Subsea Production System Patents: Leaders vs. Long Tail 2026
- Filing has cooled since its 2018 peak. 52 families in 2018 fell to 13 by the midpoint year of 2022, with no rebound visible in the record so far.
- Claims cluster almost entirely in one IPC subclass. 738 of 739 families sit in E21B (earth & rock drilling), with separation (B01D) and marine vessel (B63B) classes trailing far behind.
- The citation leaders are all pre-2015 art. The five most-cited records, led by US7093661B2 and US6460621B2, were filed well before this dataset's window — current filings are building on decades-old foundations.
Filing growth compares 2021 (29 records) with 2024 (8) — 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 739 records in scope (CR5), not by the ranked leaders only.
What the subsea production system patent record shows
Subsea production system patents cover the hardware that lets a well be completed, controlled and processed on the seabed rather than on a platform: subsea trees, subsea manifolds, and the separation and processing skids that increasingly sit downstream of the wellhead. The search underlying this page combines title and abstract terms for subsea trees and subsea processing with a tight IPC filter on drilling and well-completion classes, so the 739 families captured here are the technical core of the field rather than every offshore-adjacent filing.
Filing activity is concentrated in a small set of jurisdictions — the United States, United Kingdom, the EPO and Norway account for most receiving offices — which tracks the geography of North Sea and Gulf of Mexico operators. Publication typically lags filing by around 18 months, so the most recent year in any chart understates real activity; treat the last one to two years as a floor, not a ceiling.
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Filing trend and technology composition
Two views of the same 739-family dataset: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
A peak in 2018, then a steady decline
Filings ran at 34 in 2017 and climbed to a peak of 52 in 2018. By the midpoint year of 2022, output had fallen to 13, and the trend line through to 2026 shows no recovery — this reads as a maturing, consolidating claim space rather than an expanding one.
Almost everything sits in E21B
738 of 739 records classify under E21B (earth & rock drilling for wells), confirming the search is well-targeted to subsea completions hardware. The next largest classes — B01D (separation processes, 55 records) and B63B (marine vessels, 33 records) — mark the two adjacent areas where subsea processing and topside/vessel integration claims are filed, at a fraction of the volume of the core class.
Shares are the percentage of the 739 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Subsea Production System Subsea Systems with Eureka
This page is one run against one query. Ask Eureka your own question about subsea production system subsea systems and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited subsea tree and subsea production art
US9702215B1 — Subsea tree and methods of using the same
A subsea tree built around a master block with a flow hub, flow bore, swab valve and master valve, paired with a side-mounted choke block. The swab valve closes so that flow is routed through the choke, and the method includes a flow-reversal step through the same bore — a configuration aimed at reducing the intervention hardware needed at the wellhead.Filed by FMC Technologies, Inc.; published 2017-07-11.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7093661B2 | Subsea production system | 134 |
| 2 | US6460621B2 | Light-intervention subsea tree system | 128 |
| 3 | US20030145991A1 | Subsea production system | 118 |
| 4 | US5992526A | ROV deployed tree cap for a subsea tree and method of installation | 100 |
| 5 | WO2005047646A1 | Apparatus and method for recovering fluids from a well and/or injecting fluids into a well | 91 |
| 6 | US20020070026A1 | Light-intervention subsea tree system | 90 |
| 7 | US20100025044A1 | Subsea well intervention systems and methods | 88 |
| 8 | US5010956A | Subsea tree cap well choke system | 84 |
| 9 | US5884706A | Horizontal subsea tree pressure compensated plug | 77 |
| 10 | US5706897A | Drilling, production, test, and oil storage caisson | 74 |
Citation counts are drawn from a searched corpus and skew toward older filings that have had more time to accumulate references — read them as markers of foundational influence, 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 numbers mean for a filing decision
Three findings stand out once the counts are put next to each other, and each has a direct bearing on where new claims are likely to survive examination.
Growth has flattened, not accelerated
After a 2018 peak of 52 families, output nearly quartered by 2022 with no sign of a rebound through to the most recent complete years. This is consistent with a technology where the core hardware architecture — the subsea tree, the manifold — is largely settled and filing has shifted to incremental variants.
Claim space is almost entirely in one subclass
Only one family in the dataset falls outside E21B, meaning nearly every filer is contesting the same drilling/completions classification. The secondary classes — separation (B01D) and marine vessels (B63B) — are an order of magnitude smaller and represent the more open adjacent ground.
The influential art predates this window
The five most-cited records in the corpus were all filed before the 2015 start of this dataset's coverage, with citation counts running from 91 to 134. Anyone filing today is building claims on top of art that is now roughly two decades old, which is where freedom-to-operate checks should start.
Collaboration is thin and concentrated
Only ten co-assignee pairs appear across the dataset, and the strongest single relationship links one subsea entity to ONESUBSEA LLC at a count of six. Most filers are prosecuting independently rather than jointly, which narrows where licensing-in opportunities are likely to surface.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to subsea production system subsea systems, with the prior art for and against each one.
Who is filing, and where the field is thinning out
The assignee ranking (rendered separately) is dominated by a handful of established subsea equipment names, several of which show zero filings in the latest year — a signal that even the leaders are pausing rather than pushing new volume through the office.
Recent-year output has gone flat across the leaderboard
ENPRO SUBSEA recorded a -100% year-on-year drop to zero, and several of the largest historical filers — including the two Cameron-linked entities and Vetco Gray — show zero filings in the latest year. Given the 18-month publication lag, some of this is reporting delay rather than a true stop, but the pattern is broad enough across the leaderboard to be a real signal.
One subsea/OneSubsea relationship anchors the network
The strongest co-assignee link in the dataset — six shared families between a UK-registered subsea IP entity and ONESUBSEA LLC — suggests a formal joint-development or licensing arrangement rather than incidental overlap. The next-strongest pairs run at half that count or less.
Filing follows the North Sea and Gulf of Mexico
The United States leads as receiving office, but the UK, EPO, WIPO/PCT and Norway together outweigh it, reflecting where the operators and equipment builders active in this space actually deploy hardware. A filing strategy limited to the US alone would miss the majority of this activity.
| Assignee | Recent year | YoY |
|---|---|---|
| ENPRO SUBSEA | 0 | -100% |
| Subsea 7 Norway AS | 0 | — |
| Subsea IP UK Limited | 0 | — |
| Cameron International Corporation | 0 | — |
| Vetco Gray Inc. | 0 | — |
| Equinor Energy AS | 0 | — |
| FMC Corporation (US) | 0 | — |
| FMC Technologies, Inc. (US) | 0 | — |
Turning this landscape into a filing or freedom-to-operate decision
The trend and class data narrow down where to look next; the specific claim language is where the real risk and the real opportunity sit.
Check freedom-to-operate against the citation leaders
The most-cited records in this dataset are all decades old and heavily referenced by everything that followed — start any clearance review there rather than with recent filings.
Run a freedom-to-operate check in Eureka →Map the under-claimed branches before drafting
Subsea separation, manifold instrumentation and intervention tooling carry far fewer families than the core tree architecture and may leave room for a defensible first claim.
Explore white space in Eureka →Watch for renewed filing from paused leaders
Several top assignees show zero filings in the latest year; given publication lag, a return to filing may only become visible in the record over the next reporting cycle.
Track assignee activity in Eureka →Common questions about subsea production system patents
In this landscape, it means filings whose title or abstract reference a subsea production system, subsea tree, or subsea processing, and whose claims fall under IPC classes for well completion and drilling hardware such as E21B33/035, E21B43/01 and E21B43/36. This captures the subsea tree itself, subsea manifolds, and the separation or processing equipment installed on the seabed rather than topside. It excludes general offshore platform or pipeline patents that do not touch these specific completion classes.
The dataset's assignee ranking is led by long-established subsea equipment suppliers and their corporate successors, several of which trace back through Cameron, FMC and Vetco Gray lineages. Notably, many of these same leaders show zero filings in the most recent year, which given an 18-month publication lag may reflect a genuine slowdown or simply filings not yet published. Co-filing is limited to about ten pairs, so most of these companies prosecute independently.
Filings peaked at 52 families in 2018 and had fallen to 13 by the 2022 midpoint, with no recovery visible through the most recent years in the data. This pattern is consistent with a core architecture — the modern subsea tree and manifold design — that has largely settled, pushing new filing toward incremental variants rather than fundamentally new configurations. It may also reflect broader offshore capex cycles, which this dataset cannot isolate on its own.
The strongest signal is the gap between the core E21B classification, which holds 738 of 739 families, and adjacent classes like separation processes (B01D, 55 records) and marine vessels (B63B, 33 records), which are filed at a fraction of that volume. Sub-areas such as subsea separation skid controls, manifold flow-metering integration, and subsea water treatment for reinjection show thinner claim density than the tree architecture itself. That does not guarantee an application will clear examination, but it marks where competitors have staked out less ground.
Citation counts in a searched corpus like this one favour older filings simply because they have had more years to accumulate references — the top-cited record here, at 134 citations, predates the dataset's 2015 start by a wide margin. Treat high citation counts as a marker of foundational influence on the field, not as a signal that a patent is currently the most commercially important. Recent, highly relevant filings will systematically look under-cited by this measure alone.
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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.