Pipeline Pigging Patents: Top Companies & Filing Trends 2026
- Filing has cooled since 2019. the peak year of the dataset (5 families) sits behind a midpoint of just 2 in 2022, pointing to a mature, consolidating field rather than a growing one.
- Material analysis dominates the IPC mix. G01N accounts for 70 of 112 records, well ahead of F16L pipe-fittings claims at 50, showing inspection sensing is the busier claim territory than mechanical pig design.
- The United States anchors filing activity. 47 records were filed there against 15 in Canada and 14 at the EPO, with WIPO PCT filings (9) trailing well behind — a signal that most applicants are not yet pursuing broad multi-jurisdiction protection.
What this patent set covers
This landscape draws on 112 patent families published between 2015 and mid-2026 that combine pipeline pigging or in-line inspection tool language with claim content on magnetic flux leakage, ultrasonic wall thickness, geometry pigs, data interpretation or pig launchers, filtered to IPC classes covering pipe fittings, material testing and pipeline transport. It is a narrow, mechanically mature corner of oilfield and midstream infrastructure IP rather than a fast-moving emerging technology.
Filing activity peaked in 2019 and has since flattened, with the most recent full and partial years sitting well below that high point. Because publication typically lags filing by around eighteen months, the 2025-2026 figures in any trend chart will understate true filing activity for those years — the real picture only firms up once later applications publish.
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Filing trend and technology composition
Two views of the same 112-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the bulk of the claim language.
A flat-to-declining filing curve
Filings ran at 4 in 2017, rose to a peak of 5 in 2019, and had fallen back to a midpoint of 2 by 2022, with 2 recorded so far in the still-publishing 2026 year. That shape is consistent with a field where the core mechanical and sensing approaches were staked out some years ago and few new entrants are pushing fresh claim territory.
Material testing outweighs mechanical pig design
G01N (material analysis and testing) leads with 70 records, roughly 1.4 times the F16L (pipes and pipe fittings) count of 50. Smaller but present clusters in G01B (measuring/dimensions, 12), H02G (cable installation, 9), F17D (pipeline transport, 7), G01R (electric/magnetic measurement, 7), F16K (valves, 4) and H01F (magnets/transformers, 4) mark the narrower adjacent branches where claim density is much lower.
Shares are the percentage of the 112 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Pipeline Pigging and In-Line Inspection with Eureka
This page is one run against one query. Ask Eureka your own question about pipeline pigging and in-line inspection and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this set
Pseudorandom binary sequence apparatus and method for in-line inspection tool
An in-line inspection tool is disclosed for inspecting the wall of a pipeline while traveling therethrough. The tool includes a transmitter, a signal generator, one or more receivers, and a decoder. The signal generator produces a pseudorandom signal, generates an inspection signal, and drives the transmitter with a convolution of the two. Receivers pick up the convoluted signal or its reflection from the pipe wall, and the decoder identifies the inspection content within the received signal.Filed by Pure Technologies Ltd., published 2010-11-18 — included here as a representative record for the signal-processing branch of in-line inspection claims.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20160231279A1 | Linkage assembly for in-line inspection tool | 85 |
| 2 | US4332277A | Pipeline pigging plug | 85 |
| 3 | US6232773B1 | Consistent drag floating backing bar system for pipeline pigs and method for using the same | 66 |
| 4 | US9310016B2 | Pig receiver assembly | 44 |
| 5 | US9518693B2 | Pig receiver assembly | 40 |
| 6 | US20100288049A1 | Pseudorandom binary sequence apparatus and method for in-line inspection tool | 39 |
| 7 | US6640655B1 | Self tracking sensor suspension mechanism | 31 |
| 8 | CN102159944A | 集成多传感器无损检测 | 26 |
| 9 | US20100117635A1 | Spiral magnetic field apparatus and method for pipeline inspection | 23 |
| 10 | US20180106762A1 | In-line inspection tool | 21 |
Citation counts reflect influence within the searched corpus and skew toward older filings; they are not a measure of current commercial relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers say about where this field stands
Reading the filing curve, the IPC mix and the citation table together points to a field with settled core claims and a small number of still-active players.
Growth has stalled, not accelerated
The peak of 5 families in 2019 has not been matched since; by the 2022 midpoint, filings had halved to 2. This is not a field attracting a wave of new capital-backed entrants — it looks more like incumbents maintaining existing portfolios.
Sensing and material testing is the busier claim space
Nearly two-thirds of the dataset sits in material analysis and testing (G01N), well ahead of pipe-fittings mechanics (F16L, 50). New filers are more likely to collide with prior art in flux-leakage and ultrasonic sensing claims than in pig body or launcher mechanics.
Filing strategy is largely US-first, not globally defensive
United States filings (47) far outnumber PCT filings (9), with Canada (15) and the EPO (14) as the next-largest receiving offices. Few applicants appear to be building broad multi-jurisdiction moats, which leaves regional white space outside North America and Europe comparatively open.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to pipeline pigging and in-line inspection, with the prior art for and against each one.
Who is active, and where the gate sits
Recent-year momentum is thin across the board: most tracked assignees show zero filings in the latest year, and the one exception, Novitech Inc, holds flat at 0% year-over-year. That pattern is more consistent with a settled field of incumbents defending existing claim territory than one with new competitive entries.
Novitech Inc holds the only active latest-year filing
Novitech Inc is the sole assignee in the tracked momentum table with a non-zero filing in the most recent year, and even that is flat at 0% year-over-year growth — a signal of maintenance filing rather than expansion.
Established names show no recent-year activity
Power Associates International, PII (Canada), Innospection Group and other tracked assignees show zero filings in the latest year. That does not mean they are inactive in the field, but it does mean their most recent claim positions predate this filing window.
Co-assignment is rare, not structural
The strongest co-assignee pair in the dataset — PII (Canada) with an individual inventor-assignee — appears just once, indicating that collaborative or jointly-owned filings are the exception rather than a common strategy in this field.
| Assignee | Recent year | YoY |
|---|---|---|
| NOVITECH INC | 1 | 0% |
| POWER ASSOCIATES INTERNATIONAL INC | 0 | — |
| PII (Canada) Ltd. | 0 | — |
| INNOSPECTION GRP LTD | 0 | — |
| Akral Solutions Inc. | 0 | — |
| Quantum Technology Ltd. | 0 | — |
| HODDE JAMES R | 0 | — |
| HOYT PHILIP M | 0 | — |
Where to take this
The filing curve and IPC mix point to a field with settled core claims and several thinner branches. The next step is usually to test a specific claim idea against the full prior art set rather than read the aggregate numbers alone.
Check a draft claim against this corpus
Run a candidate claim on geometry pig calibration, flux-leakage signal processing or launcher mechanics against the 112 families here to see how crowded that exact claim scope actually is.
Explore in Patsnap EurekaWatch the quiet incumbents
Assignees with zero recent-year filings still hold the citation-heavy foundational patents in this set; tracking their portfolios for licensing or expiry activity can surface freedom-to-operate openings.
Explore in Patsnap EurekaCommon questions about pipeline pigging patents
This dataset tracks 112 patent families published between 2015 and mid-2026 that combine pipeline pigging or in-line inspection tool claim language with specific technical content such as magnetic flux leakage, ultrasonic wall thickness measurement, geometry pigs, or pig launchers. It is a narrow, well-defined slice of the broader pipeline transport and material-testing patent space, not a count of every pigging-related filing worldwide. Because publication lags filing by roughly eighteen months, the true count for 2025 and 2026 will rise as later applications publish.
The evidence points to a flat-to-declining trend. Filings peaked at 5 families in 2019, and by the 2022 midpoint had dropped to 2, with the partial 2026 year showing 2 so far. This pattern is typical of a mechanically mature field where the dominant approaches were established some years back, rather than one experiencing a new wave of innovation or investment.
Material analysis and testing, classified under IPC subclass G01N, accounts for 70 of the 112 records, making it by far the busiest claim territory — well ahead of pipe-fittings mechanics under F16L at 50. That concentration means sensing, flux-leakage and ultrasonic wall-thickness claims sit on denser prior art than mechanical pig body or launcher design, which carries implications for anyone drafting new claims in the sensing space.
The United States is the leading receiving office with 47 filings, followed by Canada at 15 and the European Patent Office at 14. WIPO PCT filings, which typically signal an intent to pursue broad multi-jurisdiction protection, total only 9 — noticeably behind the national and regional offices. That gap suggests many applicants are prioritising North American and European protection over building global patent families, leaving other regions comparatively less contested.
Recent-year momentum data shows very little active filing: Novitech Inc is the only tracked assignee with a non-zero latest-year filing, and even that is flat year-over-year. Other tracked names, including Power Associates International, PII (Canada) and Innospection Group, show zero filings in the most recent year, though their historical portfolios include some of the most-cited records in the dataset, such as pig receiver assembly and linkage assembly patents. This suggests the field is currently defined more by defending established portfolios than by new competitive filing activity.
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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.