Patent US2909425A successfully refreshed from Google Patents.
US2909425A
Expired / Lapsed
US
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Austenitic cr-mn-c-n steels for elevated temperature service
Assignee: Crucible Steel Company of America
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Filing: 1957-05-31
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Granted: 1959-10-20
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Expires: 1977-05-31
Abstract
No abstract record available.
Inventors
- 👤 Hsiao Chi-Mei
- 👤 Edward J Dulis
- 👤 Payson Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:21
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/001; C22C38/18; C22C38/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
83 words
AN ALLOY STEEL CONTAINING ABOUT: 0.2 TO 0.8% CARBON, 10 TO 14% MANGANESE, 14 TO 26% CHROMINUM, 0.2 TO 0.8% NITROGEN,. 2 TO 7% OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF MOLYBDENUM, VANADIUM, TUNGSTEN AND COLUMBIUM, UP TO 20% SILICON, BALANCE SUBSTANTIALLY ALL IRON, THE CARBON PLUS NITROGEN CONTENT OF SAID ALLOY BEING GREATER THAN 0.078 (CHROMIUM EQUIVALENT-12.5), SAID ALLOY BEING CHARACTERIZED BY A WHOLLY AUSTENITIC STRUCTURE AND BY HIGH CREEP STRENGTH AT ELEVATED TEMPERATURES IN EXCESS OF 1100*F.
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) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |