, still, the minimizing of combustion air can make fuel quantity be in superfluous state, thereby produces yellow flame or coal smoke.And, in this class embodiment, must be if the mechanism that combustion air is overflowed, so it is complicated that the external structure of burner becomes.
Because traditional burning apparatus for combustion of liquid fuel is as above a version, therefore, exist problems such as effectively to reduce the foul smell of discharging when flame-out and burner maximization, expensiveization.
The present invention proposes in order to address the above problem, and purpose is to provide a kind of burning apparatus for combustion of liquid fuel, and the burner structure of this burner is simple, and in bigger quantity combusted scope, flame-out back stink is few, and foul smell is president's time remaining not.
Burning apparatus for combustion of liquid fuel of the present invention, its method be control at least fuel supply system and burning with in the blower fan either party, the minimizing ratio of the minimizing of liquid fuel supply amount and combustion air quantity delivered is approaching when making the pass fire, control circuit is set simultaneously, burning is restarted after flame-out with blower fan.
And the present invention has following feature: Guan Huoshi, utilizes above-mentioned burning is made the combustion air minimizing with the control of blower fan, follow this process, control above-mentioned convection fan, it is stopped fast, make convection current reduce to zero with air, and through restarting after the time of setting.
Fig. 1 is the burning apparatus for combustion of liquid fuel structure chart of the embodiment of the invention 1.
Fig. 2 is the key diagram that combustion air reduces situation in the embodiment of the invention 1.
Fig. 3 is the power supply wave shape figure when burning is with the blower fan additional brake in the embodiment of the invention 1.
Fig. 4 is that combustion air increases the key diagram of situation when infeeding combustion air again after stopping working in the embodiment of the invention 1.
Fig. 5 is the key diagram that the embodiment of the invention 1 and conventional apparatus foul smell are discharged situation.
Fig. 6 is the embodiment of the invention 2, and when postponing to infeed the combustion air after flame-out, combustion air increases the key diagram of situation.
Fig. 7 is the embodiment of the invention 3, when reducing flame-out after-combustion with the gathering way of air, and the key diagram of combustion air increase situation.
Fig. 8 is the sectional drawing of the oil warm-air drier of the embodiment of the invention 4.
Fig. 9 is the key diagram of back convection current with the air increase or the situation of minimizing that stop working in the embodiment of the invention 4.
Figure 10 is the key diagram that the embodiment of the invention 4 and the foul smell of conventional apparatus are discharged situation.
Figure 11 is the sectional drawing of the burner part of traditional liquid fuel burner.
Figure 12 is in the traditional liquid fuel burner, and fuel after stopping working and combustion air reduce the key diagram of situation.
Figure 13 is the sectional drawing of another conventional burners.
Figure 14 is the key diagram that burning and combustion air reduce situation in the conventional burners.
Below, with reference to diagram embodiments of the invention 1 are illustrated.Fig. 1 is a burning apparatus for combustion of liquid fuel pie graph in the embodiments of the invention 1.Wherein the symbol with conventional case something in common shown in Figure 11 or same section is identical, just no longer is illustrated at this.
Among Fig. 1, the 21st, the petrolift (fuel supply system) that also uses in the conventional case, in order to liquid fuel to be provided, an end of this petrolift 21 places fuel reservoir 22, and the other end is connected with cartridge 12.
The 23rd, air hose (combustion air feed path) is connected with nozzle 11, supplies with combustion air; The 24th, the burning blower fan.The 25th, control circuit is used to control petrolift 21 and burning blower fan 24.
Below, describe with regard to operation principle.The action and the conventional case of burning beginning (igniting) are roughly the same.(200～300 ℃ the time, burning is rotated with blower fan, provides burning necessary air capacity to gasifier 1 when gasifier 1 is heated to the temperature that sets.After igniter (not drawing among the figure) action, beginning starting fluid pump 21 provides liquid fuel.
The liquid fuel that sprays in the gasifier 1 gasifies on the gasification wall, is mixed into premixed gas with combustion air.This premixed gas is by throttling element and mixed plate 9, and lighted at fire hole 5 places of burner head 4, forms flame 14 and secondary flame 15.Gas after the burning mixes with air from convection fan (not drawing among the figure), is used to indoor heating etc.
When closing fire, when user's switch (not drawing among the figure) of cutting off the electricity supply carries out Guan Huoshi, control circuit 25 stops immediately to petrolift 21 power supplies.At this moment, the method for shutting down of petrolift 21 is with in the past the same, and fuel is such through T shown in solid line among Fig. 2
0～T
1Time after be reduced to zero.The speed of its minimizing is identical with the situation of conventional case shown in Figure 12.
On the other hand, the situation of combustion air is if burning is with the driving power of blower fan 24 alternating current not, then utilize the control circuit switch driving circuit, AC power is carried out as shown in Figure 3 halfwave rectifier, thereby add a braking with blower fan 24 for burning, the minimizing air mass flow.At this moment, the flow of combustion air is such as shown in phantom in Figure 2, can reduce to zero than the situation of conventional case shown in Figure 12 in the shorter time.
Therefore, the roughly the same (T of minimizing speed of combustion air and fuel
1=T
2), quantity combusted reduces under the constant situation of primary air ratio gradually.
And along with quantity combusted reduces, a flame is pressed close to burner head 4, and therefore flame 14 burned device heads 4 coolings are when cooling caloric receptivity during greater than the combustion heating amount when time T (among Fig. 2), fray-out of flame.Be Fig. 2 bend shown in part for the after-flame residual fuel this moment, compares with conventional case shown in Figure 12, reduced a lot.
And, when flame is blown out (T point), start the burning blower fan once more, supply with combustion air.The flow of combustion air as shown in phantom in Figure 4 at this moment.Discharge with air and the uncombusted amount in the burner head 4 of remaining in is burned, very effective to the problem that reduces pungent odour, improves the foul smell time remaining.
The representative foul smell measurement result of above-mentioned situation as shown in Figure 5.Among Fig. 5, with the index of hydrocarbon (Hydrocarbon=HC) concentration as the foul smell amount.When adopting traditional pass ignition method, as shown in Figure 12, there is a large amount of uncombusted residual fuel, so hydrocarbon is such as shown in phantom in Figure 5, after flame-out, reach very high concentration, and in contrast to this, when adopting the pass ignition method of present embodiment 1, as shown in Figure 2, the uncombusted residual fuel is considerably less.So the foul smell that discharge flame-out back seldom like that, has only 1/5 of conventional case shown in solid line A part among Fig. 5.
But, this moment, the uncombusted residual fuel also was not reduced to zero, but, because flame-out after-combustion starts once more with blower fan 24, combustion air infeeds in the gasifier 1, and remaining fuel in the gasifier 1 is directly discharged, so, restarting back foul smell of discharging by burning shown in solid line B part among Fig. 5 with blower fan 24, is few, has only 1/3 of conventional case.Embodiment 2
In Fig. 4, though the time that burning is restarted with blower fan 24 just in time is the time (T point) that flame is blown out, as shown in Figure 6, even late several seconds (T of the time (T point) that the time ratio flame that burning is restarted with blower fan 24 is blown out
2, T
3Point), also can obtain the effect identical with the foregoing description 1, and, solid line B part is moved on time shaft backward, thereby partly draw back at interval with A, can more effectively dilute foul smell.Embodiment 3
In addition, as shown in Figure 7, the toggle speed in the time of also can restarting with blower fan 24 by the control burning changes gathering way of combustion air, and the upstroke slope of solid line B part is less among Fig. 5 at this moment, can obtain the effect same with the foregoing description.Embodiment 4
Below introduce embodiments of the invention 4.The basic comprising of embodiment 4 is identical with the foregoing description 1, and is only different in control circuit 25 parts, Guan Huoshi, and the convection fan 43 shown in the control chart 8 makes the quantity delivered of convection current air such shown in chain-dotted line among Fig. 9.Specifically, Guan Huoshi, along with the minimizing of fuel feed, the quantity delivered of combustion air also reduces, and simultaneously, adds a braking for convection fan 43, makes it at flame-out T constantly, and the convection current air capacity of supply is zero, and at T
4Shi Zaici starts convection fan 43.
After convection current has been made such change with the quantity delivered of air, in the foul smell that produces when the pass among Fig. 5 shown in the solid line A is fiery, the foul smell of A part spreads to shell 41 upper spaces in combustion barrel shown in Fig. 8 42, and discharges from greenhouse outlet 44, thereby is reduced to the A shown in solid line among Figure 10
1Part.Afterwards, the discharge peak value (shown in solid line B part among Fig. 5) that produces with restarting of blower fan 24 owing to burning is restarted the convection current air that produced from greenhouse outlet 44 discharges by convection fan 43, become B among Figure 10
1Part.Like this, the foul smell that discharge flame-out back, its A
1Part has only 1/10 of conventional case, and B
1Part has only 1/5 of conventional case.
