One assignee leads the ranked field with 21 records, well ahead of every other company in the 11-company ranking, where fifth place holds only 2 records and tenth place holds 1. This gap suggests the leader has driven much of the underlying interoperability standard itself, since the size of its portfolio is not matched by any other single filer. Anyone assessing competitive risk in this space should treat that leader's claims as the first reference point, then check the much smaller filings from the remaining ranked assignees for narrower, more specific positions.

Based on IPC classification across the 45 records in scope, 95.6% carry an H02J power supply and grid systems classification, making this fundamentally a power-electronics claim space. Digital information transmission (H04L) and general transmission (H04B) classes appear on 26.7% and 22.2% of records respectively, covering the negotiation, authentication and interoperability-testing layer that sits on top of the power hardware. A small number of records touch aircraft equipment or geophysics classes, but those are edge applications rather than a distinct sub-field.

Filing volume rose from zero records in 2017 to a peak of 17 in 2022, then declined in subsequent years through the 2026 partial-year count of 2. Because publication typically lags filing by around 18 months, the most recent one to two years understate true filing activity, so the apparent decline should be read cautiously rather than taken as a confirmed slowdown. The clearest fact the data supports is that 2022 was the high point observed so far.

The composition data shows claims concentrated heavily in H02J power-architecture classes, with the communication-protocol layer covering under a third of records each for H04L and H04B. That gap points to under-claimed sub-areas around cross-standard authentication handshakes, interoperability test protocols, and magnet-array alignment tolerancing, where fewer records compete for claim space relative to the core power-transfer hardware. A first filing drafted specifically around one of these narrower branches, rather than broad power-profile claims, has a better chance of clearing prior art.

US20230006477A1, filed by Infineon Technologies AG and published 2023-01-05, covers a wearable device with an antenna structure, a receiver chip, and a trigger device containing electrically conductive material that triggers foreign object detection in a wireless charger compliant with a wireless charging standard. The mechanism works by the trigger device taking up load from radio waves emitted by the charger. Anyone designing a wearable accessory intended to signal foreign-object-detection systems on a standards-compliant charger should review this claim scope closely, since it sits directly in that trigger-mechanism space.