Patent US4090890A successfully refreshed from Google Patents.
US4090890A
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Method for making copper-nickel-tin strip material
Assignee: AT&T Inc
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Filing: 1976-05-11
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Granted: 1978-05-23
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Expires: 1996-05-11
Abstract
Abstract A method is disclosed for making strip material of a copper-nickel-tin alloy by cold rolling a homogenized ingot by an amount corresponding to an area reduction of from 25% to 45% followed by aging at a temperature in the vicinity of 350 DEG C. Strip material made by the disclosed method exhibits not only high strength but also high and essentially isotropic formability.
Inventors
- 👤 John Travis Plewes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:12
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/06; C22F; C22F1/00; C22F1/08; C22F1/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A method of producing high strength Cu-Ni-Sn strip material from an alloy comprising a composition falling within the shaded area of FIG. 1 and containing not less than 4% Sn CHARACTERIZED IN THAT said ingot is processed by a sequence of steps which terminates in the sequential steps of (1) homogenizing, (2) cold rolling by an amount corresponding to an area reduction of from 25% to 45%, and (3) aging at a temperature in the range of from 250° C to 450° C whereby essentially isotropic formability is obtained.
Claim 2
Independent Claim
89 words
A method of producing high strength Cu-Ni-Sn strip material from an alloy comprising a composition falling within the shaded area of FIG. 1 and containing not less than 4% Sn CHARACTERIZED IN THAT said ingot is processed by a sequence of steps which terminates in the sequential steps of (1) homogenizing, (2) cold rolling by an amount corresponding to an area reduction of from 25% to 45%, and (3) aging at a temperature in the range of from 250° C to 450° C whereby essentially isotropic formability is obtained.
Claim 3
Dependent Claim
20 words
Method of claim 1 in which said alloy is aged for a time of from 20 seconds to 30 hours.
Claim 4
Dependent Claim
20 words
Method of claim 1 in which said homogenized ingot has an average grain size not in excess of 100 microns.
Claim 5
Dependent Claim
20 words
Method of claim 3 in which said homogenized ingot has an average grain size in the vicinity of 10 microns.
Claim 6
Dependent Claim
93 words
Method of claim 1 in which said alloy contains, as a substitute for a corresponding amount of Cu, at least one element selected from the group consisting of: Fe in an amount of up to 10%, Zn in an amount of up to 7%, Mn in an amount of up to 10%, Zr in an amount of up to 0.15%, Nb in an amount of up to 0.3%, Cr in an amount of up to 1%, Al in an amount of up to 1.5%, or Mg in an amount of up to 1%.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |