US4823863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal conduction device
Assignee: Hitachi Ltd
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Filing: 1987-03-20
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Granted: 1989-04-25
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Expires: 2007-03-20
Abstract
Abstract The present invention relates to a thermal conduction device well suited to cool electronic components such as semiconductor devices, in which a porous layer is provided at the surface part of the contact interface of a heat generating element or a heat sink element, and a liquid such as oil is contained in cavities formed in the porous layer, the heat generating element and the heat sink element being held in close contact by the surface tension of the liquid, whereby heat generated by the heat generating element is transferred to the heat sink element.
Inventors
- 👤 Tadakatsu Nakajima
- 👤 Wataru Nakayama
- 👤 Shigeo Oohashi
- 👤 Heikichi Kuwabara
- 👤 Takahiro Daikoku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:15
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/70; H10W40/77; H10W40/20; H10W40/25; H10W40/251; H10W40/257; H10W72/00; H10W72/071; H10W72/072; H10W72/07251; H10W72/20; H10W72/851; H10W72/874; H10W72/877; H10W90/00; H10W90/701; H10W90/721; H10W90/724; H10W90/731; H10W90/736; Y; Y10; Y10S; Y10S165/00; Y10S165/907
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A thermal conduction device comprising a heat generating element, a heat sink element which carries heat generated by said heat generating element, out of said device, notches which are formed in a surface of said heat sink element, a porous layer which is formed by sintering ultrafine grains and has microscopic cavities and which is provided on said notches of said surface of said heat sink element, and a liquid which is contained in said cavities, said heat generating element being held in close contact with said porous layer by a surface tension of said liquid.
Claim 2
Dependent Claim
96 words
A thermal conduction device comprising a heat generating element, a heat sink element which carries heat generated by said heat generating element, out of said device, notches which are formed in a surface of said heat sink element, a porous layer which is formed by sintering ultrafine grains and has microscopic cavities and which is provided on said notches of said surface of said heat sink element, and a liquid which is contained in said cavities, said heat generating element being held in close contact with said porous layer by a surface tension of said liquid.
Claim 3
Dependent Claim
31 words
A thermal conduction device according to claim 1, wherein said heat generating element is an integrated circuit chip which is packaged on a substrate through metal connections for establishing electrical connections.
Claim 4
Dependent Claim
42 words
A thermal conduction device according to claim 1, wherein said notches formed in said surface of said heat sink element are V-shaped, and said porous layer is filled with silicone oil so as to leave a vacant space in the notch portion.
Claim 5
Dependent Claim
121 words
A thermal conduction device comprising: a heat generating element; a heat sink element which carries heat generated by said heat generating element, out of said device, and which has notches formed in a surface arranged opposite to the heat generating element; a porous layer which is formed by sintering ultra fine grain and has microscopic cavities and which is provided between said heat generating element and said heat sink element; and a liquid within said cavities; wherein the porous layer is less than dense in a vicinity of the heat sink element than in a vicinity of the heat generating element; and said heat generating element is held in close contact with the porous layer by surface tension of said liquid.
Claim 6
Dependent Claim
121 words
A thermal conduction device comprising: a heat generating element; a heat sink element which carries heat generated by said heat generating element, out of said device, and which has notches formed in a surface arranged opposite to the heat generating element; a porous layer which is formed by sintering ultra fine grain and has microscopic cavities and which is provided between said heat generating element and said heat sink element; and a liquid within said cavities; wherein the porous layer is less than dense in a vicinity of the heat sink element than in a vicinity of the heat generating element; and said heat generating element is held in close contact with the porous layer by surface tension of said liquid.
Claim 7
Dependent Claim
31 words
A thermal conduction device according to claim 4, wherein said heat generating element is an integrated circuit chip which is packaged on a substrate through metal connections for establishing electrical connections.
Claim 8
Dependent Claim
42 words
A thermal conduction device according to claim 4, wherein said notches formed in said surface of said heat sink element are V-shaped, and said porous layer is filled with silicon oil so as to leave a vacant space in the notch portion.
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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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |