Rolling Bearing Fatigue & Fracture Patent Landscape
The rolling bearing fatigue and fracture patent space is dominated by two Japanese incumbents — NSK and NTN — whose combined filings dwarf all other applicants. The field has reached maturity, with annual volume plateauing near its 2018 peak and the United States remaining the primary filing jurisdiction.
NSK and NTN control the field; the top tier is highly concentrated
NSK Ltd leads all applicants with 731 patent records, followed closely by NTN Corp at 686 patent records. These two alone account for the bulk of activity among the hundred largest filers, with the top five filers collectively representing 73% of the combined total of those hundred filers.
The tier gap between the top two and the rest is substantial: AB SKF, ranked third, holds 103 patent records — less than one-sixth of NSK’s total. JTEKT Corp (69 records) and Timken (55 records) form a secondary cluster that is competitive in niche sub-segments but structurally distant from the leaders.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | NSK Ltd | 731 | |
| 2 | NTN Corporation | 686 | |
| 3 | AB SKF | 103 | |
| 4 | JTEKT Corporation | 69 | |
| 5 | The Timken Company | 55 | |
| 6 | SCHAEFFLER TECHNOLOGIES AG & CO KG | 46 | |
| 7 | Koyo Seiko Co., Ltd. | 34 | |
| 8 | Roller Bearing Company of America, Inc. | 24 | |
| 9 | The Torrington Company | 23 | |
| 10 | SKF ENG & RES CENT | 21 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Denso Corporation | 21 | |
| 12 | General Electric Company | 20 | |
| 13 | MinebeaMitsumi Inc. | 20 | |
| 14 | Cooper Roller Bearings Co., Ltd. | 16 | |
| 15 | Nissan Motor Co., Ltd. | 15 | |
| 16 | NSK RHP European Technology Co. | 13 | |
| 17 | RTX Corporation | 12 | |
| 18 | Kyodo Yushi Co., Ltd. | 12 | |
| 19 | Nippon Steel Corporation | 11 | |
| 20 | Rexnord Corporation | 11 |
NSK’s and NTN’s positions imply deep, long-standing investment in bearing materials, heat treatment, and tribological engineering. New entrants face high prior-art density in the core F16C class and would need to differentiate through adjacent routes such as surface engineering or smart-sensing integration to establish protectable positions.
Filings from approximately the last 18–24 months are likely under-counted due to standard patent publication lag and should not be interpreted as a decline. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing volume has plateaued since 2018; core bearing design dominates the technology mix
The annual filing trend and technology composition charts together reveal a mature, structurally stable field where incremental innovation in core bearing design coexists with smaller but growing adjacent branches.
Annual filing trend
Annual filings peaked in 2018 at 85 patent records before easing to a range of 35–55 in subsequent years. The 2024–2026 bars are subject to publication lag and should be treated as provisional. The multi-year window still shows positive recent growth of 4%, consistent with a plateau rather than contraction.
↗ Hover for values · click a bar to ask EurekaTechnology composition
F16C (Shafts, bearings & couplings) commands 2,406 patent records — far ahead of all other classes — confirming that core bearing geometry and materials remain the dominant innovation focus. The next three classes, C21D (Heat treatment), C22C (Alloys), and C23C (Coating & surface deposition), each hold 300–500 records, reflecting the importance of material science and surface engineering. Downstream applications such as F16H (Gearing), B60B (Vehicle wheels), and C10M (Lubricants) represent smaller but meaningful adjacent branches.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Rolling element bearing member
A rolling element bearing member designed for use in a preselected bearing operation, such as a gas turbine engine, which develops a predetermined operating hoop tensile stress in the member includes a hardened layer contiguous with a ductile core having a hardness less than 50 Rockwell C. For example, the hardened layer is a carburized layer of high… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Rolling bearing unit for wheel supporting | 212 |
| 2 | Bearing with wireless self-powered sensor unit | 159 |
| 3 | Piezoelectric film transducer sytem for bearings | 159 |
| 4 | Rolling bearing with a sensor unit | 149 |
| 5 | Ball and roller bearings and bearing components | 125 |
| 6 | Rolling bearing part | 121 |
| 7 | Cage for ball bearing, and ball bearing | 109 |
| 8 | Pinion shaft supporting tapered roller bearing for… | 93 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D strategy
The combination of high concentration, a mature lifecycle, and active Japanese-led collaboration defines the strategic environment for any team entering or expanding in this space.
Field is at plateau — incremental gains, not paradigm shifts
The lifecycle stage is Maturity, with annual filings plateaued near the 2018 peak. The multi-year window still shows a 4% recent growth figure, suggesting the field is not in decline but is no longer in its high-growth phase. R&D teams should prioritise defensible differentiation — particularly through material science, coatings, or sensing — rather than broad foundational claims that incumbents already occupy.
Lifecycle: MatureTwo-player duopoly at the top; significant tier gap below
NSK (731 patent records) and NTN (686 patent records) together represent a commanding presence among the top 100 filers, holding 73% of that group’s combined total. SKF at 103 records is a distant third. For challengers, directly competing in core bearing design is high-risk; a more viable path is building depth in adjacent branches — coatings, lubricants, or gearing integration — where the incumbent density is lower.
High concentrationJapanese industrial ecosystems drive co-filing activity
The most active co-filing pairs are NTN and Daido Steel (7 joint filings), NSK and Kyodo Yushi (6 joint filings), NTN and NTN Toyo Bearing (6 joint filings), and JTEKT with Japan Lubricant (6 joint filings). Koyo Seiko co-files with Toyota Central R&D Labs and Denso. This pattern shows that the leading bearing makers systematically partner with steel producers, lubricant specialists, and automotive tier-1 suppliers — a supply-chain-spanning collaboration model that reinforces their comprehensive IP coverage.
Japan-centric ecosystemUS is the primary battleground; Europe and Japan are secondary but essential
The United States leads with 771 patent records at the jurisdiction level, ahead of Europe (EPO) at 576 and Japan at 419. The United Kingdom at 233 records reflects historic SKF and bearing-industry presence. China, with 139 patent records, is notably lower than its global manufacturing share — a structural gap that may reflect enforceability strategy or an emerging entry opportunity. WIPO PCT filings (73 records) indicate selective global prosecution rather than broad multimarket filing.
US-led, China emergingGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| NTN Corporation | Daido Steel Co., Ltd. | 7 |
| NSK Ltd | Kyodo Yushi Co., Ltd. | 6 |
| NTN Corporation | NTN Toyo Bearing Co., Ltd. | 6 |
| JTEKT Corporation | Japan Lubricant Co., Ltd. | 6 |
| NSK Ltd | IHI Corporation | 5 |
| Koyo Seiko Co., Ltd. | Toyota Central R&D Labs, Inc. | 5 |
| JTEKT Corporation | ENEOS Corporation | 4 |
| Koyo Seiko Co., Ltd. | Denso Corporation | 3 |
| Koyo Seiko Co., Ltd. | Japan Lubricant Co., Ltd. | 3 |
| NTN Corporation | Kawasaki Steel Corporation | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
NSK and NTN lead by volume; SKF accelerates from a smaller base
The top two players are defined by deep, broad coverage of core bearing design and material science. Below them, SKF shows the strongest recent momentum among the challengers.
NSK Ltd
NSK leads with 731 patent records and a recent filing trend of +53% versus the prior three-year period, suggesting a deliberate reinvestment in IP coverage rather than a retreat. Their technology emphasis centres on F16C33 (bearing components, 657 records), F16C19 (rolling bearings, 301 records), and C22C38 (alloy steels, 226 records) — a profile that spans geometry, load ratings, and steel composition, reflecting a vertically integrated innovation strategy.
patent records: 731NTN Corp
NTN holds 686 patent records and is growing at +21% recent versus prior period, maintaining competitive pressure on NSK. NTN’s focus on F16C33 (603 records), F16C19 (382 records), and C21D9 (heat treatment of metals, 157 records) mirrors NSK’s core priorities but shows a stronger emphasis on heat treatment processes — a potential avenue for process-level differentiation. NTN also co-files actively with Daido Steel, reinforcing its materials depth.
patent records: 686| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| NSK Ltd | 23 | ▲ +53% |
| NTN Corporation | 34 | ▲ +21% |
| AB SKF | 18 | ▲ +38% |
| The Timken Company | 1 | ▼ -90% |
| JTEKT Corporation | 1 | ▲ new entrant |
Under-served adjacent branches worth monitoring
Several IPC classes appear alongside the dominant F16C core at relatively low shares, indicating areas where patent density is thin relative to the apparent technical relevance. These are observations of relative sparsity; technical and commercial viability should be independently validated.
C23C · Coating & surface deposition
With 381 patent records and an 8% share of the technology composition, surface coating is the most populated adjacent branch but remains well below the F16C core. Advanced coatings — such as DLC (diamond-like carbon), nitride layers, or PVD treatments — directly address fatigue initiation at contact surfaces, a primary failure mechanism in rolling bearings. The relatively low incumbent density compared to F16C creates room for entrants with coating-process expertise to file protectable claims, particularly in combination with specific bearing geometries or application environments such as wind turbines or EV drivetrains.
Search this in Eureka →C10M · Lubricants
Lubricant-related filings account for 81 patent records at a 2% share, making this one of the sparser adjacent branches despite lubricant film breakdown being a direct contributor to rolling contact fatigue. The collaboration evidence shows JTEKT and NSK actively co-filing with lubricant specialists (Japan Lubricant and Kyodo Yushi respectively), suggesting incumbents are aware of this dimension but have not saturated it. For lubricant formulators or tribology-focused teams, this branch offers an entry path with lower prior-art density, especially in synthetic or bio-based formulations for high-load or elevated-temperature bearing applications.
Search this in Eureka →How leading applicants differ by technology route
Route coverage across the main technology branches in the current evidence set.
| Player | F16C 33 · Shafts, bearings & couplings | F16C 19 · Shafts, bearings & couplings | C22C 38 · Alloys | C21D 9 · Heat treatment of metals | C23C 8 · Coating & surface deposition |
|---|---|---|---|---|---|
| NSK Ltd | Strong · 657 | Moderate · 301 | Moderate · 226 | Moderate · 190 | Moderate · 137 |
| NTN Corporation | Strong · 603 | Strong · 382 | Moderate · 147 | Moderate · 157 | Moderate · 146 |
| AB SKF | Strong · 95 | Moderate · 44 | Emerging · 9 | Absent | Absent |
| JTEKT Corporation | Strong · 50 | Strong · 32 | Moderate · 12 | Moderate · 23 | Emerging · 10 |
| The Timken Company | Strong · 43 | Strong · 50 | Absent | Absent | Absent |
| Koyo Seiko Co., Ltd. | Strong · 47 | Absent | Emerging · 6 | Emerging · 8 | Absent |
| Schaeffler Technologies AG & Co. KG | Strong · 32 | Strong · 24 | Absent | Absent | Absent |
Frequently asked questions
The analysis covers 413 patent families in scope. Applicant rankings and technology branch counts are reported at the patent-record level and can exceed the family total because a single family may be filed across multiple jurisdictions or classified under multiple IPC codes.
NSK Ltd is the top applicant with 731 patent records, ahead of NTN Corp at 686 patent records. These two Japanese manufacturers hold 73% of the combined total among the hundred largest filers, indicating a highly concentrated field.
The field is at the Maturity stage. Annual filings peaked in 2018 at 85 patent records and have since plateaued in the 35–55 range. The recent three-year window still shows 4% growth, so the field has not entered decline, but it is no longer in rapid expansion.
The United States leads with 771 patent records, followed by Europe (EPO) at 576 and Japan at 419. The United Kingdom holds 233 records and China 139. WIPO PCT filings stand at 73 records, indicating selective rather than broad multimarket prosecution by most applicants.
F16C (Shafts, bearings & couplings) is overwhelmingly dominant at 2,406 patent records. The next tiers are C21D (Heat treatment of metals, 475), C22C (Alloys, 463), and C23C (Coating & surface deposition, 381), reflecting the centrality of material science and surface engineering in managing fatigue and fracture.
Yes. The most active co-filing pairs include NTN and Daido Steel (7 joint filings), NSK and Kyodo Yushi (6 joint filings), NTN and NTN Toyo Bearing (6 joint filings), and JTEKT with Japan Lubricant (6 joint filings). The dominant pattern is Japanese bearing makers partnering with steel producers and lubricant specialists, reinforcing comprehensive material-to-component IP coverage.
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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.