The assignee ranking in this dataset is led by a small set of firms with repeat, multi-year filing history, including Luminar-related entities, Waymo, Rockley Photonics and Baraja, though several of these show no filings in the most recent year. The rest of the 252 tracked families are spread across a long tail of single or few-filing applicants. Because the ranking is based on patent families rather than raw documents, it reflects distinct inventions rather than continuation filings inflating any one assignee's count.

Filing volume rose from 11 families in 2017 to a peak of 47 in 2020, then eased toward 38 by 2022 — a flat-to-declining pattern rather than continued growth. The final one to two years in any dataset like this are understated because publication typically lags filing by about 18 months, so the true 2024–2026 picture will only become clear once later filings post. On the evidence available now, this looks like a space where core approaches were staked out early rather than one still expanding.

G01S (radar, sonar and positioning) appears in 251 of the 252 records, meaning almost every coating claim in this corpus is drafted as part of a system-level LiDAR application. G02B (optical elements and systems) is the next most common at 55 records, followed by smaller counts in H01S (lasers), G01C (navigation and gyroscopes), G05D (control) and the lighting-related classes F21K, F21V and G01J. A comprehensive search should not stop at optics classes alone — it needs to follow the ranging-system classification too.

US20230034553A1, filed by HL KLEMOVE CORP., covers a light receiving module for LiDAR in which a reflective mirror sits between the receiving lens and detector, with a reflective layer positioned on the surface facing incoming light to selectively reflect part of that light toward the detector. Its scope centres on the mirror's placement and structural relationship to the lens and detector, not on any specific coating chemistry. Designs that route received light differently — for example without an intermediate selective-reflection mirror stage — sit outside its core claim structure, but any receive-path design using a comparable mirror-and-detector arrangement should be checked against it directly.

The IPC composition data points to several under-claimed branches: multi-layer beam-splitter durability coatings, coating claims tied to G01J radiation measurement (only 7 records), anti-reflection layers specifically for gallium-nitride laser sources, and protective coatings for rotating or scanning optical assemblies. These areas show thin representation relative to the dense core of anti-reflection and bandpass-filter claims, which suggests room for narrowly drafted claims rather than an assumption that the entire coating space is occupied.