US3211242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of flame working materials
Assignee: H E FLETCHER CO
•
Filing: 1963-07-23
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Granted: 1965-10-12
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Expires: 1983-07-23
Abstract
No abstract record available.
Inventors
- 👤 James A Browning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:40
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
IN A METHOD OF FLAME WORKING A HEAT SPALLABLE MINERAL BODY, THE STEPS WHICH INCLUDE INTRODUCING INTO ONE END OF A CONFINED CHAMBER A MIXTURE OF FUEL, OXYGEN AND AN INERT GAS, BURNING THE MIXTURE OF FUEL AND OXIDANT IN THE CONFINED CHAMBER AT SUPERATMOSPHERIC PRESSURE TO FORM A HIGH VELOCITY FLOW OF PRODUCTS OF COMBUSTION, INTRODUCING A SECOND QUANTITY OF FUEL AND AIR INTO THE HIGH VELOCITY FLOW OF PRODUCTS OF COMBUSTION AT THE POINT OF EMISSION FROM THE CONFINED CHAMBER AND DIRECTING THE FLAME JET INTO CONTACT WITH AN EXPOSED SURFACE OF SAID MINERAL BODY TO INDUCE A THERMAL GRADIENT OF PREDETERMINED MINERAL STRESSING CAPABILITY WHEREBY A CONTROLLED SPALLING TAKES PLACE.
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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) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |