US2772992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing stainless steel
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1953-07-13
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Granted: 1956-12-04
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Expires: 1973-07-13
Abstract
No abstract record available.
Inventors
- 👤 George C Kiefer
- 👤 Joseph A Ferree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:13
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS OF PRODUCING CHROMIUM FERRITIC STAINLESS STEEL FOR DEEP DRAWING PURPOSES. SAID STEEL CONSISTING OF 15 TO 22% CHROMIUM, NOT MORE THAN .50% NICKEL, NOT MORE THAN 25% CARBON NOT MORE THAN 1.25% MANGANESE NOT MORE THAN 1% SILICON AND THE BALANCE SUBSTANTIALLY ALL IRON, INCLUDING AS STEPS AN INITIAL HOT ROLLING OF THE STEEL FOLLOWED BY AT LEAST ONE COLD ROLLING TREATMENT, WHICH PROCESS IS CHARACTERIZED BY STEP OF HEATING THE HOT ROLLED STEEL PRIOR TO COLD ROLLING TO DEVELOP A TEMPERATURE ABOVE ABOUT 1900* F. AND UP TO ABOUT 2150* F. THEREIN, SAID PROCESSED CHROMIUM STEEL HAVING THE CHARACTERISTIC OF BEING CAPABLE OF BEING DEEP DRAWN WITHOUT DEVELOPING ROPING.
Claim 2
Dependent Claim
112 words
A PROCESS OF PRODUCING CHROMIUM FERRITIC STAINLESS STEEL FOR DEEP DRAWING PURPOSES. SAID STEEL CONSISTING OF 15 TO 22% CHROMIUM, NOT MORE THAN .50% NICKEL, NOT MORE THAN 25% CARBON NOT MORE THAN 1.25% MANGANESE NOT MORE THAN 1% SILICON AND THE BALANCE SUBSTANTIALLY ALL IRON, INCLUDING AS STEPS AN INITIAL HOT ROLLING OF THE STEEL FOLLOWED BY AT LEAST ONE COLD ROLLING TREATMENT, WHICH PROCESS IS CHARACTERIZED BY STEP OF HEATING THE HOT ROLLED STEEL PRIOR TO COLD ROLLING TO DEVELOP A TEMPERATURE ABOVE ABOUT 1900* F. AND UP TO ABOUT 2150* F. THEREIN, SAID PROCESSED CHROMIUM STEEL HAVING THE CHARACTERISTIC OF BEING CAPABLE OF BEING DEEP DRAWN WITHOUT DEVELOPING ROPING.
References Cited (Backward Citations)
US2673166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |