Patent US2528637A successfully refreshed from Google Patents.
US2528637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloy steel
Assignee: Armco Inc
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Filing: 1947-08-14
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Granted: 1950-11-07
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Expires: 1967-08-14
Abstract
No abstract record available.
Inventors
- 👤 Jr William Charles Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:46
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
HEAT-HARDENED STAINLESS STEEL CHARACTERIZED BY RESISTANCE TO CREEP AND STRESS RUPTURE, THE STEEL BEING OF AUSTENITIC CHROMIUM-NICKEL GRADE FREE OF AMOUNTS OF FERRITE BEYOND ABOUT 2% BY VOLUME, AND CONTAINING, IN ADDITION TO ABOUT 16% TO 26% CHROMIUM AND 6% TO 30% NICKEL, ABOUT 0.05% TO 0.5% PHOSPHORUS, AND THE REMAINDER SUBSTANTIALLY ALL IRON, AND SAID STEEL HAVING A FINELY DIVIDED PRECIPITATE IN THE MATRIX FOR SLIP INTERFERENCE AT HIGH TEMPERATURES PRODUCED BY ANNEALING AT 2000*F. TO 2250*F. AND QUENCHING FOLLOWED BY PRECIPITATION-HARDENING FROM 1200* F. TO 1500*F.
Claim 2
Dependent Claim
88 words
HEAT-HARDENED STAINLESS STEEL CHARACTERIZED BY RESISTANCE TO CREEP AND STRESS RUPTURE, THE STEEL BEING OF AUSTENITIC CHROMIUM-NICKEL GRADE FREE OF AMOUNTS OF FERRITE BEYOND ABOUT 2% BY VOLUME, AND CONTAINING, IN ADDITION TO ABOUT 16% TO 26% CHROMIUM AND 6% TO 30% NICKEL, ABOUT 0.05% TO 0.5% PHOSPHORUS, AND THE REMAINDER SUBSTANTIALLY ALL IRON, AND SAID STEEL HAVING A FINELY DIVIDED PRECIPITATE IN THE MATRIX FOR SLIP INTERFERENCE AT HIGH TEMPERATURES PRODUCED BY ANNEALING AT 2000*F. TO 2250*F. AND QUENCHING FOLLOWED BY PRECIPITATION-HARDENING FROM 1200* F. TO 1500*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) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |