Kaiyu International Patent Office
特許業務法人快友国際特許事務所
Kaiyu International Patent Office is a Japan-based patent law firm with 44 years of recorded international activity (1978–2021). 1,158 total international patent cases are on record, spanning 4 foreign jurisdictions and 114 distinct corporate applicants. Sign in to open the complete partner network, year-by-year activity, decision-maker analysis, and named client relationships.
- International cases
- 1,158
- Last 5 years
- 0
- Applicants
- 114
- Flow type
- Incoming-heavy
Sent plus received relationship cases on this firm’s public profile. Can differ from the directory index. As of 2021.
Activity trend (last 10 years)
- Scope
- Kaiyu International Patent Office · Japan
- Window
- 2017–2021
- As of
- Recorded activity through 2021
- Unit
- International exchange cases
View annual counts
| Year | International cases |
|---|---|
| 2017 | 32 |
| 2018 | 12 |
| 2019 | 15 |
| 2020 | 14 |
| 2021 | 5 |
Top international partners
Similar Japan firms
Global firm case index used for directory ranking. Not the same as a profile’s international exchange total.
Locked in the full profile
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Decision-maker split
Firm-chosen vs applicant-chosen foreign counsel, when tagged.
Full partner list
Every observed counterpart, not only the public top five.
Named clients
Applicant relationships behind the exchange counts.