The rights attached to a patent application or patent are transferable in whole or in part.
They may be the subject, in whole or in part, of an exclusive or non-exclusive licence to operate.
The rights conferred by the patent application or patent may be invoked against a licensee who infringes any of the limitations on his licence imposed under the preceding paragraph.
Subject to the case provided for in Article L. 611-8, a transfer of the rights referred to in the first paragraph does not affect the rights acquired by third parties prior to the date of transfer.
Acts involving a transfer or licence, as referred to in the first two paragraphs, shall be evidenced in writing, failing which they shall be null and void.