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WO1999006136A1 - Vetement pour salle blanche, a proprietes absorbantes - Google Patents

Vetement pour salle blanche, a proprietes absorbantes Download PDF

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Publication number
WO1999006136A1
WO1999006136A1 PCT/EP1998/001068 EP9801068W WO9906136A1 WO 1999006136 A1 WO1999006136 A1 WO 1999006136A1 EP 9801068 W EP9801068 W EP 9801068W WO 9906136 A1 WO9906136 A1 WO 9906136A1
Authority
WO
WIPO (PCT)
Prior art keywords
activated carbon
clean room
room suit
particle filter
filter layer
Prior art date
Application number
PCT/EP1998/001068
Other languages
German (de)
English (en)
Inventor
Ernest De Ruiter
Jonas T�RNBLOM
Original Assignee
Calgon Carbon Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Calgon Carbon Corporation filed Critical Calgon Carbon Corporation
Priority to EP98929256A priority Critical patent/EP1037698A1/fr
Priority to CA002301150A priority patent/CA2301150A1/fr
Priority to JP2000504941A priority patent/JP2001524609A/ja
Publication of WO1999006136A1 publication Critical patent/WO1999006136A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/14—Air permeable, i.e. capable of being penetrated by gases
    • A41D31/145—Air permeable, i.e. capable of being penetrated by gases using layered materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/262—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28023—Fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28078—Pore diameter
    • B01J20/2808—Pore diameter being less than 2 nm, i.e. micropores or nanopores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
    • B01J20/3206—Organic carriers, supports or substrates
    • B01J20/3208—Polymeric carriers, supports or substrates
    • B01J20/3212—Polymeric carriers, supports or substrates consisting of a polymer obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3234—Inorganic material layers
    • B01J20/324—Inorganic material layers containing free carbon, e.g. activated carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
    • B01J20/3244—Non-macromolecular compounds
    • B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
    • B01J20/3248—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3289—Coatings involving more than one layer of same or different nature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3291—Characterised by the shape of the carrier, the coating or the obtained coated product
    • B01J20/3297—Coatings in the shape of a sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/34—Regenerating or reactivating
    • B01J20/3425—Regenerating or reactivating of sorbents or filter aids comprising organic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/34—Regenerating or reactivating
    • B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
    • B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase

Definitions

  • gases such as ammonia, volatile organic acids and siloxanes - if only in the ppb range - increase the reject rate in addition to particles.
  • gases can be filtered out by special adsorption filters in the air supply, but this does not cover the human source of emissions:
  • the cleanroom suits used today only prevent the escape of particles, especially skin particles, but not that of gases.
  • Humans secrete gases through the skin (sweat), the digestive system and breathing, including harmful ammonia and organic acids.
  • Siloxanes which presumably come from skin and hair sprays, deodorants and certain cosmetics, also lead to incorrect batches during production in clean rooms.
  • a clean room suit which contains a breathable particle filter layer and an adsorption layer made of activated carbon on the side facing the wearer, serves to solve this task.
  • Clean room suits are known. They can be disposable or reusable. The former includes a dense spunbonded nonwoven made from very thin polyethylene fibers (Tyvek ® ). Reusable, ie washable clean room suits are usually woven or knitted fabrics made of synthetic fibers, such as polyesters, nylon, polypropylene, polyethylene, aramids and acrylic fibers. But also so-called nonwovens are made from very fine continuous fibers of these materials.
  • Clean room suits have in common that they hold back all particles and aerosols emitted by the body, that even the clean room suit must not release any particles or decomposition products, is abrasion and tear-resistant at low weight and has good wearing properties.
  • Well-known materials for the production of clean room suits are UCX, SCX, HEPA and ULPA cloth and the PURITA materials. Although particles with a size of 0.1 ⁇ m and more should be completely retained, sufficient breathability must be maintained.
  • Such polyester particle filter fabrics or knitted fabrics have a basis weight of 50 to 200 g / m 2 , in particular 100 to 10 g / m 2 .
  • Protective suits are known from the military sector which are intended to protect the wearer against skin toxins.
  • a surface filter that is particularly suitable for this purpose is described in German patent specification 33 04 3 9.
  • the said skin toxins are little volatile substances that are easy to adsorb. It was therefore not to be expected that a protective suit that protects the skin against chemical poisons and warfare agents would also prevent volatile substances emitted by the skin from escaping and enable gases such as ammonia to be adsorbed even in the ppb range.
  • the activated carbon adsorption layer can be attached to a very air-permeable textile fabric or else directly to the inside of the material of the clean room suit.
  • the activated carbon of the adsorbent layer can e.g. according to DE-C-33 04 349 from activated carbon grains, in particular fine-pored spherical carbon with diameters from 0.3 to 1 mm and an inner surface of over 500 m / g, with the aid of a discontinuously or punctiformly applied adhesive to a very air-permeable textile carrier be attached.
  • This can be laminated onto the inside of the particle filter layer and additionally covered with a light textile or worn as undergarment under the particle filter layer.
  • Such protective material is described in German utility model G 89 16 256.
  • the activated carbon grains can also be fixed directly to the inside of the particle filter using the method of DE-C-33 04 349 with the aid of a discontinuously applied adhesive.
  • activated carbon adsorption layer Another possibility known per se for forming the activated carbon adsorption layer is the so-called coal pressure known from DE-C-32 11 322, in which the air-permeable carrier layer is printed with a paste of fine activated carbon and a binder.
  • This is also a good option for clean room suits that are only used as disposable suits and consist, for example, of calendered thin polyolefin fleeces and which can then be printed on the inside with a large number of small piles of coal with a diameter of 0.2 to 0.8 mm.
  • the activated carbon layer on the inside of the clean room suit with the breathable particle filter layer can also consist of a thin, in particular reticulated foam, which is coated with a suspension of activated carbon powder and Binder was impregnated and in this way is coated with powdered coal.
  • Optimal is an adsorption layer made of an activated carbon fleece or activated carbon sheet, which is covered on both sides by a textile and which, compared to a granular activated carbon, has an enormous outer surface, in which the
  • the pore system consists for the most part of very narrow micropores with diameters below 2 nm, in particular below 1 nm. Since no high capacity is required, an inner BET surface area below 1200 m / g is sufficient, especially since the mechanical strength increases with increasing Activation declines.
  • a product which is particularly suitable for the purposes of the invention is Activated Charcoal Cloth (ACC) from Charcoal Cloth Ltd (see Filtration and Separation 1986, pp. 164-65).
  • ACC Activated Charcoal Cloth
  • the activated carbon layer in the various forms is very effective for most volatile products, but ammonia is not adsorbed very well.
  • the breathable particle filter layer of the clean room suit with a physiologically compatible, non-volatile organic
  • Impregnate acid The same can also be done with the activated carbon adsorption layer of the clean room suit.
  • High-boiling organic acids or those which are solid at room temperature and have a pk s value below 5, in particular below 4, which are physiologically harmless if they come into contact with the skin, are suitable for the reaction with the ammonia and optionally lower amines. These acids must be able to bind ammonia in the form of the corresponding ammonium salts. If the clean room suit as a whole or only the particle filter layer impregnated with the acids is washed for regeneration, these too
  • Suitable acids are citric acid, tartaric acid, malic acid, lactic acid,
  • Citric acid will preferred and this aspect of the invention is also explained below using the example of citric acid.
  • citric acid impregnation It has been found that activated carbon impregnated with citric acid is particularly suitable for the adsorption of ammonia and volatile amines. It can be assumed that adsorbed moisture plays an important role in this.
  • the advantages of citric acid impregnation are: easy wearing close to the skin, no damage to textiles and the possibility of re-impregnation in the rinse cycle after washing.
  • a 0.5 to 20, in particular 1 to 10,% by weight citric acid solution is expediently used. The same applies to the other organic acids mentioned.
  • citric acid adhering to the outer particle filter layer comes off in the form of the finest crystals and contaminates the pure air. Otherwise, only the adsorption layer should be impregnated, which in turn would require a two-piece clean room suit with separation of the particle and adsorption filter layers.
  • a citric acid impregnation of the particle filter layer is sufficient to virtually completely prevent the emission of ammonia and amines from the skin. This finding allows the construction of a two-piece clean room suit, on the one hand from a polyester suit impregnated with citric acid to avoid particle emissions and on the other hand underneath the (non-impregnated) adsorption layer, which binds the other volatile body emissions. Since impregnation of the activated carbon generally worsens the adsorptive properties, this alternative is to be assessed positively.
  • the separation into a particle and ammonia filter layer and an adsorption filter layer makes sense.
  • a polyester-based fabric suitable for cleanroom suits (basis weight approx. 100 g / m) was coated in accordance with DE-C-33 04 349 with an adhesive based on Impranil HS 62 and Imprafix HSC, both products from Bayer AG, using a 25 mesh Stencil printed in dot form (approx. 25 g / m overlay, approx. 30% coverage).
  • the sticky piles were sprinkled with a fine-pored, very abrasion-resistant spherical coal on a pitch basis, with an inner surface of approx. 1,200 m 2 / g and a diameter of 0.3 - 0.5 mm, and then hardened.
  • the amount of spherical carbon was 170 g / m 2 .
  • the spherical carbon is described, inter alia, in US-A-1 468 982.
  • a spherical carbon was used, which was produced in accordance with DE 43 28 219 AI and had a micropore diameter of 0.5 Nm.
  • the inner surface should be at least 500 m / g, preferably at least 900 m / g, while ball diameters from 0.3 to 1.0 mm are useful.
  • Clean room suits were made from the material loaded with activated carbon and compared in practice with normal clean room suits made from the same fabric, but not loaded with activated carbon. While the latter found an emission of basic (NH 3 ) and acidic volatile substances produced by the wearer in the ppb range, these substances were missing when the suit according to the invention was worn. The duration of the test was 4 weeks with a total of 4 washes with the addition of lauryl sulfonate.
  • the suit according to the invention was then impregnated with a 1% citric acid solution. With this suit, there was no NH 3 emission at all can be determined more. The suit was washed, re-impregnated with 1% citric acid and dried. Even now, no measurable emission of any kind could be determined.
  • a wearable NH 3 emission was found in the wearing test, which was completely suppressed after citric acid impregnation, as described in the previous example.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Textile Engineering (AREA)
  • Nanotechnology (AREA)
  • Materials Engineering (AREA)
  • Filtering Materials (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)

Abstract

Afin de cr�er un v�tement pour salle blanche, qui n'absorbe pas uniquement les particules, mais �galement les gaz �mis par des �tres humains, et qui affectent la production dans des salles � atmosph�re extra-pure, outre la couche de filtration de particules perm�able � l'air, il est pr�vu sur le c�t� faisant face au support, une couche d'adsorption en charbon actif. Cette derni�re consiste notamment en un produit en nappe en fibres de charbon actif. Afin de pouvoir �galement �liminer l'ammoniac en totalit�, la couche de filtration de particules est impr�gn�e de pr�f�rence d'un acide organique non volatile pr�sentant une bonne tol�rance sur le plan physiologique, par ex. de l'acide citrique.
PCT/EP1998/001068 1997-07-31 1998-02-25 Vetement pour salle blanche, a proprietes absorbantes WO1999006136A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP98929256A EP1037698A1 (fr) 1997-07-31 1998-02-25 Vetement pour salle blanche, a proprietes absorbantes
CA002301150A CA2301150A1 (fr) 1997-07-31 1998-02-25 Vetement pour salle blanche, a proprietes absorbantes
JP2000504941A JP2001524609A (ja) 1997-07-31 1998-02-25 吸着性を持つクリーンルーム衣服

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19732927.6 1997-07-31
DE19732927A DE19732927A1 (de) 1997-07-31 1997-07-31 Reinraumanzug mit adsorbierenden Eigenschaften

Publications (1)

Publication Number Publication Date
WO1999006136A1 true WO1999006136A1 (fr) 1999-02-11

Family

ID=7837434

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/001068 WO1999006136A1 (fr) 1997-07-31 1998-02-25 Vetement pour salle blanche, a proprietes absorbantes

Country Status (5)

Country Link
EP (1) EP1037698A1 (fr)
JP (1) JP2001524609A (fr)
CA (1) CA2301150A1 (fr)
DE (1) DE19732927A1 (fr)
WO (1) WO1999006136A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018102464B3 (de) 2018-02-05 2019-06-06 Harting Electric Gmbh & Co. Kg Kabelzugentlastung und Schirmbefestigung bei einem Steckverbindergehäuse

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10102096B4 (de) * 2001-01-18 2007-08-09 BLüCHER GMBH Geruchsadsorbierende Berufsbekleidung
US10478517B2 (en) 2008-09-19 2019-11-19 Fipak Research And Development Company Method and apparatus for purging unwanted substances from air
WO2013134765A1 (fr) * 2012-03-09 2013-09-12 Fipak Research And Development Company Procédé et appareil d'élimination de substances indésirables présentes dans l'air
US20170367420A1 (en) * 2016-06-24 2017-12-28 Micronshield Llc System and garment for minimizing clean environment contamination

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856509A (en) * 1985-07-08 1989-08-15 Lemelson Jerome H Face mask and method
DE3924034A1 (de) * 1989-07-21 1991-01-24 Ruiter Ernest De Schutzmaterial
JPH0571002A (ja) * 1991-09-04 1993-03-23 Fujitsu Ltd 清浄雰囲気用衣類

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4310110A1 (de) * 1992-07-07 1994-01-13 Kaercher Gmbh & Co Alfred Mehrlagiges, textiles, gasdurchlässiges Filtermaterial gegen chemische Schadstoffe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856509A (en) * 1985-07-08 1989-08-15 Lemelson Jerome H Face mask and method
DE3924034A1 (de) * 1989-07-21 1991-01-24 Ruiter Ernest De Schutzmaterial
JPH0571002A (ja) * 1991-09-04 1993-03-23 Fujitsu Ltd 清浄雰囲気用衣類

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 394 (C - 1088) 23 July 1993 (1993-07-23) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018102464B3 (de) 2018-02-05 2019-06-06 Harting Electric Gmbh & Co. Kg Kabelzugentlastung und Schirmbefestigung bei einem Steckverbindergehäuse
US10530093B2 (en) 2018-02-05 2020-01-07 Harting Electric Gmbh & Co. Kg Cable strain relief and shield fastening in a plug connector housing

Also Published As

Publication number Publication date
EP1037698A1 (fr) 2000-09-27
CA2301150A1 (fr) 1999-02-11
DE19732927A1 (de) 1999-02-04
JP2001524609A (ja) 2001-12-04

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