US2737455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferritic creep-resisting steels
Assignee: Thos Firth & John Brown Ltd
•
Filing: 1953-04-01
•
Granted: 1956-03-06
•
Expires: 1973-04-01
Abstract
No abstract record available.
Inventors
- 👤 Kirkby Henry William
- 👤 Sykes Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:44
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/32; C22C38/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A CREEP RESISTANT FERRITIC ALLOY STEEL COMPRISING CARBON 0.02 TO 0.15%, SILICON 0.05 TO 1.0%, MANGANESE 0.05 TO 2.0%, CHROMIUM 0.10 TO 3.5%, VANADIUM 0.05 TO 1.0%, TITANIUM 0.0K TO 0.40%, BORON 0.003 TO 0.05% AND THE BALANCE IRON WITH IMPURITIES IN ORDINARY AMOUNTS.
Claim 2
Dependent Claim
44 words
A CREEP RESISTANT FERRITIC ALLOY STEEL COMPRISING CARBON 0.02 TO 0.15%, SILICON 0.05 TO 1.0%, MANGANESE 0.05 TO 2.0%, CHROMIUM 0.10 TO 3.5%, VANADIUM 0.05 TO 1.0%, TITANIUM 0.0K TO 0.40%, BORON 0.003 TO 0.05% AND THE BALANCE IRON WITH 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) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |