US2820708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel and method of producing same
Assignee: Armco Inc
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Filing: 1955-05-17
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Granted: 1958-01-21
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Expires: 1975-05-17
Abstract
No abstract record available.
Inventors
- 👤 James H Waxweiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:07
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
HEAT-HARDENED AUSTENITIC CHROMIUM-NICKEL STAINLESS STEEL CAST ARTICLES ESSENTIALLY CONSISTING OF CHROMIUM 12.0% TO 21.0%, NICKEL UP TO 11.5%, CARBON UP TO .20%, MANGANESE UP TO 5.0%, SILICON UP TO 2.00%, NITROGEN UP TO .20%, AND REMAINDER SUBSTANTIALLY ALL IRON, THE RELATIVE AMOUNTS OF SAID CHROMIUM AND SILICON ON THE ONE HAND AND NICKEL, MANGANESE, CARBON AND NITROGEN ON THE OTHER BEING SUBSTANTIALLY IN ACCORDANCE WITH THE AREA A, B, C AND D OF THE ACCOMPANYING DIAGRAM; SAID ARTICLES HAVING BEEN TRANSFORMED BY HEATING AT A TEMPERATURE OF 1200* TO 1700*F. AND COOLING AND THEN HARDENED BY HEAT-TREATING AT A TEMPERATURE OF 300* TO 1150*F.
Claim 2
Dependent Claim
104 words
HEAT-HARDENED AUSTENITIC CHROMIUM-NICKEL STAINLESS STEEL CAST ARTICLES ESSENTIALLY CONSISTING OF CHROMIUM 12.0% TO 21.0%, NICKEL UP TO 11.5%, CARBON UP TO .20%, MANGANESE UP TO 5.0%, SILICON UP TO 2.00%, NITROGEN UP TO .20%, AND REMAINDER SUBSTANTIALLY ALL IRON, THE RELATIVE AMOUNTS OF SAID CHROMIUM AND SILICON ON THE ONE HAND AND NICKEL, MANGANESE, CARBON AND NITROGEN ON THE OTHER BEING SUBSTANTIALLY IN ACCORDANCE WITH THE AREA A, B, C AND D OF THE ACCOMPANYING DIAGRAM; SAID ARTICLES HAVING BEEN TRANSFORMED BY HEATING AT A TEMPERATURE OF 1200* TO 1700*F. AND COOLING AND THEN HARDENED BY HEAT-TREATING AT A TEMPERATURE OF 300* TO 1150*F.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |