US3271962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining process
Assignee: PPG Industries Inc
•
Filing: 1964-07-16
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Granted: 1966-09-13
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Expires: 1984-07-16
Abstract
No abstract record available.
Inventors
- 👤 Dahms James Bowen
- 👤 Byron P Edmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:40
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/10; E21D1/12; E21B; E21B43/00; E21B43/28; E21B43/281
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
A METHOD OF FREEZING A SELECTED ZONE EXTENDING THROUGH A SUBTERRANEAN WATER-BEARING STRATUM WHICH COMPRISES ESTABLISHING BENEATH A LEVEL WHERE WATER IS DISPOSED A SUBTERRANEAN PASSAGE WHICH INTERSECTS SAID ZONE, ESTABLISHING A CASED HOLE EXTENDING THROUGH SAID STRATUM AND OPENLY COMMUNICATING WITH SAID PASSAGE, ESTABLISHING A FURTHER CASED HOLE SUFFICIENTLY REMOVED FROM THE FIRSTNAMED CASED HOLE TO BE OUT OF SUBSTANTIAL HEAT TRANSFER RELATIONSHIP THEREWITH, SAID FURTHER CASED HOLE EXTENDING THROUGH SAID STRATUM AND OPENLY COMMUNICATING WITH SAID PASSAGE, FEEDING A LIQUID HAVING A TEMPERATURE BELOW 0*C. THROUGH THE FIRST-NAMED HOLE WITH FLOW THROUGH SAID STRATUM INTO THE PASSAGE AND WITHDRAWING SAID LIQUID FROM SAID PASSAGE THROUGH SAID FURTHER CASED HOLE UNTIL SAID SELECTED ZONE IS FROZEN.
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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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |