US2495840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil shale mining machine
Assignee: Individual
•
Filing: 1946-03-16
•
Granted: 1950-01-31
•
Expires: 1966-03-16
Abstract
No abstract record available.
Inventors
- 👤 John G Findlater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:10
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/10; E21C41/00; E21C41/16; E21C41/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US747869A
Cited
US1148973A
Cited
US981201A
Cited
GB191417786A
Cited
US1811560A
Cited
US1808649A
Cited
US2105505A
Cited
US2375689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-30 | 1953-08-01 | 1954-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-30 | 1957-08-01 | 1958-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-30 | 1961-08-01 | 1962-01-31 | $7700.00 | Window Closed / Lapsed |