SEC. 21. Term of patent.—The term of a patent shall begin on a date when the patent is issued as shown on the face thereof and shall expire seventeen years thereafter. However, a patent shall cease to be in force and effect if the patentee fails to pay the prescribed annual fees within the [prescribed times hereinafter provided or if the patent is canceled in accordance with the provisions of this Act.
Compiled from an official source version. Later amendments or repeals may not be reflected; the official text prevails. · Read the official text ↗ · Data as of 2026-07-04
CitationRA 165 Section 21 (LawPlayer, data as of 2026-07-04)
Source: Supreme Court E-Library, Republic of the Philippines. Philippine laws are public documents (works of the government).
