This landscape identifies 573 patent families published between 2015 and mid-2026 that match claim language around automotive Ethernet, in-vehicle network architecture and zonal network design. The count uses patent families rather than raw document counts, which avoids inflating the total through continuations or parallel filings in multiple jurisdictions. Coverage spans IPC classes for digital transmission, vehicle accessories and related traffic-data handling, so the true underlying activity is somewhat broader than any single search string can capture.

The trend has declined from a peak of 95 families in 2020 to a midpoint of 26 by 2022, with further tapering since. That pattern suggests the foundational architecture claims — network topology, gateway management, basic diagnostics — were largely staked out in the late 2010s. Because publication lags filing by roughly 18 months, the most recent one to two years in any such trend will always look thinner than they eventually turn out to be, so this is a directional read rather than a final one.

The dataset shows a tight filing cluster among three related entities — Sumitomo Electric, Auto Network Technology Research Institute and Sumitomo Wiring Systems — which co-assign patents with each other at the highest pairing strength recorded, 50. Other named assignees, including Panasonic's US IP entity, Toyota and PlaxidityX, show activity in prior years but zero filings in the most recent tracked year. This points to a field where a small coordinated group carries much of the recent filing volume.

The IPC composition shows heavy concentration in H04L (517 families) and B60R (250 families), against only 8 families in G06N, the AI-computing class. That gap implies adaptive or learning-based approaches to bandwidth allocation, fault prediction and gateway scheduling on in-vehicle networks are comparatively under-claimed. Time-sensitive networking scheduling for mixed-criticality traffic and EMC mitigation specific to unshielded twisted-pair Ethernet also show thinner density relative to core gateway and transmission claims.

US6484082B1, covering in-vehicle network management using virtual networks, holds the highest citation count in this corpus at 210. That figure measures how often later filings in the searched set reference it, which tends to favour older, foundational patents simply because they have had more time to accumulate citations. It is a useful signal of influence on how the field's vocabulary and architecture developed, but it should not be read as a measure of the patent's current commercial weight or remaining term value.