Patent US2880085A successfully refreshed from Google Patents.
US2880085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferritic alloy steels for use at elevated temperatures
Assignee: Firth Vickers Stainless Steels Ltd
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Filing: 1957-03-11
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Granted: 1959-03-31
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Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 Kirkby Henry William
- 👤 Sykes Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:01
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A FORGEABLE FERRITIC ALLOY STEEL COMPRISING 0.03 TO 0.30% CARBON, 4 TO 20% CHROMIUM, OVER 3 AND UP TO 16% TUNGSTEN, 0.1 TO 0.0% VANADIUM AND 0.05 TO 2.5% OF AT LEAST ONE ELEMENT FROM THE GROUP CONSISTING OF NIOBIUM AND TANTALUM, AND THE BALANCE IRON WITH INCIDENTAL IMPURITIES IN ORDINARY AMOUNTS.
Claim 2
Dependent Claim
52 words
A FORGEABLE FERRITIC ALLOY STEEL COMPRISING 0.03 TO 0.30% CARBON, 4 TO 20% CHROMIUM, OVER 3 AND UP TO 16% TUNGSTEN, 0.1 TO 0.0% VANADIUM AND 0.05 TO 2.5% OF AT LEAST ONE ELEMENT FROM THE GROUP CONSISTING OF NIOBIUM AND TANTALUM, AND THE BALANCE IRON WITH INCIDENTAL IMPURITIES IN ORDINARY AMOUNTS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |