Roller Cone Bit Design Patents: Who Leads, Where the Gaps Are 2026
- 79.8% of all 1,132 records sit with just five assignees — this field is about as concentrated at the top as roller cone bit filings get.
- Filing peaked in 2017 at 23 and the 2021-to-2024 span shows a 50% drop, though 2025-2026 counts are still filling in under publication lag.
- E21B carries 92.8% of records while bearing, seal and lubrication classes each sit under 11% — the mechanical sub-systems are comparatively open.
Filing growth compares 2021 (8 records) with 2024 (4) — 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 1,132 records in scope (CR5), not by the ranked leaders only.
What the roller cone bit design record actually shows
Roller cone bit design patenting is not a broad, evenly spread field. It is dominated by claims tied to cone offset geometry, tooth interference, tungsten carbide inserts and metal face seals — the mechanical details that determine bearing life and cutting efficiency downhole. The scope here spans 2015 through the 2026-07-31 cut-off, drawing on 1,132 published records across that window.
The filing curve is not a straight climb. It peaked in 2017 and has since pulled back, and because publication trails filing by roughly 18 months, the most recent one or two years understate real activity rather than signal a genuine slowdown.
Filing trend and technology composition
Two views of the same 1,132-record dataset: how filing activity has moved year over year, and which IPC subclasses carry the claims.
Filing trend, 2015-2026
Filings peaked in 2017 at 23 and the 2021-to-2024 span shows a 50% decline (8 to 4). 2025 and 2026 figures are still incomplete under the usual publication lag and should not be read as a continued fall.
IPC subclass composition
E21B (earth and rock drilling) touches 92.8% of the 1,132 records, confirming this is fundamentally a wells-drilling dataset. Bearing (F16C, 10.1%), seal (F16J, 4.2%) and lubrication (F16N, 1.9%) classes are present but far thinner, and records can carry more than one class so shares add up past 100%.
Shares are the percentage of the 1,132 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Roller Cone Bit Design with Eureka
This page is one run against one query. Ask Eureka your own question about roller cone bit design and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative filing
US4199856A — Method of providing lubricant volume displacement system for a rotary rock bit
A rotary rock bit is provided having a lubrication system with an expansion space within the lubricant reservoir to accommodate changes in lubricant volume. A flexible diaphragm is located within the lubricant reservoir. The lubricant reservoir is filled with lubricant thereby moving the flexible diaphragm to a substantially completely filled position. A predetermined volume of lubricant is displaced from the lubricant reservoir by forcing a fluid through passage means in the reservoir cap, moving the flexible diaphragm and displacing a predetermined volume of lubricant thereby providing an expansion space within the lubricant reservoir.Filed by Dresser Industries, Inc., granted 1980-04-29 — a foundational lubricant-reservoir mechanism that later filings in the F16N and F16J classes still have to design around.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20080179104A1 | Nano-reinforced WC-co for improved properties | 616 |
| 2 | US5560440A | Bit for subterranean drilling fabricated from separately-formed major components | 534 |
| 3 | US4738322A | Polycrystalline diamond bearing system for a roller cone rock bit | 517 |
| 4 | US4802539A | Polycrystalline diamond bearing system for a roller cone rock bit | 282 |
| 5 | US5944129A | Surface finish for non-planar inserts | 250 |
| 6 | US6196340B1 | Surface geometry for non-planar drill inserts | 245 |
| 7 | US5415030A | Method for evaluating formations and bit conditions | 234 |
| 8 | US6189621B1 | Smart shuttles to complete oil and gas wells | 225 |
| 9 | US6868906B1 | Closed-loop conveyance systems for well servicing | 201 |
| 10 | US5305836A | System and method for controlling drill bit usage and well plan | 199 |
Citation counts favour older filings simply by virtue of being in circulation longer — treat them as a measure of influence on later art, not of current commercial relevance.
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 composition mean for filing strategy
The ranking and IPC mix point to a field where the core mechanical claims are locked up but adjacent sub-systems remain comparatively open.
Five assignees hold nearly four-fifths of the field
With the leader alone at 297 records and the top five combined at 903 of 1,132, new entrants filing on core cone geometry or insert composition are filing directly into occupied claim space. The long tail of the ranked 100 companies each holds a handful of records at most.
Activity has cooled from its 2017 peak
Filings peaked at 23 in 2017 and the last fully comparable span, 2021 to 2024, shows a 50% drop from 8 to 4. Because publication lags filing by around 18 months, 2025-2026 counts will fill in further and should not yet be read as continued decline.
Bearing, seal and lubrication claims are thin relative to E21B
E21B drilling claims cover 92.8% of records, but the mechanical sub-systems that govern bearing life — races, seals, lubricant reservoirs — sit in single digits. That gap is where claim space is least occupied relative to the field's overall density.
Joint filing is rare and tightly clustered
Only ten co-assignee pairs appear in the dataset, and the strongest links sit around a single leading assignee working with a materials partner and an individual inventor — collaboration here is the exception, not the norm.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to roller cone bit design, with the prior art for and against each one.
Who holds the roller cone bit design claim space
A small group of oilfield services companies dominates the ranking; the rest of the 100 ranked assignees each contribute a handful of records.
One assignee holds more than a quarter of the field alone
The leading assignee's 297 records against a 1,132-record total means a single filer's portfolio shapes what freedom-to-operate looks like for most other entrants before anyone else is even counted.
The drop-off after the leader is steep
Fifth place holds 31 records versus the leader's 297 — concentration is front-loaded, and the top five together account for 903 of the 1,132 records, or 79.8% of the field.
Recent-year filing has gone quiet across the leaders
Every one of the top assignees shows zero recorded filings in the latest year in this dataset. Given the roughly 18-month publication lag, this reads as incomplete recent data rather than an actual halt in filing by these companies.
| Assignee | Recent year | YoY |
|---|---|---|
| Smith International, Inc. | 0 | — |
| Baker Hughes Holdings LLC | 0 | — |
| Dresser Industries, Inc. | 0 | — |
| Halliburton Energy Services, Inc. | 0 | — |
| Weatherford/Lamb, Inc. | 0 | — |
| Chevron U.S.A. Inc. | 0 | — |
| Vareo International Industries Ltd. | 0 | — |
| HUGHES TOOL COMPANY | 0 | — |
Where to take this analysis
The concentration and thin-class findings above point to specific next checks before committing engineering or legal resources.
Run a freedom-to-operate check on bearing and seal claims
F16C, F16J and F16N classes are comparatively thin against the 1,132-record total, but thin does not mean clear — check the leading assignee's specific claim scope in these classes before filing.
Explore in Patsnap EurekaTrack the leading assignee's portfolio directly
With one assignee holding 297 of 1,132 records, understanding exactly which sub-claims it holds shapes where a new filing has room to differentiate.
Explore in Patsnap EurekaWatch for the 2025-2026 filing correction
Recorded zero-filing years across leading assignees are very likely a publication-lag artefact rather than a real stop — revisit the trend once later years fill in.
Explore in Patsnap EurekaCommon questions on roller cone bit design patents
The ranking is concentrated: the leading assignee alone holds 297 of the 1,132 records in scope, and the top five combined hold 903 records, or 79.8% of the field. That leaves a long tail among the remaining ranked assignees, most holding only a handful of records each. Anyone assessing freedom-to-operate in this space should focus first on the leader's portfolio, since it covers a large share of the occupied claim space before any other filer is considered.
No — filing peaked in 2017 at 23 records and has since declined, with the last fully comparable span (2021 to 2024) showing a 50% drop from 8 to 4. That said, publication lags filing by roughly 18 months, so the 2025 and 2026 figures in any dataset pulled today will understate real activity and should not be read as evidence of a continuing slide. A fair read is that formal roller cone bit claim activity has cooled from its mid-2010s peak, not that it has stopped.
Earth and rock drilling claims under E21B cover 92.8% of the 1,132 records, but the mechanical sub-systems tied to bearing life sit far lower: F16C (bearings) at 10.1%, F16J (seals) at 4.2%, and F16N (lubrication) at 1.9%. That gap suggests cone offset geometry and insert composition are heavily claimed, while metal face seal design, lubricant reservoir mechanisms and bearing race coatings carry comparatively less claim density relative to the field's overall size.
US4199856A, assigned to Dresser Industries and granted in 1980, claims a lubricant volume displacement system using a flexible diaphragm inside the lubricant reservoir to accommodate volume changes during operation. It sits squarely in the F16N and F16J territory that remains comparatively thin in this dataset. Because it is a foundational mechanism in a still-lightly-claimed area, any new lubrication or seal-reservoir design should be checked against it directly rather than assumed clear simply because the overall class share is low.
Within this dataset, concentration is high: five assignees hold 79.8% of all 1,132 records, and ten hold 88.0%. That is a steep drop-off from a single leader at 297 records, through fifth place at 31, to tenth at just 13. Practically, this means most of the ranked 100 assignees are minor filers, and competitive dynamics in roller cone bit design are set almost entirely by a small handful of oilfield services companies rather than by a broad, fragmented field of entrants.
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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.
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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.