IPA: /ˈpeɪtəntər/
KK: /ˈpeɪtɛntər/
A person or entity that gives permission to others to use an invention or idea, usually in exchange for payment or royalties.
The patentor allowed the company to use his invention for a fee.
Patentor is derived from the Latin 'patent' (meaning open or evident) and the suffix '-or' (meaning one who). The word refers to one who holds a patent, making their invention open for others to see and use under certain conditions.
Think of someone who makes their invention 'open' ('patent') for others to use, and the '-or' indicates that this person is the one who holds that patent.