US3826692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing heat resisting steel sheet for deep drawing
Assignee: KENKYUSHO G NIPPON KOKAN KK
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Filing: 1972-12-29
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Granted: 1974-07-30
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Expires: 1992-12-29
Abstract
Abstract A METHOD FOR MANUFACTURING STEEL SHEET HAIVNG GOOD COLD FORMABILITY COMPRISING HOT ROLLING STEEL WHICH CONTAINS LESS THAN 0.10% C (LESS THAN 0.15% ANNEALING FOR DECARBURIZATION),LESS THAN 0.15% SI, LESS THAN 0.25% MN, 0.4% TO 1.5% CR, LESS THAN 0.8% MO, LESS THAN 0.5% 0.5% AL AND UNAVOIDABLE IMPURITIES, COLD ROLLING AT A REDUCTION RATE OF MORE THAN 30% AND ANNEALING FOR RECRYSTALLIZTION AT A TEMPERATURE ABOVE 700*C.
Inventors
- 👤 K Kinoshita
- 👤 T Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/0421; C21D8/0436; C21D3/00; C21D3/02; C21D3/04; C21D8/0447; C21D8/0473
Claims Analysis
Total Claims: 0
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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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |