Patent US4122252A successfully refreshed from Google Patents.
Patent US3658601A successfully refreshed from Google Patents.
US3658601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of alloys
Assignee: SPRING RESEARCH ASS
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Filing: 1970-01-20
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Granted: 1972-04-25
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Expires: 1990-01-20
Abstract
Abstract A process for the treatment of a beryllium-copper alloy to reduce or eliminate the distortion which occurs on precipitation treatment is provided in which the alloy is quenched in a medium providing a heat transfer coefficient of 150-750 B.Th.U/ft2h*F, said quenching being below the normal precipitation treatment temperature of said alloy. The invention has utility in the production of an alloy which has little or no distortion on precipitation treatment as well as a predictable contraction.
Inventors
- 👤 John Britton
- 👤 Bernard Lawrence Daniell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:25
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
20 words
A process as claimed in claim 1 in which the quenching is effected at a temperature of from 150*-300* C.
Claim 2
Dependent Claim
15 words
A process as claimed in claim 1 in which the molten salt comprises a nitrate.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 3 in which the salt bath is a mixture of sodium nitrite and sodium and potassium nitrates having a melting point of 150* C.
Claim 4
Dependent Claim
43 words
A process as claimed in claim 4 wherein said alloy contains approximately 1.92 percent beryllium and is solution treated at about 790* C and is quenched in said bath at about 190* C for about 1 minute and then cooled to room temperature.
Claim 5
Dependent Claim
126 words
A process for producing a precipitation hardened beryllium-copper alloy containing from 1.5 to 2.2 percent beryllium by weight and up to about 0.5 percent cobalt and/or nickel, the balance being copper which comprises the steps of: (a) heating the beryllium-copper alloy to a temperature of approximately 800* C; (b) quenching said heated alloy by immersion in a molten salt quench bath at a temperature of 150*-300* C providing a heat transfer coefficient of 150-750 B.Th. U./ft2h*F until it has reached about the temperature of said bath; (c) allowing said metal alloy to cool to ambient temperature; (d) forming the alloy into a desired shape and (e) heating the alloy shape to a temperature of from 300* to 350* C for a period of approximately 2 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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |