US2540509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-temperature stainless steel
Assignee: Armco Inc
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Filing: 1947-10-14
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Granted: 1951-02-06
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Expires: 1967-10-14
Abstract
No abstract record available.
Inventors
- 👤 Jr William Charles Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
AUSTENITIC STAINLESS STEEL SUBSTANTIALLY FREE OF SIGMA PHASE AT ELEVATED TEMPERATURES, SAID STEEL CONTAINING APPROXIMATELY 0.09% TO 0.20% CARBON, 15.75% TO 16.75% CHROMIUM, FROM 13.25% TO 14.75% NICKEL, 1.75% TO 2.8% MOLYBDENUM, FROM 2.5% TO 3.5% COPPER, 0.10% TO 0.25% TITANIUM, 0.35% TO 0.55% COLUMBIUM, FROM 0.20% TO 1.5% MANGANESE, UP TO 0.70 SILICON, AND THEN REMAINDER SUBSTANTIALLY ALL IRON.
Claim 2
Dependent Claim
60 words
AUSTENITIC STAINLESS STEEL SUBSTANTIALLY FREE OF SIGMA PHASE AT ELEVATED TEMPERATURES, SAID STEEL CONTAINING APPROXIMATELY 0.09% TO 0.20% CARBON, 15.75% TO 16.75% CHROMIUM, FROM 13.25% TO 14.75% NICKEL, 1.75% TO 2.8% MOLYBDENUM, FROM 2.5% TO 3.5% COPPER, 0.10% TO 0.25% TITANIUM, 0.35% TO 0.55% COLUMBIUM, FROM 0.20% TO 1.5% MANGANESE, UP TO 0.70 SILICON, AND THEN REMAINDER SUBSTANTIALLY ALL IRON.
References Cited (Backward Citations)
US2080367A
Cited
US2225730A
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US2398702A
Cited
GB577892A
Cited
US2402814A
Cited
US2451547A
Cited
US2447897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |