US3155495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitride containing ductile steel
Assignee: IHI Corp
•
Filing: 1962-01-04
•
Granted: 1964-11-03
•
Expires: 1982-01-04
Abstract
No abstract record available.
Inventors
- 👤 Nakamura Hajime
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:58
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/06; C22C38/08; C22C38/40
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
IN A DUCTILE STEEL COMPOSITION CONSISTING ESSENTIALLY OF 0.04-0.25% CARBON, 0.01-0.5% SILICON, UP TO 1.0% MANGANESE, LESS THAN 0.035% PHOSPHORUS, LESS THAN 0.035% SULPHUR, 0.03-0.12% PRECIPITATED ALUMINUM NITRIDE, AND AT LEAST ONE OF THE ELEMENTS NICKEL, CHROMIUM, MOLYBDENUM, VANADIUM AND COPPER FROM TRACES UP TO 1.0% AND BORON UP TO 0.1%, IN ADDITION TO THE IRON CONTENT, THE IMPROVEMENT WHICH CONSISTS OF METALLIC ALUMI-
References Cited (Backward Citations)
US2679454A
Cited
GB808556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |