Today patent infringement lawsuits are common. If your someone accuses you of infringing its patent, the first thing you should do is make sure that the patent valid. How?
All patents must be new, have inventive step and have industrial application. The grant of a patent by the Patent and Trademark Office (eg Spanish) does not ensure that the patent meets these requirements. Specifically, the legislation states that the patent is granted without prejudice to third parties.
In this direction, if we prove that the patent was granted even if breached any of the above requirements (novelty, inventive step, industrial application) the patent is revocable nd consequently nobody may infringe.
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