US50903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved mode of operating oil-wells
Assignee: —
•
Filing: —
•
Granted: 1865-11-14
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Expires: 1882-11-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:43
CPC Classifications
E; E21; E21C; E21C41/00; E21C41/16; E21C41/24
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) | 1868-11-13 | 1869-05-15 | 1869-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1872-11-13 | 1873-05-15 | 1873-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1876-11-13 | 1877-05-15 | 1877-11-14 | $7700.00 | Window Closed / Lapsed |