JPH0240210A - Filter - Google Patents
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- Publication number
- JPH0240210A JPH0240210A JP63190562A JP19056288A JPH0240210A JP H0240210 A JPH0240210 A JP H0240210A JP 63190562 A JP63190562 A JP 63190562A JP 19056288 A JP19056288 A JP 19056288A JP H0240210 A JPH0240210 A JP H0240210A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- fiber
- fibers
- solid particles
- conductive
- 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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- 239000000835 fiber Substances 0.000 claims abstract description 58
- 239000002245 particle Substances 0.000 claims abstract description 14
- 239000000919 ceramic Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 abstract description 28
- 238000001914 filtration Methods 0.000 abstract description 18
- 239000012530 fluid Substances 0.000 abstract description 10
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 230000008929 regeneration Effects 0.000 abstract description 5
- 238000011069 regeneration method Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000007789 gas Substances 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 239000011343 solid material Substances 0.000 abstract description 2
- 238000004804 winding Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- 239000012777 electrically insulating material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- DTDCCPMQHXRFFI-UHFFFAOYSA-N dioxido(dioxo)chromium lanthanum(3+) Chemical compound [La+3].[La+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O DTDCCPMQHXRFFI-UHFFFAOYSA-N 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910021344 molybdenum silicide Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Landscapes
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野コ
本発明は炭素その他の可燃固形物を含む流体のフィルタ
ーに関するものである。更に詳細には、流体を高温で濾
過処理したり、トラップされた固形物を高温で焼却処理
するのに特に好適なフィルターに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to filters for fluids containing carbon and other combustible solids. More specifically, the present invention relates to a filter particularly suitable for filtering fluids at high temperatures and incinerating trapped solids at high temperatures.
[従来技術]
固形粒子を含むガス又は液体の被濾過流体から該固形粒
子を除去するのに簡便で最もよく用いられる方法にフィ
ルターによる濾過がある。この方法で被濾過流体が高温
で且つ濾過も高温で実施する必要性のある場合は、フィ
ルター基体を収納した容器ごと一定温度に保つため外部
から加熱し、厳密に温度制御することが必要である。即
ち高温濾過において、一般に濾過されな固形物は高温で
取り除かないと、濾過時間が短いとかフィルターの再生
が困難であるという欠点があり、また、濾過固形物が有
用な場合、固形物の収量が少ないという欠点がある。そ
の理由は濾過処理過程の温度変化により濾過固形物がフ
ィルター材料に固着したり、固形物同士が触着するため
である。このような場合は、濾過温度を一定に保つため
にフィルターを外部から加熱制御しなければならない、
また、固体粒子が不用な場合の濾過では、フィルターが
再生使用可能なことは実用上大切である。再生法として
固体が可燃物の場合、使用したフィルターを燃焼炉で焼
却処理したり、燃料を添加して燃やす等の方法がとられ
ている。高温濾過では上記の如くフィルターに固体が固
着し再生が困難な場合が多く、この時はフィルターは使
い捨てにせざるを得ない。[Prior Art] Filtration using a filter is a simple and most commonly used method for removing solid particles from a gaseous or liquid fluid to be filtered containing solid particles. When using this method, if the fluid to be filtered is at a high temperature and it is necessary to perform filtration at a high temperature, it is necessary to heat the container containing the filter base from the outside and strictly control the temperature to maintain a constant temperature. . In other words, in high-temperature filtration, unless the solids that are not filtered are removed at high temperature, the filtration time is short and it is difficult to regenerate the filter. The disadvantage is that there are few. The reason for this is that the filtered solids stick to the filter material or the solids come into contact with each other due to temperature changes during the filtration process. In such cases, the filter must be heated externally to maintain a constant filtration temperature.
Furthermore, in filtration where solid particles are not required, it is practically important that the filter can be reused. If the solid is combustible, methods of recycling include incinerating the used filter in a combustion furnace, or adding fuel and burning it. As mentioned above, in high-temperature filtration, solids often stick to the filter and regeneration is difficult, and in this case the filter has no choice but to be disposable.
