This is silly

[Dark Lord Neo]

Lucas isn't claiming that they can't make a lightsaber like device. His claim is based on the idea that the handle for this device has been purposely modeled to look like the handle of the lightsabers form his movies. He doesn't have a patent on the technological aspects of lightsabers but he can hold a patent on the aesthetic appearance of the lightsabers in his movies.
So what this case is going to end up being about is whether this companies product really does resemble the aesthetic appearance of the handles that Lucas claims he has a patent for.