Patent US2883281A successfully refreshed from Google Patents.
US2883281A
Expired / Lapsed
US
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Air hardening graphitic steel
Assignee: Timken Co
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Filing: 1957-12-06
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Granted: 1959-04-21
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Expires: 1977-12-06
Abstract
No abstract record available.
Inventors
- 👤 Chester F Jatczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:55
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
STEEL CONTAINING ABOUT 1.35 PERCENT OF CARBON, LESS THAN ABOUT 0.15 PERCENT OF CHROMIUM, ABOUT 1.85 PERCENT OF MANGANESE, ABOUT 1.4 TO 1.6 PERCENT OF MOLYBDENUM, ABOUT 1.8 TO 1.9 PERCENT OF NICKEL, AND ABOUT 1.15 TO 1.25 PERCENT OF SILICON, AND THE REMAINDER IRON TOGETHER WITH ELEMENTS AND IMPURITIES IN AMOUNTS THAT DO NOT ADVERSELY AFFECT THE HARDENABILITY AND GRAPHITIZING PROPERTIES, SAID STEEL BEING CHARACTERIZED BY CAPABILITY OF BEING HOT WORKED AND UPON COOLING IN AIR FROM AN AUSTENITIZING TEMPERATURE OF PRODUCING STRUCTURES OF SPHEROIDIZED CARBIDES WITH AT LEAST ABOUT 0.2 PERCENT OF GRAPHITIC CARBON SUBSTANTIALLY UNIFORMLY DISTRIBUTED THROUGHOUT ITS SECTION, AND HAVING A HARDNESS OF AT LEAST ROCKWELL C 58 THROUGHOUT SECTION AT LEAST AS GREAT AS SIX INCHES DIAMETER.
References Cited (Backward Citations)
US1910034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |