On pouring money down a dead end road... Yeah, you're right, but then there are always a few foolish, or arrogant companies just as there are foolish or arrogant individuals. A lot of patent interference cases take place because one company (usually an industry-dominent one) doesn't think it has to license some small company's critical, or enabling technology. The key is in knowing the ethics of the players and industry you are dealing with!
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