Patent US3097830A successfully refreshed from Google Patents.
US3097830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining methods and systems including caving to relieve pressure
Assignee: FMC Corp
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Filing: 1960-10-03
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Granted: 1963-07-16
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Expires: 1980-10-03
Abstract
No abstract record available.
Inventors
- 👤 Robert F Love
- 👤 Thomas S Bernatis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:11
CPC Classifications
E; E21; E21C; E21C41/00; E21C41/16; E21C41/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
THE METHOD OF MINING TRONA AND RELIEVING OVERBURDEN PRESSURE IN THE MINING OPERATION WHICH COMPRISES DRIVING TWO ADJACENT ROOMS INTO THE TRONA BED BETWEEN THE ACTIVE MINING AREA AND THE UNMINED TRONA AREA, THE SAID ROOMS BEING CLOSE ENOUGH SO THAT UPON CAVING THE ROOM ADJACENT THE UNMINED TRONA AREA THE OVERBURDEN PRESSURE WILL BE REDUCED TO AVOID UNPLANNED, PREMATURE CAVING IN THE ACTIVE MINING AREA, CAVING THE ROOM ADJACENT THE UNMINED TRONA AREA AND, MINING THE PILLARS IN THE ACTIVE MINING AREA FROM THE UNCAVED ROOM.
References Cited (Backward Citations)
US1004418A
Cited
US2846205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-15 | 1967-01-14 | 1967-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-15 | 1971-01-14 | 1971-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-15 | 1975-01-14 | 1975-07-16 | $7700.00 | Window Closed / Lapsed |