IP-Academy

Unity of invention

Unity of Invention

Most jurisdictions, European Patent Office (EPO) for instance, a patent application is usually allowed to cover only one invention, or a group of inventions that share the same main inventive idea. The basic principle is that one application should normally result in one patent for one invention.

This rule exists to prevent applicants from including several unrelated inventions in a single application while paying only one set of fees. It also makes it easier for patent offices to organize and classify patent documents.

During the examination process, the Intellectual Property Office may raise what is called a “unity of invention” objection if they believe the claims in the application relate to more than one separate invention.

If this happens, it is not something to panic about. A unity of invention objection is a common part of the patent process and does not mean that your patent application will be rejected.

There are several ways to resolve the issue. The claims can be adjusted so that they clearly relate to one main invention. It is also possible to provide a technical explanation showing that the inventions are actually linked and share the same inventive concept. Another option is to remove the additional claims and file them in a separate divisional application if protection for the second invention is still desired.

It is also important to remember that rules and examination procedures related to unity of invention can vary between jurisdictions. For this reason, it is often helpful to consult a patent attorney who can advise on the specific requirements in the countries where you plan to file your patent application. Services such as IP-Coster can help connect you with qualified patent attorneys and provide information about the requirements in different jurisdictions, making it easier to manage the patent filing process internationally.

 

Common Questions

How should I decide which invention to keep in the main application?

Keep the invention that best matches your product's revenue driver, is hardest for competitors to design around, and is most likely to clear novelty/inventive step based on the search results.

Should I respond with an argument first, or amend claims immediately?

If you have a strong common feature tying all claims together, argue unity first (it can preserve scope). If the claim sets are genuinely different, amending early can save time and reduce the risk of repeated unity objections later.

Can a unity objection affect timelines (e.g., grant speed)?

Yes. If you amend heavily or split into a divisional, you may add an extra cycle of examination and correspondence. The fastest route is usually to align the claims to one clearly unitary concept.

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