This dataset contains 224 published records filed between 2015 and mid-2026 that match soil vapor extraction and air sparging remediation terms combined with technical qualifiers like well spacing, vapor flow rate and vadose zone. The true global total is larger, since this is a scoped search rather than an exhaustive count of every remediation patent ever filed. Filing activity within this window has stayed low and roughly flat, peaking at 7 records in 2023, which is consistent with a mature rather than fast-growing technology area.

The assignee ranking covers 79 companies, and it is heavily concentrated: the top 5 combined hold 97 of the 224 records in scope (43.3%), with the single leading assignee accounting for 45 of those. Beyond the top 10, which together hold 58.5% of all records, filing activity spreads thinly across a long tail of assignees with only a handful of families each. This pattern is typical of a field with a long operating history rather than one still attracting new entrants at scale.

In patent terms, soil vapor extraction (SVE) claims typically centre on withdrawing contaminated vapor from the vadose zone, often specifying well spacing, vapor flow rate or off-gas carbon treatment as key parameters. Air sparging claims instead focus on injecting air below the water table to volatilise contaminants, which then migrate upward for capture, frequently by an SVE system. Many records in this dataset, including the representative filing analysed here, combine both techniques with additional heat or oxygen injection into a single integrated system rather than claiming either technique alone.