Patent US2924543A successfully refreshed from Google Patents.
US2924543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold-finished steels and method for manufacturing same
Assignee: Lasalle Steel Co
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Filing: 1956-10-22
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Granted: 1960-02-09
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Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 Elliot S Nachtman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:59
CPC Classifications
C; C21; C21D; C21D8/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
THE METALLURGICAL PROCESS FOR IMPROVING THE CHARACTERISTICS OF STEEL WHICH STRAIN-HARDENS AND WHICH HARDENS BY SOME MODE OF PRECIPITATION WHEN WORKED AT A TEMPERATURE BETWEEN 200*F. AND THE LOWER CIRTICAL TEMPERATURE FOR THE STEEL COMPOSITION COMPRISING THE COMBINATION OF STEPS OF AUSTENITIZING THE STEEL AND QUENCHING THE AUSTENITIZED STEEL TO EFFECT A PHASE CHANGE TO MARTENSIT, AND THEN WORKING THE MARTENSITIC STEEL TO EFFECT REDUCTION IN CROSS-SECTIONAL AREA WHILE THE STEEL IS AT A TEMPERATURE WITHIN THE RANGE OF 400*F. TO THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION.
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) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |