Patent US5869891A successfully refreshed from Google Patents.
US5869891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdered metal heat sink with increased surface area
Assignee: LSI Corp
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Filing: 1997-05-12
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Granted: 1999-02-09
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Expires: 2017-05-12
Abstract
Abstract A method and apparatus for dissipating heat from a semiconductor device. A heat sink embodying the method includes an exterior surface contoured to better facilitate heat dissipation and/or direct a flow of air or fluid over the heat sink. In one embodiment, the heat sink includes a heat sink layer formed from a powdered metal. In another embodiment, the heat sink layer is contoured with a selected combination of bumps, indentations and holes. In yet another embodiment, the heat sink includes a stack of such heat sink layers which are mechanical; interfitted and thermally coupled.
Inventors
- 👤 Michael D. Rostoker
- 👤 Mark Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:18
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/20; H10W40/22; H10W70/00; H10W70/01; H10W70/02; H10W70/027
Claims Analysis
Total Claims: 59
Claim 1
Independent Claim
120 words
A heat sink assembly, comprising: a heat sink body attachable relative to an electronic component to absorb heat therefrom; first and second heat sink fins extending out from said heat sink body to radiate absorbed heat in said heat sink body away from the electronic component; said first and second heat sink fins being parallel to and spaced from one another in a manner that defines a continuous uninterrupted cooling air layer around said heat sink body and extends from said heat sink body to the outer edges of said fins and in between said first and second fins; and said first fin includes a hole, spaced radially out from said heat sink body, to increase heat radiation out therefrom.
Claim 2
Dependent Claim
120 words
A heat sink assembly, comprising: a heat sink body attachable relative to an electronic component to absorb heat therefrom; first and second heat sink fins extending out from said heat sink body to radiate absorbed heat in said heat sink body away from the electronic component; said first and second heat sink fins being parallel to and spaced from one another in a manner that defines a continuous uninterrupted cooling air layer around said heat sink body and extends from said heat sink body to the outer edges of said fins and in between said first and second fins; and said first fin includes a hole, spaced radially out from said heat sink body, to increase heat radiation out therefrom.
Claim 3
Dependent Claim
18 words
The heat sink assembly of claim 1 wherein said first and second fins are each substantially flat discs.
Claim 4
Dependent Claim
29 words
The heat sink assembly of claim 2 wherein said hole contacts and communicates directly with ambient air to radiate heat from said heat sink body to the ambient air.
Claim 5
Dependent Claim
29 words
The heat sink assembly of claim 1 wherein said hole contacts and communicates directly with ambient air to radiate heat from said heat sink body to the ambient air.
Claim 6
Dependent Claim
25 words
The heat sink assembly of claim 1 wherein said hole extends completely through said first fin from an upper surface to a lower surface thereof.
Claim 7
Dependent Claim
20 words
The heat sink assembly of claim 1 wherein said hole defines a groove on a surface of said first fin.
Claim 8
Dependent Claim
18 words
The heat sink assembly of claim 6 wherein the surface is a top surface of said first fin.
Claim 9
Dependent Claim
23 words
The heat sink assembly of claim 6 wherein said groove defines a continuous annular shape about a longitudinal axis of said first fin.
Claim 10
Dependent Claim
20 words
The heat sink assembly of claim 1 wherein said hole forms a depression on a surface of said first fin.
Claim 11
Dependent Claim
18 words
The heat sink assembly of claim 9 wherein the surface is a top surface of said first fin.
Claim 12
Dependent Claim
39 words
The heat sink assembly of claim 1 wherein a first part of said heat sink body is integrally formed with said first fin, and a second part of said heat sink body is integrally formed with said second fin.
Claim 13
Dependent Claim
20 words
The heat sink assembly of claim 11 wherein said first and second parts are attached together using a button-recess arrangement.
Claim 14
Dependent Claim
27 words
The heat sink assembly of claim 12 wherein at least one of said first and second parts defines a shoulder spacing said first and second fins apart.
Claim 15
Dependent Claim
17 words
The heat sink assembly of claim 12 wherein said first and second parts are sinter fused together.
Claim 16
Dependent Claim
32 words
The heat sink assembly of claim 1 wherein said first fin has substantially flat top and bottom surfaces, and said hole defines an air channel spanning between said top and bottom surfaces.
Claim 17
Dependent Claim
26 words
The heat sink assembly of claim 1 wherein said first fin includes a surface protrusion to further increase the heat radiation out from said first fin.
Claim 18
Dependent Claim
22 words
The heat sink assembly of claim 16 wherein said surface protrusion and said hole are on opposite surfaces of said first fin.
Claim 19
Dependent Claim
15 words
The heat sink assembly of claim 1 wherein the electronic component is an integrated circuit.
Claim 20
Dependent Claim
33 words
The heat sink assembly of claim 1 wherein the electronic component includes a semiconductor die and encapsulant covering said die, and an end of said heat sink body is embedded in the encapsulant.
Claim 21
Dependent Claim
18 words
The heat sink assembly of claim 19 wherein said first and second fins are disposed above the encapsulant.
Claim 22
Dependent Claim
40 words
The heat sink assembly of claim 1 wherein the electronic component is a semiconductor package having a heat conductive lid, and an end of said heat sink body is attached with a heat conductive means to the heat conductive lid.
Claim 23
Dependent Claim
71 words
The heat sink assembly of claim 1 wherein a first part of said heat sink body is an integral part of said first fin and a second part of said heat sink body is an integral part of said second fin, one of said first and second parts includes a recess and the other includes a button which fits in said recess to thereby hold said first and second fins together.
Claim 24
Dependent Claim
20 words
The heat sink assembly of claim 22 wherein a gas relief groove is formed in a sidewall of said recess.
Claim 25
Dependent Claim
17 words
The heat sink assembly of claim 23 wherein thermal grease is between said button and said recess.
Claim 26
Dependent Claim
17 words
The heat sink assembly of claim 22 wherein a gas relief groove is formed in said button.
Claim 27
Dependent Claim
17 words
The heat sink assembly of claim 22 wherein a gas relief hole is formed through said button.
Claim 28
Dependent Claim
17 words
The heat sink assembly of claim 26 wherein thermal grease is between said button and said recess.
Claim 29
Dependent Claim
25 words
The heat sink assembly of claim of claim 1 wherein said second fin has a hole or a protrusion to increase heat radiation out therefrom.
Claim 30
Dependent Claim
114 words
A heat sink assembly, comprising: a heat sink body attachable relative to an electronic component to absorb heat therefrom; first and second heat sink fins extending out from said heat sink body to radiate absorbed heat in said heat sink body away from the electronic component; said first and second heat sink fins being parallel to and spaced from one another in a manner that defines a continuous uninterrupted cooling air layer around said heat sink body and extends from said heat sink body to the outer edges of said fins and in between said first and second fins; and said first fin includes a surface protrusion body to increase heat radiation out therefrom.
Claim 31
Dependent Claim
114 words
A heat sink assembly, comprising: a heat sink body attachable relative to an electronic component to absorb heat therefrom; first and second heat sink fins extending out from said heat sink body to radiate absorbed heat in said heat sink body away from the electronic component; said first and second heat sink fins being parallel to and spaced from one another in a manner that defines a continuous uninterrupted cooling air layer around said heat sink body and extends from said heat sink body to the outer edges of said fins and in between said first and second fins; and said first fin includes a surface protrusion body to increase heat radiation out therefrom.
Claim 32
Dependent Claim
19 words
The heat sink assembly of claim 29 wherein said protrusion is on a top surface of said first fin.
Claim 33
Dependent Claim
19 words
The heat sink assembly of claim 29 wherein said protrusion is on a bottom surface of said first fin.
Claim 34
Dependent Claim
23 words
The heat sink assembly of claim 29 wherein said protrusion defines a bump on a top or bottom surface of said first fin.
Claim 35
Dependent Claim
23 words
The heat sink assembly of claim 29 wherein said protrusion defines a continuous annular shape about a longitudinal axis of said first fin.
Claim 36
Dependent Claim
14 words
The heat sink assembly of claim 29 wherein said protrusion defines a radial rib.
Claim 37
Dependent Claim
18 words
The heat sink assembly of claim 29 wherein said first and second fins are each substantially flat discs.
Claim 38
Dependent Claim
39 words
The heat sink assembly of claim 29 wherein a first part of said heat sink body is integrally formed with said first fin, and a second part of said heat sink body is integrally formed with said second fin.
Claim 39
Dependent Claim
20 words
The heat sink assembly of claim 36 wherein said first and second parts are attached together using a button-recess arrangement.
Claim 40
Dependent Claim
27 words
The heat sink assembly of claim 37 wherein at least one of said first and second parts defines a shoulder spacing said first and second fins apart.
Claim 41
Dependent Claim
50 words
The heat sink assembly of claim 37 wherein said first or second part which has a recess element of the button-recess arrangement is formed at a higher temperature than the other said part having a button element of the arrangement to thereby expand and more readily accept the button element.
Claim 42
Dependent Claim
33 words
The heat sink assembly of claim 37 wherein after a button element of said arrangement is positioned in a recess element of said arrangement, said first and second parts are sinter fused together.
Claim 43
Dependent Claim
62 words
The heat sink assembly of claim 29 wherein a first part of said heat sink body is an integral part of said first fin and a second part of said heat sink body is an integral part of said second fin, one of said first and second parts includes a recess and the other includes a button which fits in said recess.
