Patent US3725049A successfully refreshed from Google Patents.
US3725049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-skilled high tensile strength steels
Assignee: Nippon Steel Corp
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Filing: 1970-08-12
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Granted: 1973-04-03
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Expires: 1990-08-12
Abstract
Abstract SEMI-KILLED STEEL COMPOSITION EXHIBITING HIGH TENSILE STRENGTH AND CONTAINING MANGANESE AND AT LEAST ONE OF THE METALS COLUMBIUM AND VANADIUM WHILE BEING DEVOID OF LARGE NON-METALLIC INCLUSIONS. THE SEMI-KILLED STEEL COMPOSITION IS CHARACTERIZED IN THAT IT HAS BEEN DEOXIDIZED BY ALUMINUM ALONE WHEREBY THE FORMATION OF INCLUSIONS OF MANGGANESE SILICATE LARGER THAN 100U IS AVOIDED. FURTHER, THE ALUMINA INCLUSIONS FORMED BY THE ALUMINUM DEOXIDATION ARE NOT LARGER THAN 100U. THERE IS LITTLE TENDENCY TOWARD CRACK FORMATION IN ARTICLES MANUFACTURED FROM THE INSTANT STEEL COMPOSITION.
Inventors
- 👤 S Ono
- 👤 H Horiguchi
- 👤 S Satoh
- 👤 H Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:17
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/12
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |