Sonderhoff & Einsel Patent Law Office
ゾンデルホフ＆アインゼル法律特許事務所
Sonderhoff & Einsel Patent Law Office is a Japan-based patent law firm with 48 years of recorded international activity (1978–2025). 19,873 total international patent cases are on record, spanning 4 foreign jurisdictions and 1,041 distinct corporate applicants. Sign in to open the complete partner network, year-by-year activity, decision-maker analysis, and named client relationships.
- International cases
- 19,873
- Last 5 years
- 855
- Applicants
- 1,041
- 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
- Sonderhoff & Einsel Patent Law Office · Japan
- Window
- 2017–2025
- As of
- Recorded activity through 2025
- Unit
- International exchange cases
View annual counts
| Year | International cases |
|---|---|
| 2017 | 284 |
| 2018 | 204 |
| 2019 | 415 |
| 2020 | 426 |
| 2021 | 356 |
| 2022 | 521 |
| 2023 | 239 |
| 2024 | 92 |
| 2025 | 3 |
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 Sonderhoff & Einsel Patent Law 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.