What procedures are available to challenge the validity of a Patent in Vietnam outside of the courts?

The following procedures could be proceeded to challenge the validity of Patent outside of the courts:

Re-examination proceeding can be filed by a third party at the National Office of Intellectual Property of Vietnam (NOIP). In that case, the third party shall file arguments, legal bases and other proofs for invalidating of Patent. NOIP could arrange the meeting between third party and Owner of Patent.

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