EP0159698A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Gas mask canister
Assignee: Pall Corp
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Filing: 1985-04-23
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Granted: —
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Expires: 2005-04-23
Abstract
Abstract A filter canister for removing undesirable substances from a breathable gas comprises a cylindrical housing having a gas inlet, a gas outlet and a gas flow path between them. The filter canister also comprises first and second cylindrical filter assemblies disposed in the housing in the gas flow path with the first filter assembly disposed upstream from the second filter assembly. The first filter assembly has an annular cross section and includes a porous means for removing particles from the gas. The second filter assembly is disposed coaxially to the first filter assembly and includes a sorbent-containing means for removing vaporous chemical contaminants from the gas. The filter canister further comprises a structure for directing the gas flow radially through the first filter assembly and axially through the second filter assembly.
Inventors
- 👤 John David Miller
- 👤 Clayton Lewis Reed
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 03:08
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0084; B01D46/0091; A; A62; A62B; A62B19/00; A62B23/00; A62B23/02; B01D46/0027; B01D46/0036; B01D46/24; B01D46/2403; B01D46/2411; B01D46/52; B01D46/521; B01D46/56; B01D46/62; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0431; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/20; B01D2253/202; B01D2253/30; B01D2253/302; B01D2253/304; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40084; B01D2259/45; B01D2259/4541
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
122 words
A filter canister for removing undesirable substances from a breathable gas, said filter canister comprising a cylindrical housing having a gas inlet, a gas outlet and a gas flow path therebetween; first and second cylindrical filter assemblies disposed within the housing in the gas flow path with the first filter assembly disposed upstream from the second filter assembly; said first filter assembly having an annular cross-section and including a porous means for removing particles from the gas; said second filter assembly disposed coaxially to the first filter assembly and including a sorbent containing means for removing vaporous chemical contaminants from the gas; and means for directing the gas flow radially through the first filter assembly and axially through the second filter assembly.
Claim 2
Dependent Claim
122 words
A filter canister for removing undesirable substances from a breathable gas, said filter canister comprising a cylindrical housing having a gas inlet, a gas outlet and a gas flow path therebetween; first and second cylindrical filter assemblies disposed within the housing in the gas flow path with the first filter assembly disposed upstream from the second filter assembly; said first filter assembly having an annular cross-section and including a porous means for removing particles from the gas; said second filter assembly disposed coaxially to the first filter assembly and including a sorbent containing means for removing vaporous chemical contaminants from the gas; and means for directing the gas flow radially through the first filter assembly and axially through the second filter assembly.
Claim 3
Dependent Claim
45 words
The filter canister according to claim 1, wherein the second filter assembly has a generally circular cross-section and is disposed within the annular first filter assembly; and wherein the directing means includes means for guiding the gas flow radially inwardly through the first filter assembly.
Claim 4
Dependent Claim
18 words
The filter canister according to claim 1 or 2, wherein the porous means includes a pleated microfibrous filter.
Claim 5
Dependent Claim
18 words
The filter canister according to claim 1 or 2, wherein the porous means includes a microporous polymeric membrane.
Claim 6
Dependent Claim
29 words
The filter canister according to anyone of the claims 1 to 4, wherein the porous means comprises a filter medium having non-fouling properties for both liquid water and oil.
Claim 7
Dependent Claim
24 words
The filter canister according to anyone of the claims 1 to 5, wherein the porous means comprises a filter medium including microfibrous glass fibers.
Claim 8
Dependent Claim
25 words
The filter canister according to anyone of the claims 1 to 6, wherein the filter medium further comprises an integral means for supporting the filter.
Claim 9
Dependent Claim
47 words
The filter canister according to anyone of the claims 1 to 7, wherein the second filter assembly further includes a sorbent dust filter means for removing sorbent particles as small as one micrometer from the gas, said sorbent dust filter means disposed downstream from the sorbent-containing means.
Claim 10
Dependent Claim
25 words
The filter canister according to anyone of the claims 1 to 8, wherein the sorbent containing means includes a bed of compressively-loaded loose sorbent particles.
Claim 11
Dependent Claim
23 words
The filter canister according to anyone of the claims 1 to 8, wherein the sorbent-containing means includes a bed of immobilized sorbent particles.
Claim 12
Dependent Claim
24 words
The filter canister according to claim 10, wherein the bed of immobilized sorbent particles comprises a mixture of polymeric binding material and sorbent particles.
Claim 13
Dependent Claim
22 words
The filter canister according to claim 11, wherein the sorbent particles comprise carbon particles and the polymeric binding material comprises powdered polyethylene.
Claim 14
Dependent Claim
21 words
The filter canister according to claim 10, wherein the bed of immobilized sorbent particles comprises a bed of fiber-immobilized sorbent particles.
Claim 15
Dependent Claim
48 words
The filter canister according to anyone of the claims 1 to 13, wherein the housing includes a first portion; and wherein the filter canister further comprises aperture means in the first portion for preventing the collection of liquids upstream from the first filter assembly regardless of canister orientation
Claim 16
Dependent Claim
39 words
The filter canister according to anyone of the claims 1 to 14, wherein the second filter assembly is removably mounted to the housing; and wherein the housing includes a detachable means for allowing access to the second filter assembly.
References Cited (Backward Citations)
No citation records indexed.
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