Patent US5548090A successfully refreshed from Google Patents.
US5548090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sink and printed circuit board combination
Assignee: Nortel Networks Ltd
•
Filing: 1995-08-21
•
Granted: 1996-08-20
•
Expires: 2015-08-21
Abstract
Abstract A heat conductor has a plurality of resilient elongate elements, each being connected to a surrounding base of the conductor through two neck portions and being pivoted about its common axis. Two end portions of each elongate element are curved. When the heat conductor is mounted on a heat sink which is held over a plurality of electronic components mounted upon a printed circuit board, the curved end portions contact both the components and the heat sink with an appropriate pressure, because of the torsional action of the neck portions. The elongate elements provide short thermal paths to directly conduct the heat generated by the components to the heat sink.
Inventors
- 👤 Mark R. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:39
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/20; H05K7/2039; H05K7/20436; H05K7/20445; H10; H10W; H10W40/00; H10W40/20; H10W40/22; H10W40/70; H10W40/77
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
194 words
A heat sink and printed circuit board combination comprising: a printed circuit board having at least one electronic component extending from one side surface thereof; a heat sink mounted to face the one side surface of the board and spaced from the electronic component; and a compliant heat conductor for conducting heat into the heat sink, the heat conductor disposed between the component on the board and the heat sink and including a sheet metal base and a resilient heat conductor element integrally connected to the base by two resilient neck portions disposed one at each end of the conductor element with the element pivoted relative to the base about an axis extending through the neck portions, the heat conductor element extending between the heat sink and the electronic component and having two edge portions disposed one laterally on each side of the pivotal axis with one edge portion in contact with the heat sink and the other edge portion in contact with the electronic component, the edge portions being maintained in contact with the heat sink and the electronic component by resilient torsional action of the two neck portions about the pivotal axis.
Claim 2
Dependent Claim
194 words
A heat sink and printed circuit board combination comprising: a printed circuit board having at least one electronic component extending from one side surface thereof; a heat sink mounted to face the one side surface of the board and spaced from the electronic component; and a compliant heat conductor for conducting heat into the heat sink, the heat conductor disposed between the component on the board and the heat sink and including a sheet metal base and a resilient heat conductor element integrally connected to the base by two resilient neck portions disposed one at each end of the conductor element with the element pivoted relative to the base about an axis extending through the neck portions, the heat conductor element extending between the heat sink and the electronic component and having two edge portions disposed one laterally on each side of the pivotal axis with one edge portion in contact with the heat sink and the other edge portion in contact with the electronic component, the edge portions being maintained in contact with the heat sink and the electronic component by resilient torsional action of the two neck portions about the pivotal axis.
Claim 3
Dependent Claim
46 words
A heat sink and printed circuit board combination according to claim 1, wherein a plurality of electronic components extend from said one side surface of the printed circuit board and a plurality of heat conductors are provided, one individual heat conductor means for each electronic component.
Claim 4
Dependent Claim
81 words
A heat sink and printed circuit board combination according to claim 1, wherein a plurality of electronic components extend from said one side surface of the printed circuit board, and the heat conductor includes a single common sheet metal base held between the heat sink and the printed circuit board, the sheet metal base having a plurality of groups of resilient heat conductor elements, each group of the heat conductor elements extending between an individual electronic component and the heat sink.
Claim 5
Dependent Claim
32 words
A heat sink and printed circuit board combination according to claim 1, wherein each edge portion is curved, the curved portions having convex surfaces contacting the heat sink and the electronic component.
Claim 6
Dependent Claim
49 words
A heat sink and printed circuit board combination according to claim 1, including a plurality of heat conductor elements at least one of which is pivoted in one direction relative to its axis and at least another of which is pivoted in the opposite direction relative to its axis.
Claim 7
Dependent Claim
29 words
A heat sink and printed circuit board combination according to claim 1, including a plurality of heat conductor elements which are pivoted in the same direction around their axes.
References Cited (Backward Citations)
US4707726A
Cited
US4887147A
Cited
US4888637A
Cited
US5050040A
Cited
US5155661A
Cited
US5306866A
Cited
US5315480A
Cited
US5390078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-20 | 2000-02-19 | 2000-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-20 | 2004-02-19 | 2004-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-20 | 2008-02-19 | 2008-08-20 | $7700.00 | Window Closed / Lapsed |