In a recent decision[1], the Ontario Superior Court of Justice, Divisional Court (the “Court”), affirmed the enforceability of patent restrictive covenants (so-called “no-challenge clauses”) in settlement agreements.

In 2014, Loops L.L.C. and Loops Flexbrush L.L.C. (“Loops”) and Maxill Inc. (“Maxill”) entered into a settlement agreement to resolve a patent infringement action by Loops against Maxill. The agreement, governed by the laws of Canada and Ontario, contained a no-challenge clause in which Maxill agreed “not to directly or indirectly assist any person in attacking the validity” of certain Loops patents.[2] Loops subsequently commenced actions in Ontario and Utah claiming Maxill breached the agreement and infringed a U.S. patent covered by the agreement.[3] Loops filed a motion for an interlocutory injunction in the Ontario action. The motion judge dismissed the injunction request.[4] The motion judge found that a strong prima facie case was lacking because Loops’ evidence was rebutted by the fact that the no-challenge clause was not reasonable in the public interest, based on U.S. caselaw principles.[5]