[発明が解決しようとする課題]
しかし、濾過処理温度を高温、特に500℃以上、で且
つ一定に制御することはかなり大がかりな付属設備を必
要とし、特に濾過された固形物が不要な場合は除去コス
トが高くつき不経済である。また、フィルターの再生に
おいて焼却処理すると、フィルターに堆積した相当量の
可燃性固形物が次々と自燃するため処理時の温度が15
00℃にも達し、フィルターの構成材料が損傷するとい
う問題がある。[Problems to be Solved by the Invention] However, controlling the filtration temperature at a high temperature, particularly 500°C or higher, and at a constant level requires fairly large-scale attached equipment, especially when the filtered solids are not required. Removal costs are high and uneconomical. In addition, when incinerating the filter during filter regeneration, a considerable amount of combustible solids accumulated on the filter self-combust one after another, resulting in a temperature of 15% during treatment.
There is a problem in that the temperature reaches as high as 00°C and the constituent materials of the filter are damaged.
本発明は、かかる高温濾過に適し、また、フィルターの
燃焼処理による再生で損傷することのない新規なフィル
ターを提供しようとするものである。The present invention aims to provide a novel filter that is suitable for such high-temperature filtration and that is not damaged by regeneration through filter combustion treatment.
[課題を解決するための手段]
上記の課題は、実質的に連続した導電発熱性繊維を、少
なくとも表面が電気絶縁性である多孔質円筒状基体の外
周に螺旋状に巻上げたフィルターであって、当該フィル
ターの両端部に電極を配して、上記繊維に通電すること
により該繊維が発熱するようにしたことを特徴とする本
発明に係るフィルターによって達成される。[Means for Solving the Problem] The above problem is to provide a filter in which substantially continuous conductive heat-generating fibers are spirally wound around the outer periphery of a porous cylindrical base whose surface is electrically insulating at least. This is achieved by the filter according to the present invention, characterized in that electrodes are disposed at both ends of the filter so that the fibers generate heat when electricity is applied to the fibers.
本発明のフィルターの主要部は、少なくとも表面が電気
絶縁性の多孔質円筒状基体と、その周りに巻上げた導電
発熱性繊維、及び、該繊維に電流を通じるための一対の
電極によって構成される。The main part of the filter of the present invention is composed of a porous cylindrical substrate whose surface is electrically insulating at least, a conductive heating fiber wound around the substrate, and a pair of electrodes for passing current through the fiber. .
第1図は本発明のフィルターの例を示す正面図であり、
第2図(a)および(b)は、それぞれ断面図である0
図において1は導電発熱性繊維、2は多孔質円筒状基体
、3a、3bは一対の電極を示す。FIG. 1 is a front view showing an example of the filter of the present invention,
FIGS. 2(a) and (b) are cross-sectional views, respectively.
In the figure, 1 is a conductive heating fiber, 2 is a porous cylindrical substrate, and 3a and 3b are a pair of electrodes.
導電発熱性繊維1としては、導電性セラミック繊維が好
ましいが、耐熱性の金属繊維でもよい。As the conductive heating fiber 1, conductive ceramic fiber is preferable, but heat-resistant metal fiber may also be used.
導電性セラミック繊維としては、炭化珪素、珪化モリブ
デン、ランタンクロメート、炭化チタニウム、ジルコニ
ア等の繊維があげられるが、なかでも、珪素と炭素との
結合(−3i−C−)を主成分とする炭化珪素(シリコ
ンカーバイト)系繊維が、電気的特性および耐熱性の双
方に優れているため、特に好ましい、かかる繊維は、例
えば米国特許第4,743,411号に記載のポリカル
ボシラスチレン共重合体を前駆体とする方法によって工
業的に有利に製造することができる。この繊維の製造に
際し、前駆体ポリマーに−TiO−−ZrOB等を導入
してもよい。Examples of conductive ceramic fibers include fibers made of silicon carbide, molybdenum silicide, lanthanum chromate, titanium carbide, and zirconia. Silicon (silicon carbide) based fibers are particularly preferred because they have excellent electrical properties and heat resistance. It can be industrially advantageously produced by a method using a combination as a precursor. When producing this fiber, -TiO--ZrOB or the like may be introduced into the precursor polymer.
