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Each patent family is counted once within a country direction and filing year. Counts are added across the selected years; the same family can appear in another direction or year.
Corridor family volume covers observed filings between the selected offices, including families without linked counsel. Firm relationships are a narrower population requiring identifiable representatives on both sides. IP5 support does not mean every filing 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.
More inbound activity
More inbound activity
More inbound activity
More inbound activity
From mostly inbound activity in the early 1990s to more outbound than inbound with the United States by 2022. This is the story of a national IP network rebalancing itself, told corridor by corridor.
In 1990, KR firms received 3.13K cases from the United States and sent only 1.45K back. The corridor was structurally one-sided. Across all four IP5 partners, the same pattern held: KR was a destination for foreign work, almost never a source.
The numbers tell a quiet story about a national IP infrastructure still maturing. Korea firms were filing patents abroad in tiny numbers, and KR firms were rarely chosen as the entry point for foreign filers' KR strategy. Volume rose steadily through the decade, but the direction never changed.
By 1999, KR received roughly 8 cases for every 1 it sent. Exchange balance wasn't bad — it was barely a concept yet.
Two corridors differed from this inbound pattern. EP saw the highest relative outflow — KR firms were already engaging with European counsel two-way. CN was nearly invisible: fewer than 1.5K combined exchanges per year throughout the decade.
The 2000s opened with a brief contraction, but by 2006 the corridor was a different shape entirely. Inflow exploded. KR firms received 17.7K cases from CN in 2006 alone — an order of magnitude above the 1990 baseline.
Outflow rose too, but on a slower clock. KR sent meaningful numbers to EP — a real two-way relationship there — but to the US the asymmetry stayed asymmetric. The relationship just moved more cases through it.
Roughly 3.5× more inflow than outflow at the decade's close. KR had growing inbound activity, with inbound still exceeding outbound.
This was the decade Korea industry exported its first global wave. Corporate patents went to the US, EP and JP through American, European and Japanese counsel. The KR firm's role in that flow was downstream — receiving foreign filings, drafting, prosecuting, returning. Not yet a sender.
Around 2022, something quietly historic happened. KR's outflow to the United States crossed US's outflow to KR. For the first time in 25 years, KR firms sent more cases to the United States than US firms sent to KR. The crossover wasn't dramatic — but it was real, and it stuck.
By 2019 the gap was decisive. KR had more outbound than inbound in its largest corridor, after 25 years of more inbound activity.
After 25 years of more inbound activity, this became the first corridor where KR had more outbound activity.
The other corridors shifted with it, just at different speeds. EP rebalanced near 1:1 by mid-decade. JP closed the gap but still had more inbound activity. CN went from invisible to balanced. By 2019, it was already exchanging multiple thousand cases each direction, an order of magnitude bigger than 2009.
The four corridors that defined Korea's IP5 relationships have settled into 1 balanced exchange, 3 where the partner has more outbound than inbound. Each tells a different story about what KR can offer — and what it asks for.
Click any corridor to drill into its full single-corridor brief — top firms, applicants, technology focus, and decision-maker patterns.
Each corridor's deep brief is one click away. Or open the partner finder to start outreach in a specific corridor.
KR-anchored corridor brief · 1990 – 2024 series