JPH062210B2 - Ultra-precision virus removal filter and ultra-precision sterilization dust removal filter - Google Patents
Ultra-precision virus removal filter and ultra-precision sterilization dust removal filterInfo
- Publication number
- JPH062210B2 JPH062210B2 JP62103107A JP10310787A JPH062210B2 JP H062210 B2 JPH062210 B2 JP H062210B2 JP 62103107 A JP62103107 A JP 62103107A JP 10310787 A JP10310787 A JP 10310787A JP H062210 B2 JPH062210 B2 JP H062210B2
- Authority
- JP
- Japan
- Prior art keywords
- hollow fiber
- air
- fiber membrane
- ultra
- precision
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000428 dust Substances 0.000 title claims description 14
- 241000700605 Viruses Species 0.000 title claims description 11
- 238000004659 sterilization and disinfection Methods 0.000 title description 10
- 230000001954 sterilising effect Effects 0.000 title description 5
- 239000012510 hollow fiber Substances 0.000 claims description 43
- 239000012528 membrane Substances 0.000 claims description 42
- 239000011148 porous material Substances 0.000 claims description 11
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 7
- 230000000249 desinfective effect Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 241000894006 Bacteria Species 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000012466 permeate Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229920002239 polyacrylonitrile Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002980 postoperative effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
- B01D63/069—Tubular membrane modules comprising a bundle of tubular membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
- B01D63/024—Hollow fibre modules with a single potted end
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
- B01D63/031—Two or more types of hollow fibres within one bundle or within one potting or tube-sheet
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、エアー中に混在している塵や菌をほとんど完
璧に除去しうる超精密ウィルス除去フィルター及び超精
密除菌除塵フィルターに関するものであり、クリーンル
ーム用のフィルター、術後の酸素注入フィルター、人工
心肺用の酸素バブリング用のフィルター同酸素ハブリン
グのエアー抜きフィルター、透析用の圧力モニターへの
接続用フィルター、生薬加工時のエアーフィルター、
菌、塵、ウィルスを享受する工程用のフィルター等の幅
広い用途に利用できる。Description: TECHNICAL FIELD The present invention relates to an ultra-precision virus removal filter and an ultra-precision sterilization dust removal filter that can almost completely remove dust and bacteria mixed in air. Yes, filters for clean rooms, post-operative oxygen injection filters, oxygen bubbling filters for heart-lung machines, air vent filters for the same oxygen hub ring, filters for connection to pressure monitors for dialysis, air filters for processing crude drugs,
It can be used in a wide range of applications such as filters for processes that enjoy bacteria, dust, and viruses.
（従来技術および発明が解決しようとする問題点） 例えば医薬用具の組立て、医薬品の製造、食品の包装等
を行なうクリーンルームにおいて、除菌、除塵フィルタ
ーが設置されている。(Problems to be Solved by the Prior Art and Invention) For example, a sterilization and dust removal filter is installed in a clean room for assembling pharmaceutical tools, manufacturing pharmaceuticals, packaging foods, and the like.
これらの除菌、除塵フィルターは、セルロース、テフロ
ン、綿等からなるフィルター素材を平膜状に折りたたん
で重ね合せるか又は、コイル状に巻回してハウジング本
体に配置していた。In these sterilization and dust removal filters, a filter material made of cellulose, Teflon, cotton or the like is folded into a flat film and superposed on each other, or wound in a coil and arranged in the housing body.
このようなフィルター素材は０．２μ（２０００Å）と
目が粗く、また重ね合せ又は、コイル状に巻回して配置
し、ハウジングの一端から他端へ一方通行にエアーを通
すように形成されているので、エアーの濾過効率が必ず
しも充分でなく長時間使用しているとフィルター素材表
面に塵が集積するため目詰りが生じやすくなり操作性に
難があった。Such a filter material has a coarse mesh of 0.2 μ (2000 Å) and is arranged so as to be superposed or wound in a coil shape so that air is passed in one direction from one end to the other end of the housing. Therefore, the filtration efficiency of air is not always sufficient, and if it is used for a long time, dust accumulates on the surface of the filter material, which easily causes clogging, which is difficult to operate.
