If the invention was displayed in an international exhibition, the disclosure will be disregarded if you:-
(a) state, on filing the patent application, that the invention has been so dislayed.
(b) within 4 months from the date of filing, file a certificate from the authority responsible for the exhibition.
(c) file the patent application within 12 months from the date of display in the international exhibition.
If you want to find out whether a particular exhibition is in the list of international exhibitions recognised for this purpose, please visit this website at
www.bie-paris.org.