US2938820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of spheroidizing steel by rapid heating
Assignee: Selas Corp of America
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Filing: 1958-04-24
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Granted: 1960-05-31
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Expires: 1978-04-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles A Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:08
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/26; C21D1/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
THE METHOD OF SPHEROIDIZING CARBON AND LOW ALLOY STEEL WHICH COMPRISES MOVING THE STEEL CONTINUOUSLY THROUGH A FURNACE AT A TEMPERATURE SUFFICIENTLY ABOVE THE TEMPERATURE OF THE STEEL TO RAISE THE STEEL TEMPERATURE FROM 100*F. TO 300*F. ABOVE THE LOWER CRITICAL TEMPERTURE AT A RATE FAST ENOUGH THAT THE CARBIDES IN THE STEEL DO NOT HAVE TIME TO DISSOLVE, AND IMMEDIATELY UPON THE ATTAINMENT OF SUCH TEMPERATURE AIR COOLING THE STEEL.
Claim 2
Independent Claim
71 words
THE METHOD OF SPHEROIDIZING CARBON AND LOW ALLOY STEEL WHICH COMPRISES MOVING THE STEEL CONTINUOUSLY THROUGH A FURNACE AT A TEMPERATURE SUFFICIENTLY ABOVE THE TEMPERATURE OF THE STEEL TO RAISE THE STEEL TEMPERATURE FROM 100*F. TO 300*F. ABOVE THE LOWER CRITICAL TEMPERTURE AT A RATE FAST ENOUGH THAT THE CARBIDES IN THE STEEL DO NOT HAVE TIME TO DISSOLVE, AND IMMEDIATELY UPON THE ATTAINMENT OF SUCH TEMPERATURE AIR COOLING THE STEEL.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |