Originally Posted by MP0WER
If what he said was legal that would mean since he paid Porsche to build him a 911 that he could make exact copies of them and sell or give them away at his will.... copyright infringement. You can believe that his explanation would not hold up in court when Porsche is suing his ass.
When you buy a car, you're not hiring Porsche to build you a specific design. You're paying for a good.
OP's situation is no different than any patent created by an engineer at, say, Apple. Does the patent belong to the engineer or Apple?
Edit: actually, the OP's situation is a bit different because OP is not an employee (but an independent contractor). Wikipedia is our friend here: http://en.wikipedia.org/wiki/Work_for_hire