This landscape identifies 180 published patent families filed between 2015 and mid-2026 that match claims combining MEMS loudspeaker terminology with acoustic and structural features such as sound pressure level, membrane excursion, air chamber design, and piezoelectric or electrostatic drive. The count reflects a defined search scope rather than every MEMS acoustic patent in existence, so a broader or narrower query would return a different total. Because publication lags filing by roughly 18 months, the most recent one to two years are undercounted relative to their eventual final total.

Filing is concentrated: the top five assignees account for 111 of the 180 records in scope, or 61.7%, and the top ten account for 132, or 73.3%. The single leading assignee alone holds 83 records, well ahead of the fifth-ranked filer at 5 and the tenth at 3. The ranking includes 42 assignees in total, so beyond the leaders there is a long tail of companies and universities with only one or a few filings each.

Filing peaked at 23 records in 2023, and the 2021-to-2024 window shows a modest 8% dip, from 12 filings to 11. That is a flattening rather than a collapse, and the apparent drop in 2025 and 2026 in the raw trend chart is largely an artefact of publication lag, since patents typically publish around 18 months after filing. A fairer read is that filing activity has plateaued at a moderate, sustained level rather than declining.

Almost all records, 95.0% of the 180 in scope, fall under H04R, the general loudspeaker and audio transducer classification, since that reflects the acoustic function common to all these devices. Fewer records touch the more specific MEMS structural classes: B81B, covering microstructural devices, appears in 11.7%, and B81C, MEMS manufacturing, in only 4.4%. Semiconductor-adjacent classes like H10N and H01L appear in smaller shares still, suggesting that structural and fabrication-process claims are comparatively less saturated than general acoustic performance claims.

The clearest signal comes from the gap between the near-universal H04R acoustic classification and the much smaller MEMS-specific structural classes like B81B and B81C, which suggests structural and packaging claims are less densely filed than acoustic-performance claims. Specific under-claimed areas worth checking include air chamber venting geometry, electrostatic drive membrane control, wafer-level packaging approaches for MEMS speakers, and excursion sensing tailored to in-ear form factors. Any claim in these areas still needs a dedicated novelty search, since class-level composition only indicates relative density, not the absence of blocking art.