Patent US3716420A successfully refreshed from Google Patents.
US3716420A
Expired / Lapsed
US
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Hot rolled steel sheets for extra deep drawing
Assignee: JFE Engineering Corp
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Filing: 1971-11-08
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Granted: 1973-02-13
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Expires: 1991-11-08
Abstract
Abstract A HOT ROLLED STEEL SHEET HAVING EXTRA DEEP DRAWING AND PRESS FORMABILITY PROPERTIES COMPARABLE TO COLD ROLLED STEEL SHEETS, WHEREIN THE STEEL IS VACUUM DEGASSES AND HAS A COMPOSITION CONSISTING ESSENTIALLY OF: 0.001-0.020% CARBON, LESS THAN 0.10% SILICON, 0.10-0.60% MANGANESE, LESS THAN 0.020% SULPHUR, 0.010-0.10% ALUMINUM, 0.020.08% TITANIUM, BALANCE IRON AND INCIDENTAL IMPURITIES AND WHEREIN TI/C<4 AND TI/S>2. THE STEEL SHEETS ARE HOT ROLLED WITH A FINISHING TEMPERATURE IN THE RANGE 800950*C. AND COLLED AT A TEMPERATURE IN THE RANGE 650*C.700*C.
Inventors
- 👤 K Matsudo
- 👤 Y Ikegami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:24
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/0421; C21D8/0426; C22; C22C; C22C38/00; C22C38/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49988; Y10T29/49991
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |