GFRP Structural Health Monitoring Patent Snapshot
This is a small, highly concentrated field dominated by Chinese academic and state-owned-enterprise filers, with Nanchang Hangkong University holding the largest single share of patent records. Annual filing volume peaked in 2019 and has eased since, though a cluster of new academic entrants appearing in the most recent window signals continued niche interest.
Nanchang Hangkong University leads a tightly held, China-centric field
China Petroleum & Chemical Corp and its Shengli Oilfield Technical Inspection Center, each with 2 records — together these three entities account for the bulk of activity in the top-ranked applicants.
The top five filers hold 63% of the combined total among the ranked applicants visible in this query, indicating a highly concentrated visible assignee structure with limited participation from outside a small cluster of Chinese institutions and one individual filer.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Nanchang Hangkong University | 4 | |
| 2 | CHINA PETROLEUM & CHEMICAL CORP | 2 | |
| 3 | CHINA GASOLINEEUM & CHEM TECH SHENGLI OILFIELD TES… | 2 | |
| 4 | McElroy, John W. | 1 | |
| 5 | State Grid Zhejiang Electric Power Co., Ltd. Jiaxing Supply Co. | 1 | |
| 6 | Tatneft LLC (limited liability company) | 1 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 7 | SHANGHAI INST OF SPECIAL EQUIP INSPECTION & TECHN … | 1 | |
| 8 | Shanghai Jiaqi Intelligent Technology Co., Ltd. | 1 | |
| 9 | Vignans Institute of Information Technology | 1 | |
| 10 | Beihang University | 1 | |
| 11 | Chongqing University | 1 |
The leaders’ positions reflect an academically driven field: Nanchang Hangkong University’s advantage is built on acoustic-emission-based testing methods, while the oil-and-gas entities reflect industrial inspection applications for GFRP pressure vessels and pipelines.
The most recent 18–24 months of filings are subject to publication lag and likely under-represent current activity; the apparent quietness in 2025–2026 should not be read as a definitive halt. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2019 peak in filings, with acoustic-emission testing overwhelmingly dominant
Two charts together reveal that the field’s output was concentrated in a short burst and that the technology mix is heavily skewed toward one IPC class, leaving several adjacent branches thinly populated.
Annual filing trend
Activity surged to a peak of 4 patent records in 2019, fell to 2 in 2020, and then largely stalled — with only isolated filings in 2023–2025. The most recent period is subject to publication lag, so apparent activity in 2024–2025 may grow as records publish.
↗ Hover for values · click a bar to ask EurekaTechnology composition
G01N (material analysis and testing) accounts for 12 of the IPC records, dwarfing all other classes; the next seven branches — spanning plastics shaping, glass compositions, polymer additives, wind turbines, vibration measurement, and digital data processing — each contribute only 1 record, underscoring how narrowly the field is focused on non-destructive testing methods.
↗ 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.
Acoustic emission warning system for a fiberglass …
ACOUSTIC EMISSION WARNING SYSTEM FOR A FIBERGLASSMEMBER ABSTRACT OF THE DISCLOSURE An apparatus is provided for use as an on- board monitor and warning system attached to a fiberglass member to detect potentially hazardous loads by detecting and counting acoustic emis- sions produced in the member by the breakage of glass fibers. The monitor and warning… (excerpt from the patent abstract)
Open this patent in Eureka →| # | Patent | Citations |
|---|---|---|
| 1 | 一种玻璃钢声发射源三角定位方法 | 17 |
| 2 | 一种基于改进时间反转算法的玻璃纤维复合材料声发射源定位成像方法 | 13 |
| 3 | 一种基于HHT的玻璃纤维复合材料弯压损伤评价方法 | 11 |
| 4 | 一种基于经验模态分解的玻璃钢弯压应力损伤图谱定量评价方法 | 5 |
| 5 | 基于声发射的玻璃纤维增强复合材料损伤模式识别方法 | 3 |
| 6 | 一种玻璃纤维复合材料弯压损伤声发射特征参数表征方法 | 3 |
| 7 | 一种用于玻璃钢声发射检测的压力容器实验装置 | 1 |
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.
Nanchang Hangkong University
Nanchang Hangkong University holds 4 patent records — the largest share in this corpus — all focused on G01N 29 (acoustic-emission material testing). The university’s portfolio spans acoustic-emission source localization (including triangulation and time-reversal imaging methods) and damage evaluation using HHT and empirical mode decomposition, as evidenced by the most-cited records in the landscape. No momentum data is available for this applicant in the recent window, suggesting an established rather than accelerating position.
patent records: 4China Petroleum & Chemical Corp
China Petroleum & Chemical Corp and its Shengli Oilfield Technical Inspection Center together hold 2 patent records each, both in G01N 29, reflecting industrial-grade acoustic-emission inspection of GFRP pressure vessels and pipelines. Their collaboration — a parent-subsidiary co-filing — is the most active partnership in the field. Beihang University, Chongqing University, State Grid Zhejiang Electric Power, and Shanghai Jiaqi Network Technology each entered as new filers in the recent window, spanning G01N 29, G01N 3, and — in the case of Shanghai Jiaqi — F03D 17 (wind turbines).
patent records: 2Frequently asked questions
The corpus currently contains 10 patent families in scope. This is a small, specialist field, and the evidence reflects a narrow slice of global innovation activity concentrated primarily in China.
Nanchang Hangkong University leads with 4 patent records, all in the G01N 29 (acoustic-emission material testing) class. China Petroleum & Chemical Corp and its Shengli Oilfield Technical Inspection Center each hold 2 records.
Acoustic-emission testing under IPC class G01N is overwhelmingly visible, accounting for 12 of the IPC records. Methods include triangulation-based source localization, time-reversal imaging, HHT-based damage evaluation, and empirical mode decomposition.
The lifecycle evidence places the field in decline, with annual filings peaking in 2019 and easing since. Publication lag means the most recent 18–24 months may be under-counted, but the multi-year trend is downward from the 2019 peak.
China accounts for all 10 patent records. Canada, India, and Russia each have 1 record, indicating limited international prosecution. There are no evidenced filings in the United States, Europe, or via PCT in this corpus.
Two co-filing pairs are evidenced: China Petroleum & Chemical Corp’s Shengli Oilfield Technical Inspection Center with its parent company (2 joint records), and Chongqing University with State Grid Zhejiang Electric Power Co., Ltd. Jiaxing Supply Co. (1 joint record). Both are domestic Chinese partnerships; no international collaboration is recorded.
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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.