Patent US3741827A successfully refreshed from Google Patents.
US3741827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Age hardening process and product
Assignee: Alcan Research and Development Ltd
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Filing: 1971-02-01
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Granted: 1973-06-26
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Expires: 1991-02-01
Abstract
Abstract AN ALUMINUM - ZINC-MAGNESIUM-COPPER ALOY INCLUDES 0.12-0.20% ZIRCONIUM AND 0.2-0.4% SILVER AND DEVELOPS HIGH STRENGTH AND GOOD STRESS CORROSION CHARACTERISTICS WHEN SUBJECTED TO SOLUTION HEAT TREATMENT AND QUENCHING, FOLLOWED BY ARTIFICIAL AGEING. IT IS AN ADVANTAGE OF THIS ALLOY THAT IT IS RELATIVELY INSENSITIVE TO THE RATE OF QUENCHING. PARTICULARLY SATISFACTORY PROPERTIES ARE DEVELOPED WHEN THE QUENCHED ALLOY IS HEATED TO AGEING TEMPERATURE AT A RATE NOT EXCEEDING 30* C./HOUR.
Inventors
- 👤 M Reynolds
- 👤 R Elkington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:02
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/10
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |