US3577707A
Expired / Lapsed
US
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Sorption
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1969-12-19
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Granted: 1971-05-04
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Expires: 1989-12-19
Abstract
Abstract A process for sorbing nitrogen dioxide from a gaseous mixture with air, nitrous oxide or other gases by contact with a polyamide material such as polyhexamethylene adipamide in fibrous, powder or sintered form. The polyamide fibers may also be in bicomponent form wherein one component possesses potentially adhesive properties.
Inventors
- 👤 Trevor Raymond White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:45
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56; B01D53/02; B01J; B01J20/00; B01J20/22; C; C01; C01B; C01B21/00; C01B21/20; C01B21/36; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02C; Y02C20/00; Y02C20/10; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
18 words
A process according to claim 1 in which nitrogen dioxide contaminated gas is contacted with a polyamide material.
Claim 2
Dependent Claim
21 words
A process according to claim 2 in which a mixture of nitroGen dioxide with air is contacted with a polyamide material.
Claim 3
Dependent Claim
22 words
A process according to claim 2 in which a mixture of nitrogen dioxide with nitrous oxide is contacted with a polyamide material.
Claim 4
Dependent Claim
14 words
A process according to claim 1 in which the polyamide is in fibrous form.
Claim 5
Dependent Claim
20 words
A process according to claim 5 in which bicomponent polyamide fibers are employed where one component possesses potentially adhesive properties.
Claim 6
Dependent Claim
14 words
A process according to claim 1 in which the polyamide is in powder form.
Claim 7
Dependent Claim
19 words
A process according to claim 1 in which the polyamide is in the form of a sintered porous structure.
Claim 8
Dependent Claim
13 words
A process according to claim 1 in which the polyamide is polyhexamethylene adipamide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |