US3196053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of heat-treated sheets
Assignee: United States Steel Corp
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Filing: 1962-08-13
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Granted: 1965-07-20
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Expires: 1982-08-13
Abstract
No abstract record available.
Inventors
- 👤 John M Hodge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:04
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/0247; C21D8/0263; C21D1/00; C21D1/18; C21D2211/00; C21D2211/002; C21D2211/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF PRODUCING FLAT HEAT-TREATED STEEL SHEETS COMPRISING DRASTICALLY QUENCHING FROM AN AUSTENITIZING TEMPERATURE A SHEET OF HOT-ROLLED STEEL CAPABLE OF CONVERSION TO MARTENSITE OR LOWER BAINITE TO TRANSFORM THE SAME TO A MICROSTRUCTURE CONSISTING SUBSTANTIALLY OF MARTENSITE OR LOWER BAINITE, SUCH QUENCHING PRODUCING DISTORTION THEREIN, TEMPERING SAID STEEL AT A TEMPERATURE ABOVE ABOUT 1000*F. AND BELOW ITS LOWER CRITICAL TEMPERATURE, COLD REDUCING SAID STEEL BETWEEN 10 AND 50% TO THE DESIRED THICKNESS AND THEN HEATING THE COLD-REDUCED STEEL AT A TEMPERATURE ABOVE ITS RECRYSTALLIZATION TEMPERATURE BUT NOT ABOVE FIRST-MENTIONED TEMPERING TEMPERATURE.
Claim 2
Independent Claim
93 words
A METHOD OF PRODUCING FLAT HEAT-TREATED STEEL SHEETS COMPRISING DRASTICALLY QUENCHING FROM AN AUSTENITIZING TEMPERATURE A SHEET OF HOT-ROLLED STEEL CAPABLE OF CONVERSION TO MARTENSITE OR LOWER BAINITE TO TRANSFORM THE SAME TO A MICROSTRUCTURE CONSISTING SUBSTANTIALLY OF MARTENSITE OR LOWER BAINITE, SUCH QUENCHING PRODUCING DISTORTION THEREIN, TEMPERING SAID STEEL AT A TEMPERATURE ABOVE ABOUT 1000*F. AND BELOW ITS LOWER CRITICAL TEMPERATURE, COLD REDUCING SAID STEEL BETWEEN 10 AND 50% TO THE DESIRED THICKNESS AND THEN HEATING THE COLD-REDUCED STEEL AT A TEMPERATURE ABOVE ITS RECRYSTALLIZATION TEMPERATURE BUT NOT ABOVE FIRST-MENTIONED TEMPERING TEMPERATURE.
References Cited (Backward Citations)
GB782356A
Cited
US3053703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |