Taiwan: Patent Act introduces tight time limits in invalidation proceedings

Managing IP is part of Legal Benchmarking Limited, 1-2 Paris Gardens, London, SE1 8ND

Copyright © Legal Benchmarking Limited and its affiliated companies 2025

Accessibility | Terms of Use | Privacy Policy | Modern Slavery Statement

Taiwan: Patent Act introduces tight time limits in invalidation proceedings

In an attempt to improve examination efficiency, the amended Patent Act which took effect from November 1 2019 now prescribes tight time limits for the invalidation petitioner to file additional reasons and evidence after filing an invalidation action and the patentee to file a counter-statement or a claim amendment. This will inevitably affect the strategies that the two opposing parties may use during the proceedings of an invalidation action.

According to the amended Patent Act, supplementary reasons or evidential materials can be submitted to the IP office only within three months from the filing date of an invalidation action. The legal rationale underlying this amendment is to prohibit the invalidation petitioner from intentionally prolonging the process of an invalidation action by submitting supplementary reasons or evidence in an exhaustive manner. By the same token, the patentee is given a one-month time limit to file a counter-statement against an invalidation action, along with a post-grant amendment, if any. This one month time limit also applies when (i) the invalidation petitioner is invited by the IP office to submit his comments on a post-grant amendment as filed; and (ii) either of the opposing parties is invited to render his opinion so as to remove any of the doubts raised by the IP office regarding the reasons or evidence on file. Time extensions are available only if they are accompanied by justifiable reasons and are subject to the approval of the IP office.

The amended Patent Act also mandates that the patentee is allowed to file post-grant amendments only within the one-month time limit prescribed to submit the counter-statement, or upon receipt of a notification from the IP office that the claim amendment filed with the counter-statement has been rejected, unless the patent at issue is the subject of a merit lawsuit.

In view of the time limits prescribed in the amended Patent Act, both the invalidation petitioner and the patentee are placed under a tight schedule and time pressure. Consequently, it is possible that an invalidation petitioner may not have a chance to submit his comments on the counter-statement filed by the patentee and a patentee may need to consider whether to conduct "claim amendments" as a counter-measure at a very early stage in an invalidation action. In other words, either party may be pushed to lay all their cards on the table in one go so as to increase the chances of success.

However, if viewed from another perspective, it seems that there is still room for the two opposing parties to map out their winning strategies under the severe atmosphere of a one-off showdown. For instance, the process of an invalidation action can be dragged on by requesting interviews or oral hearings, not to mention that the invalidation petitioner is allowed to file multiple invalidation actions so long as the "res judicata" doctrine is observed. Therefore, it is worth observing closely how invalidation cases will play out under the tight time limits imposed by the new amended Patent Act.

wu-junyan.jpg

Jun-Yan Wu


Saint Island International Patent & Law Offices7th Floor, No. 248, Section 3Nanking East RoadTaipei 105-45, Taiwan, ROCTel: +886 2 2775 1823Fax: +886 2 2731 6377siiplo@mail.saint-island.com.twwww.saint-island.com.tw

more from across site and SHARED ros bottom lb

More from across our site

Swati Sharma and Revanta Mathur at Cyril Amarchand Mangaldas explain how they overcame IP office objections to secure victory for a tyre manufacturer
Claudiu Feraru, founder of Feraru IP, discusses the benefits of a varied IP practice and why junior practitioners should learn from every case
In the ninth episode of a podcast series celebrating the tenth anniversary of IP Inclusive, we discuss IP & ME, a community focused on ethnic minority IP professionals
Firms that made strategic PTAB hires say that insider expertise is becoming more valuable in the wake of USPTO changes
Aled Richards-Jones, a litigator and qualified barrister, is the fourth partner to join the firm’s growing patent litigation team this year
An IP lawyer tasked with helping to develop Brownstein’s newly unveiled New York office is eyeing a measured approach to talent hunting
Amanda Griffiths, who will be tasked with expanding the firm’s trademark offering in New Zealand, says she hopes to offer greater flexibility to clients at her new home
News of EasyGroup failing in its trademark infringement claim against ‘Easihire’ and Amgen winning a key appeal at the UPC were also among the top talking points
Submit your nominations to this year's WIBL EMEA Awards by February 16 2026
Edward Russavage and Maria Crusey at Wolf Greenfield say that OpenAI MDL could broaden discovery and reshape how clients navigate AI copyright disputes
Gift this article