JPH07232194A - Water purifying device - Google Patents
Water purifying deviceInfo
- Publication number
- JPH07232194A JPH07232194A JP2243294A JP2243294A JPH07232194A JP H07232194 A JPH07232194 A JP H07232194A JP 2243294 A JP2243294 A JP 2243294A JP 2243294 A JP2243294 A JP 2243294A JP H07232194 A JPH07232194 A JP H07232194A
- Authority
- JP
- Japan
- Prior art keywords
- water
- lower layer
- air
- pump
- air intake
- 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.)
- Withdrawn
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 238000000746 purification Methods 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 8
- 239000003643 water by type Substances 0.000 abstract 3
- 239000010410 layer Substances 0.000 description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 238000013517 stratification Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、閉鎖性水域等の水質改
善を目的とする水質浄化装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification device for improving water quality in closed water areas and the like.
【０００２】[0002]
【従来の技術】従来の水質浄化装置を図２に示す。閉鎖
性の強い水域や海域では夏期の高温期に安定した密度成
層１が発生し、水域の下層の酸素は消費される一方で貧
酸素又は無酸素状態となり水域の汚染が進行していく。2. Description of the Related Art A conventional water purification apparatus is shown in FIG. In a highly closed water area or sea area, a stable density stratification 1 is generated in the high temperature period of summer, oxygen in the lower layer of the water area is consumed, while it becomes anoxic or anoxic and pollution of the water area progresses.
【０００３】このような状況下にある水域の下層に、従
来図２に示すような水質浄化装置を設置して水域の下層
の流動促進を行ない、それに伴う水質の改善を行なって
きた。即ち、水質浄化装置の水流発生部２は、水域の下
層にほぼ水平に配置され両端が開放されている整流筒５
内に設けられたエダクター構造になっており、駆動水ポ
ンプ３により取り込んだ駆動水を水流発生部２から吹き
出すことにより、周囲水４を連行して水域の下層の流れ
を発生させ、整流筒５の出口より排出する。このように
水流発生部２をエダクター構造にすることにより、水質
浄化装置の整流筒５の出口の水量は駆動水量の十数倍に
なり、効率良く下層流動を動かすことができる。また、
本装置の駆動水ポンプ３の取水口６は水域の表面近傍の
表層に設けられていて、比較的溶存酸素（ＤＯ）の多い
表層水を少しでも水域の下層に送り込むようにしてい
る。なお、図２中矢印は水の流れる方向を示す。Conventionally, a water purification apparatus as shown in FIG. 2 has been installed in the lower layer of the water area under such a condition to promote the flow of the lower layer of the water area and to improve the water quality accordingly. That is, the water flow generation part 2 of the water purification device is a straightening tube 5 which is arranged substantially horizontally in the lower layer of the water area and whose both ends are open.
It has an eductor structure provided inside, and blows out the driving water taken in by the driving water pump 3 from the water flow generating section 2, thereby entraining the ambient water 4 to generate a flow in the lower layer of the water area, and the straightening cylinder 5 Discharge from the exit of. By thus forming the water flow generation unit 2 with the eductor structure, the amount of water at the outlet of the flow straightening cylinder 5 of the water purification device becomes ten times as much as the amount of driving water, and the lower layer flow can be efficiently moved. Also,
The water intake 6 of the drive water pump 3 of the present device is provided in the surface layer near the surface of the water area so that even surface water containing a relatively large amount of dissolved oxygen (DO) is sent to the lower layer of the water area. The arrow in FIG. 2 indicates the direction of water flow.
【０００４】[0004]
【発明が解決しようとする課題】前記の従来の水質浄化
装置では、下層の流動促進は可能であるものの、駆動水
ポンプ３で取り込んで下層の流れを発生させる表層水の
溶存酸素には限度があり十分な酸素を下層に送ることが
できず、効果が半減するという問題点があった。In the above-mentioned conventional water purification apparatus, the flow of the lower layer can be promoted, but the dissolved oxygen in the surface water taken in by the driving water pump 3 to generate the flow of the lower layer is limited. There was a problem that sufficient oxygen could not be sent to the lower layer and the effect was halved.
【０００５】本発明は、前記問題点を解決することがで
きる水質浄化装置を提供しようとするものである。The present invention is intended to provide a water purification apparatus which can solve the above problems.
【０００６】[0006]
【課題を解決するための手段】本発明の水質浄化装置は
次の手段を講じた。 （１） 水域の表面近傍の水を駆動水ポンプに取り込
み、これら水域の下層に送り込んで水域の水質を浄化す
る水質浄化装置において、前記駆動水ポンプの吸い込み
側に空気取り込み口を設けた。 （２） 前記（１）の水質浄化装置において、前記空気
取り込み口に空気取り込みバルブを設け、同バルブの開
度を駆動水ポンプの出口側に設けた圧力センサの検出値
で決定するようにした。 （３） 前記（２）の水質浄化装置において、前記圧力
センサの検出値を駆動水ポンプがトリップしない値に設
定した。 （４） 前記（１）の水質浄化装置において、前記空気
取り込み口の直前に流量調整弁を設置した。Means for Solving the Problems The water purification apparatus of the present invention has taken the following means. (1) In a water purification apparatus that takes in water near the surface of a water area into a drive water pump and sends it to the lower layers of these water areas to purify the water quality of the water area, an air intake port is provided on the suction side of the drive water pump. (2) In the water purification device of (1), an air intake valve is provided at the air intake port, and the opening of the valve is determined by the detection value of a pressure sensor provided on the outlet side of the driving water pump. . (3) In the water purification device of (2), the detection value of the pressure sensor is set to a value at which the driving water pump does not trip. (4) In the water purification device of (1) above, a flow rate adjusting valve is installed immediately before the air intake port.
【０００７】[0007]
【作用】前記（１）の本発明では、駆動水ポンプを運転
することにより、駆動水ポンプ３の吸い込み側は負圧と
なる。駆動水ポンプの吸い込み側に空気取り込み口を設
けているので、大気中の空気は自然に駆動水ポンプの吸
い込み側に取り込まれる。この取り込まれた空気は駆動
水ポンプの吸い込み側に入ると同時に気泡となり、駆動
水ポンプによって水域の下層に送り込まれて水域の表面
近傍の水と共に放出される。このように、空気が駆動水
ポンプの吸い込み側に取り込まれてから下層に放水され
る過程で、気泡の一部は水に溶け込み下層の溶存酸素量
を増やす。また、水に溶け込まれなかった空気は気泡と
して再び水面方向に上昇する際に周囲水を連行して鉛直
混合流を発生する。この鉛直混合流は、安定した密度成
層を破壊する。これによって、水域の下層の水質改善が
効果的に行われる。In the present invention of (1) above, the suction side of the drive water pump 3 becomes a negative pressure by operating the drive water pump. Since the air intake port is provided on the suction side of the driving water pump, air in the atmosphere is naturally taken into the suction side of the driving water pump. The taken-in air enters the suction side of the driving water pump and at the same time becomes air bubbles, which is sent to the lower layer of the water area by the driving water pump and is discharged together with the water near the surface of the water area. Thus, in the process in which air is taken into the suction side of the driving water pump and then discharged to the lower layer, some of the bubbles dissolve in water and increase the amount of dissolved oxygen in the lower layer. Further, the air that has not been dissolved in the water, as air bubbles, entrains the ambient water when rising again in the water surface direction, and generates a vertical mixed flow. This vertical mixed flow destroys the stable density stratification. This effectively improves the water quality of the lower layers of the water area.
【０００８】前記（２）の本発明は、前記（１）の本発
明において、駆動水ポンプの出口側の圧力は取り込まれ
た空気量によって変化するが、これを圧力センサで検知
し、その検出値によって空気取り込み口の空気取り込み
バルブの開度を決定しているために、適正な量の空気を
取り込んで水域の下層に送ることができる。According to the invention of (2) above, in the invention of (1) above, the pressure on the outlet side of the drive water pump changes depending on the amount of air taken in, but this is detected by a pressure sensor and detected. Since the opening of the air intake valve of the air intake port is determined by the value, an appropriate amount of air can be taken and sent to the lower layer of the water area.
【０００９】前記（３）の本発明は、前記（２）の発明
において、空気取り込み口の空気取り込みバルブの開度
を決定する圧力センサの検出値が駆動水ポンプがトリッ
プしない値に設定されているので、空気取り込み口より
取り込まれた空気の量が増加して駆動水ポンプがトリッ
プを起す前に空気取り込みバルブの開放動作が停止さ
れ、駆動水ポンプがトリップすることが防止される。In the invention of the above (3), in the invention of the above (2), the detection value of the pressure sensor for determining the opening degree of the air intake valve of the air intake port is set to a value at which the driving water pump does not trip. Therefore, the opening operation of the air intake valve is stopped before the drive water pump trips because the amount of air taken in from the air intake port increases, and the drive water pump is prevented from tripping.
