res-patent-landscapelisted

# Patent Landscape ## Search design - **Do not rely on keywords — IPC/CPC classification is the axis**: classification codes solve the problem of the same technology filed under different terms. - Procedure: ① secure 3–5 representative patents → ② extract their IPC/CPC codes → ③ search classification codes in full, in parallel with technical terms → ④ expand via citations and cited-by. - Use the **filing date (priority date)** for time series — registration dates distort. ## Landscape analysis - **Assignee concentration CR5**: top-5 share > 50% = mature, high entry barriers; < 20% = fragmented. - **Lifecycle**: filing trends per classification code. Growth-stage signals = rising counts + appearance of new entrants. - **Citation clusters**: a persistently cited, strong citation axis = the technology core. Non-citing (independent) clusters = white-space candidates. - **Patent family analysis**: country-expansion patterns of the same filing = commercialization signal (families covering major markets are the valid assets). ## FTO screening (3 risk factors) **Validity** (annuities kept up, rights maintained) × **infringement likelihood** (representative claim vs. product configuration — literal + doctrinal reading) × **jurisdiction** (manufacturing and sales venues). Never assert infringement — hand off to a patent attorney for legal review. ## Output ``` # Patent Landscape — {technology} ({as-of date}) ## Entry-barrier verdict (CR5 · lifecycle stage) ## IPC map (code | meanin