Dishwashing Appliance Patents: Leaders, Trends & White Space 2026
- Filing has cooled since 2019. annual filings peaked at 77 in 2019 and have declined toward single digits by 2026, with the most recent year still understated by publication lag.
- Six major assignees show flat or negative momentum. several of the historically active filers recorded zero filings in the latest tracked year, a sign the core mechanical claims are largely staked out.
- Filing concentrates almost entirely in one IPC subclass. 1,227 of 1,229 records sit in A47L, with drying, control and filtration subclasses each carrying a fraction of that volume — a visible size gap between core and adjacent claims.
Filing growth compares 2021 (45 records) with 2024 (32) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 1,229 records in scope (CR5), not by the ranked leaders only.
What the dishwasher and water-using appliance patent record shows
Dishwashing and water-using appliance patents cluster around a narrow set of mechanical and control problems: spray arm hydraulics, detergent dispensing, drying performance and noise reduction. The dataset behind this page spans 1,229 patent families published between 2015 and mid-2026, drawn from filings that name dishwasher or water-using appliance subject matter and sit inside the core cleaning-appliance IPC classes. Filing offices skew toward the United States and Europe, with meaningful volume also routed through the PCT system and Japan, Australia and Austria.
Reading the filing trend against the technology composition tells a fuller story than either alone. Volume is heavily concentrated in a single IPC subclass, and the year-by-year trend shows a peak that has already passed. That combination usually means later entrants are refining or defending existing mechanisms rather than opening new ground, and it puts a premium on finding the adjacent branches that have not yet been claimed as densely.
Filing trend and technology composition
Two views of the same 1,229-family dataset: how filing volume has moved year over year, and how that volume splits across the IPC subclasses that define the technology.
A peak in 2019, then a decline
Annual filings ran from 46 in 2017 to a peak of 77 in 2019, settling near the midpoint of 52 by 2022 before trending down toward 3 in 2026. Because publication typically lags filing by around 18 months, the most recent one or two years will always look thinner than they eventually turn out to be, but the shape of the decline from the 2019 peak predates that lag effect and reflects a real cooling in new filing activity.
Volume concentrates in one subclass
A47L (cleaning and washing appliances) accounts for 1,227 of the 1,229 records — effectively the entire dataset — while D06F (laundering, drying and ironing), B08B (general cleaning), G05B (control systems), F26B (drying), B01D (separation and filtration) and B01J (chemical/physical processes) each carry a much smaller share. That gap between the core class and its neighbours is where under-claimed sub-areas tend to sit.
Shares are the percentage of the 1,229 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Dishwashing and Water-Using Appliances with Eureka
This page is one run against one query. Ask Eureka your own question about dishwashing and water-using appliances and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this space
Protective arrangement for a control device associated with a dishwashing appliance, and associated apparatus and method
A protective arrangement for protecting a control device associated with a dishwashing appliance is provided. A door assembly is pivotably engaged with a tub portion of the dishwashing appliance and cooperates therewith to cover a forward access opening defined by the tub portion. The control device is mounted to the door assembly and is adapted to selectively direct operation of at least one operational component of the dishwashing appliance. The protective arrangement is configured to wrap about the control device so as to be at least partially disposed between the control device and door assembly.Filed by Electrolux Home Products, this record illustrates how control-device protection and detergent-dispenser placement were claimed together on the door assembly — a pattern worth checking before designing new door-mounted control layouts.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4509543A | Industrial dishwasher monitor/controller with speech capability | 239 |
| 2 | US4756321A | Industrial dishwasher chemical dispenser | 192 |
| 3 | US5500050A | Ratio feed detergent controller and method with automatic feed rate learning capability | 158 |
| 4 | US20040173249A1 | Dishwasher comprising spraying arms and a circulating pump | 145 |
| 5 | US3888269A | Control system for dishwasher | 137 |
| 6 | US5176297A | Dishwasher detergent dispenser | 136 |
| 7 | US5904163A | Dishwasher for washing dishes by rotating a dish washing basket and dish washing basket therefor | 101 |
| 8 | US5839454A | Automatic detergent dispenser | 99 |
| 9 | WO2002058528A1 | Detergent dispenser system | 90 |
| 10 | EP1319360A1 | Domestic dishwasher with a front loading door having a recessed panel and a detergent measurer/dispenser supp… | 85 |
Citation counts are drawn from the searched corpus and favour older, foundational filings; treat them as a measure of influence on later filings rather than of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers say about where this field stands
Three signals from the dataset matter most for anyone deciding where to file next: the shape of the filing curve, the concentration of claim space, and the citation weight sitting on the oldest records.
The 2019 peak has not been matched since
Annual filings rose from 46 in 2017 to a peak of 77 in 2019, then declined through the 2022 midpoint of 52 down toward 3 in 2026. Even allowing for publication lag understating the final year or two, the multi-year decline from peak indicates the field has moved past its most active filing period.
