Paris Convention
Convention establishing World Intellectual Property Organization (WIPO)
Patent Cooperation Treaty (PCT)
Lusaka Agreement
The Hague Convention Abolishing the Requirement of Legalization for Foreign Public Documents

Patens of Invention
ARIPO Designations

12-month grace period for disclosures by the applicant or for unauthorised disclosures by a third party.

Formal examination, search (for foreign patent entries) and substantive examination, but in practice only formal examination is conducted.

20 years for filing date
Annual maintenance payments

The invention must be worked in Liberia within four years from the filing date, or three years from the grant of the patent whichever is later, in default hereof a non-voluntary license may be issued.