Seat Belt & Restraint Patents: Top Companies & Filing Trends 2026
- 48.3% concentration. The top 5 assignees hold 126 of 261 records in scope — nearly half the field sits with a small cluster of restraint-system specialists.
- Filing has cooled since 2020. Annual filings peaked at 9 in 2020 and had fallen to 1 by 2022, suggesting the core mechanical claims are largely staked out.
- B60R dominates by design. Every record in scope carries a B60R classification; secondary activity in seat structures, force sensing and textile treatments is comparatively thin.
What this landscape covers
This review covers 261 published records filed between 2015 and 2026 that combine seat belt system, occupant restraint system or pretensioner retractor terminology with claims touching load limiters, webbing material, buckle switches, occupant-size adaptation or regulatory crash testing, restricted to IPC classes B60R22, B60R21 and D03D1. It is a mechanical and electromechanical safety-systems field rather than a materials or software one — the classification data below shows how narrowly claims cluster around vehicle occupant protection hardware.
Publication typically lags filing by around 18 months, so the most recent year in the trend below understates actual filing activity and should be read as a floor, not a ceiling.
Filing trends and technology composition
Two views of the same 261-record dataset: filing volume by year, and how records distribute across IPC subclasses.
Filing trend, 2017–2026
Filings ran at 7 in 2017, peaked at 9 in 2020, and had dropped to 1 by the 2022 midpoint — a pattern consistent with a mechanically mature field where the dominant claim space was staked out early, plus an undercount in the final years pending publication.
Technology composition by IPC subclass
Because a single record can carry several IPC codes, these shares are measured against all 261 records and sum to more than 100%. B60R appears in 100.0% of records by construction of the search; B60N (seat structure, 3.8%), G01L (force measurement, 2.3%) and B60J (door and window fittings, 1.9%) show where secondary engineering activity concentrates, while buckle hardware (A44B, 1.5%), gas-generant chemistry (C06D, 1.1%), textile dyeing (D06P, 1.1%) and distance/gyroscope sensing (G01C, 1.1%) remain minor branches.
Shares are the percentage of the 261 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Seat Belt and Occupant Restraint Systems with Eureka
This page is one run against one query. Ask Eureka your own question about seat belt and occupant restraint systems and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative filing
Seat belt buckle engagement detector and seat belt system (Takata Corporation)
A seat belt buckle engagement detector supplies electricity from a battery to a seat belt warning lamp through a current-limiting resistance via a by-pass circuit. Even with the ignition switch off, the circuit reads whether the buckle switch is on or off and feeds a corresponding signal — ground potential when engaged, battery potential when not — into the seat belt system, letting the system carry out its warning process regardless of ignition state.Filed by Takata Corporation; published 2001-06-07.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5413378A | Method and apparatus for controlling an actuatable restraining device in response to discrete control zones | 633 |
| 2 | US5626359A | Method and apparatus for controlling an actuatable restraining device in response to discrete control zones | 316 |
| 3 | US5788281A | Vehicle occupant restraint system | 186 |
| 4 | US6254127B1 | Vehicle occupant sensing system including a distance-measuring sensor on an airbag module or steering wheel a… | 181 |
| 5 | US6264236B1 | Occupant restraint system | 108 |
| 6 | US3905615A | Inflatable body and head restraint | 102 |
| 7 | US20050073187A1 | Four-point seat belt system with buckle-lowering belts | 93 |
| 8 | US20090132128A1 | Occupant monitoring and restraint status system | 91 |
| 9 | US5181739A | Seat belt system with comfort control | 84 |
| 10 | US5244231A | Seat belt system with comfort control | 82 |
Citation counts favour older filings simply because they have had more time to accumulate citations inside the searched corpus — read them as a signal of influence on later design, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-outs from the concentration, classification and citation data above.
Claim space is already crowded at the core
With the top 5 assignees combined holding 126 of the 261 records in scope, and the top 10 reaching 64.0%, new entrants filing on core pretensioner, load-limiter or buckle-switch mechanics are filing directly over dense prior art rather than into open space.
Filing has slowed since its 2020 peak
Annual volume ran at 7 in 2017 and reached 9 in 2020 before falling to 1 at the 2022 midpoint. Combined with the 18-month publication lag, this points to a field where the fundamental mechanical architecture is settled and incremental refinement now dominates over new architecture claims.
Secondary branches are thin relative to the core
Beyond the B60R core, seat-interior integration (B60N), force sensing (G01L) and door/window fittings (B60J) each touch under 4% of the 261 records, and buckle hardware, gas-generant chemistry, textile dyeing and distance sensing each sit near or just above 1%. These are the branches where claim density has not caught up with the core mechanics.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to seat belt and occupant restraint systems, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Simula, Inc. | YANIV GERSHON | 4 |
| Key Safety Systems, Inc. | PALLISER MARTYN | 2 |
| Key Safety Systems, Inc. | BELL JOHN | 2 |
| ZF Automotive Germany GmbH | ZF Automotive Systems Poland | 2 |
| TRW Vehicle Safety Systems Inc. | Ford Motor Company | 1 |
| Key Safety Systems, Inc. | HANNAH IAN | 1 |
| Simula, Inc. | ROMEO DAVID J | 1 |
| Simula, Inc. | RICHARDS MARVIN K | 1 |
Only 10 co-assignee pairs appear in the dataset, and the strongest pairing links 4 records — co-filing is the exception rather than the norm in this field, with most records assigned to a single corporate entity.
Who is filing, and where the gaps sit
The ranked leaders span classic restraint-system specialists and vehicle OEMs; recent-year momentum has cooled across the board rather than shifting toward any single filer.
A single leader well ahead of the field
The top-ranked assignee holds 38 records against a fifth-place figure of 11 and a tenth-place figure of 7 — a steep drop-off that marks this as a leader-plus-long-tail structure rather than an evenly distributed field.
Momentum has stalled across the top filers
Every one of the assignees tracked for recent-year momentum — including the leading restraint-system specialists and major OEM patent holders — shows zero filings in the latest year. That is consistent with the broader trend decline rather than any single company pulling back.
Filing is mostly solo, not joint
Co-assignment is rare in this dataset: only 10 pairs are recorded, the strongest linking a research entity with a named inventor across 4 records. Most patents in scope are single-assignee filings, which simplifies freedom-to-operate checks but also means licensing consolidation has been limited.
| Assignee | Recent year | YoY |
|---|---|---|
| Takata Corporation | 0 | — |
| Ford Global Technologies, LLC | 0 | — |
| TRW Vehicle Safety Systems Inc. | 0 | — |
| Autoliv ASP, Inc. | 0 | — |
| Key Safety Systems, Inc. | 0 | — |
| NSK Ltd. | 0 | — |
| Simula, Inc. | 0 | — |
| ZF Automotive Germany GmbH | 0 | — |
Where to take this next
The dataset points to a mature core and a thin set of adjacent branches. Two directions follow from that.
Stress-test a claim against the cited core
The most-cited records in this dataset, several from the 1990s, still anchor restraint-control logic cited by later filings. Before drafting in occupant-sensing or control-zone territory, check freedom to operate against these foundational documents specifically, not just recent filings.
Run a citation check in EurekaScope claims into the thinner branches
Force measurement, textile treatment and distance-sensing overlaps with restraint systems each sit near or just above 1% of records. That is where a well-drafted first claim has more room to stand than in the crowded pretensioner and load-limiter core.
Explore white space in EurekaCommon questions about this landscape
The ranking in this dataset covers 66 assignees, with the top-ranked company holding 38 of the 261 records in scope. The top 5 assignees combined account for 48.3% of all records, and the top 10 reach 64.0%, which marks this as a field with a clear leader followed by a long tail of smaller filers. Restraint-system specialists and vehicle OEMs both appear among the ranked leaders, reflecting how tightly integrated seat belt hardware is with vehicle platform design.
No, filing volume has declined from a peak of 9 in 2020 to 1 at the 2022 midpoint, following 7 filings in 2017. Because publication lags filing by roughly 18 months, the final years in any trend chart are undercounted, but the multi-year decline through the midpoint indicates the field has cooled rather than accelerated. This pattern is typical of a mechanically mature technology where core architecture claims were filed early and later activity is incremental.
Beyond the core B60R classification that covers all 261 records by construction of this search, the next most common overlaps are vehicle seat structure (B60N, 3.8% of records), force and pressure measurement (G01L, 2.3%), and door and window fittings (B60J, 1.9%). Buckle hardware, gas-generant chemistry, textile dyeing and distance or gyroscope sensing each appear in around 1% of records, marking them as narrower adjacent branches rather than core territory.
The classification data shows filing density thinning out sharply once you move away from the B60R core. Force-sensing integration, occupant-size adaptive webbing, gas-generant chemistry for pretensioners, and distance or gyroscope-based occupant sensing each sit at or near 1% of the 261 records, despite touching active engineering problems. These branches carry lower filing density than the crowded pretensioner and load-limiter mechanics, which is where new claims face the least prior art crowding.
With the top 5 assignees holding 48.3% of the 261 records in scope and the top 10 holding 64.0%, this field shows meaningful concentration but not a monopoly — over a third of records sit outside the top 10 filers, spread across a 66-company ranking. Co-assignment is also rare, with only 10 co-assignee pairs recorded and the strongest linking just 4 records, suggesting most companies file independently rather than through joint ventures or shared research programmes.
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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.