Raychem Limited

Printable Field Emitters Limited

Stephen Michael Baigrie

George B Park

James A Rinde

Robert P Saltman

Edward F Chu

Vijay N Reddy

Richard J Penneck

Adrian Paul Burden

Per J Jensen

George M Gansbuehler

Alan L Brown

Graphite comprises atoms arranged in discrete layers (). The perpendicular distance between these layers is the 'd-spacing' (). A field emission material is obtained by expanding the d-spacing (). Such expansion may be achieved by an intercalant that has been introduced between layers of the material. Such an intercalant may reside, or may no longer reside, in the material. The material may be placed in position on a substrate by a printing process, prior to expansion. Such field emission material may be used in cold cathodes in field electron emission devices.

Field emission material having an inter-layer spacing and further coated with insulating material

A conductive polymer composition in which a particulate conductive filler is dispsered in a polymeric component which is a mixture of an essentially amorphous thermoplastic resin and a thermosetting resin. In preferred compositions, the amorphous thermoplastic resin and the thermosetting resin are substantially mutually soluble. In order to improve the thermal stability of the composition on exposure to successive thermal cycles, it is preferred that the composition be cured by heating the uncured mixture of amorphous thermoplastic resin, thermosetting resin, and particulate conductive filler at a rate of at least 15.degree. C./minute to the cure temperature.

Conductive polymer composition

A conductive polymer composition in which a particulate conductive filler is dispersed in a polymeric component which is a mixture of an essentially amorphous thermoplastic resin and a thermosetting resin. In preferred compositions, the amorphous thermoplastic resin and the thermosetting resin are substantially mutually soluble. In order to improve the thermal stability of the composition on exposure to successive thermal cycles, it is preferred that the composition be cured by heating the uncured mixture of amorphous thermoplastic resin, thermosetting resin, and particulate conductive filler at a rate of at least 15.degree. C./minute to the cure temperature.

A tubular heat recoverable article comprises conductive polymeric material and is heated to effect recovery by the passage of electrical current therethrough. Elongate electrodes are attached on the surface or embedded in longitudinal flanges extending along the article. The flanges also comprise conductive polymeric material but are not heat recoverable, and therefore remain substantially undeformed on recovery other than bending to accommodate transitions. This means that the contact resistance between the electrode and the conductive material of the flange does not increase significantly on recovery.

Heat recoverable article

High frequency attenuation cable has a core surrounded by an EMI shielding layer. The core comprises at least one inner conductor, at least one high frequency absorption layer or non-amorphous magnetic metal tape surrounding, but not necessarily adjacent to, the inner conductor, and at least one dielectric layer surrounding, but not necessarily adjacent to, the inner conductor. The constructions according to the invention enable improved attenuation at frequencies in the range of 10-100 MHz.

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Swindon, United Kingdom

Stephen Michael Baigrie