Sonderhoff & Einsel Patent Law Office
ゾンデルホフ＆アインゼル法律特許事務所
Public patent records for Sonderhoff & Einsel Patent Law Office, 1978–2025: 19,979 patent families shared with other firms for 1,041 clients (applicants). Sign in to explore the app’s partner network, selected filing periods, filing activity, and client relationships.
- Patent families shared with other firms
- 19,979
- 1978–2025. One family can be counted more than once.
- Activity 2016–2020
- 2,116
- Distinct families per year, summed over the last five complete years. 2021 onward is still being published.
- Clients (applicants)
- 1,041
- Applicants named on these families, all recorded years. Not a full client list.
- Firms shown below
- 5
Activity trend (2017–2026)
- Scope
- Sonderhoff & Einsel Patent Law Office · Japan
- Filing years
- 2017–2025
- Unit
- Distinct families per year
2021–2026 are preliminary. Patent filings publish about 18 months after filing, and foreign filings can enter later, so these counts are still filling in.
Each family counts once within a year. A family may recur in multiple years.
View annual counts
| Year | Distinct families per year |
|---|---|
| 2017 | 287 |
| 2018 | 209 |
| 2019 | 422 |
| 2020 | 427 |
| 2021 · preliminary | 359 |
| 2022 · preliminary | 526 |
| 2023 · preliminary | 255 |
| 2024 · preliminary | 93 |
| 2025 · preliminary | 3 |
Technology fields it focuses on
Fields where this firm's share of patent families is well above the average for Japan firms, 2018–2022.
| Field | Share of its families | vs Japan average |
|---|---|---|
| Devices for moving wings into open or closed position; checks for wings; wing fittings not otherwise provided for, concerned with the functioning of the wingIPC/CPC E05F | 2.2% | 13.0× |
| Vehicle brake control systems or parts thereof; brake control systems or parts thereof, in general; arrangement of braking elements on vehicles in general; portable devices for preventing unwanted movement of vehicles; vehicle modifications to facilitate cooling of brakesIPC/CPC B60T | 2.7% | 7.6× |
| Couplings for transmitting rotation; clutches; brakesIPC/CPC F16D | 2.5% | 6.3× |
| Chemical composition of glasses, glazes or vitreous enamels; surface treatment of glass; surface treatment of fibres or filaments made from glass, minerals or slags; joining glass to glass or other materialsIPC/CPC C03C | 3.4% | 4.6× |
| GearingIPC/CPC F16H | 2.3% | 4.2× |
Yearly counts for 2018–2022, added up: 3,565 of 5,044 families carry an IPC or CPC classification. Shares are of those classified families, and one family can fall in several fields.
Frequently associated firms
Firms that most often appear on the same patent families. One family can be counted more than once, so these are not unique totals.
Similar Japan firms
Yearly counts since 1990, added up. One family can be counted more than once.
- Yamamoto Patent山本特許法律事務所20,775 shared patent families
- Nakamura Joint Patent & Law Office Tokyo中村合同特許法律事務所 東京21,190 shared patent families
- Suzue International Patent Office弁理士法人スズエ国際特許事務所18,666 shared patent families
- Sakai International Patent Office弁理士法人酒井国際特許事務所21,506 shared patent families
- SUZUYE & SUZUYE弁理士法人鈴榮特許綜合事務所21,920 shared patent families
Compare Sonderhoff & Einsel Patent Law Office side by side with
Explore the workspace profile
Open the app’s partner network, filing-year filters, and filing activity for Sonderhoff & Einsel Patent Law Office. App counts follow the filing years and corridors you choose, so they can differ from this public profile.
Filing activity
Recorded patent families across the filing years you choose.
Full partner list
Every observed counterpart for the filing period you choose.
Named clients
Applicant relationships behind the exchange counts.