https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/japan/sources-information/where-can
Where can I search Japanese patent information in English?
You can search this information on the English web pages of the Japan Platform for Patent Information (J-PlatPat). J-PlatPat offers English-language databases for all major intellectual property rights, English abstracts for Japanese patent applications, basic legal status information and English machine translations. See also our step-by-step guides to searching on J-PlatPat.
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