If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email firstname.lastname@example.org.
Please tell us what format you need. It will help us if you say what assistive technology you use.
Patent decision: O/147/93 in the matter of a request under section 10 concerning Patent application no 2234658 in the names of Brian West and Anthony Michael Gibbon dated 22 November 1993.