Patent US5502489A successfully refreshed from Google Patents.
Patent US4996115A successfully refreshed from Google Patents.
US4996115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite structure
Assignee: Vale Canada Ltd
•
Filing: 1990-04-02
•
Granted: 1991-02-26
•
Expires: 2010-04-02
Abstract
Abstract A composite structure and a method of producing said composite structure from a combination of copper and a low coefficient of thermal expansion nickel-iron alloy is disclosed wherein the copper clads the nickel-iron sheet and is interposed through the central nickel-iron sheet in such a fashion as to provide a substantially isotropic heat transfer path.
Inventors
- 👤 Thijs Eerkes
- 👤 Carlos M. Diaz
- 👤 James A. E. Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:23
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; B; B32; B32B; B32B15/00; B32B15/01; B32B15/013; B32B15/015; B32B37/00; B32B37/06; H10; H10W; H10W40/00; H10W40/20; H10W40/25; H10W40/257; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/931; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/12917; Y10T428/24; Y10T428/24174
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
212 words
A composite structure having a linear thermal coefficient of expansion of about 5 to 12 ppm/°C. and comprising a thin metallic body extended in at least one of width or length comprising two outer layers of metal of high electrical and heat conductivity sandwiching a thin, coextensive inner layer of low coefficient of thermal expansion metal, said inner layer having a multiplicity of essentially uniformly distributed paths of said metal of high electrical and heat conductivity extending therethrough and connected to and integral with said two outer layers of said metal of high electrical and heat conductivity, said composite structure being so constructed and arranged that (A) the paths of said metal of high electrical and heat conductivity through said inner layer comprise about 15 to 40 volume percent of said inner layer; (B) the thicknesses of said outer layers of said metal of high electrical and heat conductivity (K) being controlled to provide thermal and electrical conductivity along said length and breadth (x-y) of said composite related to said conductivities across the thickness of (z) said composite such that ##EQU4## (C) the overall volume fraction of said metal of high electrical and heat conductivity in said composite is such to provide a linear coefficient of thermal expansion within the aforesaid range,
Claim 2
Dependent Claim
212 words
A composite structure having a linear thermal coefficient of expansion of about 5 to 12 ppm/°C. and comprising a thin metallic body extended in at least one of width or length comprising two outer layers of metal of high electrical and heat conductivity sandwiching a thin, coextensive inner layer of low coefficient of thermal expansion metal, said inner layer having a multiplicity of essentially uniformly distributed paths of said metal of high electrical and heat conductivity extending therethrough and connected to and integral with said two outer layers of said metal of high electrical and heat conductivity, said composite structure being so constructed and arranged that (A) the paths of said metal of high electrical and heat conductivity through said inner layer comprise about 15 to 40 volume percent of said inner layer; (B) the thicknesses of said outer layers of said metal of high electrical and heat conductivity (K) being controlled to provide thermal and electrical conductivity along said length and breadth (x-y) of said composite related to said conductivities across the thickness of (z) said composite such that ##EQU4## (C) the overall volume fraction of said metal of high electrical and heat conductivity in said composite is such to provide a linear coefficient of thermal expansion within the aforesaid range,
Claim 3
Dependent Claim
18 words
A composite structure as in claim 1 wherein said metal of high electrical and heat conductivity is copper.
Claim 4
Dependent Claim
23 words
A composite structure as in claim 2 in which copper paths in said inner layer comprise about 30 volume of said inner layer.
Claim 5
Dependent Claim
29 words
A composite structure as in claim 1 in which the metal of low coefficient of thermal expansion comprises an alloy having about 36 wt.% nickel and the balance iron.
References Cited (Backward Citations)
US3175893A
Cited
US3368122A
Cited
US3399332A
Cited
US3480842A
Cited
US4025997A
Cited
US4196442A
Cited
US4211354A
Cited
US4283464A
Cited
US4256792A
Cited
US4401728A
Cited
US4427993A
Cited
US4482912A
Cited
US4521801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |