In short - you violate a patent if you use, sell or offer to sell something that violates the patent. So if you moved the company abroad (or were a non US enti

In short - you violate a patent if you use, sell or offer to sell something that violates the patent. So if you moved the company abroad (or were a non US entity in the first place) then you're fine, providing you never wanted to sell to US customers. The issue is that in reality, few companies (wherever they are domiciled) want to exclude themselves from the US market place. Which despite being not that big in terms of people (Europe, China, India, SE Asia are individually all bigger) it is hugely significant in terms of advertising spend, technology adoption, and funding.