Pneumatic Ducting Patents: Who Leads, Where the Gaps Are 2026
Pneumatic ducting and high-temperature joint patents: mapping the leaders and the open claim space
Filing peaked in 2018 at 20 records and the tracked growth window (2021 to 2024) shows a full -100% decline, though 2025-2026 figures are still filling in as publication lags filing. Annual counts climbed from 7 in 2017 to a peak of 20 in 2018. The tracked growth span from 2021 to 2024 shows a -100% change, but 2025 and 2026 are not yet complete windows — publication typically lags filing by around 18 months, so recent-year counts will keep rising as more records surface.
- 1UNISON INDUSTRIES LLC41
- 2GENERAL ELECTRIC CO17
- 3ROLLS ROYCE NORTH AMERICAN TECHNOLOGIES INC14
- 4THE GARRETT CORP8
- 5THE BOEING CO7
See the full pneumatic ducting and high temperature joints analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on pneumatic ducting and joint patents
Who holds the most patents on pneumatic duct and bellows expansion joint technology?
In this 99-record dataset, one assignee leads the ranked list of 16 companies with 41 families, well ahead of the fifth-ranked company at 7 and the tenth at 1. That leader’s filings cluster heavily in gas-turbine (F02C) and pipe-fitting (F16L) classifications, which together cover the majority of records in scope. The gap between first and fifth place is wide enough that the leader’s portfolio effectively sets the boundaries most other filers design around.
Is patent filing in this space growing or shrinking?
Filing activity peaked at 20 records in 2018 after rising from 7 in 2017, and the tracked 2021-to-2024 growth window shows a full -100% change. That looks like a decline, but publication lags filing by roughly 18 months, so 2025 and 2026 counts are still incomplete and should not be read as confirmation of a continuing drop. The safest read is that the field’s core hardware claims were staked out earlier in the window, with recent activity not yet fully visible in published data.
What is a bellows expansion joint used for in aerospace ducting?
A bellows expansion joint is a flexible section built into pneumatic or bleed-air ducting that absorbs thermal growth, vibration and misalignment between rigid duct sections without leaking under pressure. One of the most-cited records in this dataset, a bellows expansion joint patent, has drawn 54 citations, indicating it is a frequently referenced baseline design. Related hardware in this landscape includes sliding expansion joints and clamp couplings, which serve similar thermal-accommodation functions with different mechanical arrangements.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Pneumatic Ducting and High Temperature Joints covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.