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US3717455A
Expired / Lapsed
US
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Stainless ferrite-austenitic steel
Assignee: Saab Bofors AB
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Filing: 1970-02-16
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Granted: 1973-02-20
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Expires: 1990-02-16
Abstract
Abstract A PROCESS OF PRODUCING A STAINLESS FERRITIC-AUSTENITIC STEEL HAVING HIGH RESISTANCE TO INTERCRYSTALLINE CORROSION IS DISCLOSED. THE PROCESS COMPRISES ADDING TO THE STEEL TITAINUM IN SUCH AN AMOUNT THAT THE QUOTIENT TIREST/C IS AT LEAST 4. TIREST IS THE TOTAL TITANIUM PRESENT MINUS THE QUANTITIES CONSUMED TO FORM TITANIUM NITRIDE, TITANIUM OXIDE OR OTHER TITANIUM COMPOUNDS. C IS THE TOTAL CARBON CONTENT OF THE STEEL.
Inventors
- 👤 N Hede
- 👤 L Hellner
- 👤 H Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:32
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44; C22C38/50
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |