Patent US3402966A successfully refreshed from Google Patents.
US3402966A
Expired / Lapsed
US
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Forming solution mining surface at interface above cavern
Assignee: Kalium Chemicals Ltd
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Filing: 1967-06-09
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Granted: 1968-09-24
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Expires: 1987-06-09
Abstract
No abstract record available.
Inventors
- 👤 James B Dahms
- 👤 Byron P Edmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:31
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2038757A
Cited
US2822158A
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US2919909A
Cited
US3022986A
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US3139139A
Cited
US2976690A
Cited
US3086760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |