Sakai International Patent Office
弁理士法人酒井国際特許事務所
Sakai International Patent Office is a Japan-based patent law firm with 49 years of recorded international activity (1978–2026). 22,621 total international patent cases are on record, spanning 4 foreign jurisdictions and 1,921 distinct corporate applicants. Sign in to open the complete partner network, year-by-year activity, decision-maker analysis, and named client relationships.
- International cases
- 22,621
- Last 5 years
- 1,498
- Applicants
- 1,921
- Flow type
- Incoming-heavy
Sent plus received relationship cases on this firm’s public profile. Can differ from the directory index. As of 2026.
Activity trend (last 10 years)
- Scope
- Sakai International Patent Office · Japan
- Window
- 2017–2026
- As of
- Recorded activity through 2026
- Unit
- International exchange cases
2026 is a partial year. Latest counts are provisional and should not be compared to a complete year.
View annual counts
| Year | International cases |
|---|---|
| 2017 | 241 |
| 2018 | 362 |
| 2019 | 1,043 |
| 2020 | 1,203 |
| 2021 | 825 |
| 2022 | 886 |
| 2023 | 356 |
| 2024 | 249 |
| 2025 | 6 |
| 2026 · partial | 1 |
Top international partners
Similar Japan firms
Global firm case index used for directory ranking. Not the same as a profile’s international exchange total.
- SUZUYE & SUZUYE弁理士法人鈴榮特許綜合事務所 (届出番号:G0386)21,901 index cases
- Nakamura Joint Patent & Law Office Tokyo中村合同特許法律事務所 東京21,158 index cases
- Yamamoto Patent山本特許法律事務所20,729 index cases
- ITOH International Patent Office弁理士法人ＩＴＯＨ (届出番号:G0458)25,242 index cases
- Sonderhoff & Einsel Patent Law Officeゾンデルホフ＆アインゼル法律特許事務所19,889 index cases
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.