I try to search for any information about this. And I found some information at http://tarr.uspto.gov/. When I input the serial number. I saw Apple 's application is in processing. I understand, it is not completely registration. And if I had domain name that contains ipad. Can Apple forces me to give my domain to them or delete it. Thank you very much.
If your domain is used for anything related to the Apple iPad then yes they can take it from you. If you want to use it for something completely unrelated then you might be okay but I doubt if that is your plan.