Two or more applicants – common agent and common representative
If there are two or more applicants, a professional representative (see point 2.9.003) may be appointed as "common agent" (see point 1.9.003).
Moreover, if two or more applicants file the application, they may also appoint one of them as "common representative" (see point 1.9.003). If no common agent or common representative is appointed, the applicant first named in the PCT request form who is entitled to file an application with the EPO as receiving Office is considered to be the common representative ("deemed common representative") (see point 1.9.004).
WIPO PCT Guide, 11.005 - 11.006
Source: http://www.epo.org/applying/international/guide-for-applicants/html/e/ga_c2_9_2.html
Date retrieved: 17 May 2021