US2976192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the quality of copper-zirconium alloy castings
Assignee: Cyprus Amax Minerals Co
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Filing: 1959-07-01
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Granted: 1961-03-21
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Expires: 1979-07-01
Abstract
No abstract record available.
Inventors
- 👤 Matti J Saarivirta
- 👤 Jr Archibald A K Booth
- 👤 John J Burgmeister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:41
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
THE PROCESS FOR MAKING SOUND CASTINGS OF THE PRECIPITATION HARDENABLE ALLOY MADE WITH INITALLY OXYTEN-FREE COPPER CONTAINING WITHIN THE MAXIMUM SOLID SOLUBILITY LIMIT OF ZIRCONIUM, COMPRISING THE STEPS OF CASTING THE MOLTEN ALLOY UNDER A PROTECTIVE ATOMSPHERE, HOMOGENIZING THE CAST SOLIDFIED ALLOY FRO AT LEAST 10 MINUTES AT A TEMPERATURE ABOVE THE SOLVUS LINE IN THE PHASE DIAGRAM OF FIGURE 1 OF THE ACCOMPANYING DRAWING FOR ANY PARTICULAR ZIRCONIUM CONTENT AND THEREAFTER SLOW COOLING THE SUBSTANTIALLY COMPLETELY HOMOGENIZED CASTING FROM A TEMPERATURE OF AT LEAST 850*C. SUCH THAT A PROGRESSIVE COOLING THEREOF DOWN TO 400 TO 300*C. REQUIRES A MINIMUM PERIOD OF AT LEAST TWO AND ONE-HALF HOURS.
References Cited (Backward Citations)
US2798826A
Cited
US2842438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |