US3231435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of eliminating stress corrosion cracking in copper-magnesium-zinc series aluminum alloys
Assignee: INTERNATIONAL LIGHT METALS Corp
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Filing: 1964-11-25
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Granted: 1966-01-25
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Expires: 1984-11-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Wayne C Rotsell
- 👤 Estates Palos Verdes
- 👤 James R Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:22
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/10; C22F; C22F1/00; C22F1/04; C22F1/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR HEAT TREATING A HIGH STRENGTH ALUMINUM BASE ALLOY OF THE COPPER-MAGNESIUM-ZINC SERIES WHEREBY THE ALLOY IS RENDERED SUBSTANTIALLY NONSUSCEPTIBLE TO STRESS CORROSION CRACKING WHILE RETAINING ITS HIGH STRENGTH PROPERTIES, THE PROCESS INCLUDING: HEATING THE ALLOY AT A TEMPERATURE OF BETWEEN 860*F. AND 890*F. FOR A TIME SUFFICIENT TO ALLOY CONSTITUENTS OF THE ALLOY TO ENTER INTO SOLID SOLUTION; WATER QUENCHING THE ALLOY; AGING THE ALLOY BY HEATING TO A TEMPERATURE OF BETWEEN 205*F. AND 225*F. FOR SIX TO TEN HOURS; AND THEREAFTER HEATING THE ALLOY TO A TEMPERATURE OF BETWEEN 300*F. AND 380*F. FOR TWO TO FORTY-EIGHT HOURS.
Claim 2
Dependent Claim
101 words
A PROCESS FOR HEAT TREATING A HIGH STRENGTH ALUMINUM BASE ALLOY OF THE COPPER-MAGNESIUM-ZINC SERIES WHEREBY THE ALLOY IS RENDERED SUBSTANTIALLY NONSUSCEPTIBLE TO STRESS CORROSION CRACKING WHILE RETAINING ITS HIGH STRENGTH PROPERTIES, THE PROCESS INCLUDING: HEATING THE ALLOY AT A TEMPERATURE OF BETWEEN 860*F. AND 890*F. FOR A TIME SUFFICIENT TO ALLOY CONSTITUENTS OF THE ALLOY TO ENTER INTO SOLID SOLUTION; WATER QUENCHING THE ALLOY; AGING THE ALLOY BY HEATING TO A TEMPERATURE OF BETWEEN 205*F. AND 225*F. FOR SIX TO TEN HOURS; AND THEREAFTER HEATING THE ALLOY TO A TEMPERATURE OF BETWEEN 300*F. AND 380*F. FOR TWO TO FORTY-EIGHT HOURS.
References Cited (Backward Citations)
GB544439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |