Mr. Joginder Singh discusses on Serial filing of divisional patent applications in India in his latest article, which can be viewed on India Business Law Journal https://www.vantageasia.com/serial-filing-divisional-patent-applications-india/

The presence of multiple inventions in a parent application is an essential criterion for granting divisional patents in India. Divisional applications can be filed at any time before the grant of the parent application either voluntarily or in response to an objection based on lack of unity during the examination of the parent application.

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