Mechanical Seals & Sealless Pumps Patents: Leaders & Trends 2026
Mechanical Seals and Sealless Pumps Patents: Who Leads and Where Filings Are Growing
49.3% concentration. The top 5 assignees hold 167 of 339 records in scope — filing activity sits with a small group rather than spreading evenly. Filings ran at 11 in 2017 and reached a peak of 17 in 2022. The clean comparable growth figure is 2021 (4 filings) to 2024 (9 filings), a +125% rise over three years. Years after 2024 are still incomplete due to publication lag and should not be read as a slowdown.
- 1ASSOMA96
- 2NIKKISO CO LTD18
- 3GENERAL ELECTRIC CO18
- 4HMD SEALLESS PUMPS18
- 5SUNDYNE LLC17
See the full mechanical seals and sealless pumps 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 about this landscape
Who holds the most patents in sealless pump technology?
The assignee ranking in this dataset covers 68 companies, with the leading assignee holding 96 of the 339 records in scope — more than five times the fifth-place count of 17. The top 5 assignees combined hold 167 records, or 49.3% of the total, meaning nearly half of the field’s patent activity sits with a small group of established filers. Beyond the top 10, which together hold 64.0% of records, coverage per company thins out quickly into a long tail of single- or few-filing entrants.
Is patent filing activity in sealless pumps and mechanical seals growing?
Yes, based on the comparable complete years: filings rose from 4 in 2021 to 9 in 2024, a +125% increase over that three-year span, with 2022 as the peak year so far at 17 filings. Figures for 2025 and 2026 are still incomplete because publication typically lags actual filing by around 18 months, so those years should not yet be read as a decline. The overall trend across 2017-2026 shows sustained activity rather than a one-off spike.
What is the difference between magnetic drive pumps and canned motor pumps in the patent data?
Both are captured under the same search terms in this dataset because they solve the same underlying problem — eliminating a dynamic shaft seal — using different mechanisms: magnetic coupling across a containment shell versus a motor rotor immersed directly in the pumped fluid. The IPC data shows most records falling under F04D (non-positive-displacement pump structures, 78.8% of records) with a smaller but meaningful share touching H02K (electric motors and generators, 24.2%), reflecting that pump-body and containment claims outnumber motor-specific claims in this corpus. Practitioners distinguishing the two design families in freedom-to-operate work should check both classes rather than relying on either alone.
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 Mechanical Seals and Sealless Pumps 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.