US2490986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing oxygen
Assignee: Standard Oil Co
•
Filing: 1945-04-18
•
Granted: 1949-12-13
•
Expires: 1965-04-18
Abstract
No abstract record available.
Inventors
- 👤 Fred L Symonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:03
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/08; C01B13/086; C01B13/083; Y; Y10; Y10S; Y10S48/00; Y10S48/04
Claims Analysis
Total Claims: 0
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US2147551A
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US2425754A
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US2304128A
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US2418402A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |