Shell-and-Tube Heat Exchanger Patents: Leaders & Filing Trends 2026
- Filing peaked in 2017 at 21 families and has declined since, with the 2022 midpoint down to just 2 — this is a mature claim space, not a growing one.
- F28F and F28D dominate at 198 and 186 records respectively out of 247, meaning heat-exchanger detail and apparatus claims overlap on most filings rather than sitting in separate silos.
- The US receives the most filings (52) ahead of Europe (30), the UK (29), India (20) and WIPO PCT (19) — a filing footprint concentrated in a handful of jurisdictions.
A narrow, long-running claim space
Shell-and-tube heat exchanger design has been patented steadily since at least the 1960s, and the 247 families captured here (2015 data cut) sit on top of decades of prior art in baffle geometry, fouling mitigation and tube-vibration control. Filing activity peaked in 2017 and has since fallen off, with the 2022 midpoint recording only 2 families — a pattern consistent with a field where the core mechanical configurations are already well described and later filers are working narrower variations rather than staking out new ground.
The IPC composition confirms this: F28F (heat-exchanger details) and F28D (heat-exchange apparatus) between them touch nearly all 247 records, so most inventive activity is happening inside baffle, tube-bundle and surface-treatment detail rather than in adjacent process integration. Smaller pockets in F22B, B01J and F28G point to where the technology crosses into steam generation, catalytic process equipment and cleaning — areas with far thinner coverage.
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Filing trend and technology composition
Publication counts understate the most recent one to two years because filings take roughly 18 months to publish; treat the tail of the trend line as a floor, not a ceiling.
A field past its filing peak
From a 2017 high of 21 families, annual filings dropped sharply and have stayed low through the 2022 midpoint (2 families) to the most recent partial year (1). This is not a technology accelerating toward a breakthrough; it is one where the active design space has narrowed.
Claim density sits in two overlapping subclasses
F28F (198 records) and F28D (186 records) account for the bulk of filings and overlap heavily, meaning most patents combine apparatus-level and detail-level claims. F22B (15), B01J (10), F28G (9), C01C (8), B01D (6) and B21C (6) mark thinner, more specialised adjacent branches.
Shares are the percentage of the 247 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Shell-and-Tube Heat Exchanger Design with Eureka
This page is one run against one query. Ask Eureka your own question about shell-and-tube heat exchanger design and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art doing the most citing work
CA2186557A1 — Double-segmental shell and tube heat exchanger (Monsanto, 1997-03-30)
The patent describes a double-segmental baffle geometry in which tubes do not pass through the baffle windows, so shellside fluid flow avoids the tube obstructions that create non-ideal flow. Removing tubes from the flow passageways raises the shellside heat transfer coefficient and cuts the required heat transfer surface area, with the design aimed specifically at acid coolers used in contact sulfuric acid service.Abstract reproduced from the published filing.
View full record| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20080073063A1 | Reduction of fouling in heat exchangers | 91 |
| 2 | US3400758A | Helical baffle means in a tubular heat exchanger | 89 |
| 3 | US5203405A | Two pass shell and tube heat exchanger with return annular distributor | 80 |
| 4 | US4493368A | Helical flow heat exchanger having individually adjustable baffles | 70 |
| 5 | US5309987A | Method and apparatus for heating and cooling food products during processing | 69 |
| 6 | US4253516A | Modular heat exchanger | 61 |
| 7 | US4699211A | Segmental baffle high performance shell and tube heat exchanger | 46 |
| 8 | US3958630A | Heat exchanger baffle arrangement | 44 |
| 9 | WO2009148822A2 | Vertical combined feed/effluent heat exchanger with variable baffle angle | 42 |
| 10 | CN2655156Y | 一种螺旋折流板管壳式换热器 | 42 |
Citation counts inside a searched corpus favour older filings; read these as markers of foundational influence, not as current state of the art.
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 patterns stand out once families, IPC coverage and citation data are read together.
The design space is contracting, not expanding
Annual filings fell from a 2017 peak of 21 to a midpoint of 2 in 2022 and 1 in the latest partial year. New entrants are more likely to be defending narrow variants than opening new mechanical territory.
Detail and apparatus claims are rarely separated
With F28F and F28D each touching the large majority of the 247 families, most filers claim baffle or surface detail together with the overall heat-exchanger apparatus, which narrows room for a detail-only claim to stand alone.
Filing is concentrated in a small set of offices
The United States, Europe and the United Kingdom together account for the bulk of receiving-office activity, with India (20) and WIPO PCT (19) trailing — a footprint that rewards freedom-to-operate checks in a handful of jurisdictions rather than a global sweep.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to shell-and-tube heat exchanger design, with the prior art for and against each one.
Assignee activity has gone quiet across the board
Momentum data shows zero filings in the latest year across every assignee tracked here, including established engineering and process-technology names — consistent with the overall decline in annual filing counts rather than any single firm exiting the space.
Named-inventor co-assignment clusters around one engineering firm
The strongest co-assignee pairs in the dataset all involve ExxonMobil Research and Engineering paired with individual named inventors, each appearing three times — a pattern typical of an internal engineering team filing jointly rather than cross-company collaboration.
No assignee shows current-year momentum
Lummus Technology, ExxonMobil Research and Engineering, Phillips Petroleum, Hamilton Sundstrand, Norsk Hydro and Baltimore Aircoil all show zero filings in the most recent year tracked, reinforcing the broader slowdown visible in the trend data.
Foundational patents still anchor the field
The most-cited records address fouling reduction and helical or two-pass baffle configurations, and remain reference points for later filings even though their own assignees are no longer active filers.
| Assignee | Recent year | YoY |
|---|---|---|
| Lummus Technology | 0 | — |
| ExxonMobil Research and Engineering Company | 0 | — |
| Phillips Petroleum Company | 0 | — |
| Hamilton Sundstrand Corporation | 0 | — |
| Norsk Hydro | 0 | — |
| Baltimore Aircoil Company | 0 | — |
| Kellogg Brown & Root LLC | 0 | — |
| BAE Systems plc | 0 | -100% |
Where to take this analysis
The dataset points to a mature, narrowing field with specific thin spots rather than open territory — the next steps are about targeted checks, not broad exploration.
Run a freedom-to-operate check on baffle geometry
Given how heavily F28F and F28D overlap, any new baffle or tube-bundle claim should be checked against both subclasses together, not filtered separately.
Explore prior art in EurekaInvestigate the thin adjacent branches
F22B, B01J, F28G, C01C, B01D and B21C each carry under ten records — worth a closer look if your design touches steam generation, catalytic equipment or cleaning integration.
Map white space in EurekaTrack dormant assignees for reactivation
Zero latest-year filings across every tracked assignee does not mean the portfolios are abandoned; monitor for renewed activity or portfolio transfers.
Set up assignee monitoring in EurekaCommon questions about shell-and-tube heat exchanger patents
The data shows filings peaking at 21 families in 2017 and falling to a midpoint of just 2 by 2022, with only 1 in the latest partial year. This pattern is typical of a mechanically mature technology: the core baffle geometries, tube-bundle layouts and fouling-mitigation approaches were established decades ago, and most later filings narrow existing designs rather than introduce new mechanical configurations. Readers should also account for publication lag of roughly 18 months, which means the very latest year understates true filing activity, but even correcting for that the multi-year decline from the 2017 peak is real.
F28F covers heat-exchanger details such as baffle plates, tube surface treatments and fin configurations, while F28D covers heat-exchange apparatus at the system level. In this dataset the two overlap heavily — 198 records touch F28F and 186 touch F28D out of 247 total families — meaning most patents claim both a specific detail and the apparatus it sits in in the same filing. A freedom-to-operate search limited to just one subclass will miss a large share of the relevant prior art.
The United States leads with 52 filings in this corpus, followed by the European Patent Office (30), the United Kingdom (29), India (20) and the WIPO PCT route (19), with Canada at 16. This concentration means a practical clearance search can prioritise a small number of offices rather than a global sweep, though PCT filings should be checked for later national-phase entries beyond the offices listed.
CA2186557A1, assigned to Monsanto and dated 1997-03-30, claims a double-segmental baffle geometry where tubes do not pass through the baffle windows, improving shellside heat transfer for applications like acid coolers in contact sulfuric acid service. As a 1997 filing its original term has likely expired, so it functions today as prior art rather than an active barrier — but it remains a useful reference point for understanding how double-segmental baffle claims have historically been drafted, which matters when assessing novelty of a new baffle variant.
Yes, though it is narrow. The core F28F and F28D claim territory is dense, but adjacent subclasses like F28G (cleaning heat-exchange surfaces, 9 records), C01C (nitrogen compound processes, 8 records) and B21C (metal extrusion and drawing, 6 records) show far thinner coverage. A design that integrates automated fouling-factor sensing, or that combines tube-bundle geometry with cleaning-surface treatment specifically, sits closer to open territory than another general baffle configuration claim.
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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.