Filing volume in this corpus peaked at 168 in 2022 and has fallen sharply since, down to single digits in the latest partial year. Part of that drop is a reporting artifact: publication typically lags filing by around 18 months, so the most recent one to two years will always look artificially thin. But the decline starting well before the cut-off, combined with negative year-on-year momentum at nearly every major assignee tracked, suggests a genuine slowdown in new filing activity rather than just an undercount.

The assignee ranking in this dataset is derived from 1,300 patent families, with large DRAM and processor manufacturers holding meaningful positions alongside academic research foundations that co-file with them. Rather than a single dominant leader, the field shows concentration among a small group of established semiconductor and computing firms, each now filing at a reduced pace compared to prior years. Checking the full ranking table alongside the momentum figures gives a more accurate read than headline volume alone, since some large holders have gone quiet in the most recent tracked year.

The United States is by far the primary filing destination in this corpus, with 792 of 1,300 records receiving at USPTO — more than Europe, WIPO, India, China and Taiwan combined. That concentration means litigation and licensing risk for memory controller and bandwidth-optimization claims is heavily weighted toward US jurisdiction. Freedom-to-operate reviews that focus only on European or Chinese filings will miss the bulk of the contested claim territory.

The core of this corpus sits in electric digital data processing (G06F) and static/digital memories (G11C), which together account for the large majority of records. Secondary overlap appears in image data processing, semiconductor devices, digital transmission, AI-model computing, display control and coding/code conversion — each a modest but consistent share. This pattern indicates that bandwidth and refresh-management claims increasingly reach into adjacent domains like AI workload scheduling and display pipelines rather than staying confined to classic memory controller design.

US20260141940A1, assigned to Samsung Electronics and published 2026-05-21, describes a memory system with a memory device holding a candidate register set of parameter sets tied to temperature ranges, and a memory controller that selects and updates a refresh management parameter set based on measured temperature. In practice this claims temperature-adaptive refresh parameter selection as a mechanism, not refresh management generally. Anyone designing refresh logic that varies parameters by temperature range should review this filing's specific claim language before assuming a workaround is clear, since the mechanism it protects is fairly narrow but sits in an active filing area.