Patent US2738162A successfully refreshed from Google Patents.
US2738162A
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Method and apparatus for forming blasting holes in rock
Assignee: Union Carbide Corp
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Filing: 1953-02-27
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Granted: 1956-03-13
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Expires: 1973-02-27
Abstract
No abstract record available.
Inventors
- 👤 Robert B Aitchison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:18
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/14; E21B7/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
THE METHOD FOR INCREASING THE DIAMETER OF A BORE IN A BODY OF ROCK WHICH COMPRISES DIRECTING FROM AN INTERNAL COMBUSTION BURNER AGAINST A PERIPHERAL ZONE OF THE SIDE WALL OF SAID BORE A JET OF BURINING GASES HAVING A LINEAR VELOCITY GREATER THAN SONIC VELOCITY, THE AXIS OF SAID JET FORMING, IN THE REGION BETWEEN SAID JET AND THE OPEN END OF SAID BORE, AND AN ANGLE OF LESS THAN 90 DEGREES WITH THE LONGITUDINAL AXIS OF SAID BORE; TRAVERSING SAID JET AXIALLY OF SAID BORE TO REMOVE MATERIAL FROM SUCCESSIVE PERIPHERAL ZONES OF SAID SIDE WALL; AND EJECTING SAID MATERIAL FROM SAID BORE AT LEAST IN PART BY THE ACTION OF SAID JET.
Claim 2
Independent Claim
115 words
THE METHOD FOR INCREASING THE DIAMETER OF A BORE IN A BODY OF ROCK WHICH COMPRISES DIRECTING FROM AN INTERNAL COMBUSTION BURNER AGAINST A PERIPHERAL ZONE OF THE SIDE WALL OF SAID BORE A JET OF BURINING GASES HAVING A LINEAR VELOCITY GREATER THAN SONIC VELOCITY, THE AXIS OF SAID JET FORMING, IN THE REGION BETWEEN SAID JET AND THE OPEN END OF SAID BORE, AND AN ANGLE OF LESS THAN 90 DEGREES WITH THE LONGITUDINAL AXIS OF SAID BORE; TRAVERSING SAID JET AXIALLY OF SAID BORE TO REMOVE MATERIAL FROM SUCCESSIVE PERIPHERAL ZONES OF SAID SIDE WALL; AND EJECTING SAID MATERIAL FROM SAID BORE AT LEAST IN PART BY THE ACTION OF SAID JET.
References Cited (Backward Citations)
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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) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |