Mickey Mouse isn’t a trademark.
I believe the rat is both. If I'm wrong and you have some documentation of same, I'd be glad to take a look at it. Some aspects of the rat are covered under copyright for all eternity (or until Disney can't find enough politicians to bribe to extent it), and some aspects are covered under TradeMark.
That's my understanding anyway. My knowledge of trademark law is admittedly sketchy at best.