Transfer of Shares in Patent or Trademark Co-Ownership: Is the Other Co-Owner's Agreement Necessary?

The co-ownership of a patent or trademark is common in the case of collaboration between inventors, industrial partners or partners of a start-up. This legal configuration remains particularly delicate, especially when one of the owners proceeds with the transfer of its share without prior notification to the other co-owner. The recent jurisprudence of the Paris court of 7 February 2025 sheds light on the obligations of co-owners with regard to …