Seismic Isolation Bridge Patents: Leaders, Trends & White Space 2026
- Filing has cooled since 2017. The peak year in this dataset is 2017 at 3 filings, with the 2022 midpoint back down to 1 — a flat-to-declining curve, not a growth story.
- China dominates the filing map. 13 of the tracked records route through the China receiving office, more than four times the next closest jurisdictions (Japan and South Korea, 3 each).
- The field is small and fragmented. Only 25 published families sit inside this search, and recent-year momentum is flat at zero for every assignee tracked — no single filer is currently pulling ahead.
A narrow, mature filing space centred on the bearing itself
Seismic isolation for bridges is a small, well-defined patent space: 25 published families over more than a decade, concentrated overwhelmingly under E01D (Bridges) rather than spread across a broad technology stack. The core invention target has stayed the same since the earliest records in this set — the isolation bearing, most often a lead-rubber or laminated-rubber design — with springs, dampers and building-structure classes (F16F, E04H, E04B) appearing as secondary, supporting claims rather than as independent branches.
Filing activity peaked in 2017 and has not recovered since; the 2022 midpoint sits at a single filing. Because publication typically lags filing by around 18 months, the most recent years in any such trend will understate true activity, but even allowing for that lag this is not a fast-moving field. What movement there is concentrates heavily in China, with Japan, South Korea, New Zealand, Taiwan and India making up the remainder in small numbers.
Filing trend and technology composition
Twenty-five patent families, one dominant IPC subclass, and a filing curve that never regained its 2017 peak.
Filing trend
Filings ran at 3 in 2017, the high point of the dataset, and drifted down toward the 2022 midpoint of 1 and lower thereafter. The 2026 figure of 0 is partial and reflects the data cut-off rather than a sudden stop, but the multi-year direction since 2017 is downward, not upward.
Technology composition
E01D (Bridges) covers 23 of the 25 records, confirming that this search is anchored on bridge-specific structures rather than general seismic isolation. E04H, E04B and F16F each appear in roughly a quarter of records as supporting classifications for damping and structural-mounting claims, while G06F, B32B and E02D appear only once or twice each, marking them as fringe rather than core activity.
Shares are the percentage of the 25 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Seismic Isolation System Bridge Engineering with Eureka
This page is one run against one query. Ask Eureka your own question about seismic isolation system bridge engineering and every answer comes back with the patent numbers behind it.
Try EurekaThe records other filings cite
Seismic isolation bearing for bridge and bridge using the same
A seismic isolation bearing for a bridge built from rubber plates, steel plates and a laminated body, with a hermetically closed hollow portion inside the laminate densely filled with a lead plug. The lead plug is shaped with two pairs of rectangular faces set orthogonally to each other along the bridge axis and its perpendicular direction, a geometry aimed at tuning the plug's deformation behaviour under seismic load.Filed by OILES CORPORATION, published 2019-05-16 as US20190145066A1.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | JP2003055913A | Bridge base isolation device | 14 |
| 2 | CN201520939U | 单向大位移桥梁隔震橡胶支座 | 13 |
| 3 | CN105808802A | 一种铅芯橡胶支座等效线性化建模方法及其桥梁隔震应用 | 11 |
| 4 | CN115404767A | 可自复位的抗拔型三向减隔震支座及其制作方法 | 7 |
| 5 | CN203700948U | 采用双层设置拉索支座的节段高墩桥梁减隔震结构 | 7 |
| 6 | CN108360372A | 一种具备水平异性刚度及抗冲特性桥梁隔震器 | 5 |
| 7 | CN203383140U | 桥梁减隔震支座预偏置装置 | 5 |
| 8 | KR101284238B1 | Displacement control device for lrb | 5 |
| 9 | JP1998131122A | Asemismic base isolation bearing for bridge | 5 |
| 10 | US20190145066A1 | Seismic isolation bearing for bridge and bridge using the same | 4 |
Citation counts inside a searched corpus favour older records that have had more time to accumulate references; treat them as a signal of influence on the field's vocabulary, not of current commercial importance.
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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Three things stand out once the ranking and the trend are read together: where the claim density sits, why the field hasn't grown, and who is actually still active.
Claims cluster on the bridge-specific bearing, not the general isolator
Almost every record in this set is classified under E01D rather than the broader E04H seismic-isolation class used for buildings. That means the competitive claim space is the bridge bearing itself — its lead-plug geometry, laminate structure and mounting — rather than isolation theory in general.
No assignee is currently accelerating
Every tracked assignee shows zero filings in the latest year, and the dataset's own midpoint (2022) sits at just one filing. This is a field where the founding art was laid down years ago and has not since been displaced by a new wave of filers.
Filing activity is regionally concentrated, not globally distributed
China accounts for more than half of the tracked receiving-office filings, with Japan and South Korea each contributing 3 and the remainder split thinly across New Zealand, Taiwan and India. A filer entering this space should expect Chinese prior art to be the densest single obstacle.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to seismic isolation system bridge engineering, with the prior art for and against each one.
A fragmented field without a runaway leader
With only 25 families and every tracked assignee flat at zero in the latest year, this is not a field with an emerging dominant player — it is a set of research institutes, manufacturers and small filers each holding a handful of records.
OILES Corporation
A Japanese bearing manufacturer with an early, frequently structured filing on lead-plug laminated bearings; its US20190145066A1 record is the representative filing surfaced in this dataset for the bridge bearing design.
Railway Technical Research Institute
A Japanese railway-sector research body with filings tied to bridge and structural seismic isolation, reflecting the railway infrastructure application of the same bearing technology used in road bridges.
Shijiazhuang Tiedao University
A Chinese university contributing to the China-heavy filing base in this dataset, consistent with academic-industrial filing patterns common in Chinese civil-engineering patent activity.
Jiangsu University
Another Chinese academic filer in the dataset, again with no activity in the most recent tracked year, reinforcing the picture of a field whose Chinese filing base is broad but shallow rather than led by one dominant institution.
| Assignee | Recent year | YoY |
|---|---|---|
| OILES Corporation | 0 | — |
| Railway Technical Research Institute | 0 | — |
| Shijiazhuang Tiedao University | 0 | — |
| Jiangsu University | 0 | — |
| Shanghai Pudong Architectural Design & Research Institute Co., Ltd. | 0 | — |
| DAMPING SYST | 0 | — |
| BU HEUNG SYST CO LTD | 0 | — |
| Kang Yong Woo | 0 | — |
Where to take this from here
The dataset points to specific next checks rather than a single conclusion — use it to decide where to search deeper, not where to stop.
Check the bearing geometry claims directly
Since 23 of 25 records sit under E01D, any new bearing design should be checked directly against this cluster before drafting claims on lead-plug shape or laminate structure.
Explore E01D prior art in EurekaWatch for a filing restart
Flat recent-year activity across all assignees does not rule out a restart; run a fresh pull closer to the 18-month publication lag to see if 2024-2025 filings have started to appear.
Set a filing alert in EurekaLook outside E01D for adjacent claim space
The small G06F, B32B and E02D counts suggest digital monitoring, composite materials and foundation-interface claims are thinly filed relative to the bearing itself.
Search adjacent IPC classes in EurekaCommon questions on bridge seismic isolation patents
Based on this dataset, the most-cited records include a Japanese filing (JP2003055913A) and several Chinese utility and invention filings on rubber isolation bearings and their modelling. OILES Corporation's representative filing on a lead-plug laminated bearing is also a frequently referenced design. No single assignee holds a dominant share of the 25 tracked families, so influence here is spread across a handful of older, heavily-cited records rather than concentrated in one company's portfolio.
The dataset shows filing peaking at 3 records in 2017 and falling to roughly 1 by the 2022 midpoint, with every tracked assignee showing zero filings in the most recent year. This pattern is consistent with a mature, narrowly-defined technology area where the core bearing designs were established early and have not been displaced by a new wave of invention. It is worth noting that recent years are always understated in filing counts because publication lags filing by around 18 months, so some 2024-2025 activity may not yet be visible.
China accounts for 13 of the 25 tracked filings by receiving office, more than four times the count from either Japan or South Korea, which each contribute 3. New Zealand and Taiwan each add 2, and India contributes 1. This concentration means that any freedom-to-operate check for a new bridge bearing design should treat Chinese prior art as the primary obstacle to clear.
This OILES Corporation filing claims a seismic isolation bearing built from alternating rubber and steel plates with a hermetically sealed hollow portion inside the laminate, densely filled with a shaped lead plug. The plug's specific geometry, two pairs of rectangular faces set orthogonally along and across the bridge axis, is the distinguishing feature over a generic lead-rubber bearing. Anyone designing a lead-plug bearing for bridge use should compare their plug cross-section and laminate sealing method against this claim structure before finalising a design.
The technology composition data shows only 1-2 records each under G06F (digital monitoring), B32B (composite/laminate materials) and E02D (foundation interfaces), compared with 23 under the core bridge-bearing class E01D. That gap suggests sensor-integrated isolator monitoring, novel laminate composite formulations, and isolator-to-foundation interface designs are comparatively under-claimed relative to the bearing geometry itself, and are worth a closer prior-art check before assuming the space is occupied.
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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.