> back then, the granting of a patent was a sort of de-facto legal recognition of the novelty. There is still a de jure presumption of validity for an issued p

> back then, the granting of a patent was a sort of de-facto legal recognition of the novelty. There is still a de jure presumption of validity for an issued patent, but it only means that when a patentee sues an alleged infringer, the patentee doesn’t have to first prove the patent is valid. An accused infringer will usually challenge the validity of the patent, it just won’t happen at the earliest stage of the trial.