【００１０】前記（４）の本発明では、前記（１）の本
発明において、空気取り込み口の直前に流量調整弁が設
置されているので、流量調整弁を調整することによって
駆動水ポンプの吸い込み側の水の流速が調整され、これ
によって空気取り込み口より取り込まれる空気の気泡の
径を適当なものに調整することができる。In the invention of (4) above, in the invention of (1) above, since the flow rate adjusting valve is installed immediately before the air intake port, the suction of the drive water pump is adjusted by adjusting the flow rate adjusting valve. The flow velocity of the water on the side is adjusted, whereby the diameter of the air bubbles taken in from the air intake can be adjusted to an appropriate value.
【００１１】[0011]
【実施例】本発明の一実施例を、図１によって説明す
る。本実施例は、図２に示す従来の水質浄化装置におい
て次の構成を付加したものであり、図１において図２に
おけると同一の部分には同一の符号を付し、その説明を
省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. This embodiment is obtained by adding the following configuration to the conventional water purification apparatus shown in FIG. 2. In FIG. 1, the same parts as those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.
【００１２】駆動水ポンプ３と取水口６との間の駆動水
ポンプ３の吸い込み側の配管１３には空気取り込みバル
ブ１０を有する空気取り込み口７が設けられており、ま
た前記配管１３の空気取り込み口７の直前の上流側には
流量調整弁１２が設けられている。駆動水ポンプ３と水
流発生部２との間の駆動水ポンプ３の出口側の配管１４
には圧力センサ１１が設けられ、同圧力センサ１１の検
出値は前記空気取り込みバルブ１０に入力され、この検
出値によって空気取り込みバルブ１０の開度が決定され
るようになっている。また、前記圧力センサ１１の検出
値は、駆動水ポンプ３がトリップを発生する前に空気取
り込みバルブ１０の開放動作を停止するように設定され
ている。なお、図１中矢印は水の流れる方向を示す。An air intake 7 having an air intake valve 10 is provided in a pipe 13 on the suction side of the drive water pump 3 between the drive water pump 3 and the water intake 6, and the air intake of the pipe 13 is provided. A flow rate adjusting valve 12 is provided on the upstream side immediately before the port 7. Piping 14 on the outlet side of the drive water pump 3 between the drive water pump 3 and the water flow generation unit 2
A pressure sensor 11 is provided in the air intake valve 10. The detection value of the pressure sensor 11 is input to the air intake valve 10, and the opening degree of the air intake valve 10 is determined by this detection value. The detection value of the pressure sensor 11 is set so that the opening operation of the air intake valve 10 is stopped before the drive water pump 3 causes a trip. The arrow in FIG. 1 indicates the direction of water flow.
【００１３】以上のように構成された本実施例では、駆
動水ポンプ３の起動後に閉じていた空気取り込みバルブ
１０を開放していくことにより、取水口６より取り込ま
れて配管１３内を流れる表層水の中に大気中の空気が気
泡８として取り込まれる。このようにして、配管１３内
に取り込まれた気泡８は、水と共に駆動水ポンプ３によ
って配管１４を経て水流発生部２から水域の下層に送り
込まれる。このように、空気が配管１３内に取り込まれ
てから水域の下層に送り込まれる過程で、気泡の一部は
水に溶け込み、水域の下層の溶存酸素量を増加すること
ができる。また、水に溶け込まなかった空気は、気泡８
として再び水面方向に上昇する。このように気泡８が上
昇する際には、周囲水を連行して鉛直混合流９が発生
し、この鉛直混合流９によって図２において符号１で示
す安定した密度成層を破壊し、水域の下層の流動性を増
進する。従って、水域の下層の流動性が向上すると共に
充分な量の酸素が水域の下層に送り込まれ、水質の浄化
が効果的に行われることになる。In the present embodiment constructed as described above, by opening the air intake valve 10 which has been closed after the drive water pump 3 is started, the surface layer which is taken in from the water intake port 6 and flows in the pipe 13 is opened. Air in the atmosphere is taken into the water as bubbles 8. In this way, the bubbles 8 taken into the pipe 13 are sent to the lower layer of the water area from the water flow generation unit 2 through the pipe 14 by the driving water pump 3 together with water. Thus, in the process in which air is taken into the pipe 13 and then sent to the lower layer of the water area, some of the bubbles dissolve in the water, and the amount of dissolved oxygen in the lower layer of the water area can be increased. In addition, the air that did not dissolve in the water is
Ascends again to the water surface. When the bubbles 8 rise in this way, ambient water is entrained to generate a vertical mixed flow 9, which destroys the stable density stratification shown by reference numeral 1 in FIG. Improve the liquidity of. Therefore, the fluidity of the lower layer of the water area is improved, and a sufficient amount of oxygen is sent to the lower layer of the water area to effectively purify the water quality.
