Yamakawa International Patent Office Tokyo
Public patent records for Yamakawa International Patent Office Tokyo, 1978–2024: 3,963 patent families shared with other firms for 216 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
- 3,963
- 1978–2024. One family can be counted more than once.
- Activity 2016–2020
- 596
- Distinct families per year, summed over the last five complete years. 2021 onward is still being published.
- Clients (applicants)
- 216
- Applicants named on these families, all recorded years. Not a full client list.
- Firms shown below
- 5
Activity trend (2017–2026)
- Scope
- Yamakawa International Patent Office Tokyo · Japan
- Filing years
- 2017–2024
- 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 | 117 |
| 2018 | 51 |
| 2019 | 157 |
| 2020 | 116 |
| 2021 · preliminary | 134 |
| 2022 · preliminary | 129 |
| 2023 · preliminary | 84 |
| 2024 · preliminary | 33 |
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 |
|---|---|---|
| Wireless communication networksIPC/CPC H04W | 9.4% | 1.7× |
| Transmission of digital information, e.g. telegraphic communicationIPC/CPC H04L | 8.8% | 1.7× |
Yearly counts for 2018–2022, added up: 701 of 1,375 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.
- Kuon Patent Office3,972 shared patent families
- Axis International Patent Firmアクシス国際特許業務法人3,980 shared patent families
- Wakaba International Patent Officeわかば国際特許事務所4,003 shared patent families
- Washida International Patent Office弁理士法人鷲田国際特許事務所4,023 shared patent families
- INFORT International Patent Officeインフォート弁理士法人3,880 shared patent families
Compare Yamakawa International Patent Office Tokyo side by side with
Explore the workspace profile
Open the app’s partner network, filing-year filters, and filing activity for Yamakawa International Patent Office Tokyo. 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.