Has the patent expired? https://morris.cymru/2009/01/penroses-patent-and-the-battle-of-the-tissue-tiles-contains-mathematics/ https://morris.cymru/2009/01/penro

Has the patent expired? https://morris.cymru/2009/01/penroses-patent-and-the-battle-of-the-tissue-tiles-contains-mathematics/ https://morris.cymru/2009/01/penroses-patent-and-the-battle-...