GFRP Porosity & C-Scan QC Patent Snapshot 2026
The GFRP porosity and C-Scan quality-control patent space is small and highly concentrated, with Riverwood International Corp holding the largest share of the top-ranked filers. Filing activity peaked in 2018 and has since eased sharply, leaving the field in a decline stage with selective new entrants emerging in non-destructive testing.
Riverwood International leads a highly concentrated, US-anchored field
Riverwood International Corp holds the top position with 9 patent records, followed by TPI Composites Inc with 7 and Saudi Arabian Oil Co with 6, making the top three applicants the visible force among all ranked filers.
The top five filers account for 67% of the combined total across the ranked applicants visible in this query, indicating a pronounced concentration with a steep drop-off after the leading tier. K-2 Corporation at 4 records and TSUU Corp K at 2 records mark the clear boundary between the leading cluster and the long tail of single-record holders.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Riverwood International Corp | 9 | |
| 2 | TPI Composites Inc | 7 | |
| 3 | Saudi Arabian Oil Co | 6 | |
| 4 | K-2 Corporation | 4 | |
| 5 | TSUU CORP K | 2 | |
| 6 | Aktsionernoe Obshchestvo Obninskoe Nauchno-Proizvodstvennoe Predpriyatie | 2 | |
| 7 | PORTER MARK A | 2 | |
| 8 | HUNAN UNIV OF SCI & TECH | 1 | |
| 9 | WILLIAM D GOLDSWORTHY | 1 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 10 | Jiangxi Province Investment Group Co Ltd | 1 | |
| 11 | MILITANA SALVATORE G | 1 | |
| 12 | Graphic Packaging International LLC | 1 | |
| 13 | Shandong Zhongfu New Materials Co Ltd | 1 | |
| 14 | Guizhou Ganxing Coal Industry Co Ltd | 1 | |
| 15 | Aramco Services Co | 1 | |
| 16 | JOHN A BUNNELL | 1 | |
| 17 | Shell Oil Co | 1 |
The leaders’ positions reflect distinct strategic orientations — Riverwood in fiber-board processing, TPI Composites in plastics shaping, and Saudi Arabian Oil Co in material analysis and testing — suggesting the field is fragmented across application verticals rather than unified around a single inspection methodology.
Filing data for the most recent 18–24 months is subject to publication lag and may understate current activity; the apparent absence of records in 2023–2024 should be interpreted cautiously. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2018 spike has not been sustained; testing and shaping dominate the IPC mix
The annual filing trend reveals an isolated burst of activity in 2018 followed by a multi-year retreat, while the technology composition chart shows that plastics shaping (B29C) and material analysis (G01N) together anchor the field’s technical scope.
Annual filing trend
Activity spiked to 9 records in 2018 and has been intermittent since, with small rebounds in 2021 and 2025. The 2023–2024 gap likely reflects publication lag rather than a complete halt; the overall trajectory places the field in a decline stage relative to its 2018 peak.
↗ Hover for values · click a bar to ask EurekaTechnology composition
B29C (Shaping of plastics) is visible in with 31 records, followed by B27N (Particle/fibre board) and G01N (Material analysis and testing) at 11 each. G01N is the branch most directly tied to inspection and QC workflows, yet it ranks third — indicating that manufacturing-process patents outnumber dedicated inspection patents in this corpus. G06T (Image data processing) appears with only 2 records, signaling limited coverage of computational C-Scan analysis.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Pre-stressed pultruded glass fiber reinforced lumber
A pre-stressed pultruded glass fiber reinforced thermoplastic lumber suitable for demanding construction environments, particularly marine and outdoor applications, features a solid core composed of a thermoplastic, such as PVC, blended with 15% to 40% by weight of pelletized chopped strand glass fibers. Pre-tensioned elongated continuous fiber… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Method for forming articles of reinforced composit… | 117 |
| 2 | Apparatus for winding filament about three axes of… | 64 |
| 3 | Method of fabricating hollow frame structures for … | 29 |
| 4 | Cellulose-based end-grain core material and compos… | 22 |
| 5 | Quality control for sucker rods | 16 |
| 6 | Fiber reinforced braided ski core and method and a… | 14 |
| 7 | Method for forming articles of reinforced composit… | 11 |
| 8 | Core of ski board reinforced by fiber and apparatu… | 9 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
Riverwood International Corp
Riverwood International Corp leads the ranked corpus with 9 patent records, concentrated in B27N (Particle/fibre board) sub-classes. Its portfolio is oriented toward fiber-composite manufacturing process rather than inspection, meaning its dominance in record count does not translate directly to C-Scan or porosity-detection prior art. No recent momentum data places it among new or accelerating filers in the current period.
patent records: 9Saudi Arabian Oil Co
Saudi Arabian Oil Co holds 6 patent records with the strongest orientation toward material analysis and testing (G01N 25 and G01N 21) and image data processing (G06T 7), making it the most strategically relevant player for C-Scan QC applications. Its affiliate Aramco Services Co co-filed on at least one record. No momentum trend is cited for Saudi Arabian Oil Co in the evidence; Aktsionernoe Obshchestvo Obninskoe Nauchno Proizvo… is the sole applicant flagged as a new entrant in NDT testing.
patent records: 6Frequently asked questions
The corpus covers 19 patent families in scope. It is a small, specialized space, which means that even a handful of new filings can shift the composition meaningfully.
Riverwood International Corp leads with 9 patent records, focused on fiber-board and particle-board processing sub-classes rather than inspection methods directly. Saudi Arabian Oil Co, at 6 records, is the strongest presence in material analysis and testing, which is the IPC branch most relevant to C-Scan QC.
The field is in a decline stage. Annual filing volume peaked in 2018 at 9 records and has eased sharply since. The most recent 18–24 months are subject to publication lag, so some undercount is expected, but the multi-year trend is negative.
The United States is the primary jurisdiction with 14 records, followed by Europe (EPO) with 9. WIPO (PCT) and Finland each carry 3 records. Australia, Canada, China, Japan, and Russia each appear at 2 records, indicating that US and European protection are the primary targets for applicants in this space.
Three co-filing pairs are observed: Saudi Arabian Oil Co with Aramco Services Co; Guizhou Ganxing Coal Industry Co Ltd with Hunan University of Science and Technology; and Guizhou Ganxing Coal Industry Co Ltd with Jiangxi Province Investment Group Co Ltd. Each pair shares exactly one co-filed record, indicating opportunistic rather than sustained collaboration.
A63C (Skates, skis and water sport composites), D04C (Braiding and lace structures), and B65D (Containers and packaging) each appear at 6 or fewer records — well below the visible B29C class at 31 records. These branches represent adjacent areas where fiber-composite porosity control is technically relevant but patent coverage remains sparse.
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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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