US2658845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of aluminum alloys
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1950-04-07
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Granted: 1953-11-10
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Expires: 1970-04-07
Abstract
No abstract record available.
Inventors
- 👤 Lawrence J Barker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:18
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A METHOD OF PREPARING HEAT TREATABLE ALUMINUM ALLOY SURFACES FOR RECEPTION OF NONCHEMICALLY BONDED COATINGS, COMPRISING THE STEPS OF ARTIFICALLY UNDER-AGING THE NORMALLY SOLUTION HEAT TREATED ALLOYS BY HEATING AT A SELECTED TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 200* TO ABOUT 400* F. FOR A PREDETERMINED TIME WITHIN THE RANGE OF FROM ABOUT 1 TO ABOUT 20 HOURS, THE TIME VARYING SUBSTANTIALLY INVERSELY WITH THE AGING TEMPERATURE, DISCONTINUING SAID HEATING WHEN PRECIPITATION AND AGGLOMERATION OF THE SOLUBLE ALLOY CONSTITUENTS IS NON-UNIFORM AND
Claim 2
Independent Claim
83 words
A METHOD OF PREPARING HEAT TREATABLE ALUMINUM ALLOY SURFACES FOR RECEPTION OF NONCHEMICALLY BONDED COATINGS, COMPRISING THE STEPS OF ARTIFICALLY UNDER-AGING THE NORMALLY SOLUTION HEAT TREATED ALLOYS BY HEATING AT A SELECTED TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 200* TO ABOUT 400* F. FOR A PREDETERMINED TIME WITHIN THE RANGE OF FROM ABOUT 1 TO ABOUT 20 HOURS, THE TIME VARYING SUBSTANTIALLY INVERSELY WITH THE AGING TEMPERATURE, DISCONTINUING SAID HEATING WHEN PRECIPITATION AND AGGLOMERATION OF THE SOLUBLE ALLOY CONSTITUENTS IS NON-UNIFORM AND
References Cited (Backward Citations)
US1472739A
Cited
US2106178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |