Patent US2675994A successfully refreshed from Google Patents.
US2675994A
Expired / Lapsed
US
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Thermal mineral piercing method and apparatus
Assignee: Union Carbide Corp
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Filing: 1948-03-25
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Granted: 1954-04-20
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Expires: 1968-03-25
Abstract
No abstract record available.
Inventors
- 👤 George H Smith
- 👤 Beverly M Higginbotham
- 👤 William J Mitchell
- 👤 Joseph J Calaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:55
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
IN A METHOD OF THERMALLY PIERCING A HOLE IN A MASS OF ROCK BY APPLYING THERETO FLAME FROM A HEATING DEVICE, SEPARATING MATERIAL FROM SAID MASS BY SAID FLAME, REMOVING THE SEPARATED MATERIAL FROM SAID MASS TO FORM A HOLE, AND ADVANCING SAID HEATING DEVICE INTO SUCCESSIVE PORTIONS OF SAID HOLE AS FORMED TO INCREASE THE DEPTH THEREOF, THE IMPROVEMENT COMPRISING: DIRECTING SAID FLAME FROM SAID HEATING DEVICE AS A PLURALITY OF FLAME JETS, AT LEAST ONE OF SAID FLAME JETS BEING DIRECTED ECCENTRICALLY WITH RESPECT TO THE LONGITUDINAL AXIS OF SAID HEATING DEVICE, AND ROTATING SAID FLAME JETS ABOUT THE LONGITUDINAL
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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) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |