TSUTSUI PATENT OFFICE
弁理士法人筒井国際特許事務所
Public patent records for TSUTSUI PATENT OFFICE, 1978–2025: 2,578 patent families shared with other firms for 193 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
- 2,578
- 1978–2025. One family can be counted more than once.
- Activity 2016–2020
- 470
- Distinct families per year, summed over the last five complete years. 2021 onward is still being published.
- Clients (applicants)
- 193
- Applicants named on these families, all recorded years. Not a full client list.
- Firms shown below
- 5
Activity trend (2017–2026)
- Scope
- TSUTSUI PATENT 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 | 46 |
| 2018 | 41 |
| 2019 | 142 |
| 2020 | 155 |
| 2021 · preliminary | 107 |
| 2022 · preliminary | 110 |
| 2023 · preliminary | 65 |
| 2024 · preliminary | 34 |
| 2025 · preliminary | 1 |
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 |
|---|---|---|
| Electric digital data processingIPC/CPC G06F | 13.9% | 2.0× |
| Optical elements, systems or apparatusIPC/CPC G02B | 7.5% | 1.8× |
| Image data processing or generation, in generalIPC/CPC G06T | 6.8% | 1.7× |
| Pictorial communication, e.g. televisionIPC/CPC H04N | 7.2% | 1.6× |
Yearly counts for 2018–2022, added up: 545 of 725 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.
- Eikou Patent Office特許業務法人栄光特許事務所2,600 shared patent families
- Takada & Takahashi International Patent Office弁理士法人高田・高橋国際特許事務所2,614 shared patent families
- Kawaguchi International Patent Office川口 義雄2,539 shared patent families
- Ohno Law Offices大野総合法律事務所2,529 shared patent families
- Ashida & Kimura2,504 shared patent families
Compare TSUTSUI PATENT OFFICE side by side with
Explore the workspace profile
Open the app’s partner network, filing-year filters, and filing activity for TSUTSUI PATENT 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.