US2086778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing oxygen from air
Assignee: Individual
•
Filing: 1934-10-19
•
Granted: 1937-07-13
•
Expires: 1954-10-19
Abstract
No abstract record available.
Inventors
- 👤 Peffer Mary Caroline
- 👤 George H Shepard
- 👤 Jr George W Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:52
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0285; C01B2210/00; C01B2210/0043; C01B2210/0046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-07-12 | 1941-01-11 | 1941-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-07-12 | 1945-01-11 | 1945-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-07-12 | 1949-01-11 | 1949-07-13 | $7700.00 | Window Closed / Lapsed |