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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/engine-nacelle-and-inlet-design-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Aerospace PropulsionEngine Nacelle and Inlet Design Patents: Concentration, Trend and Where the Claims Thin Out
- 78.1% concentration. The top five assignees hold 211 of the 270 records in scope, leaving a long tail of single- and few-filing entrants.
- Filing has cooled from its 2017 peak. 25 records published that year against 21 in 2021 and 7 in 2024, a -67% span the leader group's own filings mirror, with several major assignees showing zero activity in the latest tracked year.
- B64D dominates, but E05B and B29C are thin. Aircraft-equipment claims cover 59.3% of records while cowl-latch (E05B, 9.3%) and composite-shaping (B29C, 6.7%) classes stay comparatively open.
270
Published Records
78%
Top-5 Share of All Records
-67%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (21 records) with 2024 (7) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 270 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Field Overview
What this landscape covers
This dataset tracks patent families and published applications at the intersection of engine nacelle structure and inlet design — inlet lip skins, drooped inlets, inlet barrel geometry, cowl latches and spinner anti-icing among them. The search combines nacelle and fan-cowl terms with the specific mechanical and thermal problems those structures solve, rather than pulling in every aircraft-propulsion filing that happens to mention a nacelle.
270 records fall in scope between 2015 and the 2026-07-31 cut-off. Publication lags filing by roughly 18 months, so the most recent one to two years in any trend understate actual filing activity rather than reflect a real slowdown.
Records in scope by filing year
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Engine Nacelle and Inlet Design covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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Filing Data
Trend, technology mix and filing geography
The filing curve, IPC composition and receiving-office spread together show where nacelle and inlet claims have concentrated and where the field has already moved on from its earlier peak.
A peak in 2017, a cooling since
Filings peaked at 25 in 2017. By 2021 they had settled to 21, and by 2024 — the most recent year that can be read as complete once publication lag is accounted for — to 7, a -67% span. Years after 2024 will fill in as later publications land and should not yet be read as a further drop.
Aircraft equipment carries the field
B64D (aircraft equipment) appears on 59.3% of the 270 records in scope, well ahead of F02C gas-turbine plant claims at 34.8%. Locks-and-keys claims tied to cowl latching (E05B, 9.3%) and plastics-shaping claims tied to composite cowls (B29C, 6.7%) sit far lower, marking narrower but less crowded claim territory.
Shares are the percentage of the 270 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Engine Nacelle and Inlet Design covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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The most-cited records anchor the field
Representative Filing
US20050006529A1 — noise abatement and ice protection of an aircraft engine nacelle inlet lip
ROHR INC.
An aircraft engine nacelle comprises an inlet lip and skin with internal and external surfaces, a noise abatement structure such as an acoustic panel on the internal surface, and an electrically powered de-icing system on the external surface connected to a power source. The method applies electric current to the de-icing system while the acoustic panel abates noise from the same nacelle skin structure.Filed by Rohr Inc., this family sits behind three of the field's most-cited records and defines the combined noise-abatement-plus-de-icing architecture that later inlet-lip filings had to design around.
Highest-cited records in scope
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | EP1495963A2 | Method and apparatus for noise abatement and ice protection of an aircraft engine nacelle inlet lip | 141 |
| 2 | US20050006529A1 | Method and apparatus for noise abatement and ice protection of an aircraft engine nacelle inlet lip | 116 |
| 3 | US5529263A | Supersonic airplane with subsonic boost engine means and method of operating the same | 105 |
| 4 | US3666211A | Trijet aircraft | 93 |
| 5 | US7588212B2 | Method and apparatus for noise abatement and ice protection of an aircraft engine nacelle inlet lip | 79 |
| 6 | US5915403A | Biplanar scarfed nacelle inlet | 79 |
| 7 | US5581054A | One-piece engine inlet acoustic barrel | 75 |
| 8 | GB2273131A | Engine inlet acoustic barrel | 71 |
| 9 | US20090173823A1 | Method and component for determining load on a latch assembly | 62 |
| 10 | US6027078A | Method and apparatus using localized heating for laminar flow | 61 |
Citation counts reward older filings that have had longer to accumulate references within this corpus — read them as a measure of influence on later filers, not as a signal of current commercial weight.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Engine Nacelle and Inlet Design covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers say about the field
Three patterns stand out once the ranking, the trend and the IPC mix are read together: heavy concentration among a handful of aerospace primes, a filing curve that has already passed its peak, and technology classes that carry very different claim density.
Concentration
78.1%
of 270 records held by top 5 assignees
A small leader group, then a long tail
The top five assignees account for 211 of the 270 records in scope, and the top ten for 246, or 91.1%. The leader alone holds 117 records against 9 for the fifth-place assignee, so the drop-off inside the leader group itself is steep before the long tail of single-filing entrants even begins.
Ranking covers 29 companies in total
Filing Trend
-67%
2021 → 2024
Past its peak, not yet at a floor
Filings peaked at 25 in 2017 and had fallen to 7 by 2024, a -67% span over three years. Several of the largest historical filers show zero output in the latest tracked year, though later publications will still land as the 18-month lag clears.
2026 figures are partial by design
Technology Mix
59.3%
of records carry B64D
Aircraft equipment claims dominate
B64D aircraft-equipment claims sit on well over half of all records, with F02C gas-turbine plant claims a distant second at 34.8%. Cowl-latch mechanisms (E05B) and composite cowl shaping (B29C) are present on under 10% each, marking the thinner ends of the claim space.
Shares sum to over 100% because records carry multiple IPC classes
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Co-filing is rare and narrow
| Assignee | Co-assignee | Shared families |
|---|---|---|
| The Boeing Company | Georgia Tech Research Corporation | 5 |
| General Electric Company | General Electric Company Polska | 2 |
| MRA Systems, LLC | VELTEN JAMES J | 2 |
| MRA Systems, LLC | MAHESHWARI MAHENDRA | 2 |
| Rohr, Inc. | SHETZER DANIEL JEREMY | 1 |
| Rosemount Aerospace Inc. | LIN CHUANG CHIA | 1 |
| Rosemount Aerospace Inc. | GRICHENER ALEXANDER | 1 |
Only 7 co-assignee pairs appear across the dataset, the strongest linking Boeing with Georgia Tech Research Corporation at 5 shared records — a sign that most nacelle and inlet IP here is filed solo rather than through joint development structures.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Engine Nacelle and Inlet Design covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Assignee Landscape
Who holds the claim space
The ranked leaders are dominated by airframe and nacelle-systems primes, with the leader holding more records than the next four combined. Momentum has cooled across nearly all of them in the most recent tracked year, which is as much a publication-lag artefact as a sign of retreat.
Leader
117
records
One assignee sets the pace by a wide margin
The leading assignee's 117 records is more than ten times the tenth-place count of 6, reflecting decades of nacelle and inlet-lip system work concentrated in one filer's portfolio.
Boeing appears among the ranked leaders
Momentum
-100%
YoY for several top filers
Latest-year activity has gone quiet across the leader group
Several of the largest historical assignees, including Boeing, Rohr and General Electric, show zero records and a -100% year-over-year change in the latest tracked year. That reads more as publication lag catching up than as an exit from the space.
Read alongside the 18-month publication lag
Co-filing
7 pairs
co-assignee links total
Joint filings are the exception, not the rule
The strongest co-assignee link pairs Boeing with Georgia Tech Research Corporation across 5 records; most other pairs, including General Electric with its Poland unit, and MRA Systems with an individual inventor, sit at 2 shared records.
Most portfolios here are filed by a single assignee
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| The Boeing Company | 0 | -100% |
| Rohr, Inc. | 0 | -100% |
| United Technologies Corporation | 0 | — |
| Rosemount Aerospace Inc. | 0 | — |
| General Electric Company | 0 | -100% |
| MRA Systems, LLC | 0 | — |
| Short Brothers PLC | 0 | — |
| Rolls-Royce plc | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Engine Nacelle and Inlet Design covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Next Steps
Where to take this landscape next
The ranking and trend data point to a field with a settled leader group and cooling aggregate filing, but the thinner IPC branches and the citation network both deserve closer reading before committing R&D or freedom-to-operate budget.
Map claim scope inside the thin IPC classes
E05B cowl-latch and B29C composite-shaping claims sit far below the density of B64D and F02C. A claim-by-claim read of just those subsets will show whether the low share reflects genuine white space or simply fewer applicable filings.
Explore the IPC breakdown in EurekaTrace the citation network around the inlet-lip de-icing family
The three most-cited records in this dataset all trace to the same noise-abatement-and-ice-protection inlet-lip architecture. Understanding what later filers had to design around it clarifies where genuinely novel claim room still exists.
Trace citations in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Engine Nacelle and Inlet Design covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Frequently Asked
Questions practitioners ask about this landscape
One assignee leads the ranked group with 117 of the 270 records in scope, well ahead of the fifth-place assignee at 9 and the tenth-place assignee at 6. The top five assignees combined hold 211 records, or 78.1% of everything in scope, and the top ten hold 246, or 91.1%. That leaves a long tail of smaller filers spread across the remaining 29 ranked companies, most holding only a handful of records each.
Filings peaked at 25 records in 2017 and had fallen to 7 by 2024, a -67% change over that three-year span. Because publication lags filing by roughly 18 months, the years closest to the 2026 cut-off will still fill in and should not be read as evidence of a further decline. Several of the largest historical assignees show no published output in the most recent tracked year, which is consistent with lag rather than a confirmed exit from the field.
US20050006529A1, assigned to Rohr Inc., covers an aircraft engine nacelle that combines a noise-abatement structure such as an acoustic panel on the internal skin surface with an electrically powered de-icing system on the external skin surface. It is one of the most-cited records in this dataset, with a related family member cited 141 times, because it defines a combined noise-and-ice-protection architecture that many later inlet-lip filings needed to reference or design around. Anyone filing new inlet-lip claims that pair acoustic treatment with de-icing on the same skin structure should read this family closely before drafting.
Cowl-latch mechanisms (E05B) and composite inlet-barrel or cowl shaping (B29C) each appear on under 10% of the 270 records in scope, well below the 59.3% carried by general aircraft-equipment claims and 34.8% by gas-turbine plant claims. Drooped inlet lip geometry and spinner anti-icing integration also sit outside the densest claim clusters. Lower density in these classes does not guarantee an easy filing, but it does mean fewer competing claims to design around compared with the core inlet-lip and acoustic-panel space.
Rarely. The dataset shows only 7 co-assignee pairs across all 270 records, and the strongest of those links Boeing with Georgia Tech Research Corporation across just 5 shared records. Most other pairs, such as General Electric with its Poland-based unit, sit at 2 shared records. The overwhelming majority of portfolios in this landscape are filed by a single assignee rather than through joint development arrangements.
Answers are grounded in the same dataset. Derived from a Patsnap search on Engine Nacelle and Inlet Design covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.