US3249426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-nickel ductile steel
Assignee: IHI Corp
•
Filing: 1962-04-20
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Granted: 1966-05-03
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Expires: 1982-04-20
Abstract
No abstract record available.
Inventors
- 👤 Nakamura Hajime
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:49
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A STRUCTURAL STEEL CONSISTING OF LESS THAN 0.25% CARBON, LESS THAN 0.60% SILICON, LESS THAN 1.00% MANGANESE, LESS THAN 0.030% PHOSPHORUS AND SULPHUR EACH, 1.00 TO 4.00% NICKEL, 0.02 TO 0.12% PRECIPITATED ALUMINUM NITRIDE, LESS THAN 0.15% METALLIC ALUMINUM IN SOLID SOLUTION, THE BALANCE SUBSTANTIALLY ALL IRON WITH ICIDENTAL IMPURITIES, THE STEEL HAVING A GRANULAR STRUCTURE WITH GRAIN SIZE NUMBER LARGER THAN NO. 9 IN TERMS OF THE ASTM FERRITE GRAIN SIZE NUMBER.
Claim 2
Dependent Claim
73 words
A STRUCTURAL STEEL CONSISTING OF LESS THAN 0.25% CARBON, LESS THAN 0.60% SILICON, LESS THAN 1.00% MANGANESE, LESS THAN 0.030% PHOSPHORUS AND SULPHUR EACH, 1.00 TO 4.00% NICKEL, 0.02 TO 0.12% PRECIPITATED ALUMINUM NITRIDE, LESS THAN 0.15% METALLIC ALUMINUM IN SOLID SOLUTION, THE BALANCE SUBSTANTIALLY ALL IRON WITH ICIDENTAL IMPURITIES, THE STEEL HAVING A GRANULAR STRUCTURE WITH GRAIN SIZE NUMBER LARGER THAN NO. 9 IN TERMS OF THE ASTM FERRITE GRAIN SIZE NUMBER.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |