One assignee leads the ranked field with 12,245 records, more than twelve times the fifth-place count of 1,007. The top 5 assignees together hold 42.9% of all 45,398 records in scope, and the top 10 hold 49.4%. This means a small number of portfolios control roughly half the documented claim space, so competitive analysis or licensing due diligence should start with those names before moving to the long tail of smaller filers.

Filing activity rose from 1,376 records in 2017 to a peak of 2,028 in 2022, then eased to 1,580 by 2024 — a 10% decline over that three-year, complete-year window. Because publication typically lags filing by about 18 months, the 2025 and 2026 figures in any trend chart are still incomplete and should not be read as evidence of a continued fall. The honest read is a post-peak plateau rather than a clear slowdown.

G06F, electric digital data processing, appears on 24.2% of the 45,398 records in scope, more than double the next largest class, G06T image data processing at 8.0%. Application-specific classes such as games (A63F, 3.2%) and image/video recognition (G06V, 2.6%) are comparatively thin, which suggests most claim density sits in general processing and control logic rather than in vertical-specific haptic implementations. Since a record can carry several IPC classes, these shares add up to more than 100% of the record total.

US6411276B1, assigned to Immersion Corporation and granted in 2002, claims a hybrid haptic feedback architecture where a host computer and a haptic device's microcontroller share the computation of force effects. Specifically, the microcontroller can compute closed-loop force values for one effect type while simultaneously receiving host-computed values for a different effect type. Anyone building a haptic system that splits force computation between a host and an embedded controller should review this filing's claim scope closely, since it predates much of the field and has drawn substantial forward citation.

Relative to the dense core processing claims under G06F, sub-areas such as low-power actuator drive circuits for mobile haptics, cross-device haptic bitstream encoding, and pose-tracking-linked tactile rendering show comparatively lower filing density in this dataset. High density elsewhere means claim space is occupied, not that these adjacent branches are technically inferior — they are simply less crowded starting points for new filings. A targeted prior-art search on the specific sub-area is still necessary before drafting, since low density in an IPC-level view can hide dense claim clusters underneath.