Patent US3663311A successfully refreshed from Google Patents.
US3663311A
Expired / Lapsed
US
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Processing of copper alloys
Assignee: AT&T Inc
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Filing: 1969-05-21
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Granted: 1972-05-16
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Expires: 1989-05-21
Abstract
Abstract Phosphor-bronze, nickel-silver, beryllium-copper, and cupronickel alloys, when cold worked to an area reduction of at least 65 percent, and given a critical partial terminal anneal, exhibit higher yield strengths for given amounts of formability than have heretofore been attained.
Inventors
- 👤 Gilbert Y Chin
- 👤 Robert R Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:14
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
The method of claim 1 in which the cold working is carried out to an area reduction of at least 95 per cent.
Claim 2
Dependent Claim
21 words
The method of claim 1 in which the copper alloy comprises in weight per cent 0.5 to 2.05 beryllium, remainder copper.
Claim 3
Independent Claim
85 words
A method for processing copper alloys selected from the group consisting of nickel silver alloys comprising one or more processing steps, characterized in that said steps conclude with: cold working the alloys to an area reduction of at least 95 per cent, said cold working consisting of one or more cold reduction steps, followed by a partial terminal anneal at a temperature of from 100* to 1,000* F., for a time of from 20 hours to 1 second, the higher temperatures corresponding to shorter times.
Claim 4
Dependent Claim
28 words
The method of claim 4 in which the copper alloy comprises in weight per cent 9 to 33 nickel, 5 to 30 zinc and 53 to 75 copper.
Claim 5
Dependent Claim
27 words
The method of claim 5 in which the copper alloy is annealed at a temperature of from about 225* to about 700* F. for about 2 hours.
References Cited (Backward Citations)
US2079239A
Cited
GB486600A
Cited
US2365208A
Cited
GB621224A
Cited
US2804408A
Cited
US3046166A
Cited
GB1032441A
Cited
US3403997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |