Where does this definition of patent office come from?
This entry for patent office is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is patent office a noun, verb, or something else?
In this entry, patent office is tagged as 2n..
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.