Taiwan Trademark Law has a post-registration opposition system, allowing any third party to file an opposition action against a registered trade mark during the three months after registration. Once the mark is revoked, the mark is deemed not to have been registered ab initio. Also according to the law, the Trademark Office may, ex officio or upon request, cancel a registered trade mark if the mark has not been put to use or its use has discontinued for three years without a justifiable reason.
