Patent US2645574A successfully refreshed from Google Patents.
US2645574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel for high-temperature use
Assignee: Timken Co
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Filing: 1951-09-11
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Granted: 1953-07-14
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Expires: 1971-09-11
Abstract
No abstract record available.
Inventors
- 👤 Claude L Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:08
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A FORGEABLE STEEL ALLOY WHICH AS NORMALIZED FROM 1750* F. AND TEMPERED AT 1200* F. TO A BRINELL HARDNESS FO 300/350 IS CHARACTERIZED BY HIGH STRENGTH AT ROOM AND ELEVATED TEMPERATURES AND BY A 1000 HOUR RUPTURE STRENGTH AT 1100* F. OF AT LEAST 30,000 POUNDS PER SQUARE INCH AND HAVING SUBSTANTIALLY THE COMPOSITION: 0.18 TO 0.28 PER CENT OF CARBON, 1 TO 2 PER CENT OF CHROMIUM, 0.3 TO 0.6 PER CENT OF MANGANESE, 0.4 TO 0.6 PER CENT OF MOLYBDENUM, 0.5 TO 1 PER CENT OF SILICON, AND 0.7 TO 0.9 PER CENT OF VANADIUM AND THE REMAINDER IRON TOGETHER WITH IMPURITIES AND ELEMENTS IN AMOUNTS THAT DO NOT ADVERSELY AFFECT THE PROPERTIES.
Claim 2
Dependent Claim
115 words
A FORGEABLE STEEL ALLOY WHICH AS NORMALIZED FROM 1750* F. AND TEMPERED AT 1200* F. TO A BRINELL HARDNESS FO 300/350 IS CHARACTERIZED BY HIGH STRENGTH AT ROOM AND ELEVATED TEMPERATURES AND BY A 1000 HOUR RUPTURE STRENGTH AT 1100* F. OF AT LEAST 30,000 POUNDS PER SQUARE INCH AND HAVING SUBSTANTIALLY THE COMPOSITION: 0.18 TO 0.28 PER CENT OF CARBON, 1 TO 2 PER CENT OF CHROMIUM, 0.3 TO 0.6 PER CENT OF MANGANESE, 0.4 TO 0.6 PER CENT OF MOLYBDENUM, 0.5 TO 1 PER CENT OF SILICON, AND 0.7 TO 0.9 PER CENT OF VANADIUM AND THE REMAINDER IRON TOGETHER WITH IMPURITIES AND ELEMENTS IN AMOUNTS THAT DO NOT ADVERSELY AFFECT THE PROPERTIES.
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) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |