Patent US3042697A successfully refreshed from Google Patents.
US2587900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-treatment of metals
Assignee: Individual
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Filing: 1949-10-26
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Granted: 1952-03-04
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Expires: 1969-10-26
Abstract
No abstract record available.
Inventors
- 👤 Robiette Alfred Gordon Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:35
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74; C21D1/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
THE PROCESS OF HEAT TREATING METAL IN A SUBSTANTIALLY CLOSED FURNACE IN PREHEATING AND FINAL HEATING STAGES SUCCESSIVELY, WHICH COMPRISES PASSING THE METAL TO BE TREATED IN ONE DIRECTION THROUGH THE FURNACE AND A FLUID FUEL AND A GAS CONTAINING 70% OR MORE OXYGEN IN THE OPPOSITE DIRECTION, PARTIALLY BURNING THE FUEL AND GAS AT THE EXIT END OF THE FURNACE IN DIRECT CONTACT WITH THE METAL TO PRODUCE AN ATMOSPHERE WHICH, AT THE TEMPERATURE OF TREATMENT AT SAID EXIT END, IS NON-OXIDISING TO THE METAL, AND PASSING THE PRODUCTS OF PARTIAL COMBUSTION TO THE COOLER ENTRY END OF THE FURNACE AND BURNING SAID GASES TO FURTHER COMBUSTION TO DIRECT CONTACT WITH THE METAL AT SAID ENTRY END SO AS TO PREHEAT THE METAL ENTERING THE FURNACE.
Claim 2
Dependent Claim
127 words
THE PROCESS OF HEAT TREATING METAL IN A SUBSTANTIALLY CLOSED FURNACE IN PREHEATING AND FINAL HEATING STAGES SUCCESSIVELY, WHICH COMPRISES PASSING THE METAL TO BE TREATED IN ONE DIRECTION THROUGH THE FURNACE AND A FLUID FUEL AND A GAS CONTAINING 70% OR MORE OXYGEN IN THE OPPOSITE DIRECTION, PARTIALLY BURNING THE FUEL AND GAS AT THE EXIT END OF THE FURNACE IN DIRECT CONTACT WITH THE METAL TO PRODUCE AN ATMOSPHERE WHICH, AT THE TEMPERATURE OF TREATMENT AT SAID EXIT END, IS NON-OXIDISING TO THE METAL, AND PASSING THE PRODUCTS OF PARTIAL COMBUSTION TO THE COOLER ENTRY END OF THE FURNACE AND BURNING SAID GASES TO FURTHER COMBUSTION TO DIRECT CONTACT WITH THE METAL AT SAID ENTRY END SO AS TO PREHEAT THE METAL ENTERING THE FURNACE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |