If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email email@example.com.
Please tell us what format you need. It will help us if you say what assistive technology you use.
Patent decision: O/176/92 in the matter of a reference under section 8(1)(a) by John Edward Bolwell for Patent application 8915325.8 (serial no. GB2234063A) in the name of British Gas Plc dated 21 September 1992.