繊維の太さはデニールにして0.1〜100 De程度
が適当である。繊維の導電度は単繊維の比抵抗500〜
1200℃において10−4〜103Ω・口特に10°
3〜102Ω・■であることが好ましい、基体上の繊維
の巻き密度は濾過効果を考えてm離間の目開きが0.1
〜500ミクロン、゛特に1〜50ミクロンとなるよう
に巻上げるのが好ましい0巻上げた繊維層の厚みは適当
に選ぶことが出来るが、一般に0.5〜20市程度が好
ましい。The appropriate thickness of the fiber is about 0.1 to 100 De in denier. The conductivity of the fiber is the specific resistance of a single fiber of 500~
10-4 to 103Ω at 1200°C, especially 10°
It is preferable that the winding density of the fibers on the substrate is 3 to 102 Ω・■, considering the filtration effect, and the mesh opening of m distance is 0.1.
The thickness of the rolled fiber layer can be selected appropriately, but it is generally preferred to have a thickness of 0.5 to 20 microns.
繊維の断面は通常の円形に限らず、まゆ形、トライロー
バル形等の非円形でもよい、また、十分な耐熱性のある
導電性繊維であれば2種以上組合わせて使用してもよい
。The cross section of the fibers is not limited to the usual circular shape, but may also be non-circular, such as a cocoon shape or a trilobal shape, and two or more types of conductive fibers may be used in combination as long as they have sufficient heat resistance.
例えば、炭化珪素繊維と炭化チタニウム繊維やジルコニ
ア繊維とを組合わせて使用することもできる。For example, a combination of silicon carbide fibers, titanium carbide fibers, or zirconia fibers may be used.
いずれの場合も各繊維は実質的に連続していることが必
要であり、短繊維では導電性が劣るため好ましくない。In either case, each fiber must be substantially continuous, and short fibers are not preferred because they have poor conductivity.
一方、繊維1を巻きつける基体となる多孔質円筒2は、
少くともその円筒表面(繊維巻きっけ部)が電気絶縁性
を有する耐熱性の物質からなり、繊維層よりも粗い目開
きの連通孔を有する流体透過性の多孔質円筒である。該
円筒2は第2図の如く中心部に中空部を有するのが好ま
しい、被濾過流体は、通常、繊維層の外側から供給し、
固形物は繊維層で濾過され、濾過された流体は該円筒の
多孔質層を通過して円筒の中心部に設けた中空部から外
部に取り出されるが、被濾過流体をその逆方向に流して
もよい。この多孔質円筒2の材質は一般に電気絶縁性の
耐熱セラミックが好ましく用いられるが、電気絶縁性の
他の材質であっても差し支えない、この円筒は第2図(
a)のごとく全体を電気絶縁性物質としてもよく、たま
、第2図(b)のごとく、中心部に近い部分に電気導電
性の耐熱性金属材料2bを用い、その外側に電気絶縁性
耐熱材料2aを被覆させて用いることも出来る。On the other hand, the porous cylinder 2 that becomes the base material around which the fiber 1 is wound is
At least the cylindrical surface (fiber-wrapped portion) is made of a heat-resistant material with electrical insulation properties, and is a fluid-permeable porous cylinder having communication holes with a coarser opening than the fiber layer. It is preferable that the cylinder 2 has a hollow part in the center as shown in FIG. 2. The fluid to be filtered is usually supplied from outside the fiber layer,
The solids are filtered through the fibrous layer, and the filtered fluid passes through the porous layer of the cylinder and is taken out from the hollow part provided in the center of the cylinder. Good too. Generally, electrically insulating heat-resistant ceramic is preferably used as the material for this porous cylinder 2, but other electrically insulating materials may also be used.
As shown in a), the entire body may be made of an electrically insulating material, or as shown in FIG. It can also be used by covering it with the material 2a.
本発明のフィルターは、さらに両端部に上記の繊維1に
通電するための一対の電極3a、3bを設けている。こ
れらの電極3a、3bは繊維1より電気抵抗の小さい耐
熱性の金属で構成され、通常は銀、@又はその合金が使
用される。電極3a。The filter of the present invention is further provided with a pair of electrodes 3a and 3b at both ends for supplying electricity to the fiber 1 described above. These electrodes 3a, 3b are made of a heat-resistant metal having a lower electric resistance than the fiber 1, and usually silver, @, or an alloy thereof is used. Electrode 3a.
