GB474823A - Improvements in and relating to filters for respiratory apparatus - Google Patents
Improvements in and relating to filters for respiratory apparatusInfo
- 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
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.
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)
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 |
-
1936
- 1936-02-03 GB GB3222/36A patent/GB474823A/en not_active Expired
Cited By (1)
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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