> Quite simply a patent can be invalidated by someone simply inventing it themselves, which turns something from 'original' to 'obvious' and thus non-patentable

> Quite simply a patent can be invalidated by someone simply inventing it themselves, which turns something from 'original' to 'obvious' and thus non-patentable. Just because an invention is re-invented, or invented independently more or less at the same time, does not mean it is unpatentable, obvious, or that an already granted patent is invalid. At most it is evidence of obviousness.