US2515670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of open-hearth steel
Assignee: Airco Inc
•
Filing: 1946-10-22
•
Granted: 1950-07-18
•
Expires: 1966-10-22
Abstract
No abstract record available.
Inventors
- 👤 George V Slottman
- 👤 Philip M Hulme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:48
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE METHOD OF MANUFACTURING OPEN HEARTH STEEL WHICH COMPRISES MELTING THE INITIAL CHARGE INCLUDING SCRAP METAL BY DIRECTING THEREON A FLAME PRODUCED BY COMBUSTION OF A MIXTURE OF FUEL AND A GAS FOR PRIMARY COMBUSTION CONTAINING MORE THAN 45% OF OXYGEN, WHILE INTRODUCING AIR FOR SECONDARY COMBUSTION CONTAINING A LOWER CONCENTRATION OF OXYGEN THAN THE GAS SUPPLIED FOR PRIMARY COMBUSTION, WHEREBY AN INTENSE, RELATIVELY SHORT FLAME IS PRODUCED, AND AFTER THE CHARGE IS MELTED SUFFICIENTLY TO HAVE A SUBSTANTIALLY LEVEL MOLTEN SURFACE, SUBSTANTIALLY REDUCING THE CONCENTRATION OF THE OXYGEN IN THE GAS SUPPLIED FOR PRIMARY COMBUSTION AND SUBSTANTIALLY INCREASING THE CONCENTRATION OF THE OXYGEN OF THE AIR SUPPLIED FOR SECONDARY COMBUSTION TO PRODUCE A RELATIVELY LONGER AND RELATIVELY LESS INTENSE FLAME.
Claim 2
Independent Claim
121 words
THE METHOD OF MANUFACTURING OPEN HEARTH STEEL WHICH COMPRISES MELTING THE INITIAL CHARGE INCLUDING SCRAP METAL BY DIRECTING THEREON A FLAME PRODUCED BY COMBUSTION OF A MIXTURE OF FUEL AND A GAS FOR PRIMARY COMBUSTION CONTAINING MORE THAN 45% OF OXYGEN, WHILE INTRODUCING AIR FOR SECONDARY COMBUSTION CONTAINING A LOWER CONCENTRATION OF OXYGEN THAN THE GAS SUPPLIED FOR PRIMARY COMBUSTION, WHEREBY AN INTENSE, RELATIVELY SHORT FLAME IS PRODUCED, AND AFTER THE CHARGE IS MELTED SUFFICIENTLY TO HAVE A SUBSTANTIALLY LEVEL MOLTEN SURFACE, SUBSTANTIALLY REDUCING THE CONCENTRATION OF THE OXYGEN IN THE GAS SUPPLIED FOR PRIMARY COMBUSTION AND SUBSTANTIALLY INCREASING THE CONCENTRATION OF THE OXYGEN OF THE AIR SUPPLIED FOR SECONDARY COMBUSTION TO PRODUCE A RELATIVELY LONGER AND RELATIVELY LESS INTENSE FLAME.
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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) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |