GB474823A - Improvements in and relating to filters for respiratory apparatus - Google Patents

Improvements in and relating to filters for respiratory apparatus

Info

Publication number
GB474823A
GB474823A GB3222/36A GB322236A GB474823A GB 474823 A GB474823 A GB 474823A GB 3222/36 A GB3222/36 A GB 3222/36A GB 322236 A GB322236 A GB 322236A GB 474823 A GB474823 A GB 474823A
Authority
GB
United Kingdom
Prior art keywords
filter
layers
filter material
filters
feb
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
Application number
GB3222/36A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VACLAV KAREL DOLEZAL
Original Assignee
VACLAV KAREL DOLEZAL
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 VACLAV KAREL DOLEZAL filed Critical VACLAV KAREL DOLEZAL
Publication of GB474823A publication Critical patent/GB474823A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00—Filters for breathing-protection purposes
    • A62B23/02—Filters for breathing-protection purposes for respirators

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

474,823. Respiratory filters. DOLEZAL, V. K. Feb. 3, 1936, No. 3222. Void. Convention date, Feb. 2, 1935. [Class 81 (ii)] A filter plate, constituting a respiratory filter or a unit of such filter, is composed of two or more layers of filter material superposed in spaced relationship, the spacing being preferably very small. As shown, in a bellowslike filter wherein the air passes into the bellows at 1 and out through the walls thereof, the filter units each comprise two layers, such as a, b, of mechanical filter material and the end unit comprises three such layers c, d, e, in order to render its resistance equal to that of the others. The lowest unit is clamped to the casing about its central aperture as shown. In another construction, one or more layers of chemical filter material are enclosed between the layers a and b, and d and e, and the lowest layer, one which is attached to a superimposed layer at its centre, is clamped to the casing about its periphery.
GB3222/36A 1935-02-02 1936-02-03 Improvements in and relating to filters for respiratory apparatus Expired GB474823A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS474823X 1935-02-02

Publications (1)

Publication Number Publication Date
GB474823A true GB474823A (en) 1937-11-08

Family

ID=5453002

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3222/36A Expired GB474823A (en) 1935-02-02 1936-02-03 Improvements in and relating to filters for respiratory apparatus

Country Status (1)

Country Link
GB (1) GB474823A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142549A (en) * 1961-10-31 1964-07-28 Electric Storage Battery Co Respirator and a disposable pre-filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142549A (en) * 1961-10-31 1964-07-28 Electric Storage Battery Co Respirator and a disposable pre-filter

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