Where does “патентный” come from?

патентный (Russian) comes from Russian пате́нт, from German Patent, from Latin patēns, from Latin pateō, from Proto-Indo-European peth₂- — to spread out; to fly.

патентный (Russian): patent

Definitions

patent

Ancestry of “патентный”, step by step

Step	Language	Word	Meaning
1	Russian	пате́нт	patent, licence
2	German	Patent	patent
3	Latin	patēns	being opening; open
4	Latin	pateō	to be open, accessible, attainable
5	Proto-Indo-European	peth₂-	to spread out; to fly

Every word from Proto-Indo-European peth₂- →Every word from Latin pateō →Every word from Latin patēns →