Rotary and Linear Encoders Patents: Leaders & White Space 2026
- 50% of all filings sit with five assignees. the top 5 combined for 81 of the 162 records in scope, half the entire field, while a long tail of single-digit filers fills the rest.
- Filing has been flat to declining since 2017. the peak year was 2017 at 21 filings, and the 2022 midpoint of 7 shows no sustained rebound since — though the most recent year is always undercounted due to publication lag.
- Nearly every record touches G01D, but adjacent classes are thin. 98.8% of records carry a G01D measuring classification, while H03M coding/interpolation and G01L force-sensing overlaps sit under 4% each.
What the encoder patent record actually shows
Rotary and linear encoders sit at the intersection of precision measurement and signal processing, and the patent record reflects that split. Filings cluster overwhelmingly under G01D (measuring and recording), with much smaller but recurring overlaps into G01B length measurement, H02K motor integration, and H03M coding and interpolation. The search scope here is narrow by design — it targets resolution, interpolation error, contamination tolerance, interface protocol and inductive encoder claims specifically, so the 162 records in scope are a filtered slice of the broader encoder field, not the whole of it.
That narrowness matters for reading the concentration numbers. With only 39 companies in the ranked list and the top 5 already accounting for half of all records, this is a field where a small number of established instrument and motion-control firms hold most of the occupied claim space, and where a large secondary group files once or twice and does not return.
Filing trend and technology mix
Two views of the same 162 records: how filing volume has moved year over year, and which IPC subclasses carry the claims.
Filing trend: a 2017 peak with no clear recovery
Filings peaked at 21 in 2017. The 2022 midpoint sits at 7, and the trend through the most recent complete years is flat to declining rather than growing. Because publication typically lags filing by around 18 months, the final year or two in any such series will always look thinner than actual filing activity turns out to be once records catch up.
Technology composition: G01D dominance, thin adjacencies
G01D covers 98.8% of the 162 records, confirming this is fundamentally a measurement-and-recording field. The next largest classes — F41A and G01B, each at 11.7% — and H02K at 8.0% point to real but secondary overlaps with weapons systems, length measurement and motor integration. H03M (coding/interpolation, 3.1%) and G01L (force sensing, 1.9%) are the thinnest, which is notable given the search terms explicitly target interpolation error and interface protocol claims.
Shares are the percentage of the 162 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Rotary and Linear Encoders with Eureka
This page is one run against one query. Ask Eureka your own question about rotary and linear encoders and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records, and one to read in full
GB2616606A — "Encoder" (Dyson Technology Limited, 2023-09-20)
A hybrid encoder combining an inductive absolute-position sensor with a magnetic incremental sensor. The inductive stage uses a metal target with a ramped width and an inductor coil forming part of an LCR circuit, so linear motion perpendicular to the target's width shifts the resonant frequency in a way the sensing circuit can read as absolute position. The magnetic stage layers multipole magnets on top to give finer incremental resolution.Filed by Dyson Technology Limited, this is a recent example of combining two sensing modalities in one encoder rather than relying on either alone.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20150130450A1 | Energy-self-sufficient multiturn rotary encoder and method for determining a unique position of an encoder sh… | 54 |
| 2 | US20020145108A1 | Rotary encoder | 32 |
| 3 | US9528856B2 | Energy-self-sufficient multiturn rotary encoder and method for determining a unique position of an encoder sh… | 27 |
| 4 | US8505210B2 | Absolute encoder setup indication | 27 |
| 5 | US10557676B2 | Firearm ammunition availability detection system | 26 |
| 6 | US20080149816A1 | Method and system for calibrating a rotary encoder and making a high resolution rotary encoder | 26 |
| 7 | US20190277590A1 | Firearm ammunition availability detection system | 20 |
| 8 | WO2010049682A1 | Absolute encoder setup indication | 20 |
| 9 | JP1991175319A | Correcting method for error of linear encoder | 19 |
| 10 | JP2010145203A | Linear encoder signal processing device and signal processing method | 18 |
Citation counts favour older records simply because they have had longer to accumulate citations inside this corpus; treat them as a signal of influence on subsequent filings, not of current commercial weight.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-outs from the concentration, class and geography data that bear directly on where to file or search next.
Half the field sits with five assignees
The top 5 combined for 81 of the 162 records in scope. That is a high concentration for a 39-company ranked field, and it means a new entrant's freedom-to-operate search should start with those five portfolios rather than the tail.
No sustained growth since the 2017 peak
Filing volume peaked in 2017 and the 2022 midpoint of 7 shows the field has not recovered to that level since. Several of the top assignees show 0 filings in the latest year with -100% YoY, though the newest year is always undercounted by publication lag.
US and Europe carry most of the filing volume
The United States and the European Patent Office between them account for the large majority of receiving-office activity, with WIPO PCT filings a distant third and Japan, Canada and Austria smaller still. A regional FTO check that skips EPO coverage misses a large share of the record.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to rotary and linear encoders, with the prior art for and against each one.
Who holds the ground, and where the tail begins
The ranked list covers 39 companies across all 162 records. It thins quickly: the leader holds 26 records, fifth place already drops to 10, and by tenth place it is down to 4.
One assignee holds nearly a third of the field alone
The top-ranked assignee's 26 records against a 162-record total puts it well ahead of second place, and its recent-year momentum shows 0 filings in the latest year — consistent with the field-wide slowdown rather than a company-specific pullback.
The tail starts by rank five
Fifth place already sits at 10 records, less than half the leader's count, and tenth place is down to 4. This is a field where a handful of firms built real portfolios early and most others filed opportunistically.
Co-assignment is rare and mostly internal
Only 4 co-assignee pairs appear across the dataset, and the strongest ones link a company to its own named inventors or to an affiliated manufacturing entity rather than to an external partner. There is little sign of joint-venture filing in this field.
| Assignee | Recent year | YoY |
|---|---|---|
| Renishaw plc | 0 | -100% |
| MAZTECH IND LLC | 0 | — |
| Canon Inc. | 0 | — |
| ServoSense (SMC) Ltd | 0 | — |
| IP2IPO Innovations Ltd | 0 | — |
| Crown Packaging Technology Inc | 0 | — |
| Harmonic Drive Systems Inc. | 0 | — |
| Eaton Corporation | 0 | — |
Where to take this from here
The landscape points to specific next steps depending on whether you are filing, searching, or scoping a design-around.
Run a freedom-to-operate check against the top 5
With half the field's 162 records held by five assignees, a targeted FTO search against those portfolios covers more ground than a broad keyword sweep across all 39 ranked companies.
Start a portfolio search in EurekaScope the thin classes before drafting new claims
H03M interpolation and G01L force-integration sit under 4% of records each despite being named directly in the search scope — worth checking whether that reflects genuine white space or just narrow claim drafting elsewhere.
Explore IPC white space in EurekaTreat the last two years as incomplete
The filing trend shows a drop toward the most recent year that is at least partly a publication-lag artefact; re-run the trend view periodically rather than concluding the field has stopped.
Track filing trends in EurekaCommon questions about encoder patents
The ranked list covers 39 companies across 162 records, and it is heavily front-loaded: the leading assignee alone holds 26 records, and the top 5 combined account for 81 records, half of the entire dataset. By the tenth-ranked company the count has already fallen to 4 records, so beyond the top handful the field is a long tail of occasional filers rather than a broad competitive set. Anyone doing competitive tracking should focus most of their attention on the top 5 to 10 names rather than the full ranked list.
Based on this dataset, filing peaked in 2017 at 21 records and has not returned to that level since, with the 2022 midpoint sitting at just 7. Several leading assignees show 0 filings in the most recent year, which reads as a slowdown rather than growth. That said, publication typically lags actual filing by around 18 months, so the last one to two years in any trend chart will understate real activity until later records catch up.
Almost all records in this scope, 98.8%, carry a G01D classification, which covers general measuring and recording instruments — confirming that encoders are fundamentally classified as measurement devices rather than under any single more specific code. Secondary overlaps appear in G01B (length measurement) and H02K (electric motors and generators), each around 8-12% of records, reflecting encoders built into motion systems. Coding and interpolation-specific claims under H03M are comparatively rare at 3.1%, despite interpolation error being one of the search terms used to build this dataset.
The classes named directly in the search scope but thin in record count are the clearest signal: H03M interpolation-error correction sits at 3.1% of records, and G01L force-integrated sensing and G01M self-test/balance verification each sit under 2%. That gap, next to a near-universal G01D core, suggests fewer parties have staked out interpolation-correction or integrated force-sensing claims specifically, even though the underlying search terms show the field is actively discussing them. A first claim there would likely combine an established G01D sensing element with a specific interpolation-correction or self-diagnostic method step.
GB2616606A, filed by Dyson Technology Limited, describes a hybrid encoder that pairs an inductive absolute-position sensor, built around a ramped-width metal target and an LCR resonant circuit, with a magnetic incremental sensor using multipole magnets layered on top. It blocks designs that combine those two specific sensing modalities in that specific arrangement, not inductive sensing or magnetic incremental sensing individually. A design-around would need to either use a single sensing modality, or combine inductive and magnetic sensing through a materially different mechanical or circuit arrangement than the ramped-target LCR approach claimed here.
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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.