Article 42 Notification of lapsed patent

Where a patent has ceased to have effect because a renewal fee has not been paid within the period prescribed in rule 39(1) or (2) and the extended period specified in section 25(4) has expired without the renewal fee and prescribed additional fee having been paid, the comptroller shall, within six weeks after the expiration of the extended period, notify the proprietor of the patent of the fact and draw his attention to the provisions of section 28.