https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/japan/sources-information/where-2
Where can I find legal status information on Japanese patents in English?
You can find basic legal status information on Japanese documents free of charge via the Japan Platform for Patent Information (J-PlatPat) of the Japan Patent Office. For each IP right, J-PlatPat offers a summary of the most important legal status events up to grant or refusal, in chronological order. You can find a step-by-step guide on how to retrieve legal status information in J-PlatPat on our website.
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