3bは第1図のように両端部の全体に亙り設けるのが好
ましいが、繊維の全面に通電発熱させることが可能であ
る限り部分的に設けてもよい。3b is preferably provided over the entirety of both ends as shown in FIG. 1, but may be provided partially as long as it is possible to energize the entire surface of the fiber and generate heat.
電極3a、3bは必要時に電源4に接続され、フィルタ
ー表面の繊維に電流を通じるようになっている。The electrodes 3a, 3b are connected to a power source 4 when necessary, so that current can be passed through the fibers on the surface of the filter.
[作用]
本発明のフィルターにおいては、固形粒子を含む被濾過
流体は、通常、繊維を巻き付けた層の外側から導入され
、a離層と多孔質中空円筒を通って円筒の中心部に至り
、その間に固形粒子は繊維層で捕捉される。[Function] In the filter of the present invention, the fluid to be filtered containing solid particles is usually introduced from the outside of the layer around which the fibers are wound, passes through the delamination a and the porous hollow cylinder, and reaches the center of the cylinder. During this time, solid particles are trapped in the fiber layer.
かくして濾過に使用したフィルターには、その表面近傍
に固形粒子が堆積し、適当な堆積量に達した時に使用を
止め、固形粒子を取り除いて再使用する。堆積固形粒子
の除去方法において、固形粒子が可燃性の場合は、フィ
ルターの両端の電極に電源を接続して繊維層に電流を通
じることにより、フィルターを固形物の燃焼温度以上に
発熱せしめ、また、同時に酸素を含むガスをフィルター
に供給することで、固形物を燃焼させて除去することか
出来る。In this way, solid particles accumulate near the surface of the filter used for filtration, and when a suitable amount of accumulation is reached, use is stopped, the solid particles are removed, and the filter is reused. In the method for removing accumulated solid particles, if the solid particles are flammable, a power source is connected to the electrodes at both ends of the filter and current is passed through the fiber layer to cause the filter to generate heat above the combustion temperature of the solids. At the same time, by supplying oxygen-containing gas to the filter, solids can be burned and removed.
本発明のフィルターの別の使用態様として、被濾過流体
を高温で濾過する必要のある場合、フィルター電極に電
流を通じて、フィルターを所望の温度に保った状態で濾
過を実施し、固形物を除去することが出来る。In another use of the filter of the present invention, when the fluid to be filtered needs to be filtered at a high temperature, the filter is maintained at a desired temperature by passing an electric current through the filter electrode to perform the filtration to remove solids. I can do it.
[発明の効果]
以上のごとき本発明のフィルターは、濾過部を構成する
繊維自体の通電発熱により濾過を所望の温度に制御する
ことができ、また、濾過された固形物の除去において、
通電発熱により固形物の自燃温度以上に加熱し燃焼除去
することが出来る。[Effects of the Invention] The filter of the present invention as described above can control filtration to a desired temperature by heating the fibers themselves when energized, and in removing filtered solids,
It is possible to heat the solid material to a temperature higher than its self-combustion temperature and burn it off by generating electricity.
更に本発明のフィルターは、濾過された堆積固形物の量
をコントロールすれば、上記燃焼の温度がフィルターの
耐熱温度以下に保つことが可能で、従って、再生処理に
おけるフィルター繊維の損傷が少なく、フィルターの耐
久性を著しく延長させることが出来る。という優れた効
果を有する。Furthermore, in the filter of the present invention, by controlling the amount of filtered deposited solids, it is possible to maintain the combustion temperature below the filter's heat resistance temperature. The durability of can be significantly extended. It has this excellent effect.
