The assignee ranking covers 27 companies across 101 published records, and it is concentrated rather than fragmented: the top five assignees combined hold 70.3% of all records, with the leading company alone holding 21. This is a specialist field dominated by established fire-detection manufacturers rather than a broad set of industrial entrants. Anyone assessing freedom to operate should start with this small group before looking further down the ranking.

Filing activity rose from 2 records in 2017 to a peak of 13 records in 2020, then eased in the years since. The apparent decline in the most recent one to two years should be read cautiously, because publication typically lags actual filing by around 18 months, so recent activity is understated in any dataset cut off close to the present. There are too few complete recent years to state a reliable growth rate.

The largest share of records, 74.3%, falls under G08B signalling and alarm systems, followed by G01N material analysis and testing at 51.5% — together reflecting the core detect-and-decide function of these systems. Smaller but notable shares cover G05D control of non-electric variables (18.8%), G01P velocity and acceleration sensing (16.8%), and A62C fire-fighting (12.9%). Because a record can carry more than one IPC code, these shares overlap rather than sum to a whole field.