Patent US1237139A successfully refreshed from Google Patents.
US1237139A
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US
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Method of and apparatus for extracting oil from subterranean strata
Assignee: —
•
Filing: —
•
Granted: 1917-08-14
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Expires: 1934-08-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:42
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/006
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) | 1920-08-13 | 1921-02-12 | 1921-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-08-13 | 1925-02-12 | 1925-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-08-13 | 1929-02-12 | 1929-08-14 | $7700.00 | Window Closed / Lapsed |