Ideas are everywhere. But protecting them? That’s where the real story begins.
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Today’s discussion revolves around a deceptively simple yet extremely important question: Can a divisional application be filed after the patent for the parent application has already been granted?
The right time to file a divisional application is any time during the pendency of the parent patent application, before the patent is granted. It can be filed either proactively by the applicant or in response to a unity of invention objection raised during examination. Once the parent patent is granted, the opportunity to file a divisional application is no longer available.
At first glance, many might assume the answer is flexible. After all, if the invention is disclosed and the applicant had always intended to divide it, why should a small delay matter? However, the Delhi High Court’s 2026 decision tells us that in patent law, statutory timelines are not suggestions; they are boundaries.
The case arose from a patent application filed in May 2021. During examination, the Patent Office raised an objection under Section 10(5) of the Patents Act, stating that the claims appeared to relate to more than one invention. Basically, the Controller believed the application might contain multiple inventions that were not linked by a single inventive concept. When such an objection is raised, applicants typically have two options: they may argue that the claims indeed share a common inventive concept, or they may choose to file a divisional application to separate the inventions.
In this case, the applicant chose to argue. Responses were filed, a hearing was conducted, and written submissions were submitted defending the unity of invention. During the course of submissions, the applicant stated that if the Controller believed the claims represented distinct inventions, they would be willing to pursue one set of claims in a divisional application. However, this was framed as a conditional willingness, not an actual filing.
The Controller eventually accepted the applicant’s arguments. All objections were waived. The patent was granted on 26 July 2024
Five days after the grant of a patent, the applicant attempted to file a divisional application.
The system did not allow it.
Why?
Because Section 16 of the Patents Act, 1970, clearly states that a divisional application may be filed “at any time before the grant of the patent.” The language is direct and unambiguous. The Court emphasized this exact phrase. Once the patent is granted, the statutory window closes.
The applicant approached the High Court, arguing that the grant happened abruptly and without notice, effectively depriving them of the opportunity to file the divisional. They contended that they had orally indicated their intention and that a further hearing had been expected. However, the Court carefully examined the record and found that the applicant had never actually filed a divisional application before the grant date. The expression of willingness to file one “if required” was only a conditional statement made during arguments. Since the Controller ultimately agreed with the applicant and found unity of invention, the condition never arose.
The Court further clarified that the responsibility to file a divisional lies entirely with the applicant.
The law does not require the Controller to warn an applicant before granting a patent. Under Section 43 of the Indian Patents Act, 1970, once an application is found to be in order, the patent shall be granted as expeditiously as possible.
There is no statutory requirement to give advance notice of a grant. Therefore, the argument that the grant was “sudden” could not override the clear wording of Section 16.
One of the most significant observations of the Court was that statutory rights in patent law operate strictly within statutory limits. Equity or intention cannot extend a deadline that the statute itself clearly fixes.
The Court held that once the patent was granted, finality attached to the application, and the right to file a divisional ceased to exist.
This judgment serves as a powerful lesson in prosecution strategy. Many applicants believe they can wait until the Controller insists on a division before actually filing one. Others assume that as long as the matter is under discussion, the window remains open. This decision makes it clear that the safest course, if division is strategically important, is to file it before the grant, not after the arguments conclude.
For those new to patent law, imagine this situation like boarding a flight. The boarding gate remains open until departure. You may discuss your seat, your luggage, or your preferences, but once the gate closes, no amount of explanation about your intention to board will help. Section 16 functions in the same way. The “gate” closes on the date of the grant.
The Delhi High Court ultimately dismissed the petition.
It found no illegality in the Controller’s actions and no violation of natural justice. The applicant had over three years between filing and grant to exercise the option of division, but chose not to do so. The Court declined to reopen what had already closed.
The broader takeaway from this case is not merely about divisional applications. It is about the importance of proactive decision-making in patent prosecution.
Patent law rewards timely action. Strategic hesitation can lead to irreversible consequences.
In The Patent Room™, we often say that patents are as much about timing as they are about technology. This judgment reinforces that principle in the clearest possible way.
Once the patent is granted, the door to division is no longer ajar; it is firmly shut.
But The Patent Room™ remains open, and the lessons continue.
