OHTSUKA PATENT OFFICE
弁理士法人大塚国際特許事務所
OHTSUKA PATENT OFFICE is a Japan-based patent law firm with 48 years of recorded international activity (1978–2025). 10,466 total international patent cases are on record, spanning 4 foreign jurisdictions and 303 distinct corporate applicants. Sign in to open the complete partner network, year-by-year activity, decision-maker analysis, and named client relationships.
- International cases
- 10,466
- Last 5 years
- 820
- Applicants
- 303
- Flow type
- Incoming-heavy
Sent plus received relationship cases on this firm’s public profile. Can differ from the directory index. As of 2025.
Activity trend (last 10 years)
- Scope
- OHTSUKA PATENT OFFICE · Japan
- Window
- 2017–2025
- As of
- Recorded activity through 2025
- Unit
- International exchange cases
View annual counts
| Year | International cases |
|---|---|
| 2017 | 148 |
| 2018 | 121 |
| 2019 | 474 |
| 2020 | 635 |
| 2021 | 501 |
| 2022 | 478 |
| 2023 | 185 |
| 2024 | 151 |
| 2025 | 6 |
Top international partners
Sends cases to
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
This public page is a preview. Sign in to open the complete partner network, year-by-year activity, and decision-maker analysis for OHTSUKA PATENT OFFICE.
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.