divisional application

A divisional patent application (sometimes referred to as a divisional application or simply a divisional) is a type of patent application which contains matter from a previously-filed application (the "parent" application). Whilst a divisional application is filed later than the parent application, it may retain its parent's filing date, and will generally claim the same priority.
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a later application for an independent or distinct invention disclosing and claiming (only a portion of and) only subject matter disclosed in the earlier or parent application.

--see MPEP 201.06 for more

Context: Patent