また膜の面積が充分に活用されず、エアーを透過する膜
の表面積が小さく、エアーの透過量の低い等の問題点が
あった。Further, the area of the membrane is not fully utilized, the surface area of the membrane that allows air to pass through is small, and the amount of permeation of air is low.
また特開昭５４−１０４０８２号公報にループ状に束ね
た中空繊維束を被濾過気体の出入口を設けたハウジング
内に収納し、被濾過気体を入口より導入して、前記中空
繊維束を透過させて中空繊維束の開口部より濾過気体を
外部へ取り出す気体の濾過装置が記載されている。Further, in Japanese Patent Laid-Open No. 54-104082, a hollow fiber bundle bundled in a loop is housed in a housing provided with an inlet / outlet of a gas to be filtered, and the gas to be filtered is introduced through the inlet to allow the hollow fiber bundle to permeate. And a gas filtering device for taking out filtered gas to the outside from the opening of the hollow fiber bundle.
この濾過装置は中空繊維束をループ状に束ねているため
ハウジングの単位容積あたりの中空糸膜の充填密度を大
きくすることができず、大きな濾過面積を確保すること
ができない。さらに中空糸膜の材質として疏水性のポリ
プロピレン、ポリエチレン、親水性のポリアクリロニト
リル等が記載されているが、親水性のポリアクリロニト
リルは水のミストを含んだ気体を濾過する際に水滴等が
中空糸膜の微小空孔中へ浸入し気体の濾過速度が著しく
低下する旨が指摘されている（同公報、第３項右上欄第
２行から第８行、尚、疎水性のポリプロピレン、ポリエ
チレンも水滴が中空糸膜の空孔に累積的に付着すると目
詰まりの問題が生じるものと想定される）。Since this filtration device bundles hollow fiber bundles in a loop, it is not possible to increase the packing density of the hollow fiber membranes per unit volume of the housing, and it is not possible to secure a large filtration area. Furthermore, hydrophobic polypropylene, polyethylene, hydrophilic polyacrylonitrile, etc. are described as the material of the hollow fiber membrane, but hydrophilic polyacrylonitrile is a hollow fiber in which water droplets etc. are generated when filtering gas containing water mist. It has been pointed out that gas permeates into the micropores of the membrane and the filtration rate of the gas is significantly reduced (the same publication, item 3, upper right column, lines 2 to 8; hydrophobic polypropylene and polyethylene are also water droplets). It is assumed that the problem of clogging will occur if the particles are cumulatively attached to the pores of the hollow fiber membrane).
そこで本発明者は以上の課題を解決するために鋭意検討
を重ねた結果次の発明に到達した。Therefore, the present inventor has earnestly studied to solve the above problems, and as a result, arrived at the following invention.
（問題点を解決するための手段） 本発明は、（１）ポアーサイズが１００Å以下に設定さ
れかつエチレン−ビニルアルコール共重合体からなる中
空糸膜がストレート状に束ねられ、該中空糸膜は側部に
エアー導入口を形成したハウジング内に収納され、前記
中空糸膜の両端部は前記ハウジングの両端部に固定さ
れ、前記ハウジングの一端に前記中空糸膜のエアー通路
と連通するエアー導出口が形成された超精密ウィルス除
去フィルターを提供する。(Means for Solving the Problems) In the present invention, (1) the pore size is set to 100 Å or less, and hollow fiber membranes composed of an ethylene-vinyl alcohol copolymer are bundled in a straight shape, and the hollow fiber membranes have side surfaces. The hollow fiber membrane is housed in a housing having an air inlet formed therein, both ends of the hollow fiber membrane are fixed to both ends of the housing, and one end of the housing has an air outlet opening communicating with the air passage of the hollow fiber membrane. Provided is a formed ultra-precision virus removal filter.
