US4823869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sink
Assignee: International Business Machines Corp
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Filing: 1988-03-02
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Granted: 1989-04-25
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Expires: 2008-03-02
Abstract
Abstract An improved heat sink is disclosed in which a plurality of heat conducting fins extends form a base of heat conductive material. The top surface of the base is peaked to reduce the dead space that would otherwise occur during vertical impingement air flow. In the preferred embodiment, the top surface is pyramidal in shape with the peak at the center. In other embodiments, the top surface can be convex or concave and have the peak located off center. Also, webs of material can be left at the bottom of the cooling fins to provide channels for improved air flow.
Inventors
- 👤 Allen J. Arnold
- 👤 Kerry L. Sutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:12
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/20; H10W40/22; H10W40/226; H10W40/228
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
A heat sink for cooling modules containing semicondcutor chips comprising: a base member of heat conducting material having a top surface and a bottom surface, said bottom surface in thermal contact with at least one semiconductor chip, said top surface having a pyramidal top surface having a peak at the intersection of four triangular surfaces; and a rectilinear array of cooling fins extending from said top surface, said rectilinear array providing a plurality of air flow channels between said cooling fins and in contact with all of the triangular planar surfaces; whereby an impinging flow of cooling air is directed by the peak of the top surface through the air flow channels and along the top surface, thereby improving the cooling efficiency of the heat sink.
Claim 2
Dependent Claim
126 words
A heat sink for cooling modules containing semicondcutor chips comprising: a base member of heat conducting material having a top surface and a bottom surface, said bottom surface in thermal contact with at least one semiconductor chip, said top surface having a pyramidal top surface having a peak at the intersection of four triangular surfaces; and a rectilinear array of cooling fins extending from said top surface, said rectilinear array providing a plurality of air flow channels between said cooling fins and in contact with all of the triangular planar surfaces; whereby an impinging flow of cooling air is directed by the peak of the top surface through the air flow channels and along the top surface, thereby improving the cooling efficiency of the heat sink.
Claim 3
Dependent Claim
30 words
The heat sink as claimed in claim 1 further comprising a plurality of residual webs of material between said cooling fins to direct the air flow over said top surface.
Claim 4
Dependent Claim
20 words
The heat sink as claimed in claim 1 wherein said base member and said cooling fins are comprised of aluminum.
Claim 5
Dependent Claim
20 words
The heat sink as claimed in claim 2 wherein said base member and said cooling fins are comprised of aluminum.
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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 |