US4878152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting for printed circuits forming a heat sink with controlled expansion
Assignee: Thales SA
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Filing: 1988-06-13
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Granted: 1989-10-31
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Expires: 2008-06-13
Abstract
Abstract A mounting that forms a heat sink for printed circuit boards comprising a graphite core oriented by compression to obtain very high lateral thermal conductivity and relatively low density is disclosed. This core is held by two outer skins made up of folds of carbon fibers embedded in an epoxy resin matrix. A metallic frame made of invar makes the mounting rigid, thus giving mountings that conduct heat very well while at the same time being light.
Inventors
- 👤 Jean-Denis Sauzade
- 👤 Manuel L'Hote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:35
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/20; H05K7/2039; H05K7/205; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/056; H05K3/00; H05K3/46; H05K3/4611; H05K3/4641; H05K2201/00; H05K2201/03; H05K2201/032; H05K2201/0323; H05K2201/20; H05K2201/2009; H05K2201/2018; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24942; Y10T428/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A mounting for printed circuits, said mounting forming a heat sink having low heat expansion characteristics, comprising: (i) a central graphite layer made of compressed graphite sheets having a lateral thermal conductivity greater than 200 W/m.°C. and a density lower than 1.4; said sheets consisting essentially of particles highly oriented in the plane of each sheet; and (ii) two outer layers, each made of carbon fibers bound together by a resin matrix, said outer layers displaying a high Young'modulus and sandwiching the central graphite layer.
Claim 2
Dependent Claim
85 words
A mounting for printed circuits, said mounting forming a heat sink having low heat expansion characteristics, comprising: (i) a central graphite layer made of compressed graphite sheets having a lateral thermal conductivity greater than 200 W/m.°C. and a density lower than 1.4; said sheets consisting essentially of particles highly oriented in the plane of each sheet; and (ii) two outer layers, each made of carbon fibers bound together by a resin matrix, said outer layers displaying a high Young'modulus and sandwiching the central graphite layer.
Claim 3
Dependent Claim
33 words
A mounting according to claim 1, further comprising a metallic frame that surrounds the central layer to make the mounting rigid, said frame being made of an alloy with a low expansion coefficient.
Claim 4
Dependent Claim
24 words
A mounting according to claim 2, wherein the outer layers are made up of several folds of parallel fibers, said folds intersecting each other.
Claim 5
Dependent Claim
31 words
A mounting according to claim 3, wherein said folds are so placed that said fibers are oriented successively at 0° and at 90° with respect to the edges of the mounting.
Claim 6
Dependent Claim
31 words
A mounting according to claim 3, wherein said folds are so placed that said fibers are oriented successively at -45° and at +45° with respect to the edges of said mounting.
Claim 7
Dependent Claim
24 words
A mounting according to claim 1, wherein the fibers forming the outer layers are coated with a heat-conducting material such as copper or nickel.
References Cited (Backward Citations)
GB1114066A
Cited
FR2207401A1
Cited
US3952231A
Cited
US4495378A
Cited
US4318954A
Cited
US4689110A
Cited
EP0197817A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |