Rule 64 – European search report where the invention lacks unity - The European Patent Convention, Implementing Regulations – to the Convention on the Grant of European Patents, Part IV – Implementing Regulations to Part IV of the Convention, Chapter II – European search report
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If the European Patent Office considers that the European patent application does not comply with the requirement of unity of invention, it shall draw up a partial search report on those parts of the application which relate to the invention, or the group of inventions within the meaning of Article 82, first mentioned in the claims. It shall inform the applicant that, for the European search report to cover the other inventions, a further search fee must be paid, in respect of each invention involved, within a period of two months. The European search report shall be drawn up for the parts of the application relating to inventions in respect of which search fees have been paid.
Any fee paid under paragraph 1 shall be refunded if, during the examination of the European patent application, the applicant requests a refund and the Examining Division finds that the communication under paragraph 1 was not justified.