Rolling Bearing Sealing Technology Patent Landscape
Rolling Bearing Sealing Technology Patent Landscape in 2026
Rolling bearing sealing is a mature, highly concentrated field dominated by Japanese and European bearing manufacturers, with NSK Ltd holding the largest single-applicant position among the top hundred filers. Annual filing volume has eased back from its 2017 peak, signaling a field in consolidation rather than expansion.
NSK leads a tightly held field; top five filers command two-thirds of ranked activity
NSK Ltd ranks first among the top hundred filers with 492 patent records, placing it well ahead of JTEKT Corporation (305) and NTN Corporation (287). The top five applicants — NSK, JTEKT, NTN, AB SKF, and Schaeffler Technologies — collectively account for 68% of the combined total across the hundred largest filers, indicating a highly concentrated competitive structure.
The tier gap between the first three Japanese incumbents and the rest of the field is substantial: NSK’s count is more than five times that of the fifth-ranked Schaeffler (97 patent records). Below rank five, applicant counts fall sharply, with NOK Corporation at 59 and Koyo Seiko at 52, suggesting a long tail of specialists and niche players rather than a second-tier challenger cluster.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | NSK Ltd | 492 | |
| 2 | JTEKT Corporation | 305 | |
| 3 | NTN Corporation | 287 | |
| 4 | AB SKF | 192 | |
| 5 | SCHAEFFLER TECHNOLOGIES AG & CO KG | 97 | |
| 6 | NOK Corporation | 59 | |
| 7 | Koyo Seiko Co Ltd | 52 | |
| 8 | AGH University of Science and Technology | 48 | |
| 9 | Nakanishi Metal Works Co Ltd | 39 | |
| 10 | SKF Industrie SpA | 38 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Koyo Sealing Techno Co Ltd | 38 | |
| 12 | SKF GmbH | 36 | |
| 13 | MinebeaMitsumi Inc | 24 | |
| 14 | SKF IND TRADING & DEV CO NV | 19 | |
| 15 | NTN-SNR Roulements | 15 | |
| 16 | RIV-SKF Officine di Villar Perosa | 13 | |
| 17 | Seiko Instruments Inc | 13 | |
| 18 | Toyota Motor Corporation | 10 | |
| 19 | ThyssenKrupp AG | 10 | |
| 20 | Aisin Seiki Co Ltd | 10 |
The incumbents’ entrenched positions imply that new entrants face high prior-art density in core sealing geometries (F16C and F16J). Competitive differentiation is more likely to come from application-specific adaptations — such as wheel-bearing integration, sensor-equipped seals, or new-material formulations — than from fundamental seal geometry innovation.
Filing counts for 2024–2026 are subject to publication lag and are likely under-counted; the apparent decline in those years should not be read as a sharper drop than the underlying trend warrants. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity has eased from the 2017 peak; core seal and bearing classes dominate the technology mix
The filing trend and technology composition together show a field whose foundational innovation cycle has plateaued, while the IPC class distribution reveals where adjacent application pull could create targeted entry points.
Annual filing trend
Filings peaked in 2017 at 143 records and have trended downward since, reaching 90 in 2022 and 78 in 2023. The 2024 and 2025 figures (54 and 37 respectively) reflect publication lag and should be treated as provisional lower bounds, not confirmed declines. The multi-year window still reflects substantial cumulative output, but the directional signal points to a mature, consolidating field.
↗ Hover for values · click a bar to ask EurekaTechnology composition
The two dominant IPC classes — F16J (Pistons, seals & gaskets) and F16C (Shafts, bearings & couplings) — account for the overwhelming share of classified records, confirming that activity is tightly anchored to core sealing and bearing mechanics. Vehicle-wheel applications (B60B) and velocity/acceleration sensing (G01P) are the next-largest branches, pointing to integration trends with automotive and instrumented bearing sub-systems. Further out, pump, gearing, conveying, and electric-motor classes each carry modest counts, marking adjacent but under-served application zones.
↗ 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 bearing comprising a sealing gasket and an…
This rolling bearing comprises an outer ring (<b>4</b>), an inner ring (<b>6</b>), rolling bodies (<b>10</b>) arranged between the outer ring and the inner ring, one a sealing gasket (<b>20</b>) mounted on a first ring (<b>4</b>) and extending towards the second ring (<b>6</b>), to the extent that a sealing edge (<b>26</b>) of said sealing gasket is in… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Rolling bearing unit | 118 |
| 2 | Rolling bearing | 92 |
| 3 | Rolling bearing unit with sealing device | 73 |
| 4 | Radial lip seal with interposed bearing | 70 |
| 5 | Rolling bearing and rolling bearing device | 64 |
| 6 | Sealing arrangement for a cardan spider bush | 63 |
| 7 | Rolling bearing device | 62 |
| 8 | Seal device for rolling bearing | 62 |
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 investment decisions
Four structural observations — maturity, concentration, collaboration patterns, and geographic spread — define the strategic context for anyone assessing entry or differentiation options in rolling bearing sealing.
Decline stage: consolidation, not growth
The lifecycle evidence labels this field as Decline, with annual filings easing back from the 2017 peak. Core seal geometry is heavily patented; the most productive R&D positions will be in application-specific adaptations, material science, or sensing integration rather than foundational seal designs. Teams should audit freedom-to-operate carefully before committing to the dominant F16C/F16J space.
Lifecycle: DeclineTop five hold two-thirds of ranked output
With 68% of the top-hundred filers’ combined records held by five incumbents, the field leaves limited room for undifferentiated entries. The gap between rank three (NTN, 287 records) and rank four (AB SKF, 192) suggests even the second European tier is substantially behind the Japanese leaders. Challengers must target application niches or geographic gaps rather than competing head-on in core bearing-seal geometry.
High concentrationJTEKT–Uchiyama and JTEKT–Koyo Sealing lead co-filing activity
The most active co-filing pair is JTEKT Corporation with Uchiyama Industries (21 joint filings), followed by JTEKT with Koyo Sealing Techno (17) and NTN with Nakanishi Metal Works (13). Uchiyama Industries also appears alongside Aisin Seiki, NTN, and Toyota Motor, positioning it as a key seal-component supplier within the Japanese automotive ecosystem. These clusters signal that supplier–OEM co-development is the dominant collaboration model; independent entrants may find licensing or joint-development with a Tier-1 supplier the fastest route to relevance.
Supplier–OEM clustersJapan and China lead by filing volume; Europe and the US are secondary
Japan is the leading filing jurisdiction, followed by China, then Europe via the EPO, and the United States. Germany, Poland, the United Kingdom, South Korea, and France each carry meaningful but smaller counts. The strong China presence, partly driven by domestic applicants such as C&U Co Ltd and Shanghai-based entities, indicates growing local manufacturing interest. Teams targeting Asian markets should assess freedom-to-operate in both the Japan and China national phases.
Japan-first, China risingGo 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 |
|---|---|---|
| JTEKT Corporation | Uchiyama Industries Co Ltd | 21 |
| JTEKT Corporation | Koyo Sealing Techno Co Ltd | 17 |
| NTN Corporation | Nakanishi Metal Works Co Ltd | 13 |
| Uchiyama Industries Co Ltd | Aisin Seiki Co Ltd | 10 |
| NTN Corporation | Uchiyama Industries Co Ltd | 8 |
| Uchiyama Industries Co Ltd | Toyota Motor Corporation | 8 |
| JTEKT Corporation | Aisin Seiki Co Ltd | 7 |
| JTEKT Corporation | Toyota Motor Corporation | 7 |
| JTEKT Corporation | JTEKT Sealing Techno Corporation | 7 |
| Koyo Seiko Co Ltd | Koyo Sealing Techno Co Ltd | 5 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
NSK and JTEKT lead on volume; SKF enters recent-period rankings as a new momentum player
The top two applicants are both Japanese bearing manufacturers with broad technology focus across core seal and bearing classes; SKF’s recent-period entry signals European portfolio activity worth monitoring.
NSK Ltd
NSK leads all applicants with 492 patent records, concentrated in F16C 33 (shafts, bearings & couplings), F16J 15 (pistons, seals & gaskets), and F16C 19. Its recent filing momentum shows a 56% decline versus the prior period, consistent with the field’s overall maturation and suggesting the portfolio is shifting from accumulation to maintenance. NSK’s scale still gives it the broadest prior-art position in core seal geometries.
492 patent recordsAB SKF
AB SKF ranks fourth overall with 192 patent records, with technology emphasis on F16J 15 and F16C 33. Notably, SKF is classified as a new entrant in the recent filing period, meaning it appears in the current window without a comparable prior-period baseline — a signal worth watching for a European leader reasserting patent activity in this domain. The SKF group’s presence is distributed across several legal entities (SKF GmbH, SKF Ind. SpA, SKF Ind. Trading & Dev.), which may understate consolidated group activity.
192 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| NSK Ltd | 23 | ▼ -56% |
| NTN Corporation | 20 | ▼ -47% |
| JTEKT Corporation | 15 | ▼ -37% |
| AB SKF | 15 | ▲ new entrant |
| Schaeffler Technologies AG & Co KG | 9 | ▼ -10% |
| AGH University of Science and Technology | 2 | ▲ new entrant |
Under-served branches: wheel-bearing integration and instrumented seals
Below the dominant F16C/F16J core, several IPC branches carry meaningful but relatively sparse counts, pointing to application zones where the prior-art density is lower and technical demand is growing.
B60B · Vehicle wheels & tyres — wheel-hub seal integration
B60B accounts for 224 patent records, making it the largest branch outside the core sealing classes, yet its share of total classified records remains at roughly 4%. Automotive electrification is driving demand for sealed wheel-hub bearing units with tighter contamination control and longer service intervals. The realistic entry path is through co-development with automotive OEMs or Tier-1 axle suppliers, leveraging existing seal formulation know-how applied to EV-specific load and thermal profiles.
Search this in Eureka →G01P · Velocity & acceleration — sensor-integrated bearing seals
G01P carries 161 patent records at a 3% share, reflecting activity in speed-sensor and ABS encoder rings integrated into bearing seal assemblies. This branch sits at the intersection of mechanical sealing and electronic sensing — a technically demanding combination that few applicants have addressed comprehensively. Teams with competencies in elastomer tooling and signal-conditioning electronics could find differentiated space here, particularly for railway, wind-turbine, and industrial-robot bearing applications where condition monitoring is becoming standard.
Search this in Eureka →How leaders differ by technology route across core and adjacent IPC classes
Strength of each leader across the main technology routes.
| Player | F16J 15 · Pistons, seals & gaskets | F16C 33 · Shafts, bearings & couplings | F16C 19 · Shafts, bearings & couplings | F16C 41 · Shafts, bearings & couplings | G01P 3 · Velocity & acceleration |
|---|---|---|---|---|---|
| NSK Ltd | Strong · 461 | Strong · 472 | Strong · 338 | Emerging · 74 | Emerging · 55 |
| JTEKT Corporation | Strong · 264 | Strong · 257 | Strong · 196 | Emerging · 27 | Emerging · 30 |
| NTN Corporation | Strong · 271 | Strong · 274 | Strong · 195 | Emerging · 16 | Absent |
| AB SKF | Strong · 166 | Strong · 160 | Moderate · 74 | Emerging · 9 | Emerging · 21 |
| Koyo Seiko Co Ltd | Strong · 58 | Strong · 65 | Moderate · 26 | Emerging · 6 | Moderate · 21 |
| Schaeffler Technologies AG & Co KG | Strong · 72 | Strong · 70 | Moderate · 23 | Emerging · 9 | Absent |
Frequently asked questions
NSK Ltd is the leading applicant with 492 patent records among the top-hundred filers, ahead of JTEKT Corporation (305) and NTN Corporation (287). All three are Japanese bearing manufacturers with broad coverage of the core F16C and F16J classes.
The field is in a Decline lifecycle stage. Annual filings peaked in 2017 at 143 records and have eased since. Filing counts for 2024 and 2025 are subject to publication lag and should be treated as provisional, but the directional trend from 2018 onward is one of consolidation rather than expansion.
Japan is the leading filing jurisdiction, followed by China, Europe (EPO), and the United States. Germany, Poland, the United Kingdom, South Korea, and France each carry additional national-phase activity. The China count reflects both foreign applicants seeking protection and a growing cohort of domestic Chinese filers.
The most-cited titles include ‘Rolling bearing unit’ (118 citations), ‘Rolling bearing’ (92), ‘Rolling bearing unit with sealing device’ (73), ‘Radial lip seal with interposed bearing’ (70), and ‘Rolling bearing and rolling bearing device’ (64). These foundational documents cover integrated seal-bearing unit designs and are central prior art for any new filing strategy.
JTEKT Corporation and Uchiyama Industries are the most active co-filing pair with 21 joint filings, followed by JTEKT with Koyo Sealing Techno (17) and NTN with Nakanishi Metal Works (13). Uchiyama Industries appears in several additional pairs, marking it as a key sealing-component partner within the Japanese automotive supply chain.
Outside the dominant F16C and F16J classes, the vehicle-wheel integration branch (B60B, 224 records at roughly 4% share) and the velocity/sensing branch (G01P, 161 records at roughly 3% share) are the largest adjacent zones but remain relatively sparse compared to core classes. Further out, branches covering pumps (F04D), gearing (F16H), conveying (B65G), and electric motors (H02K) each carry low counts, representing observation-stage adjacent areas rather than confirmed opportunities.
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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.
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