The dataset ranks 19 companies across the 79 records in scope. Filing is concentrated rather than evenly spread: the top five assignees together hold 70.9% of all records, and the top ten hold 89.9%. That leaves a long tail of assignees with only one or two records each, which is typical for a technology area with a dominant early mover.

Filings rose from 4 in 2017 to a peak of 11 in 2021, then fell to 4 by 2024, a -64% change over that span. However, patent publication typically lags the actual filing date by around 18 months, so the 2025 and 2026 figures in any dataset are still incomplete. It is more accurate to say activity cooled after 2021 than to say it is currently declining, since the most recent years have not finished publishing.

Just under half of the 79 records, 46.8%, are classified under F24F, air conditioning and ventilation, ahead of G06Q business and data processing at 21.5% and B63B ships and marine vessels at 15.2%. This shows that a large share of the relevant claim activity runs through general air-handling and control-system art rather than marine-specific hull classifications, which matters when running a freedom-to-operate search — searching B63B alone would miss most of the field.