Patent US2500291A successfully refreshed from Google Patents.
US2500291A
Expired / Lapsed
US
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Process of recovering ammonia
Assignee: Carnegie Illinois Steel Corp
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Filing: 1947-03-28
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Granted: 1950-03-14
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Expires: 1967-03-28
Abstract
No abstract record available.
Inventors
- 👤 Charles R Liebel
- 👤 Joseph H Wells
- 👤 Jr Philip J Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:08
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
58 words
A PROCESS FOR SELECTIVELY ABSORBING AMMONIA FROM GASES CONTAINING THE SAME, WHICH COMPRISES PASSING THE AMMONIA-CONTAINING GAS THROUGH AN ABSORBENT LIQUID COMPOSED OF AN AQUEOUS SOLUTION OF A MINERAL ACID SALT OF AN AROMATIC BASE, THE BASE BEING SUBSTANTIALLY INSOLUBLE IN WATER, THE ABSORBENT LIQUID HAVING AN INITIAL PH VALUE OF BETWEEN APPROXIMATELY PH 7.5 AND PH 9.
References Cited (Backward Citations)
US2410906A
Cited
US2435663A
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US1631720A
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US1983375A
Cited
US1936864A
Cited
US2106734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |