The leading assignee in this dataset holds 26 of the 352 records in scope, with the field dropping off quickly after that — the fifth-ranked company holds 11 and the tenth holds 8. The top 5 assignees combined account for only 21.6% of all records, and the top 10 for 34.4%, so ownership is spread across a long tail of smaller filers rather than concentrated in one or two companies. Anyone doing freedom-to-operate work should expect to check a wide list of assignees rather than a handful of dominant players.

Filings rose from 14 in 2017 to a peak of 20 in 2021, then eased to 16 by 2024, a -20% change over that span. Counts for 2025 and 2026 look lower still, but that is expected: publication typically lags filing by around 18 months, so the most recent one to two years in any patent dataset are undercounted. Based on the complete years through 2024, the field looks like a post-peak plateau rather than a genuine decline.

Cleaning chemistry leads: detergent and cleaning-composition claims (IPC class C11D) appear in 23.6% of the 352 records, more than any single hardware class. Cleaning and washing appliances (A47L) follow at 18.8%, sterilising and disinfecting (A61L) at 15.1%, and general cleaning apparatus (B08B) at 14.2%. Because a single record can carry multiple IPC classes, these figures overlap rather than summing to 100%, but the ordering shows that formulation and chemistry claims currently occupy more of the field than mechanical rinsing hardware alone.

US20240109094A1, filed by Raven Industries, describes a sprayer cleaning assembly with a dedicated cleaning-agent reservoir and two distinct plumbing configurations: an application mode where the boom and nozzles connect only to the product reservoir, and a cleaning mode where the same lines switch over to the cleaning-agent reservoir and circulate cleaning agent through the boom tube. It is representative of a design pattern common in this landscape — reservoir isolation with a switchable flow path — rather than an unusually broad claim. A new design that avoids a dedicated switchable reservoir architecture, or that routes cleaning agent through a genuinely different physical path, would sit outside its core claim language, though a detailed claim chart against the granted claims is the only reliable way to confirm that.

The classification data shows heavier claim density in cleaning chemistry (C11D) and general appliance cleaning (A47L, B08B) than in more specific operational features like closed transfer interlocks, automated rinsate volume logging or cross-contamination sensor triggers. These narrower operational areas sit inside the search scope but do not show up as separately dense IPC clusters in this dataset, suggesting thinner claim coverage. A first claim tightly drafted around automated logging of rinsate volumes tied to a closed-transfer interlock is a plausible route into that gap, though it should be checked against the individual assignee filings before drafting.