Transmission Lubrication Patents: Top Companies & Trends 2026
- Filing has cooled since its 2021 peak. 34 families that year against 5 so far in the most recent (partial) year — activity is flat to declining, not accelerating.
- Claim space is chemistry-heavy, not mechanical. 744 of 751 records sit in C10M (lubricants) and 572 in C10N (lubricant properties), versus just 55 in F16H (gearing hardware).
- Filing is split across five offices with no single gatekeeper. Europe, the US, China, Japan and WIPO each hold over 100 records, so freedom-to-operate has to be checked jurisdiction by jurisdiction.
Filing growth compares 2021 (34 records) with 2024 (25) — 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 751 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Transmission fluid and gear oil patents cluster around friction modification, oxidation and shear stability, wet clutch compatibility, and low-viscosity formulation — the properties that determine whether a fluid survives inside a modern automatic or dual-clutch transmission. The dataset pulls 751 patent families published between 2015 and mid-2026 under IPC codes covering lubricant composition (C10M), lubricant property classification (C10N) and gearing hardware (F16H), filtered to documents whose title or claims name a transmission fluid, automatic transmission fluid or gear oil alongside one of the five target performance characteristics.
Because publication typically lags filing by around 18 months, the last one to two years in any trend chart will look thinner than actual filing activity once the backlog clears. Family counts, not raw document counts, are used throughout so that multi-jurisdiction refiling of the same invention is not counted repeatedly.
Filing trend and technology composition
751 patent families make up this landscape, filed across six major receiving offices and concentrated overwhelmingly in lubricant chemistry rather than transmission hardware.
A 2021 peak followed by a pullback
Filings rose from 17 in 2017 to a peak of 34 in 2021, then eased back toward 19 by 2022 and continued down through the most recent partial year. That shape reads as a maturing, formulation-driven field rather than one in an early growth phase — most of the obvious viscosity-index and friction-modifier combinations have already been claimed by the leading fluid formulators.
Chemistry dominates over hardware
744 of 751 records fall under C10M (lubricant compositions) and 572 under C10N (the companion property-classification code), confirming this is a formulation landscape. F16H (gearing and transmissions) appears in only 55 records, and adjacent polymer and base-oil codes — C10G, C07C, C08F, C08G, C10L — each sit in the low twenties, marking smaller but real satellite claim areas around base stocks and viscosity-index improver chemistry.
Shares are the percentage of the 751 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Transmission Lubrication and Fluids with Eureka
This page is one run against one query. Ask Eureka your own question about transmission lubrication and fluids and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this space
EP0994174A1 — Naphthenic base oil automatic transmission fluid (Chevron)
The filing covers a lubricating composition built on a hydrocracker-derived, highly naphthenic, low-viscosity-index mineral oil, combined with 2-14 wt.% of at least one polymethacrylate polymer and 2-14 wt.% of a performance additive package. The base oil itself is defined by a two-stage process: routing part of a fuels hydrocracker bottoms stream to dewaxing while recycling the remainder back through the hydrocracker for further processing.Claim scope centres on the base-oil production route as much as the finished fluid composition.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO1999041332A1 | Low viscosity LUBE basestock | 465 |
| 2 | US4792410A | Lubricant composition suitable for manual transmission fluids | 345 |
| 3 | US6660695B2 | Power transmission fluids of improved anti-shudder properties | 116 |
| 4 | US5538654A | Environmental friendly food grade lubricants from edible triglycerides containing FDA approved additives | 111 |
| 5 | US5070131A | Gear oil viscosity index improvers | 103 |
| 6 | US6059955A | Low viscosity lube basestock | 98 |
| 7 | US6337309B1 | Zinc-free continuously variable transmission fluid | 77 |
| 8 | EP0291006A2 | Lubricating oil composition having improved temperature characteristics | 65 |
| 9 | US6482778B2 | Zinc and phosphorus containing transmission fluids having enhanced performance capabilities | 63 |
| 10 | CN102504913A | 一种极压抗磨剂及其制备方法和应用 | 58 |
Citation counts are drawn from a searched corpus and skew toward older filings that have had more years to accumulate citations — treat them as a measure of influence on subsequent filings, not as a signal of current commercial relevance.
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 family counts, IPC composition and office spread are read together.
The growth phase has passed
Filings peaked at 34 in 2021 and have declined every year since, with the midpoint year of 2022 already down to 19. New entrants should treat this as a landscape where the core friction-modifier and viscosity-index combinations are largely occupied, not one where blank space is opening up.
Formulation, not hardware, is where the claims sit
With F16H hardware claims at only 55 records against 744 in lubricant composition, competitive risk and freedom-to-operate work should focus on additive packages, base-oil chemistry and viscosity control rather than clutch or gear mechanical design.
No single office dominates
Europe, the United States and China each hold well over 100 filings, with Japan and WIPO close behind. A clearance search limited to one office will miss a meaningful share of the active claim base.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to transmission lubrication and fluids, with the prior art for and against each one.
Who is filing, and where the activity is moving
Filing is led by the major base-oil and additive suppliers, with co-filing patterns showing tight internal collaboration inside a few corporate groups rather than broad cross-company alliances.
ExxonMobil shows the only rising signal
Among the tracked assignees, ExxonMobil (technology and engineering) is the sole one adding filings in the latest year — four families, up 300% year on year — while several long-standing filers, including Lubrizol and Evonik, show a 100% drop against the prior year.
Collaboration stays inside corporate families
The strongest co-assignee pair links Sinopec with its own Research Institute of Petroleum Processing (11 shared families) — internal R&D structuring, not cross-company alliance. The ExxonMobil/Esso pairing (7) and Chevron/Miller pairing (4) follow the same intra-group pattern.
Established filers have gone quiet
Chevron, Idemitsu Kosan, Infineum International and Lubrizol all show zero filings in the latest tracked year. That does not mean these companies have exited the space — publication lag means recent filings may not yet be visible — but it does mark a pause worth watching alongside ExxonMobil's uptick.
| Assignee | Recent year | YoY |
|---|---|---|
| ExxonMobil Research and Engineering Company | 4 | +300% |
| Chevron U.S.A. Inc. | 0 | — |
| Idemitsu Kosan Co., Ltd. | 0 | — |
| Lubrizol Corporation | 0 | -100% |
| Infineum International Limited | 0 | — |
| Evonik Operations GmbH | 0 | -100% |
| Afton Chemical Corporation | 0 | — |
| Ethyl Corporation | 0 | — |
Where to take this analysis
This landscape flags the concentration points and the quiet spots; the next step is testing a specific formulation or claim idea against them.
Map a candidate formulation against the leaders
Take a specific additive package or base-oil route and check it against the filing patterns of the companies showing active momentum, particularly where a leader has just resumed filing.
Explore in Eureka →Probe the under-claimed branches
The thin sub-areas identified here — bio-based esters, e-axle-specific low-viscosity fluids, hybrid duty-cycle clutch durability — are worth a deeper novelty search before committing R&D spend.
Run a novelty search →Check freedom-to-operate office by office
With filings spread across five major offices at roughly comparable volumes, a single-jurisdiction clearance search is not sufficient for a global product launch.
Start a clearance search →Common questions about transmission fluid patents
Filing in this space is led by the major base-oil and lubricant-additive suppliers rather than automakers directly, since the transmission fluid itself is typically formulated by chemical companies and supplied into the auto industry. Co-filing data shows that internal corporate structures, such as Sinopec filing jointly with its own Research Institute of Petroleum Processing, account for the strongest paired relationships in the dataset. No single assignee dominates outright; the landscape has a leader plus a long tail of single- or few-filing entrants across 751 families.
Filing peaked in 2021 at 34 families and has declined in the years since, dropping to 19 by 2022 and continuing lower through the most recent partial year. That pattern points to a maturing field where the major friction-modifier, viscosity-index and additive-package combinations are largely staked out, rather than one in an early growth phase. Note that the very latest year is understated in any such chart because publication lags filing by roughly 18 months.
The dataset is filtered to five core performance characteristics — friction characteristics, oxidation stability, shear stability, wet clutch compatibility and low viscosity — and the IPC composition confirms the field is chemistry-led. 744 of 751 records fall under C10M (lubricant compositions) and 572 under the companion C10N property-classification code, against only 55 in F16H gearing hardware. Practically, this means most competitive risk sits in additive packages and base-oil chemistry, not in mechanical transmission design.
The receiving-office data shows no single dominant jurisdiction: Europe leads with 149 filings, the United States follows with 136, then China at 121, Japan at 102 and WIPO's PCT route at 56. A filing strategy aimed at only one or two of these offices will leave meaningful gaps in both offensive coverage and freedom-to-operate protection, given how evenly the volume is spread.
EP0994174A1, filed by Chevron, claims an automatic transmission fluid built on a hydrocracker-derived, highly naphthenic, low-viscosity-index mineral oil combined with 2-14 wt.% polymethacrylate polymer and a 2-14 wt.% performance additive package, alongside a specific two-stage dewaxing and recycle process for producing that base oil. It sits among the most-cited records in this landscape because it ties a base-oil production route directly to finished-fluid performance claims, giving it broad relevance to later filings on both base-stock chemistry and additive formulation. Anyone formulating a naphthenic-base ATF should review its claim boundaries closely.
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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.