Intamin discovering a potential safety/reliability issue always made more sense to me than someone claiming copyright/patent infringement. The latter would in theory affect Intamin, not the rides themselves.
(As an example, not a lawyer, etc - Company X discovers Intamin infringed on their patent/copyright for the tire launch! Company X sends a cease & desist letter to Intamin, forcing them to stop producing/offering this product to parks and demanding compensation for the rides already installed. The parks with those rides wouldn't be liable here, unless there's more to this story, as they trusted Intamin acted in good faith when selling and delivering the contracted product. It would be Intamin's responsibility to satisfy Company X, or, alternatively, provide a new launch for each of the affected rides...)
...Actually, I may have just answered my own question about how we got here if this indeed linked to a legal dispute, but I just can't imagine Intamin would put itself in such a position. It would still likely need to pay damages to Company X and pay for the new launches and compensate the parks for the downtime linked to their negligence.