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I haven't read the patent or even all the posts but it looks like the application is a variation on Blisssymbolics. I suspect that with sufficient resources (i.e. money) many of the patents could be invalidated through "prior art." It would take time, a lot of money and the patents would probably expire before it even went to court. As always, only the lawyers would profit. This sounds like something that should never have been granted a patent in the first place. There are many examples of "symbol boards" that have been in use, putting symbols on a tablet and then have the tablet speak does not strike me as being sufficiently novel for a patent, having the symbols change dynamically is no different from using overlays.
This really cries out for some one to challenge the patent. But by the time it will be resolved, the child will be middle aged.
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