US2835571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel for use at elevated temperature
Assignee: United States Steel Corp
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Filing: 1957-07-02
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Granted: 1958-05-20
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Expires: 1977-07-02
Abstract
No abstract record available.
Inventors
- 👤 George V Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:56
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A FORGETABLE FERRITIC CHROMIMUM STEEL OF THE 8% TYPE CHARACTERIZED BY A HIGH 100-HOUR STRESS-REPTURE STRENGTH AT 1100*F. IN THE QUENCHED AND TEMPERED CONDITIONS, SAID STEEL CONTAINING .25% MAXIMUM CARBON, 7.50 TO 8.25% CHROMIUM, 2.70 TO 3.40% MOLYBDEMUM, 3.00% MAXIMUM MANGANSES, .75% MAXIMUM SILICON WOTH THE BALANCE IRON AND OTHER ELEMENTS IN AMOUNTS WHICH DO NOT ADVERSELY AFFECT THE PROPERTIES.
Claim 2
Dependent Claim
60 words
A FORGETABLE FERRITIC CHROMIMUM STEEL OF THE 8% TYPE CHARACTERIZED BY A HIGH 100-HOUR STRESS-REPTURE STRENGTH AT 1100*F. IN THE QUENCHED AND TEMPERED CONDITIONS, SAID STEEL CONTAINING .25% MAXIMUM CARBON, 7.50 TO 8.25% CHROMIUM, 2.70 TO 3.40% MOLYBDEMUM, 3.00% MAXIMUM MANGANSES, .75% MAXIMUM SILICON WOTH THE BALANCE IRON AND OTHER ELEMENTS IN AMOUNTS WHICH DO NOT ADVERSELY AFFECT THE PROPERTIES.
References Cited (Backward Citations)
US1876091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |