registrant

One who registers or is registered.

One who registers; especially, in patent law, one who registers a trade-mark or patent.

One who registers; esp., one who , by virtue of securing an official registration, obtains a certain right or title of possession, as to a trade-mark.

One who registers something or is registered.

a person who is formally entered (along with others) in a register (and who obtains certain rights thereby)