US2590835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloy steels
Assignee: Firth Vickers Stainless Steels Ltd
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Filing: 1949-11-10
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Granted: 1952-04-01
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Expires: 1969-11-10
Abstract
No abstract record available.
Inventors
- 👤 Kirkby Henry William
- 👤 Sykes Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:21
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A FORGEABLE FERRITC ALLOY STEEL POSSESSING HIGH CREEP RESISTANCE AT TEMPERATURE AT LEAST UP TO 700* C., AND HAVING A COMPOSITION CHARATER ISED BY THE ABSENCE OF NICKEL ABOVE A PROPORTION OF 1.5% AND BY THE PRESENCE AS ESSENTIAL CONSTITUENTS OF 0.05-0.5% CARBON, 4-20% CHROMIUM, 0.5-3% MOLYBDENUM INTERCHANGABLE AT LEAST IN PART WITH TUNGSTEN, AN EFFECTIVE PROPORTION UP TO 2.5% COLUMBIUM, AN EFFECTIVE PROPORTION UP TO 0.25% NITROGEN, AN EFFECTIVE PROPORTION UP TO 0.5% BORON, 0.1-2% VANADIUM, AND THE BALANCE SUBSTANTIALLY IRON.
Claim 2
Dependent Claim
82 words
A FORGEABLE FERRITC ALLOY STEEL POSSESSING HIGH CREEP RESISTANCE AT TEMPERATURE AT LEAST UP TO 700* C., AND HAVING A COMPOSITION CHARATER ISED BY THE ABSENCE OF NICKEL ABOVE A PROPORTION OF 1.5% AND BY THE PRESENCE AS ESSENTIAL CONSTITUENTS OF 0.05-0.5% CARBON, 4-20% CHROMIUM, 0.5-3% MOLYBDENUM INTERCHANGABLE AT LEAST IN PART WITH TUNGSTEN, AN EFFECTIVE PROPORTION UP TO 2.5% COLUMBIUM, AN EFFECTIVE PROPORTION UP TO 0.25% NITROGEN, AN EFFECTIVE PROPORTION UP TO 0.5% BORON, 0.1-2% VANADIUM, AND THE BALANCE SUBSTANTIALLY IRON.
References Cited (Backward Citations)
US2432616A
Cited
US2432617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |