Oil Oxidation Stability Patents: Top Companies & Trends 2026
- Concentrated at the top. The top 5 assignees hold 53.1% of all 145 records in scope, and the top 10 hold 75.9% — this field is not fragmented.
- Lubricant classes dominate the claim space. 80.7% of records sit in C10M (lubricants) and 46.9% in C10N (lubricant properties), while edible-oil-specific class A23D covers only 5.5%.
- Japan is the primary filing venue. 54 records route through Japan's receiving office versus 30 in the US and 28 at the EPO, ahead of the 10 filed via WIPO/PCT.
Filing growth compares 2021 (3 records) with 2024 (2) — 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 145 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families addressing oil oxidation stability and frying oil degradation — filings that combine claims on antioxidant blends, polar compound formation, induction time, polymerization, oil turnover or quality monitoring with oxidation stability or frying degradation as the technical problem. The scope spans 2015 through the 2026-07-31 cut-off, covering 145 published records and 145 patent families in the assignee ranking.
The technology composition skews heavily toward industrial lubricants rather than edible oil chemistry: C10M and C10N together dominate the class mix, while A23D (edible oils and fats) and G01N (material analysis and testing) each cover a much smaller slice of records. That split matters for anyone scoping a filing strategy — the bulk of the prior art protects base-oil and lubricant formulations, and the frying-oil-specific quality-monitoring angle is comparatively thin.
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Filing activity and technology mix
Publication counts below reflect the 145 records in scope as of the 2026-07-31 cut-off. Because publication lags filing by roughly 18 months, the most recent one to two years understate true filing activity.
Filing trend, 2017–2026
Filings peaked in 2020 at 6 records. Over the last fully comparable span, 2021 (3 records) to 2024 (2 records), volume fell 33% — a real pullback, though 2025 and 2026 figures are still filling in and should not be read as a continuation of that decline.
IPC subclass composition
C10M (lubricants) appears in 80.7% of records and C10N (lubricant properties) in 46.9%, confirming that most activity sits in industrial lubricant formulation rather than edible-oil processing. C10G (hydrocarbon refining, 12.4%), C10L (fuels, 8.3%) and C21D (metal heat treatment, 7.6%) point to shared base-oil chemistry across adjacent industrial uses. A23D (edible oils, 5.5%), G01N (testing, 5.5%) and H01B (insulators, 5.5%) are each present in only a small minority of records, since a record can carry multiple classes these shares sum to more than 100%.
Shares are the percentage of the 145 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Oil Oxidation Stability and Frying with Eureka
This page is one run against one query. Ask Eureka your own question about oil oxidation stability and frying and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative filing
US20080022757A1 — Oxidation stability measurement for oil condition management
A sensor apparatus is disclosed that includes a testing chamber or testing chamber arrays configured to receive a sample of oil to be tested. A first embedded heater is coupled to the testing chamber or testing chamber arrays and configured to supply heat to the sample. An oxygen flux chamber is coupled to the testing chamber or testing chamber arrays and configured to provide a substantially stable oxygen flux to the testing chamber. A control module is coupled to the testing chamber, the first embedded heater, and the oxygen flux chamber, and is configured to monitor sample temperature and direct heat and oxygen supply to run the oxidation test.Filed by Honeywell International, published 2008-01-31 — a hardware-and-control-loop approach to in-situ oxidation measurement rather than a chemical formulation claim.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US8193129B2 | Refrigerator oil, compressor oil composition, hydraulic fluid composition, metalworking fluid composition, he… | 774 |
| 2 | US6025305A | Process for producing a lubricant base oil having improved oxidative stability | 102 |
| 3 | US20100093568A1 | Refrigerator oil, compressor oil composition, hydraulic fluid composition, metalworking fluid composition, he… | 68 |
| 4 | JP1984089397A | Lubricant composition | 54 |
| 5 | EP1688476A1 | Lubricating base oil compositions and methods for improving fuel economy in an internal combustion engine usi… | 44 |
| 6 | US20060172898A1 | Lubricating base oil compositions and methods for improving fuel economy in an internal combustion engine usi… | 35 |
| 7 | JP1987039696A | Molybdenum-containing lubricating composition | 33 |
| 8 | JP1986285293A | Lubricant composition containing molybdenum | 26 |
| 9 | US20100062954A1 | Transmission fluid composition | 25 |
| 10 | JP1986019697A | Traction oil composition | 25 |
Citation counts favour older filings simply because they have had more time to accumulate citations inside the searched corpus; treat them as a signal of influence rather than of current technical importance.
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Browse MCP servers →What the numbers mean for filing strategy
Three patterns stand out once you separate record counts from family counts and look at where classes and citations concentrate.
A small group controls half the field
The leader alone accounts for 27 records, and the top 5 combined hold 53.1% of all 145 records in scope. That level of concentration means a new entrant's freedom-to-operate analysis should start with the ranked leaders' claim sets, not with a broad novelty search.
Lubricant formulation claims crowd the space
With C10N (lubricant properties) also present in 46.9% of records, base-oil and additive-package claims are heavily occupied. High density here signals occupied claim territory, not that the chemistry is settled — overlapping formulation claims are common in this class pairing.
Recent filing volume has pulled back
Filings fell from 3 in 2021 to 2 in 2024, a decline that follows the 2020 peak of 6. Because 2025–2026 publications are still arriving, this should be read as a genuine slowdown through the last complete year rather than evidence of a continuing trend.
Japan is the dominant filing venue
Japan's receiving office accounts for 54 records against 30 in the US and 28 at the EPO. A strategy built only around US or EPO prior art will miss the majority filing venue for this technology.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to oil oxidation stability and frying, with the prior art for and against each one.
Who holds the claim space, and where momentum sits
The assignee ranking covers 40 companies — the full set the data endpoint returns, not a top-50 or top-100 cut. Activity concentrates sharply at the top, and recent-year momentum has cooled across the leaders that report figures for the latest year.
A single assignee leads by a wide margin
The top-ranked assignee holds 27 records, well ahead of the field. Base-oil and lubricant-composition claims from this leader anchor much of the prior art that a new filer in industrial lubricants will need to search first.
Co-assignment is limited but present
Only 4 co-assignee pairs appear across the dataset, the strongest linking two related entities at 5 shared records. This is a field of largely independent filers rather than joint-venture-driven filing.
Leading assignees show no latest-year activity
Every leading assignee tracked for recent-year momentum, including the top-ranked filer, reports 0 records in the latest year, with one showing a -100% year-on-year change. Given the 18-month publication lag, this reflects incomplete recent-year data rather than an abandonment of the space.
| Assignee | Recent year | YoY |
|---|---|---|
| NIPPON OIL CORP | 0 | — |
| ExxonMobil Technology & Engineering Company | 0 | -100% |
| Nippon Oil Corporation | 0 | — |
| Chevron Oronite Co LLC | 0 | — |
| Idemitsu Kosan Co., Ltd. | 0 | — |
| Nippon Steel Chem & Material Co., Ltd. | 0 | — |
| BASF SE | 0 | — |
| ORONITE JAPAN | 0 | — |
Where to take this analysis
The dataset points to a few concrete next steps depending on whether you are scoping freedom-to-operate, planning R&D, or watching competitors.
Run a freedom-to-operate check against the leaders
With the top 5 assignees holding 53.1% of records, any new filing in lubricant oxidation stability should be checked against their claim sets before drafting.
Explore assignee claims in EurekaScope the edible-oil and sensing white space
A23D and G01N each cover only 5.5% of records, well below the lubricant classes — a narrower, less contested area for frying-oil-specific quality monitoring claims.
Map white space in EurekaTrack the recent filing pullback
Filings fell 33% from 2021 to 2024; watching whether 2025–2026 publications reverse or confirm that trend will matter for timing a new filing.
Set up trend monitoring in EurekaCommon questions on this landscape
The assignee ranking for this dataset covers 40 companies, with the leader holding 27 of the 145 records in scope. The top 5 combined hold 53.1% of all records and the top 10 hold 75.9%, so the field is concentrated among a small group of long-standing filers rather than spread evenly. Most of these leaders are established petroleum and lubricant companies rather than edible-oil or food-processing specialists, which reflects the dataset's skew toward C10M lubricant classes. Anyone assessing competitive position should treat the top 10 as the practical benchmark set.
Filing activity peaked in 2020 at 6 records and declined from 3 in 2021 to 2 in 2024, a 33% drop over that span. Because publication typically lags actual filing by around 18 months, records from 2025 and 2026 are still incomplete and should not yet be read as confirming or reversing that decline. Based on the last fully comparable years, the honest read is a real pullback through 2024, with the most recent trend still unresolved. Anyone tracking momentum should revisit this figure once 2025 filings finish publishing.
The dominant classes are C10M (lubricants), present in 80.7% of the 145 records, and C10N (lubricant properties), present in 46.9%. Smaller but notable classes include C10G (hydrocarbon refining, 12.4%), C10L (fuels, 8.3%) and C21D (metal heat treatment, 7.6%), reflecting shared base-oil chemistry across industrial applications. Edible-oil-specific class A23D and analytical class G01N each appear in only 5.5% of records. Because a single record can carry several IPC classes, these percentages sum to more than 100% and should not be added together.
The lubricant-formulation classes C10M and C10N are heavily occupied, so a new filer targeting industrial base oils will face dense prior art from the ranked leaders. Edible-oil-specific claims under A23D and analytical or sensor-based approaches under G01N cover a much smaller share of records, making frying-oil-specific antioxidant blends, real-time induction-time sensing and in-line quality monitoring for commercial fryers comparatively under-claimed. These branches sit outside the dominant lubricant cluster and warrant a closer novelty search before assuming they are crowded.
The most-cited record in this dataset is US8193129B2, covering refrigerator oil and multiple related lubricant compositions, followed by US6025305A on producing an oxidatively stable lubricant base oil. High citation counts in a searched corpus favour older filings simply because they have had more years to accumulate citations, so these figures signal historical influence on the field's formulation approaches rather than current commercial relevance. A newer, less-cited filing can still be more technically pertinent to today's freedom-to-operate question. Citation rank should be read alongside filing date, not as a standalone importance score.
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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.