Radial Shaft Seal Patents: Top Companies & Filing Trends 2026
Radial Shaft Seal Design and Testing Patents
One filer holds 21 of the 80 records in scope, and the top five combined account for 51.2% of all filings — this field concentrates fast past the leader. Filings peaked so far at 4 in 2020. The 2021-to-2024 span shows +50% growth (2 to 3 records a year) — real movement, but from a small base. Treat 2025 and 2026 figures as incomplete rather than as a slowdown.
- 1FEDERAL MOGUL CORPORATION21
- 2NOK CORP7
- 3KACO GMBH & CO KG5
- 4TRELLEBORG SEALING SOLUTIONS US INC4
- 5FEDERAL MOGUL WORLD WIDE LLC4
See the full radial shaft seal design and testing analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on radial shaft seal patents
Who holds the most radial shaft seal patents?
One assignee leads the ranked list with 21 of the 80 records in scope, well ahead of the fifth-placed filer at 4. The top five combined hold 51.2% of all records, so the field is concentrated at the top even though 37 companies appear across the full ranking. Anyone assessing freedom to operate should look closely at that leader’s claim scope before assuming a gap exists.
How fast is radial shaft seal patenting growing?
Filings grew 50% from 2021 to 2024, moving from 2 to 3 records a year — a real but modest acceleration rather than a surge. The peak year so far is 2020, at 4 records. 2025 and 2026 figures look lower only because publication trails filing by roughly 18 months; they should not be read as a decline.
What patent classes cover radial shaft seal technology?
F16J, the pistons-seals-and-gaskets class, covers 83.8% of the 80 records in scope and is the core class for lip geometry and contact-pressure claims. Smaller shares sit in plastics shaping (B29C, 6.3%), tyres (B60C, 5.0%), and several classes at 3.8% each including coatings, bearings, dampers and cycle frames. Because records can carry multiple classes, these shares add up to more than 100% of the record total.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Radial Shaft Seal Design and Testing covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.