先せん使し用よう権けん

noun

right of prior use; prior use rights

Legal term in patent law: the right of a party that was already using an invention before another party filed a patent application to continue using it.

• 特とっ許きょ法ほうでは、先せん使し用よう権けんが認みとめられる場ば合あいがある。

  Under patent law, a right of prior use may be recognized in some cases.