The dataset's assignee ranking shows a clear leader holding 134 of the 396 records in scope, far ahead of the fifth-ranked filer at 16 and tenth-ranked at 8. The top five assignees combined hold 221 records, 55.8% of the total, and the top ten hold 266, 67.2%. This is a concentrated field structurally, with a small group of established agricultural machinery makers controlling the bulk of filed claims and a long tail of single- or few-filing entrants behind them.

Nearly nine in ten records (89.1% of 396) classify under F26B, the core drying apparatus class, confirming this is primarily a hardware and process-control field rather than a materials or chemistry one. Smaller shares touch combustion control, food preservation, crop threshing and processing, moisture and material testing, and general control systems, each in the single digits. Because records can carry multiple IPC classes, these shares add up to more than 100% of the record total and should be read individually rather than summed.

Filings peaked at 10 in 2021 and had fallen to 5 by 2024, a -50% change across that three-year span, based on the years that can be treated as reasonably complete. Counts for 2025 and 2026 look lower still, but publication typically lags filing by around 18 months, so those recent years are undercounted rather than necessarily reflecting a real drop in filing activity. A fair reading is that activity cooled from its 2021 peak, without over-interpreting the very latest partial years.

Japan is by far the largest receiving office in this dataset with 257 filings, more than six times the next-largest office, the United States, at 42. Canada, India, the EPO and Australia form a smaller secondary tier with counts in the low teens. Any competitive or freedom-to-operate assessment in this field should treat Japan as the primary jurisdiction to clear, with the United States as the significant secondary market.

US4750273A, filed by Shivvers Inc. and issued in 1988, claims a computer-controlled grain dryer system that samples grain moisture via a capacitive sensor cell, computes dielectric-constant-based moisture readings, and uses that feedback to control grain flow speed in continuous crossflow and concurrent-flow dryers. It is one of the most-cited records in this set, with 77 citations, making it a foundational reference for automated moisture-feedback drying control. Anyone building a new moisture-feedback control loop for continuous-flow drying should review its claim scope closely, even though the patent itself is decades old and any original term has long since expired.

The clearest gaps sit outside the dense F26B drying-apparatus core: control and sensing classes such as G01N, G05B and G05D each cover only 3.5% or less of the 396 records, and B02B milling-adjacent claims sit at 2.3%. That suggests claims tying specific sensing methods (stress-cracking detection, moisture uniformity modelling) or specific-energy optimisation control loops to drying hardware face less prior art density than claims on the drying apparatus itself. This is a directional read from classification shares, not a guarantee of novelty, and should be checked against a full prior-art search before filing.