Patent US6376318B1 successfully refreshed from Google Patents.
Patent US3305410A successfully refreshed from Google Patents.
US3305410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of aluminum
Assignee: Reynolds Metals Co
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Filing: 1964-04-24
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Granted: 1967-02-21
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Expires: 1984-04-24
Abstract
No abstract record available.
Inventors
- 👤 Sublett George Robert
- 👤 Fien Michael Waldemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:25
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04; C22F1/053; C22C; C22C21/00; C22C21/10; C22F1/057
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD OF TREATING A COPPER-BEARING ALUMINUM BASE ALLOY SO AS TO REDUCE ITS TENDENCY TOWARD THE DEVELOPMENT OF INTERGRANULAR CORROSION IN THE AGED CONDITION, COMPRISING THE STEPS OF PROVIDING THE ALLOY IN SOLUTION HEAT TREATED CONDITION, SUBSTANTIALLY AT ROOM TEMPERATURE, HEATING THE SOLUTION TREATED ALLOY TO AN AGING TEMPERATURE OF ABOUT 400*F., MAINTAINING SAID TEMPERATURE FOR ABOUT 3 HOURS, COOLING THE ALLOY TO A LOWER TEMPERATURE OF ABOUT 300*F., AND AGING THE ALLOY AT SAID LOWER TEMPERATURE FOR ABOUT 10 HOURS.
Claim 2
Independent Claim
82 words
THE METHOD OF TREATING A COPPER-BEARING ALUMINUM BASE ALLOY SO AS TO REDUCE ITS TENDENCY TOWARD THE DEVELOPMENT OF INTERGRANULAR CORROSION IN THE AGED CONDITION, COMPRISING THE STEPS OF PROVIDING THE ALLOY IN SOLUTION HEAT TREATED CONDITION, SUBSTANTIALLY AT ROOM TEMPERATURE, HEATING THE SOLUTION TREATED ALLOY TO AN AGING TEMPERATURE OF ABOUT 400*F., MAINTAINING SAID TEMPERATURE FOR ABOUT 3 HOURS, COOLING THE ALLOY TO A LOWER TEMPERATURE OF ABOUT 300*F., AND AGING THE ALLOY AT SAID LOWER TEMPERATURE FOR ABOUT 10 HOURS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |