String Trimmer Patents: Top Companies & Filing Trends 2026
- Filing activity nearly quadrupled, rising 267% from 3 filings in 2021 to 11 in 2024 as electrification renewed interest in line-feed and shaft designs.
- The top 5 assignees hold 44.3% of all 210 records in scope, with the leader alone accounting for 30 filings — a concentrated core surrounded by a long tail of single- and few-filing entrants.
- 91.0% of records sit in A01D, the harvesting and mowing class, while adjacent brush, plastics-shaping and engine classes each carry under 10% — a sign of where claim space is still open.
Filing growth compares 2021 (3 records) with 2024 (11) — 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 210 records in scope (CR5), not by the ranked leaders only.
What the string trimmer patent record actually shows
String trimmers and brush cutters sit at an odd intersection of mechanical simplicity and dense claim history: a spinning line or blade, a shaft, a guard, and a feed mechanism. That simplicity is deceptive. Line feed mechanisms and cutting-head designs carry some of the most-cited patents in the corpus, and later filers have had to work around claims filed decades ago rather than around each other. The 210 records in scope span 2015 through the current data cut-off, covering everything from fixed-line heads to hybrid mower-edger-trimmer carriages.
Filing activity is not evenly spread. A small group of assignees, several tied to the same family of named inventors, account for most of the record, while dozens of others appear once or twice with a narrow mechanical variant. Publication lags filing by roughly 18 months, so the most recent years in any trend understate real activity — the 2024 figure is the last one worth treating as complete.
Filing trends and technology composition
The trend line and the IPC breakdown below are drawn directly from the 210 records in scope. Read the most recent year or two as a floor, not a ceiling — publication delay means later filings are still arriving.
Filing activity: a peak, a lull, then a rebound
Filings peaked at 18 in 2017, fell back over the following years, and then grew 267% from 3 in 2021 to 11 in 2024 — the clearest sign of renewed R&D investment in the field, likely tied to cordless and electric platform redesigns.
Where the claims concentrate
A01D (harvesting and mowing) covers 91.0% of the 210 records, making it the default class for any trimmer or cutter mechanism. B26B (hand-held cutting tools) and A01G (horticulture and forestry) sit well behind at 10.0% and 7.1%, with plastics-shaping (B29C), engine classes (F01B, F02B) and brushes (A46B) all under 8% — each a narrower, less-crowded route into the same problem.
Shares are the percentage of the 210 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on String Trimmers and Brush Cutters with Eureka
This page is one run against one query. Ask Eureka your own question about string trimmers and brush cutters and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this field
US6862871B2 — Hybrid mower, edger, trimmer, blower
A carriage device for a string trimmer includes an axle frame supporting at least two wheels. A main frame includes an axle mounting section for adjustably securing the axle frame and a shaft receiving section shaped to receive the shaft of a string trimmer. The axle mounting section includes a plurality of connecting areas for selectively adjusting a height of the axle frame, and the axle frame is preferably laterally adjustable relative to the main frame.Filed by Vincent D. Morabit, part of a tightly linked family of named-inventor filings that co-occur repeatedly in this dataset.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20180035606A1 | Smart Interactive and Autonomous Robotic Property Maintenance Apparatus, System, and Method | 425 |
| 2 | US6519857B1 | Fixed line head for flexible line rotary trimmers | 113 |
| 3 | US6148523A | Line feed mechanism for a line trimmer | 100 |
| 4 | US5109607A | Automatic line trimmer head | 85 |
| 5 | US4841929A | Portable rotary power tool | 75 |
| 6 | US4285128A | Spool feed mechanism for line fed grass trimmer | 60 |
| 7 | US20120066913A1 | Trimmer Head with Automatic Trimmer Line Feed Mechanism | 59 |
| 8 | US6314848B2 | Self-contained flexible aerodynamic cutting element with matching head | 59 |
| 9 | US6014812A | Battery powered vegetation trimmer | 58 |
| 10 | US5303532A | Mower support apparatus and system | 57 |
Citation counts inside a searched corpus favour older records — they measure influence on later filings, not current commercial relevance.
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Three patterns stand out once the records are pulled apart: where the citation weight sits, how concentrated ownership is, and which receiving offices matter for freedom-to-operate work.
Old line-feed and head patents still anchor the field
The most-cited record in the corpus, US20180035606A1, covers autonomous property-maintenance robotics, but the next tier down — US6519857B1, US6148523A, US5109607A — are all line-feed or trimmer-head mechanisms dating to the late 1980s through early 2000s. New entrants building a feed mechanism are still working in the shadow of these.
A concentrated core with a long single-filer tail
The top 5 of 52 ranked assignees account for 93 of the 210 records in scope, and the leader alone holds 30. Below tenth place the ranking thins quickly, with many assignees appearing only once or twice — evidence of a crowded core mechanism surrounded by narrow, opportunistic filings.
US filings dominate, Europe and Australia follow
Of the receiving offices in scope, the United States carries 101 records, well ahead of Europe (EPO) at 38, Australia at 17, Canada at 16 and WIPO/PCT filings at 14. A freedom-to-operate search that skips non-US offices will still miss a meaningful share of active claims.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to string trimmers and brush cutters, with the prior art for and against each one.
Who is filing, and who has gone quiet
Ownership in this field clusters around a small number of assignees, several of them related individual inventors rather than corporations, plus a handful of established outdoor power equipment manufacturers.
One assignee holds the largest single share
The top-ranked assignee in this dataset accounts for 30 of the 210 records in scope, nearly a third of the top-5 combined total, and sets the baseline that later entrants have designed around.
A tightly linked inventor family drives several entries
Three named individuals — tied together through 10 co-assignee pairings — repeatedly co-file, with the strongest pairs sharing 11 and 9 records respectively. This looks less like independent competition and more like one filing group working across several related mechanical variants.
Recent-year activity has gone quiet at the top
Every one of the highest-ranked assignees, including the field leader, shows zero filings in the latest year, with one recording a full -100% year-on-year drop. Given the roughly 18-month publication lag, this understates true activity but still signals that the next filing wave has not yet surfaced in public records.
| Assignee | Recent year | YoY |
|---|---|---|
| Black & Decker Corp | 0 | — |
| MORABIT VINCENT D | 0 | — |
| White Consolidated Industries Inc | 0 | — |
| AERO FLEX TECH | 0 | — |
| Proulx Mfg | 0 | — |
| Techtronic Cordless GP | 0 | -100% |
| MORABITO MICHAEL Z | 0 | — |
| MORABITO CHRISTOPHER J | 0 | — |
Where to take this analysis
The dataset points to a crowded core and several narrower openings. The next step is usually a targeted freedom-to-operate check or a claim-gap search on one of the under-claimed branches identified above.
Map the line-feed claim thicket
Line feed mechanisms carry the oldest, most-cited claims in this field. Before filing a new mechanism, a claim-by-claim comparison against the highest-cited records is the fastest way to find what is actually open.
Explore claim mapping in EurekaCheck the co-filing cluster for licensing risk
The tightly linked inventor family behind several top filings suggests a concentrated ownership structure. Understanding who controls that portfolio matters before designing near it.
Run an assignee deep-dive in EurekaTest the under-claimed branches
Vibration damping, line-consumption metering and harness comfort each show far fewer filings than the core cutting mechanism. A quick prior-art pull on any of these can confirm how open they really are.
Search white space in EurekaCommon questions about string trimmer and brush cutter patents
Ownership in this dataset is concentrated: the top 5 assignees out of 52 ranked companies account for 44.3% of all 210 records in scope, and the single largest assignee alone holds 30 records. Below the top 10, which together hold 72.4% of records, the ranking thins into a long tail of assignees with only one or two filings each. This pattern suggests a small number of established players control the core mechanism while smaller entities file narrow variants around it.
The overwhelming majority, 91.0% of the 210 records in scope, fall under IPC class A01D, covering harvesting and mowing mechanisms broadly. Smaller but meaningful clusters exist in B26B (hand-held cutting tools, 10.0%), A01G (horticulture and forestry, 7.1%), and B29C (plastics shaping, 6.7%), reflecting the mix of cutting-head, shaft and component-material innovation within the field. Because a single record can carry multiple IPC classes, these shares add up to more than 100%, and the classes should be read as overlapping technical facets rather than exclusive categories.
Filings grew substantially in the recent complete period, rising 267% from 3 in 2021 to 11 in 2024. Earlier activity peaked at 18 filings in 2017 before dipping, so the field has cycled through at least one prior wave already. Data beyond 2024 should be read cautiously: publication typically lags actual filing by around 18 months, so the apparent drop-off toward 2026 reflects incomplete records rather than a genuine slowdown.
US6862871B2 covers a carriage device that attaches to a string trimmer shaft, with an adjustable axle frame and mounting section that let the height and lateral position of the wheels be changed, and in some configurations allows rotational adjustment relative to the trimmer. It is specifically framed around hybrid mower-edger-trimmer-blower use and mulcher-system compatibility. Anyone designing a wheeled attachment or carriage for a handheld trimmer shaft, particularly one with adjustable geometry, should check this claim set directly rather than assuming the core cutting mechanism is the only relevant prior art.
The clearest openings sit outside the dominant A01D cutting-mechanism cluster: vibration-damping shaft couplings, adjustable line-consumption metering, harness load-distribution design, and guard geometry for heads that mix line and blade cutting all show materially fewer filings than the core mechanism classes. These branches are still governed by general mechanical prior art, so a first claim there needs to be specific about the physical mechanism rather than the outcome. A targeted search on any one of these is more productive than a broad search across A01D as a whole.
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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.