Northern Telecom Limited

Hasler R Hayes

Clifford D Read

John S Moss

Roman Katchmar

Hugh M Collins

John B Drayton

David J Pell

Tristano F Nicoletta

John Clayton Atkinson

Michael H Daniels

Circuit pack wherein the electronic components are arranged with high temperature operating components on one side of a PCB and low temperature components on the other side. The PCB acts as a thermal insulator to restrict heat flow from the hot to cooler components. The components on each side of the board are disposed in a vertical connection chimney for heat removal.

Circuit packs and circuit pack and shelf assemblies

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.

Electronic unit

Electronic module 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 modules are mountable in a support frame with air cooling passages of the heat sinks extending vertically for convected cooling air. In each module, 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.

Electronic module

Growing community of inventors

Munster Hamlet, Canada

Hasler R Hayes