US2521233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorption of nitrogen by liquid ammonia
Assignee: Phillips Petroleum Co
•
Filing: 1944-12-18
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Granted: 1950-09-05
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Expires: 1964-12-18
Abstract
No abstract record available.
Inventors
- 👤 Jr John W Latchum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:01
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11; C01; C01B; C01B21/00; C01B21/04; C01B21/0405; C01B21/0433; C01B21/0488; C01B2210/00; C01B2210/0043; C01B2210/0068; C01B2210/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
IN THE CONCENTRATION OF NITROGEN FROM GASEOUS MIXTURE THEREOF WITH HYDROCARBON GASES CONSISTING ESSENTIALLY OF METHANE, THE PROCESS COM-
Claim 2
Dependent Claim
19 words
IN THE CONCENTRATION OF NITROGEN FROM GASEOUS MIXTURE THEREOF WITH HYDROCARBON GASES CONSISTING ESSENTIALLY OF METHANE, THE PROCESS COM-
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) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |