The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 1990
Filed:
Feb. 27, 1990
Rosemary A Lee, Northwood, GB;
William M Lovell, Fareham, GB;
Abstract
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.