US3331594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for scale free heating of metals
Assignee: North American Manufacturing Co
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Filing: 1965-02-23
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Granted: 1967-07-18
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Expires: 1985-02-23
Abstract
No abstract record available.
Inventors
- 👤 Theodore E Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:07
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR SCALE FREE HEATING OF METAL COMPRISING BURNING GAS WITH LESS THAN THE STOICHIOMETRIC AMOUNT OF AIR IN A PRIMARY AIR-GAS FUEL MIXTURE BENEATH THE METAL WHEREBY THE METAL IS HEATED BY PRIMARY COMBUSTION PRODUCTS PASSING UP AND OVER THE METAL AND SUBSEQUENTLY BURNING THE PRIMARY COMBUSTION PRODUCTS WITH SUFFICIENT SECONDARY AIR TO MAKE UP THE STOICHIOMETRIC AMOUNT DIRECTLY ABOVE THE METAL WITHOUT AN INTERVENING WALL WHEREBY THE METAL IS HEATED BY RADIATION FROM THE SECONDARY COMBUSTION AND FURTHER DIVIDING THE SECONDARY AIR INTO MIDDLE AND UPPER SECONDARY AIR WITH THE MIDDLE SECONDARY AIR BEING APPROXIMATELY FOUR TIMES THE QUANTITY OF THE UPPER SECONDARY AIR.
Claim 2
Dependent Claim
107 words
A PROCESS FOR SCALE FREE HEATING OF METAL COMPRISING BURNING GAS WITH LESS THAN THE STOICHIOMETRIC AMOUNT OF AIR IN A PRIMARY AIR-GAS FUEL MIXTURE BENEATH THE METAL WHEREBY THE METAL IS HEATED BY PRIMARY COMBUSTION PRODUCTS PASSING UP AND OVER THE METAL AND SUBSEQUENTLY BURNING THE PRIMARY COMBUSTION PRODUCTS WITH SUFFICIENT SECONDARY AIR TO MAKE UP THE STOICHIOMETRIC AMOUNT DIRECTLY ABOVE THE METAL WITHOUT AN INTERVENING WALL WHEREBY THE METAL IS HEATED BY RADIATION FROM THE SECONDARY COMBUSTION AND FURTHER DIVIDING THE SECONDARY AIR INTO MIDDLE AND UPPER SECONDARY AIR WITH THE MIDDLE SECONDARY AIR BEING APPROXIMATELY FOUR TIMES THE QUANTITY OF THE UPPER SECONDARY AIR.
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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |