Industrial Gearbox Patents: Leaders, Trends & White Space 2026
- Filing activity has cooled since its 2018 peak of 6. the midpoint year 2022 recorded just 2 filings, and the trend through 2026 shows no rebound — this is a mature, not a growing, claim space.
- United States and China dominate the receiving offices, with 26 and 22 filings respectively against single digits everywhere else, meaning most enforceable rights sit in two jurisdictions.
- The most-cited prior art is decades old, led by a 1978-era disengage mechanism patent cited 105 times — a sign the foundational mechanics were settled early and citation weight favours legacy filings, not current ones.
A settled mechanical field with a long tail of narrow filers
Industrial gearbox technology — planetary gear trains, high-torque reducers, backlash reduction and gear tooth profile work — sits inside a well-established mechanical discipline. The dataset behind this page covers 75 patent families published between 2015 and mid-2026, concentrated under IPC class F16H (gearing and transmissions) with secondary overlap into clutches, dampers, aerospace drive systems and vehicle propulsion. Peak filing activity was 2018, and the years since have not returned to that level.
Because publication typically lags filing by around 18 months, the most recent year in any trend understates real activity — but even allowing for that lag, the flat-to-declining pattern from the 2022 midpoint onward points to a field where core mechanical claims are largely staked out rather than one still being actively contested.
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Filing trend and technology composition
Two views of the same 75-family dataset: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
Filings declined from a 2018 peak
Filings rose to 6 in 2018, then fell back; by the 2022 midpoint annual volume had dropped to 2, and the trend has not recovered through the most recent (partial) year.
F16H dominates, with cross-over into adjacent mechanical domains
All 75 records touch F16H gearing and transmissions. Secondary concentrations appear in F16D clutches/brakes and F16F springs/dampers (7 records each), with smaller pockets in aerospace (B64C), vehicle propulsion (B60K), combustion engines (F02B) and positive-displacement pumps (F04B) — evidence that gearbox claims are increasingly drafted alongside a specific end application rather than as standalone mechanisms.
Shares are the percentage of the 75 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaThe prior art that still shapes freedom to operate
US20180051775A1 — Motorized gear reducer
A motorized gear reducer built from at least three stages of a sunless planetary gear train, each stage pairing a stationary ring gear with a rotatable ring gear used as torque output, driven through carriers on a shared axial support shaft, with a hollow motor surrounding the first stage.Filed by Racing Electric Instrument Co., Ltd.; published 2018-02-22.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4043226A | Disengage mechanism for gear drive | 105 |
| 2 | US4719818A | Turbocharger planetary drive | 79 |
| 3 | US5662545A | Planetary gear drive assembly | 67 |
| 4 | US6080077A | Planetary gear drive train | 38 |
| 5 | US5797185A | Method of making an isolated ring gear for planetary gear drive systems | 38 |
| 6 | US5716300A | Isolated ring gear for planetary gear drive systems | 38 |
| 7 | US3889549A | Reversible-output rotary gear device | 28 |
| 8 | CN204525304U | 电动扭矩扳手 | 22 |
| 9 | US2401875A | Reduction gear drive | 20 |
| 10 | US3861243A | Rotary connection for roll bodies with transmission | 19 |
Citation counts inside a searched corpus favour older filings; treat this table as a map of foundational influence, not of current filing strength.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once the raw counts are read against filing dates, jurisdictions and citation weight.
Activity has cooled, not accelerated
Annual filings peaked at 6 in 2018 and had fallen to 2 by 2022, with no recovery visible through the most recent year. New entrants should treat this as a mature mechanical space where the core claim territory was largely defined in the previous decade.
Two offices carry almost all the volume
United States (26) and China (22) receive the bulk of filings, with Europe, Japan, South Korea and the PCT route each in single digits. Freedom-to-operate work outside these two jurisdictions faces a much thinner prior-art record.
Foundational mechanics were settled early
The most-cited record in the set is a 1970s-era disengage mechanism for gear drives, with several other high-citation records also decades old. Heavy citation weight sitting on old filings signals that basic planetary and disengagement mechanisms are settled prior art rather than open ground.
Collaboration is rare and narrow
Only four co-assignee pairs appear across the dataset, each linking two related corporate entities rather than cross-industry partners. Most filings in this space are made by a single assignee working alone.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to industrial gearbox technology landscape, with the prior art for and against each one.
A wide, low-volume assignee base with little recent momentum
No single assignee dominates this dataset; instead a broad set of corporate and individual filers each hold a small number of families, and recent-year activity has gone quiet across the named assignees tracked for momentum.
A long tail rather than a clear leader
The 75 families in this dataset spread across a wide assignee base that includes aerospace, automotive, industrial and individual filers, with no assignee showing the kind of filing volume that would indicate a dominant platform strategy.
Named assignees show no latest-year filings
Every assignee tracked for recent-year momentum — including Sikorsky Aircraft, Ecolab USA, BorgWarner and Citizen entities — recorded zero filings in the latest year, consistent with the broader flat-to-declining trend.
Co-filing stays inside corporate families
The strongest co-assignee links, such as the two Citizen entities and Ebara Corporation with Niigata Converter, connect related companies rather than independent partners, suggesting little cross-company joint development in this field.
| Assignee | Recent year | YoY |
|---|---|---|
| Sikorsky Aircraft Corporation | 0 | — |
| Ecolab USA Inc. | 0 | — |
| BorgWarner Inc. | 0 | — |
| Tianjin Surgeon Medical Instruments Co., Ltd. | 0 | — |
| Citizen Watch Co., Ltd. | 0 | — |
| Citizen Micro Co., Ltd. | 0 | — |
| British Motor Corporation | 0 | — |
| Rolls-Royce Limited | 0 | — |
Turning this landscape into a filing or freedom-to-operate decision
The dataset points to where claim space is dense and where it thins out — the next step is testing a specific claim or design against it.
Screen a draft claim against the cited prior art
Run a specific gear train or reducer claim against the most-cited records in this set, since several remain influential despite their age.
Explore claim search in EurekaMap white space before drafting
Use the under-claimed sub-areas identified here as a starting point for a narrower novelty search before committing drafting resources.
Run a white space analysis in EurekaTrack assignee momentum over time
Recent-year filings have gone quiet across every tracked assignee; monitoring shifts here can flag a competitor re-entering the space early.
Set up assignee monitoring in EurekaCommon questions about industrial gearbox patents
This dataset does not show a single dominant assignee; instead, 75 patent families are spread across a broad base of aerospace, automotive, industrial equipment and individual filers. Names such as Sikorsky Aircraft, BorgWarner, Ebara Corporation and several Citizen entities appear among the tracked assignees, but none shows sustained high-volume filing. That pattern is typical of a mature mechanical field where the foundational mechanisms are already patented and new filings tend to be narrow, application-specific improvements rather than platform-defining claims.
The trend in this dataset is flat to declining. Filings peaked at 6 in 2018, fell to 2 by the 2022 midpoint, and show no recovery through the most recent tracked year. Because patent publication typically lags filing by around 18 months, the very latest year is always undercounted, but the multi-year direction before that lag effect applies is still downward rather than growing.
Based on IPC composition and filing density, thinner areas include backlash compensation in multi-stage planetary trains, hollow-motor integrated reducer housings, and gear tooth profile optimisation specifically for high-torque reducers. Cross-domain applications — gear reducers built into surgical instruments, pumps or turbocharger assemblies — also show lower filing density than the core F16H gearing class. Any of these would need a targeted novelty search before drafting, since low density in this dataset does not guarantee an empty field globally.
The United States and China receive the large majority of filings in this dataset, with 26 and 22 records respectively, while Europe, Japan, South Korea and the PCT route each account for single digits. A freedom-to-operate review focused only on the US and China would capture most of the documented prior art here, though it would still miss regional filings that never entered these two offices.
Citation counts inside any searched patent corpus naturally favour older documents, because they have had more years and more subsequent filings in which to accumulate citations. In this dataset the top-cited record is a 1970s-era disengage mechanism for gear drives with 105 citations, alongside several other high-citation records from the 1980s and 1990s. That weighting reflects influence on the field's foundational mechanics, not that these patents remain the most relevant to a current design decision.
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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.