This dataset covers 3,756 published records filed or published between 2015 and the 2026 data cut-off, drawn from a search combining title mentions of electronics heat spreaders with claims language linking heat spreading to electronic devices. The true figure is somewhat higher because publication lags filing by roughly 18 months, so the most recent one to two years are still filling in. Patent families rather than raw document counts are the fairer way to compare filers, since families neutralise repeated continuation and multi-jurisdiction filing by the same applicant.

The ranking covers 100 companies, with the leader holding 416 records and the fifth-placed filer holding 78. The top 5 filers combined account for 894 records, 23.8% of the 3,756 in scope, and the top 10 combined reach 30.8%. That leaves the majority of filings spread across a long tail of smaller entrants rather than concentrated at the very top, which is worth checking against the ranked table directly rather than assuming a single dominant player.

Filings rose from 182 in 2017 to a peak of 224 in 2021, then fell to 103 by 2024, a 54% decline over that three-year span. Figures for 2025 and 2026 look lower still, but that is an artefact of publication lag rather than a real drop — records filed in those years are still being published. The honest read is that 2021 marked a high point and 2022-2024 cooled from it, with the most recent trend not yet fully visible.

H01L (semiconductor devices) and H05K (printed circuits and assemblies) are the two largest IPC subclasses, covering 45.8% and 39.5% of the 3,756 records respectively, with H10W close behind at 37.0%. Heat-exchanger-specific classes such as F28F and F28D sit much lower, at 6.5% and 4.4%. That pattern indicates most heat-spreader innovation is being claimed as part of a semiconductor package or circuit assembly rather than as standalone thermal-exchange hardware, which matters when deciding which class to search or file against.

US10515886B2, assigned to Broadpak Corporation and published in December 2019, claims an electronic package built around a first and second substrate joined by at least one standoff substrate that forms a defined clearance and carries through-substrate vias connecting the outer substrates. It sits among the representative records in this landscape as an example of interposer-style packaging integration rather than a dedicated heat-spreader material claim. Anyone designing around it should look closely at the standoff-substrate and via-connection language specifically, since that is the structural element the claim turns on, and compare it against the other most-cited records in the same corpus before finalising a design.