One assignee leads the ranked field with 177 of the 976 records in scope, well ahead of the fifth-ranked assignee at 38 and the tenth at 19. The top five combined hold 34.5% of all records, and the top ten hold 48.4%. That leaves roughly half the field spread across a long tail of the remaining ranked assignees, most holding only a handful of filings each, so a freedom-to-operate review should weight time toward the leading group first.

Filing rose from 9 records in 2021 to 14 in 2024, a 56% increase over that three-year span, and 2024 is the most recent year that publication lag lets us treat as reasonably complete. Raw volume actually peaked earlier, in 2018 at 75 records, but the 2021-2024 window shows renewed upward movement rather than decline. Figures for 2025 and 2026 look lower only because publication typically lags filing by about 18 months, not because activity has genuinely dropped.

GB2031160A, filed in 1980, describes a vibration-test chamber with a vibrator table, support pillars, sealing bellows and a pressure-biasing air bag or spring — foundational environmental-test-chamber mechanics rather than anything specific to lidar or automotive sensors. It predates lidar as a commercial category by decades, so it functions more as prior art underlying later vibration-durability test methods than as a direct block on sensor-specific claims. Anyone drafting new vibration-test claims should still check its specific mechanical arrangement against their own chamber design.