This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.
While divisional applications are typically filed in response to a restriction requirement, they can be filed voluntarily without one. The MPEP 201.06 states:
“A divisional application is often filed as a result of a restriction requirement made by the examiner.”
However, the use of “often” implies that this is not always the case. Applicants may choose to file a divisional application voluntarily if they:
- Recognize distinct inventions in their application
- Want to pursue different claim scopes separately
- Need to address potential unity of invention issues proactively
It’s important to note that voluntarily filing a divisional application without a restriction requirement may affect the application of the safe harbor provision under 35 U.S.C. 121, which protects against double patenting rejections in certain cases.
For more information on Divisional application, visit: Divisional application.