[実施例]
米国特許第4,743,411号記載の方法で製造した
ポリカルボシラスチレン共重合体を前駆体とするSiC
繊維(1000℃における比抵抗=10″2Ω・CII
I)を外径20市厚み480市の電気絶縁性多孔質セラ
ミックの中空円筒に目開き50μmにて稜角30度で需
旋状に巻上げ、この両端に一対の銅製電極を取付けて繊
維と接続し、フィルターを作製した。このフィルターを
ディーゼルエンジンの排気カスの濾過用に使用した。2
時間使用後、このフィルターへの排気ガスの供給をとめ
、フィルターの電極を電源につなぎ20Vの電流を通じ
て該フィルターの繊維を約1000°Cに発熱させると
同時に該フィルターに空気を供給した。繊維に付着して
いる炭素は焼却され約3分後に実質的に炭素を含まない
フィルターが再生された。この再生フィルターに再び排
気ガスを通すと、効率的に濾過を行うことができた。[Example] SiC using a polycarbosilastyrene copolymer produced by the method described in U.S. Patent No. 4,743,411 as a precursor
Fiber (specific resistance at 1000℃=10″2Ω・CII
I) was rolled up in a spiral shape at an edge angle of 30 degrees with an opening of 50 μm in a hollow cylinder of electrically insulating porous ceramic with an outer diameter of 20 mm and a thickness of 480 mm, and a pair of copper electrodes were attached to both ends of the coil to connect it to the fiber. , a filter was made. This filter was used for filtering exhaust residue from a diesel engine. 2
After using the filter for a period of time, the supply of exhaust gas to the filter was stopped, and the electrodes of the filter were connected to a power source, and a current of 20 V was applied to heat the fibers of the filter to about 1000° C. At the same time, air was supplied to the filter. The carbon adhering to the fibers was incinerated and after about 3 minutes the filter was regenerated substantially free of carbon. When the exhaust gas was passed through this regeneration filter again, efficient filtration was possible.
添附図面は本発明の実施態様を例示するもので第1図は
本発明に係るフィルターの正面図、第2図(a)および
第2図(b)はそれぞれ断面図である1・・・導1発熱
性繊維
2・・・電気絶縁性多孔質円筒状基体
2a・・・電気絶縁性多孔質層
2b・・・導電性多孔質円筒状基体
3a、3b・・・電極
4・・・電源
特許出願人 帝 人 株 式 会 社The attached drawings illustrate embodiments of the present invention, and FIG. 1 is a front view of a filter according to the present invention, and FIGS. 2(a) and 2(b) are sectional views, respectively. 1 Exothermic fiber 2... Electrically insulating porous cylindrical substrate 2a... Electrically insulating porous layer 2b... Conductive porous cylindrical substrate 3a, 3b... Electrode 4... Power supply patent Applicant Teijin Ltd.
Claims (5)
表面が電気絶縁性の多孔質円筒状基体の外周に螺旋状に
巻上げたフィルターであって、上記繊維に通電すること
により該繊維が発熱するようにしたことを特徴とするフ
ィルター。(1) A filter in which substantially continuous conductive heat-generating fibers are spirally wound around the outer periphery of a porous cylindrical base whose surface is electrically insulating at least, and when the fibers are energized, the fibers generate heat. A filter characterized by:
0ミクロン(μm)である請求項(1)記載のフィルタ
ー。(2) The opening between the spirally wound fibers is 0.1 to 50
The filter according to claim 1, which has a particle diameter of 0 microns (μm).
求項(1)記載のフィルター。(3) The filter according to claim (1), wherein the conductive heating fiber is a conductive ceramic fiber.
−C−)を主成分とするセラミックからなる繊維である
請求項(3)記載のフィルター。(4) The conductive ceramic fiber has a silicon-carbon bond (-Si
The filter according to claim 3, which is a fiber made of ceramic whose main component is -C-).
が500〜1200℃の温度において10^−^4〜1
0^3Ω・cmの値を有するものを使用する請求項(3
)又は(4)記載のフィルター。(5) As a conductive ceramic fiber, the specific resistance of the single fiber is 10^-^4 to 1 at a temperature of 500 to 1200°C.
Claim (3) using a material having a value of 0^3Ω・cm
) or the filter described in (4).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63190562A JPH0240210A (en) | 1988-08-01 | 1988-08-01 | Filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63190562A JPH0240210A (en) | 1988-08-01 | 1988-08-01 | Filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0240210A true JPH0240210A (en) | 1990-02-09 |
Family
ID=16260131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63190562A Pending JPH0240210A (en) | 1988-08-01 | 1988-08-01 | Filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0240210A (en) |
-
1988
- 1988-08-01 JP JP63190562A patent/JPH0240210A/en active Pending
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