US2673166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium steel, process, and articles
Assignee: Armco Inc
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Filing: 1948-11-04
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Granted: 1954-03-23
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Expires: 1968-11-04
Abstract
No abstract record available.
Inventors
- 👤 Maurice E Carruthers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:25
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR TREATING A SCALE RESISTANT, FERRITIC, NON-TRANSFORMING CHROMIUM STEEL CONTAINING SUBSTANTIALLY 20% TO 35% CHROMIUM, TO RENDER IT AMENABLE TO SEVERE COLD-FORMING OPERATIONS WHICH COMPRISES, AFTER HOT ROLLING, FIRST GIVING SAID STEEL A PRELIMINARY HEAT TREATMENT AT 1800 TO 2100* F. FOR TWO TO SIXTY MINUTES AND ALLOWING THE STEEL TO COOL, AND THEN HEATING SAID STEEL AT 1450 TO 1650* F. AND ALLOWING IT TO COOL RAPIDLY THROUGH THE RANGE BETWEEN 1100* F. AND 700* F.
Claim 2
Dependent Claim
79 words
A PROCESS FOR TREATING A SCALE RESISTANT, FERRITIC, NON-TRANSFORMING CHROMIUM STEEL CONTAINING SUBSTANTIALLY 20% TO 35% CHROMIUM, TO RENDER IT AMENABLE TO SEVERE COLD-FORMING OPERATIONS WHICH COMPRISES, AFTER HOT ROLLING, FIRST GIVING SAID STEEL A PRELIMINARY HEAT TREATMENT AT 1800 TO 2100* F. FOR TWO TO SIXTY MINUTES AND ALLOWING THE STEEL TO COOL, AND THEN HEATING SAID STEEL AT 1450 TO 1650* F. AND ALLOWING IT TO COOL RAPIDLY THROUGH THE RANGE BETWEEN 1100* F. AND 700* 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) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |