Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.Neither an authoritative statement of the law nor legal advice. Quick work.
Three patent decisions, viz:
http://www.cafc.uscourts.gov/sites/default/files/opinions-orders/20-1315.OPINION.8-17-2021_1820379.pdf
http://www.cafc.uscourts.gov/sites/default/files/opinions-orders/20-1747.OPINION.8-16-2021_1819482.pdf
http://www.cafc.uscourts.gov/sites/default/files/opinions-orders/20-1876.OPINION.8-16-2021_1819528.pdf
CB