US2597979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recrystallizing deep-drawing steel
Assignee: United States Steel Corp
•
Filing: 1949-12-21
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Granted: 1952-05-27
•
Expires: 1969-12-21
Abstract
No abstract record available.
Inventors
- 👤 Falih N Darmara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:25
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/0447; C21D8/0473
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A METHOD OF PRODUCING AN ELONGATED GRAIN STRUCTURE IN ALUMINUM-KILLED DEEP-DRAWING STEEL COMPRISING COLD-REDUCING THE STEEL AT LEAST 35% IN THICKNESS, CONDITIONING SAID STEEL AT A TEMPERATURE BETWEEN 1000 AND 1100* F. FOR AT LEAST 10 MINUTES AND THEN CONTINUOUSLY ANNEALING IT AT A TEMPERATURE ABOVE ITS RECYSTALLIZING TEMPERATURE.
Claim 2
Independent Claim
49 words
A METHOD OF PRODUCING AN ELONGATED GRAIN STRUCTURE IN ALUMINUM-KILLED DEEP-DRAWING STEEL COMPRISING COLD-REDUCING THE STEEL AT LEAST 35% IN THICKNESS, CONDITIONING SAID STEEL AT A TEMPERATURE BETWEEN 1000 AND 1100* F. FOR AT LEAST 10 MINUTES AND THEN CONTINUOUSLY ANNEALING IT AT A TEMPERATURE ABOVE ITS RECYSTALLIZING TEMPERATURE.
References Cited (Backward Citations)
US1581269A
Cited
US2381435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |