Patent US3741819A successfully refreshed from Google Patents.
US3741819A
Expired / Lapsed
US
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Method of preparing low density wrought zinc alloy with improved strength and low temperature ductility
Assignee: NORANDA METAL IND Ltd
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Filing: 1971-01-20
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Granted: 1973-06-26
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Expires: 1991-01-20
Abstract
Abstract A METHOD OF HEAT TREATING A WROUGHT ALLOY CONSISTING ESSENTIALLY OF 18-30% ALUMINUM, UP TO 3% COPPER, UP TO 0.10% MAGNESIUM, UP TO 0.10% LITHIUM AND THE BALANCE ZINC APART FROM INCIDENTAL IMPURITIES, WHICH COMPRISES SLOW COOLING SAID ALLOY FROM BETWEEN ABOUT 380* C. AND ABOUT 290* C.
Inventors
- 👤 P Chollet
- 👤 E Gervais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:44
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/165; C22C; C22C18/00; C22C18/04
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 |