Isn't TM by category though?

Here's the Fujitsu TM: http://tess2.uspto.gov/bin/showfield?f=doc&state=4004:kb...

And here's the likely Apple: http://tess2.uspto.gov/bin/showfield?f=doc&state=4004:kb...

Absolutely, but they are very close in functionality so I expect a lot of fuss to be made about this.

If the difference between two devices is screen size and preferred user interface (touch screen vs buttons) then I think one will have to yield.

But there's not a conflict about the trademark. Fujitsu's TM is only for retail purposes. They certainly could have trademarked other uses if they wanted to. The iPad is pretty much everything but retail (i.e., search the "Apple" link for any mention of retail use cases).

EDIT: I thought those were permalinks. Sorry. If you go to the USPTO and search for iPad among the Live uses you'll soon see the Fujitsu one and one with many, many markets (along with one for bras, one for a medical device, etc). Though, check out iSlate. Similar filing info as the iPad but not as broad. Seems like if they were worried at all about Fujitsu they could have just used iSlate.

Not to mention HP's iPAQ line which has been around for quite a number of years.