One only has to look at the gif patent (I think I've got the right one) where the USPTO granted two different patents on THE SAME algorithm. All Google has to do (and the tighter the patent is, the easier this is to do) is find a prior implementation of the same technique, and BOOM, the patent is gone.
I can't see it being hard for Google to find prior art. After all, they are the masters of search ... :-)
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