Decisions incurring a period for appeal or a petition for review, summonses and other such documents as determined by the President of the European Patent Office shall be notified by registered letter with advice of delivery. All other notifications by post shall be by registered letter.
Where notification is effected by registered letter, whether or not with advice of delivery, such letter shall be deemed to be delivered to the addressee on the tenth day following its posting, unless it has failed to reach the addressee or has reached him at a later date; in the event of any dispute, it shall be incumbent on the European Patent Office to establish that the letter has reached its destination or to establish the date on which the letter was delivered to the addressee, as the case may be.
Notification by registered letter, whether or not with advice of delivery, shall be deemed to have been effected even if acceptance of the letter has been refused.
To the extent that notification by post is not covered by paragraphs 1 to 3, the law of the State in which the notification is made shall apply.