US1263618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of oil from oil-sands.
Assignee: WALTER SQUIRES
•
Filing: 1918-01-26
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Granted: 1918-04-23
•
Expires: 1938-01-26
Abstract
No abstract record available.
Inventors
- 👤 Frederick Squires
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:52
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/34; E21B43/40; E21B43/35
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) | 1921-04-22 | 1921-10-22 | 1922-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-04-22 | 1925-10-22 | 1926-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-04-22 | 1929-10-22 | 1930-04-23 | $7700.00 | Window Closed / Lapsed |