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/024/97 in the matter of a reference under section 37(1) by Earl Plastics (R W Hartley and E R Livesey) for patent no 2271755 in the name of Advanced Extrusion Developments Limited dated 28 January 1997.