The dataset’s leading assignee holds 19 of the 302 records in scope, with the fifth-ranked filer at 10 and the tenth at 6. That is a moderate concentration: the top 5 assignees combined account for 22.8% of all records and the top 10 for 35.1%, which leaves roughly two-thirds of filings spread across a long tail of smaller filers. No single company controls the field outright, so freedom-to-operate analysis has to look beyond the largest names.

It is growing, and quickly. Annual filings rose from 9 in 2021 to a peak of 38 in 2024, a +322% increase over that span. The apparent drop in 2025 and 2026 is a publication-lag artefact — patent applications typically take about 18 months to publish, so the most recent two years in any dataset always look lower than they will once filings catch up.

The bulk of claims sit in C12M, bioreactor and enzyme apparatus, which touches 78.8% of the 302 records — covering vessel geometry, ports, and mechanical structure. Microorganism and genetic-engineering claims under C12N appear in 56.3% of records, and fermentation-related C12P claims in 31.5%. Smaller but present categories include horticulture (A01G), water treatment (C02F) and electrolytic production (C25B), each under 17%, marking areas where vessel-design claims cross into adjacent applications less often.