Patent Attorney Act Article 16

When the number of patent attorneys registered with the Specific Patent Agency reaches 15, the patent attorneys so registered shall establish the Patent Attorneys Association.The Patent Attorneys Association may not reject membership to qualified patent attorneys.
中文原文 專利師法第16條
專利專責機關登錄之專利師,滿十五人者,應組織專利師公會。
專利師公會不得拒絕具有會員資格者入會。

English translation for reference only; the Chinese text prevails. Not legal advice.