Changing the rules of the game is fundamentally unfair, which would be obvious to everyone if we were talking about football, soccer or playing a board game. Somehow common sense is abandoned when dealing with patents. Changing patent laws in midstream seems particularly un-American, both because it disturbs vested property rights and because it is quintessentially anti-inventor. If we want to maximize a property rights regime it must be certain, stable and predictable. Patents are no exception.
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