US4518444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material which is at least partially made from a constituent having a one-way shape memory effect and process to produce said material
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1982-07-27
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Granted: 1985-05-21
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Expires: 2002-07-27
Abstract
Abstract Material, in the form of bars, tubes, profiles, wires, sheets, or bands, which is, at least partially, composed of a constituent showing a one-way shape memory effect, and a further inactive constituent hindering the one-way effect of the first, and which collectively exhibits a significant two-way effect. The one-way shape memory constituent can be a Cu-Al-Ni, Cu-Al, TiV, Ti-Nb, Ni-Ti, or Ni-Ti-Cu alloy. Production of bi- or multi-constituent components by brazing, welding, roll bonding, extruding, powder metallurgical methods, hot isostatic pressing, or gluing, or by the application of metallic coatings (2) onto a core material (1) and subsequent diffusion treatment to produce an inactive surface layer (3).
Inventors
- 👤 Joachim Albrecht
- 👤 Thomas Duerig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/006; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12493; Y10T428/125; Y10T428/12507; Y10T428/12514; Y10T428/12535; Y10T428/12556; Y10T428/12562; Y10T428/12569
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
82 words
An article exhibiting a two-way shape memory effect, which is comprised of a one-way shape memory constituent having at least two regions, wherein said constituent is caused to exhibit a two-way shape memory effect by the presence of a second constituent which induces stresses resisting said one-way memory effect in at least one of said two regions, said second constituent being caused to be present in said article by at least one of brazing, welding, roll bonding, extrusion or hot isostatic pressing.
Claim 2
Dependent Claim
82 words
An article exhibiting a two-way shape memory effect, which is comprised of a one-way shape memory constituent having at least two regions, wherein said constituent is caused to exhibit a two-way shape memory effect by the presence of a second constituent which induces stresses resisting said one-way memory effect in at least one of said two regions, said second constituent being caused to be present in said article by at least one of brazing, welding, roll bonding, extrusion or hot isostatic pressing.
Claim 3
Dependent Claim
27 words
Article according to claim 1 in the form of bars, wires, profiles, sheets, or bands which can be machined into components at least in the cold condition.
Claim 4
Dependent Claim
23 words
Article according to claim 1 in which the shape memory constituent consists of a Cu-Al-Ni, Cu-Al, Cu-Zn-Al, Ti-V, Ti-Nb, Ni-Ti, or Ni-Ti-Cu alloy.
Claim 5
Dependent Claim
44 words
Article according to claim 1 in which the regions consist of the same type of alloy, but with a difference in chemical composition and different memory properties, constructed so that at least one region suppresses the one-way effect of the other region or regions.
Claim 6
Dependent Claim
48 words
A process for producing an article, exhibiting a two-way shape memory effect comprising bonding a constituent having a one-way shape memory effect with at least one other constituent exhibiting a high elasticity said bonding comprising at least one of brazing, welding, roll bonding, extruding or hot isostatic pressing.
Claim 7
Dependent Claim
48 words
A process for producing an article, exhibiting a two-way shape memory effect comprising bonding a constituent having a one-way shape memory effect with at least one other constituent exhibiting a high elasticity said bonding comprising at least one of brazing, welding, roll bonding, extruding or hot isostatic pressing.
Claim 8
Dependent Claim
31 words
Process according to claim 5 whereby a two-component article in the form of a bimetal is produced by joining a constituent showing a one-way shape memory effect with some other constituent.
Claim 9
Dependent Claim
31 words
Process according to claim 5 whereby a three-component article in the form of a trimetal is produced by joining a constituent showing a one-way shape memory effect to two other constituents.
Claim 10
Dependent Claim
41 words
Process according to claim 5 further comprising bonding one or two layers of a highly elastic, high strength polymer constituent, which, in itself, can be composed of various constituents, to said one-way shape memory constituent to form a multiple constituent article.
Claim 11
Dependent Claim
57 words
Process according to claim 5 whereby the constituent showing a one-way shape memory effect is used as a core material (1), the surface of which is metallurgically modified by diffusion thereinto of a second constituent so that a surface layer acting as the other constituent (3) (with different physical properties than that of the core) is formed.
Claim 12
Dependent Claim
23 words
Process according to claim 9, whereby the surface layer (3) is formed by applying a metallic coating (2) followed by a diffusion treatment.
Claim 13
Dependent Claim
51 words
Process according to claim 10, whereby the constituent used as a core material (1) is a Cu-Al-Ni or Cu-Al alloy and the surface zone (3) is produced by the application of a galvanic coating (2) of nickel with a subsequent diffusion treatment at a temperature of 900° C. for 30 minutes.
Claim 14
Dependent Claim
24 words
Process according to claim 5 whereby the material is powder metallurgically produced from the individual components and machined into bimetal or trimetal, semifinished products.
Claim 15
Dependent Claim
41 words
Process according to claim 12 whereby the article is produced by cold consolidation of mixed powders of said constituents, sintering, and extruding, or by hot isostatic pressing of the mixed powders of said constituents, resulting in the formation of said regions.
Claim 16
Dependent Claim
26 words
Process according to claim 5 whereby the article is coated with a corrosion protection layer of 5 to 100 micron thickness during or after its manufacture.
Claim 17
Dependent Claim
19 words
The process according to claim 13, wherein said hot isostatic pressing is followed by swaging of the mixed powders.
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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) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |