Japan Utility Model Technical Evaluation Report: Enforcement Risks and Converting to a Patent

"We found copies of our product in Japan — can we send a warning based on our utility model?" "What is a technical evaluation report?" "Can we still turn our Japanese utility model into a patent?"

A Japanese utility model is registered quickly and cheaply, but the rules for using it against infringers are very different from a patent. Many overseas right holders discover this only when they try to stop a copycat on Amazon Japan or in a Japanese distribution channel. In this article, Japanese Patent Attorney Toru Kano of BrandAgent explains the technical evaluation report, the enforcement risks under the Utility Model Act, and the options for converting between a utility model and a patent.

*Official fees are those listed on the JPO fee list (checked November 2026).

What is a technical evaluation report?

A Japanese utility model is registered without examination of novelty or inventive step. Registration alone therefore tells you nothing about whether the right would survive a challenge.

The technical evaluation report (jitsuyo shinan gijutsu hyokasho) fills that gap. On request, a JPO examiner searches the prior art and evaluates whether the registered device is novel, involves an inventive step and meets certain other requirements. Think of it as the examiner's objective opinion on validity. It is not a final decision on validity, but it is the document that Japanese law requires before a utility model can be enforced.

Who can request it, and when?

Anyone can request a technical evaluation — not only the right holder — and there is no time limit. A company that receives a warning based on a competitor's utility model, for example, may request one to check whether the right is really valid. When a third party files a request, the right holder is notified.

Official fee

*Attorney fees are not included. For a utility model based on a PCT international application, a lower fee applies, depending on which office prepared the international search report.

Compared with the JPY 20,600 due at filing for a one-claim utility model, the evaluation fee is significant, so build it into your budget if enforcement in Japan is a realistic possibility.

Step 1 of enforcement: warn with the report (Article 29-2)

Under Article 29-2 of the Utility Model Act, the owner of a utility model may not exercise the right against an infringer until it has given a warning presenting a technical evaluation report. This applies to injunctions and damages claims alike. In practice, enforcement follows this sequence:

• 1. Request the report if you do not already have one.
• 2. Read the evaluation carefully: has novelty or inventive step been denied for the relevant claims?
• 3. Send a warning letter to the infringer, enclosing a copy of the report.
• 4. Negotiate or sue if the infringer does not respond.

With a patent, you can go straight to a warning or a lawsuit. With a utility model, the report always comes first, and preparing it takes time — so if speed matters, start early.

Liability if the utility model is invalidated (Article 29-3)

If the owner enforces a utility model or sends a warning, and the registration is later invalidated, the owner is liable to compensate the other party for the damage caused by the enforcement or warning (Article 29-3). If a Japanese distributor stopped selling a product because of your warning and the right is then invalidated, for instance, you could be ordered to pay for its lost sales.

The owner is not liable if it acted with reasonable care. Under the Act, acting on the basis of a favorable technical evaluation — one that did not deny registrability — is one way of showing reasonable care. Even so, do not treat a good report as a guarantee: check whether there is relevant prior art the report did not cite before you act.

For foreign right holders this point is particularly important. The rules differ from those in many other countries, including China, where a utility model patent evaluation report plays a different role. Do not assume your home-country enforcement playbook can be applied in Japan as is.

Timing: the report can close the door to a patent

There is a strategic catch: once the right holder itself requests a technical evaluation, it can no longer file a patent application based on the utility model registration. If you might want to upgrade to a patent, think carefully before requesting the report. And if you have no plans to enforce or convert, you do not need a report at all.

Converting a utility model into a patent (Patent Act, Article 46-2)

A common strategy is to secure a fast utility model first and switch to a stronger patent if the product succeeds. Japanese law allows this through a patent application based on a utility model registration.

This two-step strategy combines early protection with a later, examined right. The trade-off is that you give up the utility model and wait for patent examination. Watch the 3-year deadline and decide early.

Converting a patent application into a utility model

The reverse is also possible. If a patent application is struggling in examination — for example, because the examiner doubts inventive step — it can be converted into a utility model application within 9 years and 6 months of the patent filing date, but not after 3 months from receiving the first decision of refusal.

The converted application keeps the original filing date. Remember, however, that a utility model lasts 10 years from that date, so the remaining term may be short, and only subject matter relating to the shape, structure or combination of articles can be carried over.

Practical tips for foreign right holders

FAQ

• Q. Can we send a warning letter without a technical evaluation report?
  A. Exercising the right — injunction or damages — requires a prior warning presenting the report. A strong warning without it does not meet that requirement and can create disputes, so it is best avoided.
• Q. How much does the report cost?
  A. JPY 42,000 + JPY 1,000 × claims in official fees (JPY 43,000 for one claim), plus attorney fees. PCT-based utility models qualify for a lower fee.
• Q. We received a warning based on a Japanese utility model. What should we do?
  A. Check whether a technical evaluation report was enclosed and what it says. Anyone can request an evaluation, so if no report was provided or its conclusion is doubtful, consult a Japanese patent attorney.
• Q. Until when can we convert our utility model into a patent?
  A. Within 3 years of the utility model filing date, provided conditions are met — notably that no technical evaluation has been requested. The utility model right is abandoned.
• Q. Can we work with you in English or Chinese?
  A. Yes. Every case is handled personally by a licensed Japanese patent attorney, in English or Chinese, with payment by bank transfer or PayPal (in JPY).

Related articles

• Utility Model vs Patent in Japan: Which Should Foreign Applicants Choose?
• Japan Utility Model Cost and Procedure (2026): Official JPO Fees, Timeline and Filing Tips
• Patent Infringement in Japan: How to Check Your Risk and Respond to a Warning Letter
• How to Get a Patent in Japan as a Foreign Applicant: Documents, Routes and Process