Patent US2490587A successfully refreshed from Google Patents.
US2490587A
Expired / Lapsed
US
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Manufacture of oxygen
Assignee: ExxonMobil Oil Corp
•
Filing: 1944-08-07
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Granted: 1949-12-06
•
Expires: 1964-08-07
Abstract
No abstract record available.
Inventors
- 👤 Celeste M Fontana
- 👤 Gorin Everett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:48
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/0203
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US73540A
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US1124304A
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US945048A
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US1091023A
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US1984380A
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US2206399A
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US2204733A
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US2304827A
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US2299427A
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US2418930A
Cited
US2418402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |