Yeah, well, I doubt they'd build up an inventory unless they plan to sell it everywhere they can.
There are cases of small companies with patents on research and development procedures who learn too late that others utilized their patented methods to refine drug discovery and development.
When the other company is done with R&D and creates a drug that makes it to the market, my understanding is that patents "violated" during development mean nothing, as the final product is not covered by patented methods used to discover it.