US3788902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the elongation of grain refined copper base alloys
Assignee: Olin Corp
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Filing: 1972-11-24
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Granted: 1974-01-29
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Expires: 1992-11-24
Abstract
Abstract A PROCESS FOR IMPROVING THE ELONGATION OF COPPER BASE ALLOYS BY CONTROLLED GRAIN COARSENING. COPPER BASE ALLOYS CONTAINING FROM ABOUT 2 TO ABOUT 9.5% ALUMINUM, LESS THAN 1% ZINC,AND A GRAIN REFINING ELEMENT SUCH AS IRON, CHROMIUM, ZIRCONIUM, OR COBALT ARE SUBJECTED TO FINAL COLD REDUCTION OF FROM ABOUT 8% TO ABOUT 22% AND A FINAL ANNEAL OF FROM ABOUT 550 TO ABOUT 715* C. ALTERNATIVELY, THE ALLOY CAN BE SUBJECTED TO A SEQUENCE OF DECREASING REDUCTIONS INTERSPREAD WITH HIGH TEMPERATURE ANNEALS, FOLLOWED BY THE ABOVE FINAL REDUCTION AND ANNEAL.
Inventors
- 👤 E Shapiro
- 👤 J Crane
- 👤 G Eichelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:58
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |