Patent US2778731A successfully refreshed from Google Patents.
US2778731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion-resistant austenitic steel not requiring nickel
Assignee: United States Steel Corp
•
Filing: 1953-11-19
•
Granted: 1957-01-22
•
Expires: 1973-11-19
Abstract
No abstract record available.
Inventors
- 👤 Dennis J Carney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:24
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
ALLOY STEEL CONSISTING OF FROM .06 TO .15% CARBON, FROM 14 TO 20% MANGANESE, FROM 17 TO 18.5% CHROMIUM, FROM .05 TO 1.00% NICKEL, FROM .25 TO 1.0% SILICON, FROM .25 TO 1.0% NITROGEN AND THE BALANCE IRON EXCEPT FOR RESIUDAL IMPURITIES USUALLY PRESENT IN SUCH STEEL, THE RATIO OF NITROGEN TO CHROMIUM BEING BETWEEN .015 AND .035, SAID STEEL EXHIBITING GOOD CORROSION RESISTANCE, GOOD ROLLING AND FORGING QUALITIES AND BEING HIGHLY AUSTENITIC.
Claim 2
Dependent Claim
73 words
ALLOY STEEL CONSISTING OF FROM .06 TO .15% CARBON, FROM 14 TO 20% MANGANESE, FROM 17 TO 18.5% CHROMIUM, FROM .05 TO 1.00% NICKEL, FROM .25 TO 1.0% SILICON, FROM .25 TO 1.0% NITROGEN AND THE BALANCE IRON EXCEPT FOR RESIUDAL IMPURITIES USUALLY PRESENT IN SUCH STEEL, THE RATIO OF NITROGEN TO CHROMIUM BEING BETWEEN .015 AND .035, SAID STEEL EXHIBITING GOOD CORROSION RESISTANCE, GOOD ROLLING AND FORGING QUALITIES AND BEING HIGHLY AUSTENITIC.
References Cited (Backward Citations)
AT152291B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |