Patent US2991987A successfully refreshed from Google Patents.
US2991987A
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Processes for heating a mining liquid and mining therewith a substance modified by heat
Assignee: Submerged Combustion Inc
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Filing: 1956-12-31
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Granted: 1961-07-11
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Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 Robert V Heinze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:13
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/285
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |