One assignee holds 1,251 of the 1,852 records in this dataset, far ahead of fifth place at 44 and tenth place at 25. The top five assignees together account for 78.8% of all records and the top ten for 88.2%, so filing activity is concentrated in a small group of oilfield-services companies and operators rather than spread across many independent players. Any competitive or freedom-to-operate analysis in this field should start by mapping that leader’s full claim scope before looking at anyone else.

Filings peaked at 241 in 2020, then fell to 72 in 2021 and 61 in 2024, a -15% move over that three-year span. That reads as a pullback from an unusually active year rather than a collapsing field. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so it is too early to call the current trajectory falling or slowing based on the most recent years alone.

An interval control valve is typically an actuated device, opened or closed (often hydraulically) to manage flow in a specific zone of a completion. An autonomous inflow control device instead uses passive, fluid-property-driven mechanisms — such as density-sensitive shiftable elements, as described in the representative filing US12359542B2 — to restrict undesirable fluid inflow without external actuation. Both terms appear together in this dataset’s search scope because claims frequently combine zonal control logic with one or the other mechanism.