（２）ポアーサイズが２０００Å以下に設定されかつエ
チレン−ビニルアルコール共重合体からなる中空糸膜が
ストレート状に束ねられ、該中空糸膜は側部にエアー導
入口を形成したハウジング内に収納され、前記中空糸膜
の両端部は前記ハウジングの両端部に固定され、前記ハ
ウジングの一端に前記中空糸膜のエアー通路と連通する
エアー導出口が形成された超精密除菌除塵フィルターを
提供する。(2) The pore size is set to 2000 liters or less, and hollow fiber membranes made of an ethylene-vinyl alcohol copolymer are bundled in a straight shape, and the hollow fiber membranes are housed in a housing having an air inlet on its side. Provided is an ultra-precision disinfection filter, wherein both ends of the hollow fiber membrane are fixed to both ends of the housing, and an air outlet communicating with an air passage of the hollow fiber membrane is formed at one end of the housing.
（作用） エアー導入口からハウジング内に導入されたエアーは、
中空糸膜壁を介して濾過される。エアーの中に混在して
いるウィルス、細菌、塵は中空糸膜を透過できず中空糸
膜表面に付着する。濾過されたエアーは、中空糸膜内の
エアー通路、エアー導出口を介して導出される。(Operation) The air introduced into the housing from the air inlet is
It is filtered through the hollow fiber membrane wall. Viruses, bacteria and dust mixed in the air cannot permeate the hollow fiber membrane and adhere to the surface of the hollow fiber membrane. The filtered air is discharged through an air passage and an air outlet in the hollow fiber membrane.
（実施例） 第１図は本発明の超精密ウィルス除去フィルター１（超
精密除菌除塵フィルターも同じ）の概略図を示す。図
中、２はハウジングで中腹部にエアー導入口３または９
が突設される。(Example) FIG. 1 shows a schematic diagram of an ultraprecision virus removal filter 1 of the present invention (the same applies to an ultraprecision sterilization and dust removal filter). In the figure, 2 is a housing, which is an air inlet 3 or 9 in the middle abdomen.
Is projected.
ハウジング２の内部にはポアーサイズが１００Å以下
（超精密除菌除塵フィルターの場合は２０００Å以下）
のストレート状に束ねられた中空糸膜４が配置され、そ
の両端部は充填剤５により固定され、キャップ６、７が
装着されている。中空糸膜４の一端はキャップ６により
閉塞され、他方の一端はキャップ７に突設されたエアー
導出口８を介して開通されている。The inside of the housing 2 has a pore size of 100Å or less (2000 Å or less in the case of the ultra-precision disinfection filter)
The hollow fiber membranes 4 which are bundled in a straight shape are arranged, both ends of which are fixed by a filler 5, and caps 6 and 7 are attached. One end of the hollow fiber membrane 4 is closed by a cap 6, and the other end is opened through an air outlet port 8 projecting from the cap 7.
エアー導入口３、９はどちらか一方が閉じられている。One of the air inlets 3 and 9 is closed.
使用に際しては、エアー導入口９を閉じて、エアーをエ
アー導入口３からハウジング２内に導入するとエアー中
に混在しているウィルス、菌、塵等の中空糸膜４のポア
ーよりも小さなものは透過できず中空糸膜４表面に付着
する。In use, when the air introduction port 9 is closed and air is introduced into the housing 2 through the air introduction port 3, those smaller than the pores of the hollow fiber membrane 4 such as viruses, bacteria and dust mixed in the air are It cannot be permeated and adheres to the surface of the hollow fiber membrane 4.
他方中空糸膜を透過したエアーは中空糸膜内のエアー通
路（中空糸膜の内部空間、特に図示せず）を通って、エ
アー導出口８を介して排出される。また膜表面がよごれ
た場合、エアー導出口８を閉じてエアー導出口９を開放
してエアー導出口３からエアー導出口９へエアーを排出
することもできる。またエアー導出口８からの逆エアー
洗浄も可能なシステムにも組むことができる。On the other hand, the air that has permeated the hollow fiber membrane passes through an air passage (internal space of the hollow fiber membrane, not shown) in the hollow fiber membrane and is discharged through the air outlet port 8. Further, when the film surface is dirty, the air outlet 8 can be closed and the air outlet 9 can be opened to discharge the air from the air outlet 3 to the air outlet 9. Further, it can be assembled into a system that can also perform reverse air cleaning from the air outlet 8.
本発明は中空糸膜４としてエチレン−ビニルアルコール
共重合体が使用される。In the present invention, an ethylene-vinyl alcohol copolymer is used as the hollow fiber membrane 4.
エチレン−ビニルアルコール共重合体の中空糸膜はポア
ーサイズを１００Å以下に容易に形成でき、このポアー
によるエアーの透過性能に優れ、特に水蒸気透過性能が
１４００（Ｋｇ・ｍ／ｍ２・２４ｈｒ）（同じ親水性の
ポリアクリロニトリルの７倍）もあるため水分を含んだ
エアーでも目詰まりすることなく安定して濾過できる。
このため安定した濾過性能を維持しながらウィルス以上
の大きさを持つ菌を透過しないので容易に除菌でき、完
璧に近い無菌エアーを提供できる。The ethylene-vinyl alcohol copolymer hollow fiber membrane can be easily formed with a pore size of 100 Å or less, and the pores have excellent air permeation performance, especially water vapor permeation performance of 1400 (Kg · m / m 2 · 24 hr) (same). Since it is 7 times more hydrophilic than polyacrylonitrile), it is possible to stably filter even air containing water without clogging.
For this reason, bacteria having a size larger than a virus do not permeate while maintaining stable filtration performance, so that bacteria can be easily removed and a nearly perfect sterile air can be provided.
また大口径のエチレン−ビニルアルコール共重合体の中
空糸膜は、エアー通過量が増えポアーサイズも2000Å以
下、好ましくは1000Å以下に形成できるので除菌除塵用
フィルター素材としても好適である。Further, a large diameter ethylene-vinyl alcohol copolymer hollow fiber membrane is suitable as a filter material for disinfection and dust removal because it has an increased air passage amount and a pore size of 2000 Å or less, preferably 1000 Å or less.
（発明の効果） 以上説明したように、本発明は中空糸膜を収容するハウ
ジングの単位容積あたりの中空糸膜の充填密度（濾過面
積）が大きくかつ中空糸膜のポアーサイズも微小に設定
しているので、高純度のエアーを得ることができる。(Effects of the Invention) As described above, according to the present invention, the packing density (filtration area) of the hollow fiber membrane per unit volume of the housing that houses the hollow fiber membrane is large, and the pore size of the hollow fiber membrane is set to be small. Therefore, high-purity air can be obtained.
また水分を含んだエアーを濾過する際も膜の目詰りがほ
とんど生じないのでエアーを定圧で濾過でき操作性が抜
群である。Further, when the air containing water is filtered, the membrane is hardly clogged so that the air can be filtered at a constant pressure and the operability is excellent.
【図面の簡単な説明】 第１図は、本発明の超精密ウイルス除去（除菌除塵）フ
ィルターの概略図を示す。 図中、１は超精密ウイルス除去（除菌除塵）フィルタ
ー、２はハウジング、３及び９はエアー導入口、４は中
空糸膜、５は充填剤、６及び７はキャップ、８はエアー
導出口を示す。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a schematic view of an ultraprecision virus removal (disinfection / dust removal) filter of the present invention. In the figure, 1 is an ultra-precision virus removal (disinfection / dust removal) filter, 2 is a housing, 3 and 9 are air inlets, 4 is a hollow fiber membrane, 5 is a filler, 6 and 7 are caps, 8 is an air outlet. Indicates.
