The Montreal Protocol is widely regarded as one of the most successful international environmental agreements. Despite its recognized success in fighting the ozone hole, there have been also some concerns related with the role of intellectual property rights and standard setting organizations within the course of implementation. Exploiting a new and unique data set, we investigate the patenting activity of firms that have participated to regular meetings of the Montreal Protocol. This new database will allow us to investigate in later stages potential interaction effects of firm participation in policy and standardization meetings on the direction of technological change. The results of these analyses may also be indicative for the further development of the UNFCCC climate negotiation process after the Paris Agreement, in which potential technology mechanisms to develop and transfer technologies are discussed.