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US4166739A
Expired / Lapsed
US
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Quarternary β-brass type alloys capable of being rendered heat recoverable
Assignee: Raychem Corp
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Filing: 1977-05-17
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Granted: 1979-09-04
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Expires: 1997-05-17
Abstract
Abstract Alloys comprising by weight 70-82% Copper, 6-10% Aluminum, 0.1-24% Zinc and 0.1-12% Manganese are particularly suited for use as the material of heat recoverable articles as they exhibit good ductility and stability and are easily worked by hot working techniques. Additionally, they have M s temperatures which enables them to be fabricated into heat recoverable articles useful in many applications. A heat recoverable article, made from a quarternary alloy of copper, aluminum, manganese and zinc whose composition falls on or near the eutectoid line, is particularly suited for use in circumstances where the article has been recovered from its recoverable state under conditions such that a degree of unresolved recovery remains.
Inventors
- 👤 Peter L. Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:45
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/01; C22F; C22F1/00; C22F1/006
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
58 words
An alloy having a β-brass type structure capable of being rendered heat recoverable and capable of being cooled from a temperature at which it exists in an austenitic state to a temperature at which it exists in a martensitic state comprising 70-82% by weight copper, 6-12% by weight aluminum, 0.1-12% by weight manganese and 0.1-24% by weight zinc.
Claim 2
Dependent Claim
58 words
An alloy having a β-brass type structure capable of being rendered heat recoverable and capable of being cooled from a temperature at which it exists in an austenitic state to a temperature at which it exists in a martensitic state comprising 70-82% by weight copper, 6-12% by weight aluminum, 0.1-12% by weight manganese and 0.1-24% by weight zinc.
Claim 3
Dependent Claim
10 words
An alloy according to claim 1 which is heat recoverable.
Claim 4
Dependent Claim
53 words
An alloy according to claim 2 that when deformed from an original configuration while in its martensitic state and caused to partially recover towards said original configuration upon being warmed to the temperature at which the alloy reverts to its austenitic state exhibits stress stability of at least 1,000 hours at 125° C.
Claim 5
Dependent Claim
10 words
An alloy according to claim 3 which is heat recoverable.
Claim 6
Dependent Claim
29 words
An alloy according to claim 1, the components of which are present in an amount that corresponds to that for a eutectoid composition of copper, aluminum, manganese and zinc.
Claim 7
Dependent Claim
10 words
An alloy according to claim 5 which is heat recoverable.
Claim 8
Dependent Claim
47 words
An alloy according to claim 1 wherein the manganese content of the alloy deviates from the manganese content of the eutectoid composition by not more than about 3% by weight on the gamma-rich side of the eutectoid, said eutectoid being that of copper, aluminum, manganese and zinc.
Claim 9
Dependent Claim
10 words
An alloy according to claim 7 which is heat recoverable.
Claim 10
Dependent Claim
33 words
An alloy according to claim 7 wherein the manganese content of the alloy deviates from that of the eutectoid composition by not more than 1% by weight on the gamma-rich side of eutectoid.
Claim 11
Dependent Claim
10 words
An alloy according to claim 9 which is heat recoverable.
Claim 12
Dependent Claim
47 words
An alloy according to claim 1 wherein the manganese content of the alloy deviates from the manganese content of the eutectoid composition by not more than about 3% by weight on the alpha-rich side of the eutectoid, said eutectoid being that of copper, aluminum, manganese and zinc.
Claim 13
Dependent Claim
10 words
An alloy according to claim 11 which is heat recoverable.
Claim 14
Dependent Claim
53 words
An alloy according to claim 1 that when deformed from an original configuration while in its martensitic state and caused to partially recover towards said original configuration upon being warmed to the temperature at which the alloy reverts to its austenitic state exhibits stress stability of at least 1,000 hours at 125° C.
Claim 15
Dependent Claim
10 words
An alloy according to claim 13 which is heat recoverable.
Claim 16
Dependent Claim
53 words
An alloy according to claim 5 that when deformed from an original configuration while in its martensitic state and caused to partially recover towards said original configuration upon being warmed to the temperature at which the alloy reverts to its austenitic state exhibits stress stability of at least 1,000 hours at 125° C.
Claim 17
Dependent Claim
10 words
An alloy according to claim 15 which is heat recoverable.
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) | 1982-09-03 | 1983-03-05 | 1983-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-03 | 1987-03-05 | 1987-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-03 | 1991-03-05 | 1991-09-04 | $7700.00 | Window Closed / Lapsed |