Even if the Germany does ratify, there are potential other hurdles to the operation of the UPC and the new unitary patent system, said Schneider.
"The announcement that the UK will not participate in the UPC throws up further potential barriers to the UPC project," Schneider said. "There has already been debate about whether the non-participation of the UK, as a major centre for patent litigation, reduces some of the benefits for business of choosing to litigate their patents before the UPC. However, another potentially fatal issue for the project stems from the fact the UK, despite not intending to participate any longer and having now left the EU, has already completed ratification as it might be argued that the UPC is not properly constituted if UK judges do not take up their seats in the courts or are excluded from doing so."
"Ultimately, the UPCA may need to be revisited to overcome this issue with there being a consequential need for re-ratification and subsequent delay to the whole system becoming operational," Schneider said.
As currently worded, the UPCA envisages participation in the UPC system by EU member states only. Despite completing ratification of the UPCA, the UK's long-term participation in the new system had been in doubt as the UPCA provides for the supremacy of EU law and the jurisdiction of the Court of Justice of the EU (CJEU) as ultimate arbiter. The UK government confirmed earlier this year that it now no longer plans to participate at all.
London-based Christopher Sharp of Pinsent Masons said: "It is important for UK businesses to understand that the UK government's non-participation announcement does not mean that they cannot benefit from a new UPC system, if the various issues around it becoming operational can be resolved. Given the cross-border nature of the UK’s key industries – pharmaceuticals, engineering, high-tech – litigants would still be able to utilise the UPC system, and its benefits of multi-jurisdictional relief and cost efficiency."
Ireland, a growing centre for patent litigation, has still to complete its ratification process.
Dublin-based Ann Henry of Pinsent Masons said: "In Ireland the ratification of the UPCA will require a referendum to amend the Constitution. With the UK deciding not to participate in the UPC given Brexit, the Irish government will want to consider carefully the implications of that decision."
"In referendums in Ireland, by law, the public must have made available to them objective research-based analysis on the pros and cons of voting for or against any referendum. Most patent litigation cases in Ireland concern patents in the life sciences sector. Many of the leading global pharmaceuticals manufacture in Ireland and so the implications of the reliefs available under the UPC system are of interest. The government will listen to a range of stakeholders given how events are unfolding and will be keenly interested to hear the views of the life sciences sector in Ireland," she said.