Claim 44
Dependent Claim
20 words
The heat sink assembly of claim 41 wherein a gas relief groove is formed in a sidewall of said recess.
Claim 45
Dependent Claim
17 words
The heat sink assembly of claim 42 wherein thermal grease is between said button and said recess.
Claim 46
Dependent Claim
17 words
The heat sink assembly of claim 41 wherein a gas relief groove is formed in said button.
Claim 47
Dependent Claim
17 words
The heat sink assembly of claim 41 wherein a gas relief hole is formed through said button.
Claim 48
Dependent Claim
17 words
The heat sink assembly of claim 41 wherein thermal grease is between said button and said recess.
Claim 49
Dependent Claim
23 words
The heat sink assembly of claim 29 wherein said second fin has a hole or a protrusion to increase heat radiation out therefrom.
Claim 50
Dependent Claim
135 words
A heat sink assembly, comprising: a first heat sink fin unit having a first body and a first heat sink fin extending radially outward from said first body to radiate away heat transferred thereby; a second heat sink fin unit having a second body and a second heat sink fin extending radially outward from said second body to radiate away heat transferred thereby, wherein said second heat sink fin is fully cantilevered and only supported in the center; said second body being mounted on said first body such that said second heat sink fin is parallel to and spaced from said first heat sink fin; and said second heat sink fin unit having a hole to increase exposed heat fin surface area of said second body and thereby radiation of heat from said second body.
Claim 51
Dependent Claim
135 words
A heat sink assembly, comprising: a first heat sink fin unit having a first body and a first heat sink fin extending radially outward from said first body to radiate away heat transferred thereby; a second heat sink fin unit having a second body and a second heat sink fin extending radially outward from said second body to radiate away heat transferred thereby, wherein said second heat sink fin is fully cantilevered and only supported in the center; said second body being mounted on said first body such that said second heat sink fin is parallel to and spaced from said first heat sink fin; and said second heat sink fin unit having a hole to increase exposed heat fin surface area of said second body and thereby radiation of heat from said second body.
Claim 52
Dependent Claim
22 words
The heat sink assembly of claim 48 wherein said hole is a blind hole on a top surface of said second body.
Claim 53
Dependent Claim
17 words
The heat sink assembly of claim 48 wherein said blind hole is filled with liquid and capped.
Claim 54
Dependent Claim
25 words
The heat sink assembly of claim 48 wherein said second heat sink fin includes a hole or a protrusion to increase heat radiating surface area.
Claim 55
Dependent Claim
25 words
The heat sink assembly of claim 48 wherein said first heat sink fin includes a hole or a protrusion to increase heat radiating surface area.
Claim 56
Dependent Claim
20 words
The heat sink assembly of claim 48 wherein said first body is in heat absorbing relation to an electronic component.
Claim 57
Dependent Claim
22 words
The heat sink assembly of claim 48 wherein said first and second heat sink fin units are each formed from powdered metal.
Claim 58
Dependent Claim
176 words
A heat sink assembly, comprising: a first heat sink fin unit having a first body and a first heat sink fin extending radially outward from said first body to radiate away heat transferred thereby, wherein said first heat sink fin includes a blind hole on one of a top or bottom surface thereof and a protrusion on the other surface, said hole and said protrusion increasing heat radiating surface area of said first heat sink fin; a second heat sink fin unit having a second body and a second heat sink fin extending radially outward from said second body to radiate away heat transferred thereby, wherein said second heat fin is fully cantilevered and only supported in the center; said second body being mounted on said first body such that said second heat sink fin is parallel to and spaced from said first heat sink fin; and said second heat sink fin unit having a hole to increase exposed heat fin surface area of said second body and thereby radiation of heat from said second body.
Claim 59
Dependent Claim
176 words
A heat sink assembly, comprising: a first heat sink fin unit having a first body and a first heat sink fin extending radially outward from said first body to radiate away heat transferred thereby, wherein said first heat sink fin includes a blind hole on one of a top or bottom surface thereof and a protrusion on the other surface, said hole and said protrusion increasing heat radiating surface area of said first heat sink fin; a second heat sink fin unit having a second body and a second heat sink fin extending radially outward from said second body to radiate away heat transferred thereby, wherein said second heat fin is fully cantilevered and only supported in the center; said second body being mounted on said first body such that said second heat sink fin is parallel to and spaced from said first heat sink fin; and said second heat sink fin unit having a hole to increase exposed heat fin surface area of said second body and thereby radiation of heat from said second body.
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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) | 2002-02-08 | 2002-08-10 | 2003-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-08 | 2006-08-10 | 2007-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-08 | 2010-08-10 | 2011-02-09 | $7700.00 | Window Closed / Lapsed |