US3748197A
Expired / Lapsed
US
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Method for stabilizing and employing temperature sensitive material exhibiting martensitic transistions
Assignee: Robertshaw Controls Co
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Filing: 1971-09-14
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Granted: 1973-07-24
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Expires: 1991-09-14
Abstract
Abstract A method for dimension stabilizing temperature sensitive materials exhibiting martensitic transitions for use in control and work performing devices. The method includes subjecting the martensitic-transition material to a greater unit stress than the material would be required to work against in its application to thereby stretch the material beyond its expected deflection, and subsequently completing a number of temperature cycles while the material is in such overstressed condition, through which it is heated to a point above its transition temperature and cooled back to its annealed temperature. After treatment the material operates through complete work cycles with no loss of dimension stability.
Inventors
- 👤 J Willson
- 👤 D Carey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:35
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/006; F; F03; F03G; F03G7/00; F03G7/06; F03G7/061; F03G7/0614; F03G7/06143; H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/323; H01H61/00; H01H61/01; H01H61/0107
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
The method as recited in claim 1 wherein said temperature-cycling includes at least three complete cycles.
Claim 2
Dependent Claim
29 words
The method as recited in claim 2 wherein said member is formed of material which comprises an alloy comprising 53.5-56.5 percent nickel by weight, the remainder being essentially titanium.
Claim 3
Dependent Claim
25 words
The method as recited in claim 2 wherein said material comprises an alloy comprising approximately 55 percent nickel by weight, the remainder being essentially titanium.
Claim 4
Dependent Claim
18 words
The method as recited in claim 1 wherein said member is heated by application of external heat thereto.
Claim 5
Dependent Claim
14 words
The method as recited in claim 5 wherein said external heat is radiant heat.
Claim 6
Dependent Claim
19 words
The method as recited in claim 1 wherein said member is internally heated by passing an electrical current therethrough.
References Cited (Backward Citations)
US3594239A
Cited
US3558369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |