Samsung argued that Apple's claims are invalid due to previously registered patents relating to design elements and functionality.
But Apple argue that its own product's design is far superior to those which came before the iPad and iPhone, and so therefore its patents should not be invalidated.
Wow you can't make this stuff up...
Seriously the whole patent system should just be thrown out the window at this point. First of all it does not do what it was first meant to do, and second of all a system like that is no longer needed. Technology is moving FAR FAR faster than when the system was put into place. At this point, it only hold back innovation (REAL innovation, not Apple "innovation"). Back then, technological advancements were much slower and it was put into place so that when someone invented something usefull, people couldn't just copy it. That way people had an incentive to invent things, knowing that they could profit on it without fear of their profits stolen by others. Technology wasn't moving as fast as it is now, so it would run its usefull life. At this point, though, technology is moving so fast that by the time the patent runs out, we are already multiple generations ahead and the patent was only used for a fraction of the time it was granted. Not to mention the most used patents have nothing to do with technology, and the most usefull patents usually go unlicensed (see Apple's history with GSM, wi-fi). So now it only ends up holding back technology. There really is no point to the patent system anymore.