General Electric Company

Bae Systems Electronics Limited

William Martin Lovell

Rosemary A Lee

Giles Humpston

David M Jacobson

James Hugh Vincent

Surinder Pal Singh Sangha

Brian Frederick Nicholson

A housing for a microwave circuit is formed from a base made of metal matrix composite material and walls made of sheet metal. The base and the walls are joined together by diffusion soldering. Some holes to receive feedthroughs are formed at the junction of the base and a wall.

Electrical apparatus

A field emission device which may be used, for example, as a surge arrester, comprises two electrode structures each comprising a substrate from which project tapered electrically-conductive emitter bodies. The structures are bonded together, face-to-face, so that the emitters all project into a sealed space formed between the substrates. The space may be evacuated or gas-filled. The emitters are formed by depositing a conductive layer on each substrate, forming masking pads on the layer at the required emitter positions, and etching the conductive layer to leave a tapered body beneath each pad. The dimensions of the emitter bodies and the spacing between the substrates are preferably of the order of a few microns.

Method of making electronic devices

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Fareham, United Kingdom

William Martin Lovell