In this dataset of 20 records, one assignee leads with 4 filings, and the top 5 assignees combined account for 60.0% of all records in scope. That said, the field flattens quickly after the leader — fifth place already holds only a single filing, so this is a landscape with one clear leader and a long tail of smaller filers rather than several evenly matched competitors. Anyone assessing risk should focus first on the leading filer’s specific claim language before assuming broader industry lock-up.

The trend does not show a clean upward line. Filing peaked at 7 records in 2020, with much thinner activity in the years around it, and because publication typically lags filing by roughly 18 months, the most recent years in the dataset understate actual activity. There are too few complete years after accounting for that lag to state a reliable growth rate, so treat any apparent recent decline with caution rather than as a signal the field is shrinking.

Testing and structural-balance claims under IPC class G01M are the largest single category, covering 35.0% of the 20 records in scope — ahead of body-fluid devices and material-analysis classes, which each sit at 15.0%. Actuator-specific claims under F15B make up only 10.0% of records, which suggests diagnostic and verification claims are currently more actively contested than the core actuator hardware itself. Because a single record can carry multiple IPC classes, these percentages add up to more than 100% and should not be read as parts of a whole.