Patents that are not court tested are not worth a lot by themselves. An acquirer othe p atents will have the same issue. No one pays royalties just because you send them an invoice. If there has been no court test on validity, then they will hold payment until someone gets sued and loses. Just the way it is. Every major patent that I know of has been court tested, some valid, some not. And you are in big trouble if you are a small company without much money. Infringers know legal bills are cheaper than paying royalties.
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