Almost the entire dataset sits in one subclass
A47L (cleaning and washing appliances) dominates the technology composition, while drying, control systems, filtration and general cleaning each hold a small fraction of that volume. New filers looking for open claim space are more likely to find it at the edges — in the smaller adjacent subclasses — than at the core.
Foundational control and dispensing patents still anchor the field
The most-cited records in this corpus date back to industrial dishwasher monitoring and chemical dispensing controls, with the top record citing counts running from 239 down through the 130s. That weight sits on older filings, a reminder that citation volume tracks influence built up over years rather than what is being actively asserted today.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to dishwashing and water-using appliances, with the prior art for and against each one.
Who is still filing, and who has stepped back
Momentum data across the historically active assignees shows a field where most large filers have slowed sharply or stopped filing new families in the most recent tracked year, even though their combined historical volume remains substantial.
Several long-standing filers recorded zero filings in the latest year
More than one of the historically active assignees in this dataset shows a 100% year-over-year drop, with zero families filed in the latest tracked year. Combined with the overall filing decline, this points to a field where core mechanical claims around spray arms, dispensing and drying are largely staked out by incumbents.
Co-assignee filing is limited and concentrated
Only 10 co-assignee pairs appear in the dataset, and the strongest of them link a single Turkish appliance manufacturer with named inventors, alongside one German appliance group with its US subsidiary. Co-filing is not a major route into this space; most families carry a single corporate assignee.
Filing activity is anchored in the US and Europe
The United States and the European Patent Office together account for the largest share of receiving-office activity, ahead of the PCT route and national filings in Japan, Australia and Austria. Freedom-to-operate work in this field should prioritise US and EP prosecution histories first.
| Assignee | Recent year | YoY |
|---|---|---|
| Samsung Electronics Co., Ltd. | 1 | -75% |
| Arcelik A.S. | 0 | -100% |
| BSH Home Appliances (Bosch Siemens Hausgerate GmbH) | 0 | — |
| LG Electronics Inc. | 0 | -100% |
| Whirlpool Corporation | 0 | — |
| Panasonic Corporation | 0 | — |
| Electrolux Home Products, Inc. | 0 | — |
| General Electric Company | 0 | — |
Where to take this next
The filing trend and technology composition point to a field past its peak filing rate but with specific adjacent branches still open. The next steps depend on whether the goal is freedom-to-operate, white space filing or competitor tracking.
Check freedom-to-operate against the top-cited prior art
The highest-citation records in this corpus cover industrial dishwasher control, chemical dispensing and detergent feed-rate learning. Any new control or dispensing mechanism should be checked against these before filing.
Run a freedom-to-operate check in EurekaMap the smaller IPC subclasses in detail
Drying, filtration and control-system subclasses each carry a fraction of the core A47L volume. A closer look at claim language in those subclasses can surface specific under-claimed mechanisms.
Explore IPC subclass detail in EurekaTrack assignees with flat or negative momentum
Several historically active assignees show sharply reduced or zero recent filings. Monitoring whether that reflects a strategic pause or a shift to trade secrecy matters for competitive tracking.
Set up assignee monitoring in EurekaCommon questions about dishwasher and water-using appliance patents
This dataset tracks 1,229 patent families across major appliance manufacturers with historical filing activity, several of which are shown separately in the assignee ranking on this page. Ranking by raw count can be misleading, though, because it mixes companies still filing actively with ones that have gone quiet in recent years. Recent-year momentum data matters more than cumulative totals if the goal is understanding who is currently investing in new claims rather than who filed heavily in the past.
No, not based on the filing trend in this dataset. Annual filings peaked at 77 in 2019 and have declined through a 2022 midpoint of 52 down to 3 by 2026, though the final year or two is always understated because publication typically lags filing by about 18 months. Even accounting for that lag, the multi-year decline from the 2019 peak indicates filing activity has cooled rather than accelerated.
The clearest signal is the gap between the core A47L subclass, which holds 1,227 of 1,229 records, and much smaller adjacent subclasses like drying (F26B), filtration (B01D) and control systems (G05B). Areas such as spray arm hydraulic flow control, detergent auto-dosing sensors, drying-cycle heat recovery and noise-dampening pump mounts carry less filing density than the core mechanical claims. A first claim in one of these branches should specifically target the sensor, control or flow-path element rather than the general appliance housing, since housing-level claims are far more heavily occupied.
This Electrolux Home Products filing covers a protective arrangement for a control device mounted on a dishwasher door assembly, positioned between the control device and the door and also disposed relative to a detergent dispensing device. It matters for anyone designing door-mounted control panels or integrated dispenser-control layouts, since it establishes prior art on wrapping a protective member around a control device in that specific location. Designing around it generally means relocating the control device off the door assembly or changing the physical relationship between the protective member and the dispenser.
The United States leads with 356 records in this dataset, followed by the European Patent Office at 307 and the PCT (WIPO) route at 100. Japan, Australia and Austria each contribute smaller but meaningful volumes. This split suggests that freedom-to-operate and competitive clearance work should prioritise US and European prosecution histories first, since that is where the bulk of enforceable rights in this field are concentrated.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.