Chainsaw Patents: Who Leads, Where the Gaps Are 2026
- 44.3% of all 742 records sit with the five leading assignees, so freedom-to-operate work in this field starts by clearing a small set of portfolios, not a diffuse crowd.
- Filings fell from 37 in 2021 to 17 in 2024 a 54% drop over that three-year span — the clearest complete-year signal the dataset offers, since 2025 and 2026 are still filling in.
- B27B sawing-wood claims cover 70.6% of records while clutch and brake mechanisms (F16D, 4.0%) and gearing (F16H, 3.2%) are claimed far less often, despite sitting inside the same machines.
Filing growth compares 2021 (37 records) with 2024 (17) — 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 742 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks patent filings at the intersection of chainsaw mechanics and cutting safety — chain brakes, kickback mitigation, chain tensioning, bar lubrication, chain speed control and emission compliance — across 742 published records filed between 2015 and mid-2026. The search combines core chainsaw hardware terms with the specific safety and operating mechanisms that generate most of the litigated and cited claim language in this space.
Because a single chainsaw design can be claimed under several IPC subclasses at once — a chain-tensioning mechanism might sit in B27B, F16H and B25F simultaneously — the technology composition below is read by subclass share of the full record set, not as mutually exclusive buckets. Patent families, not raw document counts, are the fairer unit for judging how occupied a given claim space actually is.
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Filing trend and technology composition
Two views of the same 742 records: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
Filing trend, 2017–2026
Filings ran from 23 in 2017 to a peak of 37 in 2021, then declined to 17 by 2024 — a complete-year drop of 54%. 2025 and 2026 figures are still low because publication typically lags filing by around 18 months; they should not be read as a continuation of the decline until later data fills in.
IPC subclass composition
B27B (sawing wood) appears on 70.6% of the 742 records, confirming it as the structural core of the field. A01G (horticulture and forestry, 27.5%) and B23D (planing, broaching and sawing, 15.8%) are the next-heaviest classes, while F16D clutches and brakes (4.0%) and F16H gearing (3.2%) — both directly relevant to kickback and speed-control mechanisms — carry comparatively light claim density.
Shares are the percentage of the 742 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Chainsaws and Cutting Safety with Eureka
This page is one run against one query. Ask Eureka your own question about chainsaws and cutting safety and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this dataset
Quick-action chain tensioning device for a chainsaw, and such mechanism and method (US20140106915A1)
The filing describes a hinged-cover lever arm that displaces the drive sprocket toward the guide bar to slacken the chain for demounting, then reverses that displacement on closing to pre-tension it. A gear transmission can use the running forces generated at ordinary cutting speed to automatically maintain chain tension without manual adjustment.Filed by Husqvarna AB, published 2014-04-17.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20140166323A1 | Kickback Reduction for Power Tools and Machines | 159 |
| 2 | US5528835A | Chain saw tensioning apparatus | 66 |
| 3 | US5353506A | Motor-driven chain saw having a guide bar | 58 |
| 4 | US20140106915A1 | Quick-action chain tensioning device for a chainsaw, and such mechanism and method | 56 |
| 5 | US5345686A | Cutting arrangement for a motor-driven chain saw | 53 |
| 6 | US6877233B1 | Chain saw adjuster mechanism with locking teeth | 50 |
| 7 | US5896670A | Chain tensioner for chain saw | 50 |
| 8 | US4884340A | Chain saw attachment for lawn trimmer | 50 |
| 9 | US20020124421A1 | Chain saw | 49 |
| 10 | US6032373A | Methods and apparatus for adjusting chain saw tension | 44 |
Citation counts reflect influence within the searched corpus and skew toward older filings; they are not a measure of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Reading the concentration, trend and class data together points to where claim space is occupied and where it is not.
The top of the field is tight
Just five assignees account for 44.3% of all 742 records in scope, and the top ten hold 55.4%. Any clearance search in kickback mitigation or chain tensioning should expect to run into a small number of dominant portfolios before reaching the long tail.
Filing activity has cooled from its 2021 peak
The peak year was 2021 at 37 filings; by 2024, the last complete year in the dataset, filings had fallen to 17 — a 54% decline. That is a genuine complete-year signal, distinct from the naturally thin 2025-2026 counts caused by publication lag.
Mechanical sawing claims dominate; brake hardware is thin
B27B sawing-wood claims sit on 70.6% of records, while F16D clutch-and-brake mechanisms — the class most directly tied to kickback-brake hardware — appear on only 4.0%. That gap suggests brake and clutch integration is claimed far less densely than the sawing mechanism itself.
Filing activity concentrates in US and European offices
The United States (167) and the European Patent Office (126) lead as receiving offices, ahead of WIPO PCT filings (60) and Australia and Canada (54 each). A filing strategy built only around US and EP coverage would miss a meaningful share of the activity routed through PCT.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to chainsaws and cutting safety, with the prior art for and against each one.
Who holds the ground, and where new entrants have room
The assignee ranking covers 100 companies returned by the data endpoint — it is the full ranking available, not a top-50 or top-100 cut. Concentration is real at the top, but recent-year momentum shows most leading assignees with no new filings in the latest year, which is at least partly a publication-lag artefact rather than a sign of withdrawal.
One assignee holds a clear lead
The leading assignee's 141 records are well ahead of fifth place at 21 and tenth place at 13 — a steep drop-off that marks this as a leader-plus-long-tail field rather than an evenly split one.
A long tail of smaller filers
Beyond the top ten assignees, who together hold 55.4% of the 742 records, the remaining ranked companies each hold comparatively small counts — the pattern of a mature mechanical field with many incremental improvers rather than few blocking players outside the leaders.
Co-filing is limited and concentrated
Only 10 co-assignee pairs appear across the dataset, and the strongest pairs cluster around a small number of named inventors and one leading corporate assignee, suggesting most portfolios here are built through internal R&D rather than joint filing.
| Assignee | Recent year | YoY |
|---|---|---|
| Black & Decker Corp | 0 | — |
| Husqvarna AB | 0 | — |
| Blount Inc | 0 | — |
| Robert Bosch GmbH | 0 | — |
| Ponsse Oy | 0 | — |
| Andreas Stihl AG & Co KG | 0 | — |
| Positec Power Tools (Suzhou) Co., Ltd. | 0 | — |
| MTD Products Inc | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is clearance, licensing or new filing.
Run a freedom-to-operate check against the top 10
With 55.4% of records held by ten assignees, a targeted FTO pass against just those portfolios covers more than half the field's claim density before any broader search is needed.
Explore assignee portfolios in EurekaProbe the brake and gearing white space
F16D and F16H classes carry the lowest claim density of the eight subclasses tracked here, despite governing kickback-brake and auto-tensioning hardware — a candidate area for a first-mover filing.
Search IPC white space in EurekaTrack post-2024 filings as they publish
Because publication lags filing by roughly 18 months, the true 2025-2026 filing count will only become visible over the next few quarters — worth monitoring rather than concluding the field has gone quiet.
Set a filing alert in EurekaCommon questions about chainsaw and cutting-safety patents
One assignee leads clearly with 141 records in this dataset, well ahead of the fifth-place holder at 21 and tenth place at 13. The top five assignees combined hold 44.3% of all 742 records in scope, and the top ten hold 55.4%. That leader-plus-long-tail pattern means clearance work should prioritise the leading portfolios first, since they cover a disproportionate share of the claim space.
Filings peaked in 2021 at 37 and fell to 17 by 2024, a 54% decline over that three-year span, using 2024 as the most recent complete year of data. Figures for 2025 and 2026 look lower still, but that is expected because publication typically lags actual filing by around 18 months, so those years are not yet fully reported. The honest read is a real cooling from the 2021 peak, not a field going to zero.
B27B, the sawing-wood subclass, appears on 70.6% of the 742 records in scope, making it the structural core of the field. A01G (horticulture and forestry) follows at 27.5% and B23D (planing, broaching and sawing) at 15.8%. Because records can carry multiple IPC classes, these shares overlap rather than sum to 100%, reflecting how a single chainsaw design typically spans several claim categories at once.
The classes tied most directly to kickback-brake hardware and auto-tensioning transmissions — F16D clutches and brakes at 4.0% of records and F16H gearing at 3.2% — carry noticeably lighter claim density than the core sawing mechanism itself. That gap suggests mechanical brake-actuation linkages, load-responsive bar lubrication, and gear-driven auto-tensioning systems are comparatively under-claimed relative to how central they are to chainsaw safety performance.
US20140166323A1, 'Kickback Reduction for Power Tools and Machines,' is the most-cited record in this dataset with 159 citations, well ahead of the next-most-cited filings on chain tensioning apparatus. High citation counts inside a searched corpus tend to favour older filings simply because they have had more time to accumulate citations, so this reflects influence rather than current commercial dominance.
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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.