Y.S.CHANG & ASSOCIATES
Public patent records for Y.S.CHANG & ASSOCIATES, 1978–2025: 3,730 patent families shared with other firms for 313 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
- 3,730
- 1978–2025. One family can be counted more than once.
- Activity 2016–2020
- 718
- Distinct families per year, summed over the last five complete years. 2021 onward is still being published.
- Clients (applicants)
- 313
- Applicants named on these families, all recorded years. Not a full client list.
- Firms shown below
- 5
Activity trend (2017–2026)
- Scope
- Y.S.CHANG & ASSOCIATES · South Korea
- 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 | 84 |
| 2018 | 141 |
| 2019 | 206 |
| 2020 | 209 |
| 2021 · preliminary | 167 |
| 2022 · preliminary | 176 |
| 2023 · preliminary | 113 |
| 2024 · preliminary | 22 |
| 2025 · preliminary | 1 |
Technology fields it focuses on
Fields where this firm's share of patent families is well above the average for South Korea firms, 2018–2022.
| Field | Share of its families | vs South Korea average |
|---|---|---|
| Non-portable lighting devices; systems thereof; vehicle lighting devices specially adapted for vehicle exteriorsIPC/CPC F21S | 5.2% | 14.9× |
| Arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in generalIPC/CPC B60Q | 2.7% | 12.6× |
| Non-metallic elements; compounds thereof; metalloids or compounds thereof not covered by subclass C01CIPC/CPC C01B | 6.2% | 3.4× |
| Coating compositions, e.g. paints, varnishes or lacquers; filling pastes; chemical paint or ink removers; inks; correcting fluids; woodstains; pastes or solids for colouring or printing; use of materials thereforIPC/CPC C09D | 8.1% | 3.2× |
| Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bondsIPC/CPC C08G | 9.3% | 2.8× |
Yearly counts for 2018–2022, added up: 1,317 of 1,854 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 South Korea firms
Yearly counts since 1990, added up. One family can be counted more than once.
- AJU KIM CHANG LEE특허법인 아주3,685 shared patent families
- PanKorea Patent & Law Firm3,534 shared patent families
- Lee Geon-Ju Patent Law Office이건주특허법률사무소3,504 shared patent families
- Myungshin & Partners3,990 shared patent families
- Koo Young-chang Patent Law Office구영창3,457 shared patent families
Compare Y.S.CHANG & ASSOCIATES side by side with
Explore the workspace profile
Open the app’s partner network, filing-year filters, and filing activity for Y.S.CHANG & ASSOCIATES. 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.