Az elsőbbségi jogosultság "right of priority", a jogosult az, aki ennek birtokosa.

Article 4
A to I. Patents, Utility Models, Industrial Designs,
Marks, Inventors’ Certificates: Right of Priority
A. (1) Any person who has duly filed an application for a patent, or for the registration of a utility model, or of an industrial design, or of a trademark, in one of the countries of the Union, or his successor in title, shall enjoy, for the purpose of filing in the other countries, a right of priority during the periods hereinafter fixed.

Priority document
A copy of the earlier application of which the priority is claimed, certified by the authority with which it was filed.
http://www.wipo.int/pct/en/texts/glossary.htm

Magyar Szabadalmi Hivatal:
Elsőbbségi tanúsítvány
Az elismert bejelentési napon benyújtott beadványról a jogosult, a jogosult jogutódja vagy képviselője hitelesített másolatot kérhet.
Ugyanez náluk angolul:
Priority certificate
The rightholder, or the successor in title of the rightholder, or his representative may request a certified copy of the application filed on the date of filing accorded.
www.hpo.hu/.../ugyek/adatszolgaltatasok_elsobbsegi.html

A primary assignee az, akire a jogokat átruházzák, amennyiben megtörténik ilyen átruházás.