Diamond Core Drilling Patents: Top Companies & Filing Trends 2026
- Concentrated at the top. The top 5 assignees hold 460 of 960 records in scope (47.9%), and the top 10 hold 570 (59.4%) — a field where a handful of drilling-equipment specialists set the claim baseline.
- Filing has pulled back from its 2017 peak. Annual filings ran from 59 in 2017 to 7 in the most recent (partial) year, with the last complete-year comparison showing 2021's 37 filings falling to 14 in 2024, a -62% move over that span.
- Almost all activity sits in one IPC subclass. 920 of 960 records (95.8%) carry E21B (earth and rock drilling), while every other subclass — geophysics, controls, measurement, valves, materials — sits under 4% individually, pointing to a narrow core with thin adjacent claim coverage.
Filing growth compares 2021 (37 records) with 2024 (14) — 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 960 records in scope (CR5), not by the ranked leaders only.
What the diamond core drilling patent record shows
Diamond core drilling patenting sits almost entirely inside E21B, the earth and rock drilling subclass, with 960 records in scope drawn from filings at the USPTO, Australian, Canadian, European and PCT offices plus South Africa. The search terms anchor the set on core barrel, drill bit matrix and diamond impregnation hardware claims paired with downstream data functions — core recovery, wireline retrieval, borehole survey and core orientation — which is why a single mining- and drilling-equipment cluster of assignees accounts for roughly half of all filings.
Filing activity peaked in 2017 at 59 records and has since receded; publication lags filing by roughly 18 months, so the most recent one to two years in the trend will fill in as later-filed applications publish. Reading the trend from 2021 to 2024 — the last year that can be treated as complete — filings fell 62%, but that reflects a maturing hardware core rather than a technology in decline: claim space in the dominant subclass is heavily occupied, and adjacent instrumentation and materials classes remain comparatively open.
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Filing trend and technology composition
Two views of the same 960-record set: how annual filing volume has moved since 2017, and how the record set breaks down across IPC subclasses.
A 2017 peak followed by a pullback
Filings ran from 59 in 2017 down to 7 in the most recent partial year. The most reliable read is 2021 to 2024, where filings dropped from 37 to 14, a -62% change — treat any year after 2024 as still filling in rather than as a confirmed decline.
One dominant subclass, several thin adjacencies
E21B (earth and rock drilling) covers 920 of 960 records, 95.8% of the set. The next largest classes — G01V geophysics, G05B control systems, G01B measurement, F16K valves, G01N material testing and G01C navigation — each sit at or below 3.2%, meaning the hardware core is heavily claimed while the surrounding sensing, control and materials layers are comparatively lightly patented.
Shares are the percentage of the 960 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Diamond Core Drilling with Eureka
This page is one run against one query. Ask Eureka your own question about diamond core drilling and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
Method and system for enabling acquisition of borehole survey data and core orientation data
Filed by REFLEX INSTRUMENTS ASIA PACIFIC PTY LTD, this 2023 application describes a system and method for capturing borehole survey data and core orientation data in a single instrument trip, using a survey tool run down the drill string alongside an inner core barrel assembly that detects the tool face of the recovered core sample.The claims center on combining survey and orientation acquisition into one trip rather than the two separate runs conventional practice requires.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4866983A | Analytical methods and apparatus for measuring the oil content of sponge core | 296 |
| 2 | US5148875A | Method and apparatus for horizontal drilling | 252 |
| 3 | US5568838A | Bit-stabilized combination coring and drilling system | 223 |
| 4 | US5074366A | Method and apparatus for horizontal drilling | 194 |
| 5 | US5318123A | Method for optimizing hydraulic fracturing through control of perforation orientation | 186 |
| 6 | US4566545A | Coring device with an improved core sleeve and anti-gripping collar with a collective core catcher | 172 |
| 7 | US5335724A | Directionally oriented slotting method | 144 |
| 8 | US5318136A | Drilling process and apparatus | 116 |
| 9 | US5667025A | Articulated bit-selector coring tool | 95 |
| 10 | US5360066A | Method for controlling sand production of formations and for optimizing hydraulic fracturing through perforat… | 95 |
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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Browse MCP servers →What the data means for filing strategy
Three findings that shape where a new filing is likely to clear prior art and where it will run straight into an occupied claim space.
The hardware core is a five-company game
Top 5 assignees combine for 460 of 960 records and the top 10 for 570 (59.4%). A new entrant filing on core barrel or drill bit matrix claims is filing directly against this group's prior art, not against a fragmented field.
Volume has pulled back from its 2017 high
Annual filings fell from 37 in 2021 to 14 in 2024. That is a real pullback in new hardware filings, not a data artefact, though the most recent one to two years are still under-published and should not be read as confirming further decline.
One subclass absorbs nearly all filings
E21B covers 920 of 960 records. Every adjacent subclass — geophysics, control systems, measurement, valves, material testing, navigation — sits at 3.2% or below, which is where thinner prior art and more open claim territory sit.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to diamond core drilling, with the prior art for and against each one.
Who holds the claim space, and where activity is still moving
A small group of drilling-equipment specialists set the baseline for core barrel and bit-matrix claims; most other participants in the ranked set hold only a handful of records each.
One company sets the ceiling
The leading assignee holds more than double the fifth-place count (34 records), giving it the deepest prior-art position against any new core barrel or wireline-retrieval filing.
Related entities file jointly
The strongest co-assignee pairing links entities under a common corporate group, with 33 shared records — a pattern that suggests coordinated filing strategy across affiliated legal entities rather than independent invention.
Even active filers are slowing
Assignees still filing in the latest year are doing so at reduced volume — two records with a 50% year-on-year drop for one, 33% for another — consistent with the broader pullback from the 2017 peak rather than a single company retreating alone.
| Assignee | Recent year | YoY |
|---|---|---|
| GLOBALTECH CORP PTY LTD | 2 | -50% |
| REFLEX INSTRUMENTS ASIA PACIFIC PTY LTD | 2 | -33% |
| IMDEX Global Limited | 1 | — |
| Longyear TM Inc | 0 | — |
| Boart Longyear | 0 | — |
| Reflex Instruments Asia Pacific Pty Ltd | 0 | — |
| BOART LONGYEAR MANUFACTURING & DISTRIBUTION INC | 0 | -100% |
| Baker Hughes Holdings LLC | 0 | — |
Where to take this analysis
The dataset points to a few concrete next steps depending on whether the goal is defensive clearance or identifying open filing territory.
Map the leader's claim boundaries
With one assignee holding 136 records and a further four holding a combined 324 more, a freedom-to-operate check against the top 5 should come before any core barrel or bit-matrix filing.
Explore assignee claims in EurekaTest the under-claimed adjacencies
Sensing, control and materials subclasses each sit under 4% of records despite sitting directly next to the dominant E21B hardware claims, which is where a narrower first claim is more likely to clear.
Run a white-space search in EurekaFrequently asked questions
The field is concentrated: the top 5 assignees account for 460 of the 960 records in scope, or 47.9%, and the top 10 account for 570, or 59.4%. The leading assignee alone holds 136 records, more than double the count of the fifth-place holder at 34. This means a small group of drilling-equipment and mining-technology specialists set most of the prior art that a new filer has to clear.
Filing peaked in 2017 at 59 records a year and has declined since. The clearest complete-year comparison is 2021 to 2024, where filings dropped from 37 to 14, a 62% decrease. Filings in 2025 and 2026 look lower still, but publication typically lags filing by around 18 months, so those most recent years are undercounted and should not yet be read as a continued freefall.
Almost all activity sits in IPC subclass E21B, earth and rock drilling, which covers 920 of 960 records, or 95.8%. Every other subclass in the dataset — geophysics and surveying, control systems, length measurement, valves, material testing, and navigation — sits at 3.2% of records or below. That gap means the physical drilling hardware is heavily claimed while the surrounding sensing and control layers are comparatively open.
The under-claimed territory sits in the subclasses adjacent to the dominant hardware core: real-time borehole survey telemetry, automated core-orientation sensing, diamond impregnation material formulation, wireline retrieval control logic, drilling fluid additive chemistry, and downhole navigation gyroscopics. Each of these corresponds to an IPC subclass with 3.2% or less of total records, well below the 95.8% concentration in E21B, which suggests thinner prior art for a narrowly drafted claim in these areas.
US20230048917A1, filed by Reflex Instruments Asia Pacific, describes a system and method for capturing both borehole survey data and core orientation data in a single instrument trip down the drill string, rather than the two separate runs conventional practice requires. It matters because it sits in the survey and orientation sensing area, which is a comparatively thin part of the patent landscape compared to the dense E21B hardware core, meaning it is more likely to shape freedom-to-operate for anyone developing combined-trip survey tools than a filing in the crowded core barrel hardware space would be.
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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.