Patent US2919909A successfully refreshed from Google Patents.
US2919909A
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Controlled caving for solution mining methods
Assignee: FMC Corp
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Filing: 1958-03-27
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Granted: 1960-01-05
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Expires: 1978-03-27
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Rule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:37
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/28; E21B43/283
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1960932A
Cited
US2847202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |