Elastohydrodynamic Lubrication Patents: Leaders & White Space 2026
A data-backed view of elastohydrodynamic lubrication patents: filing trends, the concentration of filers, technology composition across IPC classes, and where the white space sits for R&D and IP teams.
Filing growth = 2021 (7 records) → 2024 (20); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 298 records in scope (CR5), not the ranked leaders only.
What the elastohydrodynamic lubrication patent record shows
Elastohydrodynamic lubrication (EHL) sits at the boundary between fluid film mechanics and elastic contact deformation — the physics governing gear teeth, rolling bearings, cams and rotating machinery under high pressure. The patent record captured here spans 298 records filed or published between 2015 and the 2026 data cut-off, drawn from a search that couples EHL terminology in titles and abstracts with claims-level lubricant and bearing classifications. Publication lags filing by roughly 18 months, so the most recent one to two years understate real activity.
The filing curve tracks closely with computational tribology: growth accelerates once G06F-classed digital-processing claims start appearing alongside traditional C10M lubricant chemistry and F16C bearing hardware, suggesting model-based film-thickness and surface-design methods are now a meaningful share of new filings rather than a niche.
Filing trend and technology composition
The two views below separate two questions: is filing activity growing, and where in the technology stack are applicants actually placing claims.
Filing trend: a step-change from 2021
Annual filings moved from 3 in 2017 to a peak of 32 in 2023. The 2021–2024 window shows the clearest signal: 7 filings in 2021 rising to 20 in 2024, a +186% increase over three years. 2025 and 2026 figures are still filling in as publications catch up to filing dates, so they should not be read as a slowdown.
Publication lags filing by roughly 18 months, so 2025 onwards are still filling in. Growth rates on this page therefore end at 2024; running them to the last bar would understate the field.
Technology composition across IPC subclasses
C10M lubricant chemistry remains the largest single class at 34.9% of the 298 records in scope, but G06F digital-processing classifications appear in 27.2% of records — a strong indicator that simulation and computational film-modelling claims now sit alongside chemical formulation as a primary route to protection. F16C bearing hardware (20.5%) and C10N lubricant-property claims (17.8%) round out the core, while B23K welding/brazing, F01L valve gear, C23C coatings and F16H gearing each cover a narrower single-digit-to-low-teens slice, pointing to specific downstream applications rather than broad coverage.
Shares are the percentage of the 298 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Tribology & Lubrication: Elastohydrodynamic Lubrication Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about tribology & lubrication: elastohydrodynamic lubrication patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
WO2026170615A1 — non-Gaussian rough surface design for elliptical-contact spin EHL under mixed lubrication
Filed by Xi'an Jiaotong University, this application builds Reynolds-equation models for elliptical-contact spin EHL across both Gaussian and non-Gaussian rough surfaces, computing fluid dynamic pressure, oil film thickness and asperity contact pressure to design rough contact surfaces aimed at extending component life in aero-engine and machine-tool applications.Filed 2026-08-20 — among the most recent publications in scope.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US3952566A | Bearing and lubricant film test method and apparatus | 60 |
| 2 | US4528852A | Method and instrument for determining the condition of an operating bearing | 59 |
| 3 | US20040002429A1 | Oil-in-oil emulsion lubricants for enhanced lubrication | 44 |
| 4 | US20100266423A1 | System and Method for Pump with Deformable Bearing Surface | 39 |
| 5 | CN108984933A | 弹流润滑条件下计算滚动轴承载荷和压力的边界元法 | 38 |
| 6 | US20140087982A1 | Microencapsulation of lubricant additives | 37 |
| 7 | CN204142192U | 旋滑式光干涉弹流润滑薄膜测量仪 | 34 |
| 8 | EP0107178A2 | Method and instrument for determining the condition of an operating bearing | 34 |
| 9 | US20100024592A1 | Friction piece in a lubricated medium, working at contact pressures higher than 200 mpa | 31 |
| 10 | US5636708A | Method and device for broad temperature range vapor lubrication | 27 |
Citation counts reflect influence within the searched corpus and skew toward older filings; they are not a measure 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 the ranking, the trend and the technology mix are read together.
The field is concentrated, not fragmented
Five assignees account for exactly half of all 298 records in scope, and the ranked leaders' top 10 hold 70.5%. That leaves a long tail across the remaining ranked entrants, each holding a small handful of filings.
Momentum is real and recent
Filings rose from 7 in 2021 to 20 in 2024 — the clearest complete-year growth window in the data. 2023's peak of 32 records suggests the field has not yet plateaued; treat 2025–2026 figures as still filling in.
Computation is now a primary claim route
More than a quarter of records combine EHL subject matter with digital data-processing classifications, alongside the 34.9% carrying core C10M lubricant chemistry. Modelling and simulation claims sit next to formulation claims, not behind them.
Filing activity is geographically lopsided
China's receiving office accounts for 123 filings against 36 in the United States and 33 at the EPO. Any freedom-to-operate check that skips Chinese-language filings is working from an incomplete picture of this field.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to tribology & lubrication: elastohydrodynamic lubrication patent landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| HEF | Jean Monnet University Saint-Etienne | 33 |
| HEF | Centre National de la Recherche Scientifique (CNRS) | 33 |
| Jean Monnet University Saint-Etienne | Centre National de la Recherche Scientifique (CNRS) | 33 |
| HEF | Ecole Centrale de Lyon | 31 |
| Jean Monnet University Saint-Etienne | Ecole Centrale de Lyon | 31 |
| Centre National de la Recherche Scientifique (CNRS) | Ecole Centrale de Lyon | 31 |
| HEF | Jean Monnet University Saint-Etienne | 2 |
| HEF | HEF | 2 |
The strongest co-assignee pairs in the data are academic-industrial links, each appearing on 33 shared records — evidence of sustained joint research programmes rather than one-off collaborations.
Where to take this analysis
The dataset points to three follow-up questions worth running before committing engineering or legal resource.
Map the design-around space around the leading assignees
With half of all records held by five assignees, a claim-chart comparison against those portfolios is the fastest way to find where new formulation or surface-design claims can still be filed cleanly.
Explore assignee portfolios in EurekaTrack the computational-EHL claim trend separately
G06F-classed filings are growing alongside traditional lubricant chemistry; treating them as one undifferentiated technology risks missing which claim type is actually driving recent growth.
Build a custom trend view in EurekaWatch the China filing pipeline directly
With 123 of 298 records filed through China's receiving office, English-language monitoring alone will miss the majority of new activity in this field.
Set up multilingual monitoring in EurekaFrequently asked questions
The dataset behind this page contains 298 published records filed or made public between 2015 and the 2026 cut-off, matched against a search combining EHL terminology in titles and abstracts with claims-level lubricant and bearing classifications. Because publication typically lags filing by around 18 months, the true number of filed-but-not-yet-published applications for the most recent one to two years is higher than shown. Patent families, rather than raw document counts, are the more reliable unit for comparing activity across jurisdictions since they neutralise multi-jurisdiction and continuation filing.
The assignee ranking behind this page covers 100 companies and research institutes, with the single leader holding 32 records and the field concentrated sharply at the top: the top five hold 50.3% of all 298 records and the top ten hold 70.5%. That leaves a long tail of single- or few-filing entrants across the remaining ranked list. This concentration pattern, rather than any single name, is the useful signal for competitive-intelligence purposes — it tells you dense prior art sits at the top of the ranking and differentiation opportunities sit below it.
Filing activity grew markedly over the period with complete-year data: from 7 filings in 2021 to 20 in 2024, a +186% increase, and a peak year so far of 32 filings in 2023. The apparent dip in 2025 and 2026 numbers is an artefact of publication lag rather than a genuine slowdown, since recent filings are still working through the roughly 18-month gap between filing and publication. Anyone benchmarking momentum should treat 2024 as the most recent reliable complete year.
Core lubricant chemistry under IPC class C10M is the largest single category, covering 34.9% of the 298 records in scope, followed by digital data-processing methods under G06F at 27.2% — reflecting the rise of computational film-thickness and surface-design modelling. Bearing and coupling hardware (F16C) and lubricant-property claims (C10N) follow at 20.5% and 17.8% respectively, with narrower application areas like welding (B23K), valve gear (F01L), coatings (C23C) and gearing (F16H) each covering smaller slices. Because a single record can carry multiple IPC classes, these shares add up to more than 100% and should not be summed into a total.
The technology composition data shows computational and modelling claims (G06F) growing alongside chemistry claims (C10M) rather than replacing them, which suggests combined chemistry-plus-modelling claim strategies are less crowded than either alone. Narrower application classes — coatings (C23C at 7.0%), gearing (F16H at 6.0%) and valve gear (F01L at 8.1%) — carry comparatively low filing density relative to the core categories, making them worth a closer look for underclaimed specific use-cases. A claim-chart review against the top-ranked assignees' actual portfolios, rather than the raw technology shares alone, is the next step to confirm any specific white-space hypothesis.
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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.