Earlier quoted context omitted.
That's like arguing that you thought it was legal to kill someone using radioactive isotopes and therefore you had no illegal intent. Patent infringement is defined by the corpus of protected inventions and being unaware of the locus of infringing actions is not a defence against infringement. If you make sufficient disclosure part of the patent system then this is the only way to do things really. If you don't requi…
It's completely different. For starters, there's the "reasonable person" test. No reasonable person is going to think that murder is legal. Intentionally infringing a patent is punished much more harshly, and it's impossible to keep up with the millions of patents that are published, so being intentionally unaware is actually a decent legal defence. And yes, this does mean that patents are generally pretty useless fo…
A patent is filed for technique X by company A,
Company B use technique X having created it independently,
The patent is issued to Company A,
Company B is now infringing upon Company A's patent.
Company B could not possibly have committed patent infringement intentionally, because the patent they infringed didn't even exist when they went about implementing their product.