Patent and non-patent literature
How to find Japanese patent?

Depending on your purpose, Japanese patent information can be found from following sources.
Available Japanese patent databases:
Japanese

English

Search strategies
You may want to use classifications (IPC, F-Term, File Index), keyword strings and combination to search Japanese patents. Let’s use IPDL database provided by JPO as examples to illustrate the search screens.

    F-term or FI classification search
    You can find Japanese patents by using F-term and/or FI:
    Using F-term and/FI

    Example: please refer to the screenshot below.
    find patent by using F-term and/or FI

    Find patent from number
    You can easily get Japanese patent document if you have already had a number:
    Find document from number

    Screenshot:
    find from number

Japanese searchers

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