A lot of 3D printing patents from the 80s and 90s expired between 2010-2020, clearing the way for commercial 3d printers and a million innovations. I’d call them honorary 21st century inventions, since the patent holders squandered the technology in the 90s.
https://www.finnegan.com/en/insights/articles/how-patents-die-expiring-3d-printing-patents.html
Thanks for the Rec! I definitely miss the show. Adam’s YouTube channel sometimes scratches the itch, but not always.