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US3701694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment method for ferrite-pearlite steel
Assignee: JFE Engineering Corp
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Filing: 1969-11-19
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Granted: 1972-10-31
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Expires: 1989-11-19
Abstract
Abstract THE INVENTION RELATES TO A HOT FORMING METHOD FOR PRODUCING STEEL WITH A FERRITE-PEARLITE STRUCTURE. THE STEEL OF THE INVENTION HAS IMPROVED TOUGHNESS.
Inventors
- 👤 Tatsumi Osuka
- 👤 Chiaki Oouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:30
CPC Classifications
C; C21; C21D; C21D8/00
Claims Analysis
Total Claims: 0
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |