US3290187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgy
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1964-06-01
•
Granted: 1966-12-06
•
Expires: 1984-06-01
Abstract
No abstract record available.
Inventors
- 👤 Dorsey A Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:14
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
IN A METHOD OF TREATING AN ALUMINUM ALLOY CONSISTING ESSENTIALLY OF NOT MORE THAN 0.30% SILICON AND 0.40% IRON, FROM 0.40 TO 0.8% COPPER, FROM 0.10 TO 0.30% MANGANESE, FROM 2.9 TO 3.7% MAGNESIUM, FROM 0.10 TO 0.25% CHROMIUM, FROM 3.8 TO 4.8% ZINC, AND NOT MORE THAN 0.10% TITANIUM, BALANCE ALUMINUM, WHEREIN SAID METHOD COMPRISES THE STEPS OF SOLUTION HEAT TREATING AND QUENCHING A BODY OF SAID ALUMINUM ALLOY, PRE-AGING SAID BODY AND FINALLY AGING SAID BODY BY HEATING TO A TEMPERATURE OF FROM ABOUT 235 TO 250*F. AND MAINTAINING SAID BODY AT SAID TEMPERATURE FOR A PERIOD OF FROM ABOUT 35 TO 60 HOURS, THE IMPROVEMENT WHEREIN SAID PRE-AGING IS ACCOMPLISHED BY HEATING SAID BODY TO A TEMPERATURE OF FROM ABOUT 115 TO 125*F. AND MAINTAINING SAID BODY AT SAID TEMPERATURE FOR A PERIOD OF FROM ABOUT 4 TO 8 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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |