US2979157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing gas-proof and gas-adsorbent materials and the articles so produced
Assignee: Akzo Nobel UK PLC
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Filing: 1942-10-23
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Granted: 1961-04-11
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Expires: 1962-10-23
Abstract
No abstract record available.
Inventors
- 👤 Clark James Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:22
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28028; B01J20/28033
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A MATERIAL PERMEABLE TO AIR BUT IMPREMEABLE TO HEAVY GASES COMPRISING A FIBROUS SUPPORT COMBINED WITH AN ALKALI-SOLUBLE WATER-INSOLUBLE CELLULOSIC COLLOID CARRYING A SOLID MATERIAL WHICH IS AN ABSORBENT OF SAID HEAVY GASES.
Claim 2
Dependent Claim
33 words
A MATERIAL PERMEABLE TO AIR BUT IMPREMEABLE TO HEAVY GASES COMPRISING A FIBROUS SUPPORT COMBINED WITH AN ALKALI-SOLUBLE WATER-INSOLUBLE CELLULOSIC COLLOID CARRYING A SOLID MATERIAL WHICH IS AN ABSORBENT OF SAID HEAVY GASES.
References Cited (Backward Citations)
US2286964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |