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/083/81 in the matter of application 1413494 by Yates Industries Inc and in the matter of opposition by Electrofoils Limited and Gould Foils Limited dated 17 August 1981.