The ranked assignee list is led by a single company holding 45 families, but the field is not dominated by a small group: the top 5 assignees combined account for only 12.2% of the 1,351 records in scope, and the top 10 for 18.9%. Several of the most active filers are Chinese battery-recycling and metallurgical research groups, alongside established metals refiners. The remainder of the ranking is a long tail of companies with far fewer filings each, which points to a technology still being worked out at the process level rather than locked up by a few platform patents.

Filings grew from 107 records in 2021 to 118 in 2024, a real but modest 10% increase over that three-year window. The dataset shows a peak of 146 records in 2025, but that figure and the 24 recorded so far in 2026 should be read with caution: patent publication typically lags filing by around 18 months, so the most recent one to two years always look lower than the eventual final count. There is no evidence in this dataset of a genuine slowdown once that lag is accounted for.

Metal extraction and refining, IPC subclass C22B, appears in 59.6% of the 1,351 records in scope, making it by far the largest single category. Iron production via blast furnace (C21B) is a distant second at 8.9%, followed by solid waste disposal, magnetic and electrostatic separation, and several inorganic-compound classes each in the 5-8% range. Because a record can carry more than one IPC code, these percentages overlap rather than summing to 100%, reflecting how often extraction claims are paired with separation or compound-recovery steps.

China's national patent office received 888 of the applications in this dataset, far ahead of any other jurisdiction. The United States follows with 66, then WIPO/PCT filings at 56, Australia at 49, the European Patent Office at 42, and Canada at 36. Anyone running a freedom-to-operate check should treat China as the primary jurisdiction to clear, but should not skip the smaller markets, since they carry a meaningfully different mix of applicants.

CA2863423A1 describes a laterite-nickel ore processing method filed by Beijing Shenwu Environment and Energy Technology Corp, which classifies ore by particle size before routing the coarser fraction into a rotary hearth furnace and pressing the finer fraction into carbon-containing pellets. It is included here as a representative record because it illustrates a common pattern in this dataset: process-engineering claims around ore preparation and furnace feed, aimed at improving recovery rate and cutting processing cost, rather than a novel chemistry. Anyone designing a similar pre-treatment step should review its specific claim boundaries before assuming an alternative particle-size cutoff or furnace type is clear.