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US4565589A
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Nickel/titanium/copper shape memory alloy
Assignee: Memry Corp
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Filing: 1983-09-28
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Granted: 1986-01-21
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Expires: 2003-09-28
Abstract
Abstract Nickel/titanium alloys containing less than a stoichiometric quantity of titanium, which have a high austenitic yield strength and are capable of developing the property of shape memory at a temperature above 0° C., may be stabilized by the addition of from 7.5 to 14 atomic percent copper. These stabilized alloys also possess improved workability and machinability.
Inventors
- 👤 John D. Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:04
CPC Classifications
C; C22; C22C; C22C14/00; C22C30/00; C22C30/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A shape memory alloy consisting essentially of nickel, titanium, and copper within an area defined on a nickel, titanium, and copper ternary composition diagram by a quadrilateral with its first vertex at 42.5 atomic percent nickel, 50.0 atomic percent titanium, and 7.5 atomic percent copper; its second vertex at 36.0 atomic percent nickel, 50.0 atomic percent titanium, and 14.0 atomic percent copper; its third vertex at 41.5 atomic percent nickel, 44.5 atomic percent titanium, and 14.0 atomic percent copper, and its fourth vertex at 44.75 atomic percent nickel, 47.75 atomic percent titanium, and 7.5 atomic percent copper.
Claim 2
Dependent Claim
97 words
A shape memory alloy consisting essentially of nickel, titanium, and copper within an area defined on a nickel, titanium, and copper ternary composition diagram by a quadrilateral with its first vertex at 42.5 atomic percent nickel, 50.0 atomic percent titanium, and 7.5 atomic percent copper; its second vertex at 36.0 atomic percent nickel, 50.0 atomic percent titanium, and 14.0 atomic percent copper; its third vertex at 41.5 atomic percent nickel, 44.5 atomic percent titanium, and 14.0 atomic percent copper, and its fourth vertex at 44.75 atomic percent nickel, 47.75 atomic percent titanium, and 7.5 atomic percent copper.
Claim 3
Dependent Claim
34 words
A shape memory alloy according to claim 1 which consists essentially of from 41.0 to 42.0 atomic percent nickel, from 49.0 to 50.0 atomic percent titanium, and from 8.5 to 9.5 atomic percent copper.
Claim 4
Dependent Claim
115 words
A shape memory alloy consisting essentially of nickel, titanium, and copper, said alloy being prepared by the electron-beam melting of a charge consisting essentially of nickel, titanium, and copper within an area defined on a nickel, titanium, and copper ternary composition diagram by a quadrilateral with its first vertex at 42 atomic percent nickel, 49.5 atomic percent titanium, and 8.5 atomic percent copper; its second vertex at 35.5 atomic percent nickel, 49.5 atomic percent titanium, and 15 atomic percent copper; its third vertex at 41 atomic percent nickel, 44 atomic percent titanium, and 15 atomic percent copper, and its fourth vertex at 44.25 atomic percent nickel, 47.25 atomic percent titanium, and 8.5 atomic percent copper.
Claim 5
Dependent Claim
115 words
A shape memory alloy consisting essentially of nickel, titanium, and copper, said alloy being prepared by the electron-beam melting of a charge consisting essentially of nickel, titanium, and copper within an area defined on a nickel, titanium, and copper ternary composition diagram by a quadrilateral with its first vertex at 42 atomic percent nickel, 49.5 atomic percent titanium, and 8.5 atomic percent copper; its second vertex at 35.5 atomic percent nickel, 49.5 atomic percent titanium, and 15 atomic percent copper; its third vertex at 41 atomic percent nickel, 44 atomic percent titanium, and 15 atomic percent copper, and its fourth vertex at 44.25 atomic percent nickel, 47.25 atomic percent titanium, and 8.5 atomic percent copper.
Claim 6
Dependent Claim
37 words
A shape memory alloy according to claim 3 in which the charge consists essentially of from 40.5 to 41.5 atomic percent nickel, from 48.5 to 49.5 atomic percent titanium, and from 9.5 to 10.5 atomic percent copper.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |