Earlier quoted context omitted.
>So? Other companies are free to make the unchanged version after the original patent expires. No they're not. You misunderstand; the original patent doesn't expire. It's EXTENDED. The original drug does not go into any public domain to be manufactured or built on by other companies. Many drug manufacturers make generic drugs, but that number has decreased, which has led to behavior like the larger original drug manu…
> the original patent doesn't expire. It's EXTENDED. Really? I can find no indication that US patent law allows for extension of patents at all except as a result of delays caused by the USPTO or regulatory delays (e.g. reviews by the FDA). Everything I've seen about evergreening has been tied to filing new patents covering things like delivery systems to make it harder to produce a generic that doesn't infringe, and…
Thank you for pointing out what I wasn't able to push through my thick skull!