Horizontal Directional Drilling Patents: Leaders & Trends 2026
- Five companies hold 51.5% of all 1,760 records in scope, and the top ten push that to 60.1% — this is a concentrated field with a short list of gatekeepers.
- Filings fell 41% from 2021 to 2024, the last year the data can treat as complete, after peaking at 130 in 2020.
- E21B earth & rock drilling covers 83.4% of records, while adjacent classes like geophysics (6.4%) and pipe fittings (4.4%) sit far behind — signalling where claim space is thinnest.
Filing growth compares 2021 (91 records) with 2024 (54) — 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 1,760 records in scope (CR5), not by the ranked leaders only.
What the horizontal directional drilling patent record actually shows
Horizontal directional drilling (HDD) patenting spans steering and navigation systems, drilling fluid formulations, bore path planning, and pullback mechanics for installing pipe and cable without open trenching. The search underlying this page pulls 1,760 published records filed or published between 2015 and mid-2026, filtered to documents that combine core HDD terms with specific technical concerns such as pilot bore steering, inadvertent returns, and soil condition. Publication lags filing by roughly 18 months, so the most recent filing years understate real activity.
The record set is dominated by drilling-hardware and navigation assignees, with a smaller but persistent cluster of biotech-flavoured classes tied to drilling fluid additives — a reminder that fluid chemistry claims often ride alongside mechanical steering claims in the same family.
Filing trends and technology composition
Two views of the same 1,760-record set: how filing volume has moved year over year, and how records split across IPC subclasses. Because a single record can carry more than one class, the class shares add up to more than 100%.
Filings rose to a 2020 peak, then pulled back
Annual filings climbed from 86 in 2017 to a peak of 130 in 2020, then declined; the -41% move from 91 filings in 2021 to 54 in 2024 is the clearest complete-year comparison available, since 2025 and 2026 are still filling in under publication lag.
E21B dominates; fluid and biotech classes trail
E21B (earth & rock drilling) appears in 83.4% of the 1,760 records, confirming that most HDD patenting is still filed as drilling/wellbore art. Geophysics (G01V, 6.4%), drilling-fluid materials (C09K, 5.4%) and pipe fittings (F16L, 4.4%) form a second tier, with microorganism and fermentation-related classes (C12N, C02F, C07H, C12P) appearing at 2-3% each — evidence of a smaller but recurring biochemical-additive thread inside the fluid claims.
Shares are the percentage of the 1,760 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Horizontal Directional Drilling with Eureka
This page is one run against one query. Ask Eureka your own question about horizontal directional drilling and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records anchoring this field
Drilling fluid for use in horizontal directional drilling operations
Methods of circulating a drilling fluid while drilling a shallow wellbore that is highly deviated or horizontal. The drilling fluid comprises an aqueous base fluid, iota carrageenan, partially hydrolyzed polyacrylamide, and a divalent cation selected from calcium, magnesium, or a combination of the two. The shallow wellbore is no greater than about 610 meters below the earth's surface, at an inclination of about 55 to 125 degrees from vertical.Filed by Halliburton Energy Services, this record ties a specific fluid chemistry to a defined depth and inclination window rather than claiming drilling fluid broadly.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6315062B1 | Horizontal directional drilling machine employing inertial navigation control system and method | 373 |
| 2 | US6308787B1 | Real-time control system and method for controlling an underground boring machine | 251 |
| 3 | US6223826B1 | Auto-extending/retracting electrically isolated conductors in a segmented drill string | 235 |
| 4 | US6389360B1 | Automated bore planning method and apparatus for horizontal directional drilling | 205 |
| 5 | US6484818B2 | Horizontal directional drilling machine and method employing configurable tracking system interface | 194 |
| 6 | US5879110A | Methods for encapsulating buried waste in situ with molten wax | 156 |
| 7 | US4631136A | Non-polluting non-toxic drilling fluid compositions and method of preparation | 147 |
| 8 | US20040028476A1 | System and method for automatically drilling and backreaming a horizontal bore underground | 145 |
| 9 | US20130176139A1 | Advanced drill string communication system, components and methods | 141 |
| 10 | US6454025B1 | Apparatus for directional boring under mixed conditions | 130 |
Citation counts reflect influence inside the searched corpus and skew toward older filings — treat them as a signal of prior importance, not of current filing activity.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the concentration and trend data mean for filing strategy
Three patterns stand out once the ranking, the trend line, and the IPC mix are read together.
A short list of gatekeepers controls half the field
The top five assignees combine for 906 of the 1,760 records in scope, and the top ten extend that to 60.1%. New entrants are filing into a space where the steering-system and navigation-control fundamentals are already heavily claimed by a small group.
Volume has pulled back from its 2020 peak
Filings peaked at 130 in 2020, then fell from 91 in 2021 to 54 in 2024 — the last year unaffected by publication lag. That is a real slowdown in complete-year data, not an artefact of recent years still filling in.
