WISDOM, Circuit Judge:
This is a patent infringement suit. We affirm the district court's conclusion that the patents sued on are invalid, but we reverse the award of attorney's fees to the defendants.
The subject of this suit is a device called a tacky mat stack. This is a type of doormat used at entrances to hospital surgical rooms and other rooms where the entrance must be clean. Because it is tacky (slightly sticky), the mat removes dirt and bacteria from...
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