Patent Act Article 69

Restriction on abandoning or amending patent rightA patentee shall not abandon the patent right, or apply for a post-grant amendment as stated in Subparagraph 1 or 2, Paragraph 1 of Article 67 without the consent from the licensee(s) or pledgee(s).Where a patent right is jointly owned, no joint owner may apply for post-grant amendment as stated in Subparagraph 1 or 2, Paragraph 1 of Article 67 without the consent from all the joint owner(s).