US2563672A
Expired / Lapsed
US
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Machinability of quench-hardened alloy steels containing retained austenite
Assignee: United States Steel Corp
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Filing: 1950-02-07
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Granted: 1951-08-07
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Expires: 1970-02-07
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Boyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:58
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/18; C21D1/19; C21D1/20; C21D2211/00; C21D2211/001; C21D2211/002; C21D2211/008
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
A METHOD OF IMPROVING MACHINABILITY OF QUENCH-HARDENED STEELS CONTAINING MARTENSITE AND RETAINED AUSTENITE COMPRISING HOLDING SUCH STEELS AT ABOUT THE TEMPERATURE OF THE BAINITE NOSE OF THE ISOTHERMAL TRANSFORMATION DIAGRAM OF THE STEEL FOR SUFFICIENT TIME TO TRANSFORM THE AUSTENITE TO BAINITE AND THEN RAISING THE TEMPERATURE TO BETWEEN THE AE1 POINT OF THE STEEL AND THE TEMPERATURE OF THE PEARLITE NOSE OF THE
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) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |