Why Foreign Companies Should Get a Patent in Japan: Benefits Explained by a Japanese Patent Attorney

"We already have a patent in China. Do we really need one in Japan?" "Is a Japanese patent worth it for a mid-sized manufacturer?"

Our honest answer: if you sell, manufacture or license your product in Japan, the real question is not whether a Japanese patent is worth having — it is what happens when a competitor copies you there and you have no right to stop them.

In this article, Japanese Patent Attorney Toru Kano of BrandAgent (Kyoto) explains the practical benefits of a Japanese patent for overseas companies, why structural patents are particularly strong, and how to bring your invention into Japan.

Your home-country patent does not work in Japan

Patents are territorial. A patent granted in China, Korea, Taiwan, the US or Europe has no effect in Japan. If a competitor makes, sells or imports a copy of your product in Japan, you can only stop them with a Japanese patent (or Japanese utility model).

This matters for many overseas companies:

• E-commerce sellers on Amazon Japan, Rakuten or Yahoo! Shopping whose best-selling product is copied by other sellers.
• B2B suppliers selling machines, parts or materials to Japanese manufacturers.
• OEM / ODM manufacturers whose designs could be reproduced by another factory for the Japanese market.
• Technology owners who want to license their invention to a Japanese partner.

Four benefits of a Japanese patent

① Legally stop copies — structural patents are especially strong

The core purpose of a patent is to stop others from using your invention without permission. In Japan, the patent owner has the exclusive right to work the patented invention, including making, using, selling and importing the patented product, and can seek an injunction and damages against an infringer.

We want to emphasise one practical point: structural patents — patents on the structure of a product, the arrangement of its parts, or the combination of mechanisms — are particularly effective.

A Japanese patent owner can also apply to Japan Customs to have infringing goods stopped at import. For companies whose competitors manufacture abroad and ship into Japan, this is a valuable tool.

② Prove your technology to Japanese customers and partners

A patent is granted only after the Japan Patent Office (JPO) examines whether the invention is new and involves an inventive step. The patent is published, so anyone can check the owner, the inventors and the technology.

Japanese companies tend to value objective evidence when choosing suppliers and partners. A Japanese patent is a public record that tells customers, distributors and investors, "this technology is ours, and competitors cannot easily copy it."

③ Earn income through licensing or assignment

A patent is not only a right to use your invention — it is also a right to let others use it (licensing) and to sell it (assignment).

For overseas companies without their own sales network in Japan, licensing a Japanese patent to a local manufacturer or distributor can be a way to earn royalties in the Japanese market without building a factory or office. A Japanese patent can also be sold if you later withdraw from the market.

④ Stand out from competitors and avoid price wars

A patent lets you show the market that a particular function or structure is available only from you. Customers who value that feature are less likely to switch to a cheaper copy, which helps you avoid price competition.

The existence of a patent also acts as a deterrent. A competitor who knows "this might infringe" will often think twice before launching a similar product, even if no lawsuit is ever filed.

How to bring your invention into Japan

Overseas applicants usually enter Japan through one of the following routes. An applicant without a domicile or office in Japan must file and handle all procedures through a representative in Japan — in practice, a Japanese patent attorney.

Your application must be translated into Japanese. The quality of this translation directly affects the scope of your Japanese patent, so it should be reviewed by someone who understands both the technology and Japanese patent practice.

After filing, a request for examination must be filed within 3 years of the Japanese filing date; otherwise the application is deemed withdrawn. If you already have an allowed patent in another office, the Patent Prosecution Highway (PPH) can be used to speed up examination in Japan.

A Japanese utility model protects the shape, structure or combination of articles. It is registered without substantive examination, so it is obtained quickly and at lower cost, but its term is shorter (10 years from filing), and before enforcing it you must obtain and present a technical opinion from the JPO. It can be a practical option for simple structural products.

Points to check before you file

FAQ

• Q. We have a Chinese patent. Does it protect us in Japan?
  A. No. Patents are territorial. To stop copies in Japan you need a Japanese patent or utility model.
• Q. Can we file in Japan directly without a Japanese attorney?
  A. An applicant with no domicile or office in Japan must use a representative in Japan for filing and all later procedures — in practice, a Japanese patent attorney.
• Q. How long does a Japanese patent last?
  A. Up to 20 years from the filing date, provided the annual fees are paid. (Extension is possible in limited fields such as pharmaceuticals.)
• Q. Is a utility model enough?
  A. For simple structural products it can be a fast, low-cost option, but it is shorter (10 years) and requires a JPO technical opinion before enforcement. We recommend discussing it case by case.
• Q. Can we communicate in English or Chinese?
  A. Yes. We handle inquiries in English and Chinese.

Summary

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• How to Get a Patent in Japan as a Foreign Applicant: Documents, Routes and Process
• How Much Does a Japanese Patent Cost? Official JPO Fees for Foreign Applicants (2026)
• Patent Infringement in Japan: How to Check Your Risk and Respond to a Warning Letter
• Trademark vs Patent vs Design vs Copyright in Japan: What Each One Protects