Within this 49-record dataset, filing is concentrated: the top 5 assignees together hold 61.2% of all records, and the top 10 hold 79.6%. The single leading assignee accounts for 13 records on its own, well ahead of the fifth-ranked assignee at 3. Beyond the top 10, the remaining 20 of the 30 ranked assignees each hold only a handful of filings, so the field has a clear leader group and a long tail rather than an even spread.

C12P, covering fermentation and enzymatic synthesis, appears on 75.5% of the 49 records and is the dominant class for this process chain. C12N (microorganisms and genetic engineering) follows at 42.9%, reflecting how much of the innovation here is enzyme-variant and organism-engineering work rather than pure mechanical processing. C13K, the class specifically for saccharides from natural sources, sits at 30.6% — lower than C12P, which tells you that enzyme and fermentation claims outnumber raw extraction-process claims in this space.

The trend in this dataset peaked in 2021 at 6 records and dropped to zero by the 2022 midpoint, with every one of the six top assignees tracked for recent-year momentum showing no filings in the latest year. That pattern reads as flat-to-declining rather than growing, though publication lag of roughly 18 months means the most recent one or two years will still fill in as pending applications publish. Anyone using this data for a go/no-go decision should treat the last two years as provisional rather than final.

This filing from Zhejiang Huakang Pharmaceutical describes a purification system for reducing 5-hydroxymethylfurfural content in high-fructose syrup, using a sequenced ion-exchange, heat-exchange and chromatographic-separation train to move an F42 stream to F55 grade. It is a system-and-method claim tied to a specific processing sequence, not a claim over isomerization or ion exchange generally, so it constrains a particular purification architecture rather than the whole refining step. Companies working on HMF control should review the exact sequencing and equipment claims rather than assume the whole downstream-refining space is blocked.

IPC classes with lower representation relative to the core C12P and C13K classes — such as A21D (baking applications) at 6.1% and A23K (animal feed) at 10.2% — suggest these application areas carry fewer direct process claims. Byproduct handling, including 5-HMF reduction and co-product gluten and fiber valorisation, also shows comparatively thin coverage against the density in core enzymatic and fermentation claims. These are starting points for a freedom-to-operate search, not confirmed clear space, since low IPC density does not rule out relevant claims filed under adjacent classifications.