Patent EP0194657A1 successfully refreshed from Google Patents.
EP0194657A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Protective hood with CO2 absorbent
Assignee: EIDP Inc
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Filing: 1986-03-12
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Granted: —
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Expires: 2006-03-12
Abstract
Abstract A hood for providing breathable air having CO 2 absorption means (8) within the hood.
Inventors
- 👤 Bertil Werjefelt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:08
CPC Classifications
A; A62; A62B; A62B19/00; A62B17/00; A62B17/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
171 words
A hood for providing the user of the hood with breathable air, the hood comprising: (a) a generally tubular portion having open upper and lower ends and a continuous sidewall having inner and outer side surfaces, the generally tubular portion being comprised of a substantially gas-impermeable film: (b) a generally circular hood portion comprised of the gas-impermeable film, the circular hood portion being connected to the upper end of the tubular portion; (c) a substantially annular, resilient neck seal attached to the inner side portion of the lower end of the tubular portion, the neck seal having an opening for permitting at least the head of the user into the hood to form a closure around the user: and (d) C0 2 absorption means disposed on the interior of the hood, the CO 2 absorption means being retained in semi-permeable membrane, the membrane having a porosity sufficient to retain the CO 2 absorption means out of contact with the user and allow C0 2 and moisture to pass through the membrane.
Claim 2
Dependent Claim
171 words
A hood for providing the user of the hood with breathable air, the hood comprising: (a) a generally tubular portion having open upper and lower ends and a continuous sidewall having inner and outer side surfaces, the generally tubular portion being comprised of a substantially gas-impermeable film: (b) a generally circular hood portion comprised of the gas-impermeable film, the circular hood portion being connected to the upper end of the tubular portion; (c) a substantially annular, resilient neck seal attached to the inner side portion of the lower end of the tubular portion, the neck seal having an opening for permitting at least the head of the user into the hood to form a closure around the user: and (d) C0 2 absorption means disposed on the interior of the hood, the CO 2 absorption means being retained in semi-permeable membrane, the membrane having a porosity sufficient to retain the CO 2 absorption means out of contact with the user and allow C0 2 and moisture to pass through the membrane.
Claim 3
Dependent Claim
15 words
A hood of Claim 1 wherein the CO 2 absorption means is in particulate form.
Claim 4
Dependent Claim
22 words
A hood of Claim 1 wherein the semi-permeable membrane has a number average pore size of about from 10 to 100 microns.
Claim 5
Dependent Claim
25 words
A hood of Claim 1 further comprising an in-flow valve attached to the hood and adapted to be connected to a source of breathable oxygen.
Claim 6
Dependent Claim
27 words
A hood of Claim 4 further comprising an outflow valve to permit release of gas inside the hood when the pressure inside the hood exceeds atmospheric pressure.
Claim 7
Dependent Claim
23 words
A hood of Claim 2 wherein the C0 2 absorption means is selected from sodium hydroxide, sodium carbonate and alkaline earth metal hydroxides.
Claim 8
Dependent Claim
17 words
A hood of Claim 6 comprising about from 50 to 500 grams of C0 2 absorption means.
Claim 9
Dependent Claim
16 words
A hood of Claim 6 wherein the C0 2 absorption means consists essentially of lithium hydroxide.
Claim 10
Dependent Claim
13 words
A hood of Claim 1 wherein the semi-permeable membrane is a spunbonded fabric.
Claim 11
Dependent Claim
13 words
A hood of Claim 1 wherein the semi-permeable membrane is a woven fabric.
Claim 12
Dependent Claim
15 words
A hood of Claim 1 wherein the semi-permeable membrane is an expanded fluoropolymer laminated fabric.
Claim 13
Dependent Claim
26 words
A hood of Claim 1 wherein the C0 2 absorption means is encased in packets of semi-permeable membrane bonded to the interior surface of the hood.
Claim 14
Dependent Claim
29 words
A hood of Claim 1 having about from 75 to 150 grams of C0 2 absorption means and wherein the CO 2 absorption means consists essentially of lithium hydroxide.
Claim 15
Dependent Claim
21 words
A hood of Claim 1 further comprising a gas sensor to alert the user to nitrogen gas buildup within the hood.
References Cited (Backward Citations)
GB145678A
Cited
FR793550A
Cited
US2744524A
Cited
FR1491110A
Cited
US3521629A
Cited
FR2220133A5
Cited
US4039620A
Cited
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