From your question, I believe you are saying that an inventor has a patent titled Automatic Hazard Warning Lights in the United States. Patents are "territorial," meaning they can only be enforced in the country that issued the patent. If the inventor only has a US patent and Ford is making, using, selling and offering for sale the invention only outside of the United States, US patent law does not prevent Ford from doing that. The inventor would need a patent in each of the separate countries that Ford sells this system to have a patent infringement claim.
Answered on Oct 13th, 2012 at 12:04 PM