Claims (2)
つエチレン−ビニルアルコール共重合体からなる中空糸
膜がストレート状に束ねられ、該中空糸膜は側部にエア
ー導入口を形成したハウジング内に収納され、前記中空
糸膜の両端部は前記ハウジングの両端部に固定され、前
記ハウジングの一端に前記中空糸膜のエアー通路と連通
するエアー導出口が形成されたことを特徴とする超精密
ウィルス除去フィルター。1. A hollow fiber membrane having a pore size of 100 liters or less and made of an ethylene-vinyl alcohol copolymer is bundled in a straight shape, and the hollow fiber membrane is housed in a housing having an air inlet on its side. Both ends of the hollow fiber membrane are fixed to both ends of the housing, and an air outlet communicating with an air passage of the hollow fiber membrane is formed at one end of the housing to remove an ultraprecision virus. filter.
かつエチレン−ビニルアルコール共重合体からなる中空
糸膜がストレート状に束ねられ、該中空糸膜は側部にエ
アー導入口を形成したハウジング内に収納され、前記中
空糸膜の両端部は前記ハウジングの両端部に固定され、
前記ハウジングの一端に前記中空糸膜のエアー通路と連
通するエアー導出口が形成されたことを特徴とする超精
密除菌塵フィルター。2. Hollow fiber membranes having a pore size of 2000 liters or less and made of an ethylene-vinyl alcohol copolymer are bundled in a straight shape, and the hollow fiber membranes are housed in a housing having an air inlet on its side. Both ends of the hollow fiber membrane are fixed to both ends of the housing,
An ultra-precision disinfecting dust filter, wherein an air outlet communicating with the air passage of the hollow fiber membrane is formed at one end of the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62103107A JPH062210B2 (en) | 1987-04-28 | 1987-04-28 | Ultra-precision virus removal filter and ultra-precision sterilization dust removal filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62103107A JPH062210B2 (en) | 1987-04-28 | 1987-04-28 | Ultra-precision virus removal filter and ultra-precision sterilization dust removal filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63270520A JPS63270520A (en) | 1988-11-08 |
| JPH062210B2 true JPH062210B2 (en) | 1994-01-12 |
Family
ID=14345395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62103107A Expired - Fee Related JPH062210B2 (en) | 1987-04-28 | 1987-04-28 | Ultra-precision virus removal filter and ultra-precision sterilization dust removal filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH062210B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07256061A (en) * | 1994-03-25 | 1995-10-09 | Nissho Corp | Liquid treatment device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54104082A (en) * | 1978-02-02 | 1979-08-15 | Mitsubishi Rayon Co Ltd | Gas filtration |
-
1987
- 1987-04-28 JP JP62103107A patent/JPH062210B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63270520A (en) | 1988-11-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3803810A (en) | Liquid-gas separator and filter | |
| JP3466878B2 (en) | Disposable membrane module with small dead volume | |
| CN100548450C (en) | Membrane contactor and manufacture method thereof | |
| JP3468568B2 (en) | Portable liquid purifier | |
| EP2500051B1 (en) | Intravenous filter | |
| JP2018527035A5 (en) | ||
| AU612421B2 (en) | Microporous filter and method | |
| JPH0365222A (en) | Tubular filter element | |
| EP0217335A2 (en) | Filter apparatus employing hollow fibers | |
| JPH062210B2 (en) | Ultra-precision virus removal filter and ultra-precision sterilization dust removal filter | |
| JP2011078900A (en) | Water purifying cartridge, and water purifier | |
| JPS621410A (en) | Precision filter device | |
| JP3381990B2 (en) | Hollow fiber membrane module | |
| JPS6397203A (en) | Cartridge for filtration | |
| US20130081992A1 (en) | Low pressure water filter cassette | |
| JP2504302Y2 (en) | Filter for water purifier-cartridge | |
| JPH07313972A (en) | Portable water purifier and usage of the same | |
| JP2570029Y2 (en) | Water purification cartridge | |
| JPS6031763Y2 (en) | precision filtration device | |
| JPH03254807A (en) | Membrane unit | |
| JPH057392U (en) | Water purifier | |
| JP4415484B2 (en) | Water purification cartridge | |
| JPH0613737Y2 (en) | Hemodialyzer | |
| JPH0576593U (en) | Liquid purification cartridge | |
| JPH055994Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |