US5276584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic unit
Assignee: Nortel Networks Technology Corp
•
Filing: 1993-04-02
•
Granted: 1994-01-04
•
Expires: 2013-04-02
Abstract
Abstract Electronic unit of printed circuit board with electronic components on one side and its other side in heat conducting contact with a heat sink enables the electronic components to be sealed from ambient atmosphere and thus unpackaged chips may be used. The units are mountable in a support frame with air cooling passages of the heat sinks extending vertically for convected cooling air. In each unit, a resistor network may extend into a cavity formed in a heat exchange rib and an electronic chip, perhaps unpackaged in the sealed environment, may be in heat conductive relationship with the heat sink.
Inventors
- 👤 Hugh M. Collins
- 👤 Hasler R. Hayes
- 👤 John S. Moss
- 👤 Clifford D. Read
- 👤 Tristano F. Nicoletta
- 👤 John B. Drayton
- 👤 David J. Pell
- 👤 Roman Katchmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:28
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/20; H05K7/20536; H05K7/20545
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
An electronic unit comprising a printed circuit board and a heat sink means, the printed circuit board assembled to a surface of the heat sink means which also has a heat release projection means exposed for contact by a flow of cooling fluid across the heat release projection means, the projection means including at least one rib formed with a cavity which opens on the surface of the heat sink means and terminates in a position spaced from each end of the rib, and the printed circuit board has a resistor network extending outwardly from the board and into the cavity with sides of the cavity sufficiently close to the resistor network that heat exchange occurs across the gap from the resistor network and into the rib.
Claim 2
Dependent Claim
127 words
An electronic unit comprising a printed circuit board and a heat sink means, the printed circuit board assembled to a surface of the heat sink means which also has a heat release projection means exposed for contact by a flow of cooling fluid across the heat release projection means, the projection means including at least one rib formed with a cavity which opens on the surface of the heat sink means and terminates in a position spaced from each end of the rib, and the printed circuit board has a resistor network extending outwardly from the board and into the cavity with sides of the cavity sufficiently close to the resistor network that heat exchange occurs across the gap from the resistor network and into the rib.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-03 | 1997-07-05 | 1998-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-03 | 2001-07-05 | 2002-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-03 | 2005-07-05 | 2006-01-04 | $7700.00 | Window Closed / Lapsed |