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I think it's fine to ask about and discuss already approved patents on Ask Patents. See the answer to: http://patents.stackexchange.com/q/191/288

> But you can still ask for or post prior art and potentially make a difference.

> Even though you can't just submit that for free on a granted patent, you make it a bit easier for the folks that do have skin in the game by sharing what you have on the problematic patent(s). That way, if someone is sued for infringing, they'll be armed with what they need to defend themselves.



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