US3131914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burning process for recovering sulfur from the earth
Assignee: Individual
•
Filing: 1961-04-13
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Granted: 1964-05-05
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Expires: 1981-04-13
Abstract
No abstract record available.
Inventors
- 👤 Wendell S Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:04
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/02; E21B43/00; E21B43/285
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE PROCESS OF RECOVERING SULFUR FROM THE EARTH COMPRISING BURNING SOME OF SAID SULFUR IN SITU BENEATH THE SURFACE OF THE EARTH AND AT A TEMPERATURE WELL ABOVE THE CRITICAL TEMPERATURE OF 320*F. AT WHICH THE SULFUR INCREASES IN VISCOSITY, MELTING ADDITIONAL PORTIONS OF SAID SULFUR BY THE HEAT OF SAID BURNING TO A TEMPERATURE ABOVE SAID 320*F. CRITICAL TEMPERATURE WITH THE RESULT THAT SAID ADDITIONAL PORTIONS AFTER MELTING BECOME HIGHLY VISCOUS, INTERRUPTING SAID BURNING FOR AN INTERVAL SUFFICIENT TO ALLOW SOME OF THE VISCOUS MELTED SULFUR ABOVE SAID CRITICAL TEMPERATURE TO COOL TO A TEMPERATURE LESS THAN 320* F. BUT WITH THE SULFUR STILL IN MELTED FORM AND THEREFORE AT A VISCOSITY LOWER THAN BEFORE SAID COOLING, RECOVERING SAID SULFUR WHICH HAS DECREASED IN TEMPERATURE WHILE IT
Claim 2
Dependent Claim
128 words
THE PROCESS OF RECOVERING SULFUR FROM THE EARTH COMPRISING BURNING SOME OF SAID SULFUR IN SITU BENEATH THE SURFACE OF THE EARTH AND AT A TEMPERATURE WELL ABOVE THE CRITICAL TEMPERATURE OF 320*F. AT WHICH THE SULFUR INCREASES IN VISCOSITY, MELTING ADDITIONAL PORTIONS OF SAID SULFUR BY THE HEAT OF SAID BURNING TO A TEMPERATURE ABOVE SAID 320*F. CRITICAL TEMPERATURE WITH THE RESULT THAT SAID ADDITIONAL PORTIONS AFTER MELTING BECOME HIGHLY VISCOUS, INTERRUPTING SAID BURNING FOR AN INTERVAL SUFFICIENT TO ALLOW SOME OF THE VISCOUS MELTED SULFUR ABOVE SAID CRITICAL TEMPERATURE TO COOL TO A TEMPERATURE LESS THAN 320* F. BUT WITH THE SULFUR STILL IN MELTED FORM AND THEREFORE AT A VISCOSITY LOWER THAN BEFORE SAID COOLING, RECOVERING SAID SULFUR WHICH HAS DECREASED IN TEMPERATURE WHILE IT
References Cited (Backward Citations)
US531787A
Cited
US1259537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |