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If people start using a brand name as a general noun for something, then the brand name is watered out. In the end it can mean that a brand name ceases to be protected. Back in the day there was a company called Primus, they made camping cookers... now a primus is a name for a camping cooker in many places.
I think the judges will find that thin rectangle with touchscreen form has already been watered down. It is simply what a tablet is. And Apple didn't start tablets, did they?