【００１４】また、空気取り込みバルブ１０を開放して
いくことによって、駆動水ポンプ３の吸い込み側の配管
１３内に取り込まれる空気量が多くなるに伴って駆動水
ポンプ３の出口側の配管１４内の圧力が低下していく。
配管１４内には圧力センサ１１が設けられ、その検出値
によって空気取り込みバルブ１０の開度が決定されるの
で、適正な量の空気を配管１３内に取り込み、水域の下
層に送り込むことができる。Further, by opening the air intake valve 10, as the amount of air taken into the suction side pipe 13 of the drive water pump 3 increases, the inside of the pipe 14 on the outlet side of the drive water pump 3 increases. The pressure of is decreasing.
Since the pressure sensor 11 is provided in the pipe 14 and the opening degree of the air intake valve 10 is determined by the detected value, an appropriate amount of air can be taken into the pipe 13 and sent to the lower layer of the water area.
【００１５】また、配管１３に取り込まれる空気量が増
加していくと、駆動水ポンプ３がトリップを発生する。
圧力センサ１１は、前記のように、取り込まれる空気量
の増加に伴って低下する駆動水ポンプ３の出口側の配管
１４内の圧力を検出し、この検出値によって、駆動水ポ
ンプ３がトリップする前に空気取り込みバルブ１０の開
放動作が停止される。これによって、駆動水ポンプ３の
トリップを自動的に防止することができる。Further, as the amount of air taken into the pipe 13 increases, the drive water pump 3 causes a trip.
As described above, the pressure sensor 11 detects the pressure in the pipe 14 on the outlet side of the drive water pump 3 that decreases with an increase in the amount of air taken in, and the drive water pump 3 trips based on this detected value. Before that, the opening operation of the air intake valve 10 is stopped. As a result, the trip of the driving water pump 3 can be automatically prevented.
【００１６】また、駆動水ポンプ３の吸い込み側の配管
１３内に取り込まれる気泡径の大きさは、空気取り込み
口７での管内水の流速が関係する。そこで本実施例で
は、空気取り込み口７直前の配管１３の部分に流量調整
弁１２を設け、微細気泡を取り込む場合には流量調整弁
１２を絞り込んで流速を上げ、また、そうでない場合に
は流量調整弁１２を開けるという調整を行って気泡径を
変更する。このようにして、本実施例では、流量調整弁
１２によって、取り込まれる気泡８の径を適正なものに
調整することができる。The size of the bubble taken into the suction side pipe 13 of the driving water pump 3 is related to the flow velocity of the water in the pipe at the air intake 7. Therefore, in this embodiment, a flow rate adjusting valve 12 is provided in the portion of the pipe 13 immediately before the air intake port 7, and when fine air bubbles are taken in, the flow rate adjusting valve 12 is narrowed down to increase the flow velocity, and when it is not, the flow rate is increased. The bubble diameter is changed by performing the adjustment of opening the adjusting valve 12. In this way, in this embodiment, the diameter of the bubble 8 taken in can be adjusted to an appropriate value by the flow rate adjusting valve 12.
【００１７】以上の通り本実施例では、駆動水ポンプ３
によって水域の下層中に送り込まれる水のなかに空気を
気泡８として取り込むことによって、水域の下層中の溶
存酸素を増加させると共に、水域の安定した密度成層を
破壊して水域の下層の流動性を向上させることができ
る。また、適切な量の空気量を水域の下層に放出し、駆
動水ポンプ３のトリップを防止し、かつ、取り込まれる
気泡径を適切なものとすることができる。これによっ
て、本実施例は、水域の水質改善を効果的に行うことが
できる。As described above, in this embodiment, the driving water pump 3
By taking air as bubbles 8 into the water sent to the lower layer of the water area, dissolved oxygen in the lower layer of the water area is increased, and stable density stratification of the water area is destroyed to improve the fluidity of the lower layer of the water area. Can be improved. Further, an appropriate amount of air can be discharged to the lower layer of the water area, the trip of the driving water pump 3 can be prevented, and the bubble diameter taken in can be made appropriate. As a result, the present embodiment can effectively improve the water quality of the water area.
