OHTSUKA PATENT OFFICE
弁理士法人大塚国際特許事務所
Public patent records for OHTSUKA PATENT OFFICE, 1978–2025: 10,497 patent families shared with other firms for 303 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
- 10,497
- 1978–2025. One family can be counted more than once.
- Activity 2016–2020
- 1,588
- Distinct families per year, summed over the last five complete years. 2021 onward is still being published.
- Clients (applicants)
- 303
- Applicants named on these families, all recorded years. Not a full client list.
- Firms shown below
- 5
Activity trend (2017–2026)
- Scope
- OHTSUKA 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 | 155 |
| 2018 | 122 |
| 2019 | 476 |
| 2020 | 635 |
| 2021 · preliminary | 501 |
| 2022 · preliminary | 478 |
| 2023 · preliminary | 185 |
| 2024 · preliminary | 151 |
| 2025 · preliminary | 6 |
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 |
|---|---|---|
| Telephonic communicationIPC/CPC H04M | 3.4% | 6.0× |
| Wireless communication networksIPC/CPC H04W | 26.0% | 4.7× |
| Typewriters; selective printing mechanisms, i.e. mechanisms printing otherwise than from a forme; correction of typographical errorsIPC/CPC B41J | 3.3% | 4.5× |
| Transmission of digital information, e.g. telegraphic communicationIPC/CPC H04L | 18.3% | 3.4× |
| TransmissionIPC/CPC H04B | 6.1% | 3.2× |
Yearly counts for 2018–2022, added up: 1,973 of 2,372 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.
- Taiyo International Patent10,888 shared patent families
- TMI Associates Osaka OfficeＴＭＩ総合法律事務所 大阪オフィス9,879 shared patent families
- SONODA & KOBAYASHI園田・小林特許業務法人9,818 shared patent families
- HIRAKI & ASSOCIATES弁理士法人平木国際特許事務所9,636 shared patent families
- ONDA TECHNO International Patent Attorneys弁理士法人オンダ国際特許事務所11,374 shared patent families
Compare OHTSUKA PATENT OFFICE side by side with
Explore the workspace profile
Open the app’s partner network, filing-year filters, and filing activity for OHTSUKA 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.