Analysis jurisdiction: JP
Firm family observations
1,493
Foreign Associates
401
Observed firm relationship shares
Sent share
40%
Received share
60%
Smaller / larger direction
67%
Observed volume trend
Increase
2020–2022 vs 2017–2019
2023–2026 are preliminary while filings publish; trends use complete years.
Shares cover only observed cross-border relationships with identifiable firms on both sides, not all foreign filing work. Missing or unlinked representatives are outside this denominator.
Sent share = sent ÷ (sent + received) × 100. Received share = received ÷ (sent + received) × 100. Rounded shares add to 100%; no observations is N/A.
These are filing-based associations, not confirmed instructions or work returned by a partner. Counts and direction can contain gaps or errors.
Smaller / larger direction = smaller flow ÷ larger flow × 100. One-way exchange is 0%; no activity is N/A. It describes observed balance, not who chose the partner.
Family observations count each family once per firm, filing office and year. A family can recur across offices or years; this is not a globally unique patent count. The total counts each family once within a firm, office and year, even if it appears in both directions. Sent plus received can exceed the total. These are not application counts.
These relationship metrics cover observed cross-border filings with identifiable representatives on both sides in the served sources. IP5 support does not mean every filing or representative is captured.
US representative evidence is limited to granted documents in the source; pre-grant filings without that evidence are absent from counsel relationships. This is a counsel-evidence limit, not a cutoff for corridor filing volume.
No observed relationship is not proof that the firms have never worked together. Missing representative evidence and unlinked identities can leave gaps.
894 received599 sent
Two-way exchange
Family observations count each family once per firm, filing office and year. A family can recur across offices or years; this is not a globally unique patent count.
These relationship metrics cover observed cross-border filings with identifiable representatives on both sides in the served sources. IP5 support does not mean every filing or representative is captured.
US representative evidence is limited to granted documents in the source; pre-grant filings without that evidence are absent from counsel relationships. This is a counsel-evidence limit, not a cutoff for corridor filing volume.
No observed relationship is not proof that the firms have never worked together. Missing representative evidence and unlinked identities can leave gaps.
People recorded for this firm in patent and trademark sources. A listing is not proof of current employment or a trademark qualification, and the same person can appear under name variants. Filing-year filters do not apply to the roster.
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A family can appear with more than one partner. Profile corridor breakdowns sum those partner observations and can exceed the firm family total.
Percentages use all 2,300 partner observations in the selected period, including corridors below.
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Compare activity and exchange using the same filing period.
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Tech Specializations
Description
IP CREW is a patent attorney firm based in Yokohama, Japan. It handles patent, utility model, design, and trademark filings, prosecution, trials, litigation, and foreign filings, with expertise in mechanical, electrical, and chemical fields. It serves small and medium-sized businesses and individuals.
Website
https://ip-crew.com/Founded
2003
Trademarks
IP Crew Patent Attorneys · JP · 43 observed families, 1990–2026