Patent US4046939A successfully refreshed from Google Patents.
US4046939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas resistant foam materials
Assignee: Her Majesty the Queen in Right of Canada
•
Filing: 1976-01-07
•
Granted: 1977-09-06
•
Expires: 1996-01-07
Abstract
Abstract An air and water vapor permeable open cell solid resin foam resistant to passage therethrough of noxious chemicals in liquid or vapor form said foam having dispersed therein a particulate adsorbent material for said noxious chemicals said particulate adsorbent material being bonded in said foam by an organic binder which is substantially free from substances which substantially deactivate the adsorbent.
Inventors
- 👤 John A. H. Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:55
CPC Classifications
A; A62; A62D; A62D5/00; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/245; B32B5/18; C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; B32B2260/00; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2266/06; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/726; C08J2375/00; C08J2375/04; C08J2433/00; Y; Y10; Y10S; Y10S2/00; Y10S2/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/30; Y10T428/31504; Y10T428/31551; Y10T428/31591
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
An air and water permeable open cell solid flexible polyurethane foam resistant to the passage therethrough of noxious chemicals in liquid or vapor form, said foam having dispersed therein particulate activated carbon of average particle size in the range 7 to 10 microns and in an amount of at least 10% by weight of said foam and not in excess of 12 milligrams per sq. cm. of foam, said activated carbon particles being bonded in said foam by an acrylic elastomeric binder which is substantially free from substances which would substantially deactivate the activated carbon particles, said binder being present in an amount from 15 to 100 parts by weight per 100 parts by weight of said carbon.
Claim 2
Dependent Claim
118 words
An air and water permeable open cell solid flexible polyurethane foam resistant to the passage therethrough of noxious chemicals in liquid or vapor form, said foam having dispersed therein particulate activated carbon of average particle size in the range 7 to 10 microns and in an amount of at least 10% by weight of said foam and not in excess of 12 milligrams per sq. cm. of foam, said activated carbon particles being bonded in said foam by an acrylic elastomeric binder which is substantially free from substances which would substantially deactivate the activated carbon particles, said binder being present in an amount from 15 to 100 parts by weight per 100 parts by weight of said carbon.
Claim 3
Dependent Claim
13 words
A foam as claimed in claim 1, which is an elastically resilient foam.
Claim 4
Dependent Claim
16 words
A foam as claimed in claim 1, which is a polyurethane foam of the polyester type.
Claim 5
Dependent Claim
18 words
A foam as claimed in claim 1, which is a foam of a styrene vinyl or cellulose resin.
Claim 6
Dependent Claim
17 words
A foam as claimed in claim 1 in which the activated carbon comprises at least 5 milligrams/sq.cm.
Claim 7
Dependent Claim
16 words
A foam as claimed in claim 1, in which the binder is a water insoluble resin.
Claim 8
Dependent Claim
17 words
A foam as claimed in claim 1, in which the binder is a self curing acrylic polymer.
Claim 9
Dependent Claim
44 words
A process for the production of a foam as claimed in claim 1 which comprises impregnating said foam with a suspension or dispersion of said carbon particles containing said binder; removing excess liquid from said foam and drying said foam to cure said binder.
Claim 10
Dependent Claim
22 words
A method of removing noxious gases from the atmosphere which comprises causing the atmosphere to pass through the foam of claim 1.
References Cited (Backward Citations)
GB575379A
Cited
US3238056A
Cited
US3586596A
Cited
US3463690A
Cited
US3632533A
Cited
US3647607A
Cited
US3748217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |