US3708352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strain hardened aluminum-magnesium alloys
Assignee: Alcoa Corp
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Filing: 1971-06-14
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Granted: 1973-01-02
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Expires: 1991-06-14
Abstract
Abstract ALUMINUM ALLOY PLATE CONTAINING 4.4 TO 10% MAGNESIUM AND STRAIN HARDENED TO IMPROVE ITS STRENGTH TO A LEVEL OF AT LEAST 40% GREATER THAN THE STRENGTH IN THE ANNEALED STATE IS IMPARTED WITH SUBSTANTIALLY FREEDOM FROM SUSCEPTIBILITY OF EXFOLIATION CORROSION. THE PROCESS INCLUDES ROLLING AT MINIMUM TEMPERATURES OF ABOUT 420* TO 650*F. DEPENDING ON THE AMOUNT OF MAGNESIUM PRESENT, TO PRODUCE THE STRAIN HARDENED PRODUCT AND COOLING AT SPECIALLY CONTROLLED RATES.
Inventors
- 👤 M Shumaker
- 👤 R Brown
- 👤 M Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:19
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/06; C22F; C22F1/00; C22F1/04; C22F1/047
Claims Analysis
Total Claims: 0
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |