J-PlatPat Japan Patent, Trademark & Design Crawler

Searches J-PlatPat, the Japan Patent Office's official database, and returns patents, utility models, trademarks and designs as clean JSON. Japan files roughly 300,000 patent applications a year, and until now none of it was one input form away.

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J-PlatPat Crawler Features

• Searches patents and utility models by keyword, applicant, inventor, FI/IPC classification code or filing-date window.
• Looks up a single patent application by number.
• Returns patent inventors, IPC codes, claims count, abstract, registration date and priority claim alongside the search hit.
• Searches trademarks by mark or owner, with a Nice class filter.
• Searches designs by article or owner.
• Links every patent back to its J-PlatPat document page.
• Reaches past the 3,000-row display ceiling on patent searches by splitting the query across filing dates, so a broad query still returns everything it matches.

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Who needs Japanese patent data?

• IP counsel and patent agents — Prior-art and freedom-to-operate checks against Japanese filings, exported rather than copied from a results screen.
• R&D and competitive intelligence teams — Track what a competitor files in a classification code, quarter by quarter.
• Trademark and brand teams — Check a mark and its Nice class against the Japanese register before launch.
• Analysts and researchers — Build filing-trend datasets by applicant, technology class or year.
• Licensing and M&A teams — List a target's patent portfolio with inventors and classification codes.

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How J-PlatPat Crawler Works

1. Pick a search type: patent (patents and utility models), trademark or design.
2. Set the filters that apply. Keywords are separated by spaces and must all match, up to four.
3. Run it. Patent hits come back newest filing first, enriched with inventors, IPC codes, claims count and abstract unless you turn details off.
4. Download the dataset as JSON, CSV or Excel.

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Input

{
    "searchType": "patent",
    "searchQuery": "量子",
    "searchField": "title",
    "applicant": "",
    "ipcCode": "G06N",
    "dateFrom": "2025-01-01",
    "dateTo": "2025-12-31",
    "fetchDetails": true,
    "maxItems": 50
}

Field	Type	Default	Description
searchType	string	patent	patent (patents and utility models), trademark or design.
searchQuery	string		Keywords separated by spaces, all must match, up to four. Japanese text works best.
searchField	string	full_text	Patents only. Where the keywords must appear: full_text, title, abstract or claims.
applicant	string		Applicant or owner name in Japanese, partial names match. Trademarks and designs use it as the search when no query is set.
inventor	string		Patents only. Inventor name in Japanese, partial names match.
ipcCode	string		Patents only. Classification code or prefix, for example H04L or G06N10/40.
applicationNumber	string		Patents only. One application, for example 2024-123456 or JP2024-123456. Overrides the other patent filters.
niceClass	string		Trademarks only. Keep only marks in this Nice class (1 to 45).
dateFrom	string		Earliest filing date, YYYY-MM-DD.
dateTo	string		Latest filing date, YYYY-MM-DD.
fetchDetails	boolean	true	Patents only. Adds inventors, IPC codes, claims count, abstract, registration and priority data. Slower.
maxItems	integer	50	Maximum records to return.

A patent search needs at least one of query, applicant, inventor, classification code, application number or a date window. Trademark and design searches need a query or an applicant.

More examples:

{ "searchType": "patent", "applicant": "トヨタ自動車", "dateFrom": "2024-06-01", "dateTo": "2024-06-30", "maxItems": 200 }

{ "searchType": "trademark", "searchQuery": "ロボット", "niceClass": "9", "maxItems": 100 }

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J-PlatPat Crawler Output Fields

Patent record:

{
    "document_type": "Patent",
    "application_number": "2025-075820",
    "publication_number": "特開2026-171612",
    "registration_number": null,
    "title_jp": "構造パラメータに基づく量子情報処理装置",
    "applicant_jp": ["エコツーラボ合同会社"],
    "inventors": ["猪澤 也寸志"],
    "filing_date": "2025-04-12",
    "first_published_date": "2026-10-23",
    "status": "Published application",
    "fi_codes": ["G06N10/40"],
    "ipc_codes": ["G06N10/40"],
    "claims_count": 19,
    "source_url": "https://www.j-platpat.inpit.go.jp/c1801/PU/JP-2026-171612/11/ja"
}

Field	Type	Description
document_type	string	Patent, Utility Model, Trademark or Design.
application_number	string	Application number as YYYY-NNNNNN.
publication_number	string	Publication number of the unexamined application (patents).
registration_number	string	Registration or grant number in J-PlatPat's own notation.
title_jp	string	Title of the invention in Japanese (patents).
abstract_jp	string	Abstract in Japanese (patents, with details).
applicant_jp	array	Applicants or owners in Japanese.
inventors	array	Inventor names in Japanese (patents, with details).
filing_date	string	Filing date, YYYY-MM-DD.
first_published_date	string	Date of the earliest publication or gazette issue.
registration_date	string	Registration date (granted patents, with details; registered trademarks).
priority_date	string	Earliest claimed priority date (patents that claim priority, with details).
priority_country	string	Country code of the earliest priority claim.
status	string	Granted, Published application, Registered or Not registered.
fi_codes	array	FI classification codes (patents).
ipc_codes	array	IPC classification codes (patents, with details).
claims_count	number	Number of claims (patents, with details).
mark_text	string	Trademark text (trademarks).
mark_reading	string	Katakana reading of the trademark (trademarks).
classes	array	Nice classes as numbers (trademarks).
article_name	string	Article the design applies to (designs).
design_classification	string	Japanese design classification (designs).
source_url	string	Link to the document on J-PlatPat (patents).

Trademark and design records carry only the fields that apply to them.

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FAQ

Does J-PlatPat Crawler return English titles and abstracts?

J-PlatPat Crawler returns what the Japan Patent Office publishes, which is Japanese. Titles, abstracts, applicant and inventor names are in Japanese, and classification codes are language-neutral. English fields would be machine translation, so none are added.

How many records can one search return?

J-PlatPat Crawler has no row limit on patent searches: a query that matches more than 3,000 patents is split across filing dates until every slice fits, newest filings first. Trademark and design searches return up to the 3,000 most recent matches per query, so add terms or a date window for older records.

Can it look up a patent by number?

Yes. Set applicationNumber to something like 2024-123456. The number may carry a JP or 特願 prefix.

Why do some records lack inventors or an abstract?

J-PlatPat Crawler fills those from each document's own page, so they appear only when fetchDetails is on. Older utility models and some published applications do not carry every field, and the field is then empty.

What does status mean?

Granted means the patent has a registration number. Published application means it is published but not registered. Trademarks are Registered when they have a registration date and Not registered otherwise, which covers pending, refused and withdrawn applications.

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Need More Features?

Need extra fields, filters or a different Japanese register? File an issue or get in touch.

Why Use J-PlatPat Crawler?

• Three registers, one actor — Patents, utility models, trademarks and designs from the same official source, in one schema.
• Complete patent results — Searches wider than the 3,000-row ceiling are split by filing date, so nothing is silently cut off.
• Document-level detail — Inventors, IPC codes, claims count and abstract come with each patent, not just the search-hit columns.
• Ready for analysis — ISO dates, normalised application numbers and arrays for applicants, inventors and codes.