Patent US5754400A successfully refreshed from Google Patents.
US5754400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demountable heat sink
Assignee: International Business Machines Corp
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Filing: 1997-02-05
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Granted: 1998-05-19
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Expires: 2017-02-05
Abstract
Abstract A demountable, and thus re-usable, conductive heat sink for dissipation of excess heat of an electronic component. The heat sink uses a T-bolt and T-slot for attachment to the electronic component and the printed circuit board, respectively. This attachment eliminates the typical concerns associated with the placement of traces on the PCB to accommodate the holes placed therein for the attachment of conventional heat sinks. The improved designed also facilitates demounting of the heat sink from the printed circuit board and the electronic component without damage thereto.
Inventors
- 👤 Sanjeev Balwant Sathe
- 👤 Pratap Singh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:37
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/60; H10W40/611; H10W72/00; H10W72/851; H10W72/874; H10W72/877
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
An apparatus comprising: a printed circuit board; an integrated circuit attached to a surface of said printed circuit board; a heat sink placed on top of the integrated circuit; a bolt having upper and lower portions; a non-threaded slot having the same shape as the upper portion for receiving the upper portion and restraining the upper portion from vertical movement, the non-threaded slot being attached to the surface of the printed circuit board; a spring located between the bottom of the heat sink and the top of the non-threaded slot; and securing means for securing the lower portion to the heat sink and for applying an upward force via the spring to the upper portion such that the upper portion is restrained from horizontal movement via the non-threaded slot.
Claim 2
Independent Claim
129 words
An apparatus comprising: a printed circuit board; an integrated circuit attached to a surface of said printed circuit board; a heat sink placed on top of the integrated circuit; a bolt having upper and lower portions; a non-threaded slot having the same shape as the upper portion for receiving the upper portion and restraining the upper portion from vertical movement, the non-threaded slot being attached to the surface of the printed circuit board; a spring located between the bottom of the heat sink and the top of the non-threaded slot; and securing means for securing the lower portion to the heat sink and for applying an upward force via the spring to the upper portion such that the upper portion is restrained from horizontal movement via the non-threaded slot.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 wherein the non-thread slot is substantially similar in length to that of the heat sink.
Claim 4
Dependent Claim
24 words
The apparatus of claim 2 wherein the upper and lower portions of the bolt are a threaded end and a T shaped end, respectively.
Claim 5
Dependent Claim
12 words
The apparatus of claim 3 wherein the non-threaded slot is T shaped.
Claim 6
Dependent Claim
24 words
The apparatus of claim 1 wherein the upper and lower portions of the bolt are a threaded end and a T shaped end, respectively.
Claim 7
Dependent Claim
12 words
The apparatus of claim 5 wherein the non-threaded slot is T shaped.
References Cited (Backward Citations)
US3867003A
Cited
US4068368A
Cited
US4333101A
Cited
US4636580A
Cited
US4628990A
Cited
JPH04186752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-18 | 2001-11-17 | 2002-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-18 | 2005-11-17 | 2006-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-18 | 2009-11-17 | 2010-05-19 | $7700.00 | Window Closed / Lapsed |