Qinetiq Limited

Sondex Wireline Limited

Stuart John Eaton

Christopher Robert Lawrence

Jonathan Geoffrey Gore

Michael William Hopkins

Timothy Rupert Charles Jarman

Adrian Robert Bowles

George Jiri Tomka

Christopher Paul Hamblin

Adam Daykin

Alan Marshall

Apparatus for the wireless transmission of data, and preferably also of power, across a space between a length of production tubing and a surrounding casing in a petrochemical well, includes a pair of inductively-coupled coils, a first of which is located on the exterior of the production tubing generally coaxially therewith, and the second of which is located on the interior of the casing generally coaxially therewith. This may be used in particular as part of a system for transmitting power and data to/from a sensor monitoring the pressure and/or other environmental conditions within the 'B' annulus B of a sub-sea well.

Down-hole wireless communication system

In order to check the authenticity of a banknote or other such document it is printed with two patches of magnetisable ink, and each patch is magnetised to present a multipole sequence of alternating polarity. If the document is folded to bring the two patches together and then rubbed to and fro in the direction of the pole sequences, they will be subject to alternating forces of attraction and repulsion which can be sensed through the fingertips and gives the impression of a physically rippled texture notwithstanding that the patches actually have a smooth surface. The presence or absence of this effect can therefore be used to distinguish between a genuine document bearing such magnetised patches and a counterfeit which may be visually identical but lacks the correct magnetisation. In a variant only one of the patches is printed on the document itself and the other is on a separate 'key' device which is rubbed over it to test for the presence of the correct magnetisation.

Documentation authentication

Growing community of inventors

Farnborough, United Kingdom

Stuart John Eaton