The effect of invention
As mentioned above, according to the present invention, at Guan Huoshi, the minimizing of respective liquid fuel feed and Reduce the quantity delivered of combustion air. And, after fray-out of flame, again start the burning blower fan, Air-supplied in the gasifier, so, no matter quantity combusted is much when closing fire, closes in the fiery process and mix Gas concentration remains in the flammable range, thus showing of can not taking place that the sort of flame in the past blown out Resemble, flame just extinguishes when quantity combusted is minimum, has reduced the uncombusted residual fuel. And, Also effectively discharged with regard to this few uncombusted residual fuel, so, can not make the burner knot In the complicated situation of structure, obtain to reduce the effect of the pungent odour that produces after flame-out with low cost Really.
In addition, according to the present invention, at Guan Huoshi, the minimizing of respective liquid fuel feed and reducing The quantity delivered of combustion air, and, when fray-out of flame, stop the air feed of convection fan, work as row The foul smell that goes out is restarted convection fan wait local diffusion in combustion barrel after, therefore, and can be in burning In the situation of uncomplicatedization of device structure, obtain to reduce the flame-out rear pungent odour that produces with low cost Effect.
Claims (2)
1, a kind of burning apparatus for combustion of liquid fuel.This burning apparatus for combustion of liquid fuel is by constituting with the lower part: fuel feed system comprises pump that liquid fuel is provided etc.; Blower fan is used in burning, and combustion air is provided; Control circuit is controlled the burning of unifying of above-mentioned fuel supply system and is used blower fan; Gasifier is with the liquid fuel gasification that infeeds; Burner head, the premixed gas of combustion gasification liquid fuel and combustion air; Combustion barrel covers the flame that forms on burner head; Convection fan, with the burning after gas to indoor diffusion,
It is characterized in that: above-mentioned control circuit is controlled above-mentioned burning with blower fan and above-mentioned fuel feed system when closing fire, flame is extinguished under the close situation of the minimizing ratio of combustion air and liquid fuel, and, after stopping working, start the burning blower fan once more.
2, burning apparatus for combustion of liquid fuel as claimed in claim 1.It is characterized in that: Guan Huoshi, control above-mentioned burning blower fan, combustion air is reduced, simultaneously, control above-mentioned convection fan, it is stopped fast, reduce the convection current air, and, behind setting-up time, start convection fan once more.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP138721/96 | 1996-05-31 | ||
| JP8138721A JPH09318044A (en) | 1996-05-31 | 1996-05-31 | Liquid fuel combustion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1167234A true CN1167234A (en) | 1997-12-10 |
Family
ID=15228598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96117931A Pending CN1167234A (en) | 1996-05-31 | 1996-12-23 | Burner of liquid fuel |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH09318044A (en) |
| KR (1) | KR100229759B1 (en) |
| CN (1) | CN1167234A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202346A (en) * | 2017-06-20 | 2017-09-26 | 龙志威 | Liquid fuel vaporizing burner |
| CN107388245A (en) * | 2017-08-04 | 2017-11-24 | 龙志威 | Alcohol-based fuel gasifying furnace head |
| CN110612419A (en) * | 2017-05-16 | 2019-12-24 | 西门子公司 | Improved emission-turndown binary fuel staging scheme for lean premixed gas turbine combustion |
| CN110812853A (en) * | 2019-09-26 | 2020-02-21 | 诺心达(厦门)科技有限公司 | Object emitter device and use method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6420595B2 (en) * | 2014-08-25 | 2018-11-07 | 株式会社コロナ | Combustion device |
-
1996
- 1996-05-31 JP JP8138721A patent/JPH09318044A/en active Pending
- 1996-11-05 KR KR1019960051968A patent/KR100229759B1/en not_active IP Right Cessation
- 1996-12-23 CN CN96117931A patent/CN1167234A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110612419A (en) * | 2017-05-16 | 2019-12-24 | 西门子公司 | Improved emission-turndown binary fuel staging scheme for lean premixed gas turbine combustion |
| US11125437B2 (en) | 2017-05-16 | 2021-09-21 | Siemens Energy Global GmbH & Co. KG | Binary fuel staging scheme for improved turndown emissions in lean premixed gas turbine combustion |
| CN110612419B (en) * | 2017-05-16 | 2022-01-25 | 西门子能源全球两合公司 | Improved emission-turndown binary fuel staging scheme for lean premixed gas turbine combustion |
| CN107202346A (en) * | 2017-06-20 | 2017-09-26 | 龙志威 | Liquid fuel vaporizing burner |
| CN107388245A (en) * | 2017-08-04 | 2017-11-24 | 龙志威 | Alcohol-based fuel gasifying furnace head |
| CN110812853A (en) * | 2019-09-26 | 2020-02-21 | 诺心达(厦门)科技有限公司 | Object emitter device and use method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09318044A (en) | 1997-12-12 |
| KR970075643A (en) | 1997-12-10 |
| KR100229759B1 (en) | 1999-11-15 |
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| SE01 | Entry into force of request for substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |