US3834897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-carbon,high-strength structural steel with good weldability
Assignee: Ovako Bar Oy
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Filing: 1973-02-13
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Granted: 1974-09-10
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Expires: 1993-02-13
Abstract
Abstract HIGH STRENGTH STRUCTURAL STEELS HAVING GOOD WELDABILITY CONTAIN 0.04% TO 0.6% CARBON, FROM 0.6% TO 2.0% MANGANESE, FROM 0.1% TO 0.5% SILICON, FROM 2% TO 5% CHROMIUM, FROM 0.01% TO 0.05% METALLIC ALUMU INUM, FROM 0.03% TO 0.1% NIOBIUM, THE BALANCE, APART FROM INCIDENTAL IMPURITIES, BEING IRON.
Inventors
- 👤 H Nevalainen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:11
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/26
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |