T9 patented while QWERTY is not?

Posted by Marco W. on Programmers See other posts from Programmers or by Marco W.
Published on 2012-06-04T14:11:58Z Indexed on 2012/06/04 16:54 UTC
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I've seen that there are lots of custom keyboards for Android, but all are QWERTY keyboards. I couldn't find any keyboard with T9 layout.

Is this because T9 is patented and the QWERTY layout is not? So if I made a T9 keyboard, I would have to pay patent fees?

So what does the patent protect when you look at T9? Only the layout? Or the prediction engine? The problem is, this way of predicting words is the only one that makes sense for this layout ...

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