Or are you saying the legislature is irrelevant, and the law is only what the courts say it is?
The US copyright code says you cannot patent ideas.
The US Supreme Court says you cannot patent ideas.
The Patent Office grants patents on ideas as a matter of course.
Who is right? And given the US tendency to sue at the drop of a hat, and as we have seen the tendency of the courts of first instance to just assume that patents are valid, then you're on to a crap shoot.
So, to take your "the ones that can be enforced", well, it depends, as a defendant, to what extent you are willing and able to defend it. Chances are, the lower court will stiff you. Chances are, if you're still in business, the Supreme Court will declare it invalid. So is that a patent that fits your description, or not?
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