The state of software patents after the Alice decision

The state of software patents after the Alice decision

OK, I can see that a patent which has not yet been ruled invalid has some force, because of the presumption of validity.

But don't say that a patent is valid until overturned. If a patent is invalid, it is invalid from the moment it is issued. The way you get a patent "overturned" is to convince a court or a patent office that it is (and has always been) invalid.