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US 4,066,987 AGranted
Electromagnetic waveguides
AssigneeBICC Limited
InventorsAlexander Joseph Moore, David Alexander Taylor, David James Greene
Life of this patent
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AssigneeBICC Limited
InventorsAlexander Joseph Moore, David Alexander Taylor, David James Greene
Estimating the term…
In a rigid electromagnetic waveguide, reinforcing elements (e.g. glass fibres) or one or more layers of the reinforcing wall extend lengthwise, preferably parallel to the waveguide axis, throughout the length of the waveguide. Preferably in the outermost layer or in outer layers of the reinforcing wall reinforcing elements extend helically about the waveguide. The longitudinally extending reinforcing elements are preferably applied to a stationary mandrel, which may be arranged vertically, through an annular guide which travels to and fro along the length of the mandrel, the elements being retained at the start and finish of each pass of the guide. The resistance of the waveguide to bending when supported horizontally is increased.
An electromagnetic waveguide comprising a circumferential electrically conductive layer and, surrounding the electrically conductive layer, a reinforcing wall comprising at least one layer of reinforcing elements bonded with resin, wherein reinforcing elements of said layer of the reinforcing wall extend substantially parallel to the axis of the waveguide throughout substantially the whole of its length.
An electromagnetic waveguide comprising a circumferential electrically conductive layer and, surrounding the electrically conductive layer, a reinforcing wall comprising at least one layer of reinforcing elements bonded with resin, wherein reinforcing elements of said layer of the reinforcing wall extend lengthwise throughout substantially the whole length of the waveguide and make less than half a helical turn per meter of a manufactured length of waveguide.
Dependencies are inferred from the claim text.