In Brief:  The first sale of a patent is determined by contract law.

The Patent Office can invalidate a patent even if a court did not. %CUT% Oils States Energy LLC won a patent infringement judgment against Green Energy Group LLC. But then, the Patent Trial and Appeal Board (“PTAB”) invalidated the patent leaving Oil States emptyhanded. Oil States appealed arguing that the PTAB, an Article III (of the US Constitution) administrative tribunal, couldn’t come out differently from an Article I court. The US Supreme Court decided against Oil States. SCOTUS held that patents are a “public right”. They are a public franchise granted by the government to the owner of the patent for a period of 20 years. So, the administrative body can determine patent validity without paying homage to a different decision by a federal court.