Drilling and wellbore claims still dominate
E21B accounts for the overwhelming majority of records, while geophysics, fluid materials and pipe-fitting classes each sit under 7%. The biochemical-additive cluster (C12N, C02F, C07H, C12P) is small but consistent, suggesting fluid formulation is a narrower but still-active filing lane.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to horizontal directional drilling, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Syngenta Participations AG | BASF Enzymes LLC | 24 |
| Syngenta Participations AG | Vermeer Manufacturing | 16 |
| The Charles Machine Works, Inc. | SELF KELVIN P | 11 |
| The Charles Machine Works, Inc. | DOCK MATTHEW L | 11 |
| The Charles Machine Works, Inc. | PAYNE DAVID R | 10 |
| Vermeer Manufacturing Company | SMITH RICHARD K JR | 8 |
| Vermeer Manufacturing Company | RUNQUIST RANDY R | 8 |
| Vermeer Manufacturing Company | ROZENDAAL PETER C | 8 |
Only 10 co-assignee pairs appear in the dataset, and the strongest links sit between a small number of firms — evidence that most HDD patenting happens inside a single organisation rather than through joint filings.
The assignee landscape
The ranking covers 100 companies across the full 1,760-record set. Filing is heavily front-loaded: five firms hold just over half of all records, and momentum among the largest names has cooled sharply in the most recent year.
One firm holds more than double the fifth-place count
The top-ranked assignee's 395 records dwarf the fifth-place figure of 43, pointing to a single dominant filer whose navigation and steering-system patents anchor much of the field's most-cited prior art.
A steep drop-off after the top ten
Tenth place holds 27 records, well below the leader's 395 — the field narrows quickly from a handful of major filers into a long tail of smaller, more specialised entrants.
Even leading filers have slowed in the latest year
Several of the largest historical filers show zero or sharply reduced activity in the latest year, including a -100% YoY drop at one long-standing filer and a -60% YoY drop at another. Given publication lag, this understates true recent filing but still signals a cooling pace among incumbents.
| Assignee | Recent year | YoY |
|---|---|---|
| Vermeer Manufacturing Company | 2 | -60% |
| Merlin Technology, Inc. | 1 | — |
| The Charles Machine Works, Inc. | 0 | -100% |
| Halliburton Energy Services, Inc. | 0 | — |
| Syngenta Participations AG | 0 | — |
| Vermeer Manufacturing | 0 | — |
| New Railhead Manufacturing, LLC | 0 | — |
| Herrenknecht AG | 0 | — |
Where to take this analysis
The concentration at the top and the thin coverage in a few adjacent branches both point to specific next moves depending on whether the goal is freedom-to-operate or new filing.
Map freedom-to-operate against the leader's portfolio
With one assignee holding 395 of 1,760 records, any new steering-system or navigation filing should be checked against that portfolio first, not the field average.
Run a freedom-to-operate check in EurekaProbe the under-claimed fluid-additive branches
Biochemical additive classes sit at 2-3% of records each — thin enough that a well-drafted claim may find open space rather than dense prior art.
Explore white space in EurekaTrack momentum, not just headcount
Several top-ranked filers show sharp YoY declines in the latest year; watch whether that continues once 2025-2026 publications catch up.
Set up monitoring in EurekaCommon questions about HDD patenting
The dataset's leading assignee holds 395 of the 1,760 records in scope, more than double the fifth-place count of 43. That single firm's steering-system and navigation-control patents also account for several of the most-cited records in the field, including patents on inertial navigation control and real-time boring machine control. The gap between the leader and the rest of the ranked field is unusually wide, which matters for anyone doing a freedom-to-operate review in navigation or steering hardware.
Filings peaked at 130 in 2020 and then declined to 54 by 2024, a 41% drop from the 91 filed in 2021 — the clearest complete-year comparison available. Data from 2025 and 2026 is still incomplete because publication typically lags filing by about 18 months, so it would be premature to call the trend still falling based on those years alone. The honest read is that complete-year filing activity has cooled from its 2020 high.
US10400153B2, assigned to Halliburton, claims a drilling fluid formulation for shallow, highly deviated or horizontal wellbores, built around an aqueous base fluid, iota carrageenan, partially hydrolyzed polyacrylamide, and a calcium or magnesium divalent cation. The claims are bounded by depth (no greater than about 610 meters) and inclination (roughly 55 to 125 degrees from vertical), which narrows what it blocks. It does not claim drilling fluid broadly — a formulation outside that chemistry or depth/inclination window would sit outside its scope.
E21B, covering earth and rock drilling for wells, appears in 83.4% of the 1,760 records and is by far the dominant class. Geophysics and surveying (G01V) and drilling-fluid materials (C09K) follow at 6.4% and 5.4% respectively, with pipe fittings (F16L) at 4.4%. A smaller cluster of biochemical classes tied to fluid additives — C12N, C02F, C07H and C12P — each sit around 2-3%, indicating a narrower but recurring filing lane in fluid chemistry.
The thinnest coverage relative to the core drilling and navigation claims sits in biodegradable drilling-fluid additives, real-time pullback force monitoring, and soil-condition-adaptive steering control — all areas where the underlying IPC classes register in the low single-digit percentages of the 1,760-record set. Bore path re-planning algorithms and inadvertent-return detection sensors are also comparatively under-claimed. These are not guarantees of clear freedom to operate, but they are areas where filing density is measurably lower than in core steering and navigation art.
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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.