Timing of Filing Divisional Applications in Taiwan

In the patent filing process, applicants may need to file divisional applications in response to address unity of invention concerns raised or expedite securing protection of allowable claims. Therefore, it is essential for applicants to understand when to file a divisional application and what to be aware of during the process.

Taiwan's patent system adopts a relatively lenient attitude towards filing of divisional applications for inventions. In other words, so long as the parent application is pending or is within three months of receiving the notice of allowance, whether it is an originally filed application or an application that has already been divided, it can serve as the basis for filing a divisional or sub-divisional application, taking advantage of the priority or filing date of the parent application. In other word, for cases that have received a final Office Action, since the examination process has finalized, a divisional application can no longer be filed.

Furthermore, according to the Patent Act, a divisional application cannot go beyond the description or drawings of the parent application and what is claimed should not be identical to the inventions called for in the approved claims of the parent application.

If a divisional application is filed during the pendency of the parent application, the examination of the divisional application continues from the procedure left unfinished in the parent application. To be more specific, if a divisional application is filed during the preliminary examination stage of the parent application, the examination of the divisional application will start from the preliminary examination stage. If the divisional application is filed when the parent application has already entered the re-examination stage, the divisional application will directly enter the re-examination stage.

The difference between starting the examination of a divisional application from the preliminary examination stage and starting from the re-examination stage mainly lies in the number of opportunities for the applicant to respond to the rejection by the IPO.  If a divisional application is filed during the preliminary examination stage, the applicant will have at least three opportunities to file arguments or amendments, namely, against the first  examination opinion pre-notification in the form of an Official Letter, the first formal Office Action and the re-examination opinion pre-notification (an Official Letter.)  On the other hand, if a divisional application is filed during the re-examination stage, the applicant may only have one opportunity to respond, specifically, to the re-examination opinion pre-notification. If the rejection cannot be overcome, the applicant will receive a final Office Action.  In that case, there will be no further opportunities for division.

The following diagram illustrates the different stages of a divisional application in Taiwan which enters either the preliminary examination or the re-examination stage, depending on the timing of filing the divisional. This information is provided to help applicants decide, of their own, the most appropriate time to file divisional applications so as to better plan their patent filing strategies.

The above contents are intended as general discussion of the subject matter only and shall not be deemed as legal advice to any particular case or issue.