【００１８】[0018]
【発明の効果】以上説明したように、本発明は、駆動水
ポンプによって取り込まれて水域の下層に送り込まれる
水域の表面近傍の水に空気を取り込むことにより、空気
を水域の下層に送り込み、かつ、気泡による鉛直方向流
れを発生して水域の安定した密度成層を破壊して水域の
下層の流動性を向上させることができる。As described above, according to the present invention, the air is sent to the lower layer of the water area by taking air into the water near the surface of the water area which is taken in by the driving water pump and sent to the lower layer of the water area, and It is possible to improve the fluidity of the lower layer of the water area by generating a vertical flow due to bubbles and destroying the stable density stratification of the water area.
【００１９】また、水域の下層へ送り込まれる空気の量
を十分なものとし、駆動水ポンプのトリップを防止し、
かつ、適切な径の空気を水域の下層へ送り込むことがで
きる。Further, the amount of air sent to the lower layer of the water area is made sufficient to prevent the drive water pump from tripping,
Moreover, it is possible to send air of an appropriate diameter to the lower layer of the water body.
【００２０】これにより、本発明は、水域の下層の水質
改善を効果的に行うことができる。As a result, the present invention can effectively improve the water quality of the lower layer of the water area.
【図１】本発明の一実施例に係る水質浄化装置の説明図
である。FIG. 1 is an explanatory diagram of a water purification device according to an embodiment of the present invention.
【図２】従来の水質浄化装置の説明図である。FIG. 2 is an explanatory view of a conventional water purification device.
１ 密度成層 ２ 水流発生部 ３ 駆動水ポンプ ４ 周囲水 ５ 整流筒 ６ 取水口 ７ 空気取り込み口 ８ 気泡 ９ 鉛直混合流 １０ 空気取り込みバルブ １１ 圧力センサー １２ 流量調整弁 １３、１４ 配管 1 Density stratification 2 Water flow generation part 3 Driving water pump 4 Ambient water 5 Rectifying cylinder 6 Water intake 7 Air intake 8 Air bubbles 9 Vertical mixed flow 10 Air intake valve 11 Pressure sensor 12 Flow rate adjustment valve 13, 14 Piping
Claims (4)
り込み、これら水域の下層に送り込んで水域の水質を浄
化する水質浄化装置において、前記駆動水ポンプの吸い
込み側に空気取り込み口を設けたことを特徴とする水質
浄化装置。1. A water purification apparatus that takes in water near the surface of a water area into a driving water pump and sends it to the lower layers of these water areas to purify the water quality of the water area, wherein an air intake port is provided on the suction side of the driving water pump. A water purification device characterized in that
ブを設け、同バルブの開度を駆動水ポンプの出口側に設
けた圧力センサの検出値で決定することを特徴とする請
求項１に記載の水質浄化装置。2. The air intake valve is provided at the air intake port, and the opening degree of the valve is determined by a detection value of a pressure sensor provided at the outlet side of the driving water pump. Water purification device.
がトリップしない値に設定してなることを特徴とする請
求項２に記載の水質浄化装置。3. The water purification apparatus according to claim 2, wherein the detection value of the pressure sensor is set to a value at which the driving water pump does not trip.
を設置してなることを特徴とする請求項１に記載の水質
浄化装置。4. The water purification apparatus according to claim 1, wherein a flow rate adjusting valve is installed immediately before the air intake port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2243294A JPH07232194A (en) | 1994-02-21 | 1994-02-21 | Water purifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2243294A JPH07232194A (en) | 1994-02-21 | 1994-02-21 | Water purifying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07232194A true JPH07232194A (en) | 1995-09-05 |
Family
ID=12082540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2243294A Withdrawn JPH07232194A (en) | 1994-02-21 | 1994-02-21 | Water purifying device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07232194A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002346588A (en) * | 2001-05-23 | 2002-12-03 | Hukko:Kk | Water purification method and purification device |
| JP2006305494A (en) * | 2005-04-28 | 2006-11-09 | Ebara Corp | Oxygen dissolving system |
-
1994
- 1994-02-21 JP JP2243294A patent/JPH07232194A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002346588A (en) * | 2001-05-23 | 2002-12-03 | Hukko:Kk | Water purification method and purification device |
| JP2006305494A (en) * | 2005-04-28 | 2006-11-09 | Ebara Corp | Oxygen dissolving system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010508 |