As a retired lawyer, I usually keep my head down when the lawyer jokes start flying. But after 40 years in the business, I have found that most lawyers would be out of business if people did the right thing voluntarily, like not use patent numbers that are not their own. Model A owners have no worries, they are not claiming or representing the patent plate numbers as their own. It no different than using a tool with a patent number on it. In Cambodia, they really did kill all the lawyers, and in Nazi Germany and the Soviet Union the only lawyers allowed were party hacks. Think it through.