US2903386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-hardened stainless steel and method for cold treating same
Assignee: Armco Inc
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Filing: 1955-10-27
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Granted: 1959-09-08
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Expires: 1975-10-27
Abstract
No abstract record available.
Inventors
- 👤 James H Waxweiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:33
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C21; C21D; C21D6/00; C21D6/04; C22C38/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN THE PRODUCTION OF HEAT-HARDENED AUSTENITIC ACHROMIUM-NICKEL STAINLESS STEEL OF HIGH YIELD STRENGTH, THE ART WHICH COMPRISES PROVIDING A STEEL ESSENTIALLY CONSISTING OF CARBON .08% TO .30%, MANGANESE UP TO 5.00%, SILICON UP TO 1.00%, CHROMIUM 12.0% TO 21.0%, NICKEL 3.0% TO 10.0%, NITROGEN UP TO .15%, AND REMAINDER SUBSTANTIALLY ALL IRON, THE RELATIVE AMOUNTS OF SAID CARBON, MANGANESE, NICKEL AND NITROGEN, ON THE ONE HAND, AND SILICON AND CHROMIUM ON THE OTHER, BEING SUBSTANTIALLY IN ACCORDANCE WITH THE AREA A,B,C AND D OF THE ACCOMPANYING DIAGRAM; ANNEALING THE SAME AT A TEMPERATURE OF ABOUT 1400* TO 2250* F. AND COOLING; TRANS-
Claim 2
Dependent Claim
102 words
IN THE PRODUCTION OF HEAT-HARDENED AUSTENITIC ACHROMIUM-NICKEL STAINLESS STEEL OF HIGH YIELD STRENGTH, THE ART WHICH COMPRISES PROVIDING A STEEL ESSENTIALLY CONSISTING OF CARBON .08% TO .30%, MANGANESE UP TO 5.00%, SILICON UP TO 1.00%, CHROMIUM 12.0% TO 21.0%, NICKEL 3.0% TO 10.0%, NITROGEN UP TO .15%, AND REMAINDER SUBSTANTIALLY ALL IRON, THE RELATIVE AMOUNTS OF SAID CARBON, MANGANESE, NICKEL AND NITROGEN, ON THE ONE HAND, AND SILICON AND CHROMIUM ON THE OTHER, BEING SUBSTANTIALLY IN ACCORDANCE WITH THE AREA A,B,C AND D OF THE ACCOMPANYING DIAGRAM; ANNEALING THE SAME AT A TEMPERATURE OF ABOUT 1400* TO 2250* F. AND COOLING; TRANS-
References Cited (Backward Citations)
US2799602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |