Roots & Positive Displacement Blower Patents: Leaders, Trends 2026
- 260 of 731 records sit with the five most active assignees — 35.6% of the field concentrated at the top, with a long tail below.
- Filing fell 69% from 16 records in 2021 to 5 in 2024, the last year the dataset treats as complete.
- F04C and F02B together anchor the field, each present on roughly a third of all 731 records, while pulsation- and silencer-specific claims stay comparatively thin.
Filing growth compares 2021 (16 records) with 2024 (5) — 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 731 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks 731 published records at the intersection of roots, positive displacement and rotary lobe blower hardware and the specific engineering problems that make or break them in service: timing gear synchronisation, pulsation attenuation, internal compression, tip clearance leakage, silencer chamber design and temperature rise. It is a mechanical-systems field rather than a materials one — the claims are about rotor geometry, casing structure and control logic, not chemistry.
Coverage runs from 2015 through the 2026-07-31 cut-off. Because publication typically lags filing by around eighteen months, the most recent one to two years in any trend understate actual filing activity and should not be read as a slowdown on their own.
Filing trend and technology composition
Two views of the same 731 records: how filing activity has moved year over year, and which IPC subclasses carry the claims.
A peak in 2019, then a documented decline
Filings rose to a peak of 26 records in 2019, then fell; the dataset records a drop from 16 in 2021 to 5 in 2024, a 69% decline over that three-year span. Treat 2025 and 2026 figures as incomplete rather than as evidence the decline is continuing.
Rotary-piston and engine subclasses dominate
F04C (rotary-piston pumps) and F02B (internal-combustion engines) each appear on close to a third of all 731 records, reflecting how tightly roots-blower claims are tied to engine-boost applications. Separation processes (B01D), non-positive-displacement pumps (F04D) and fuel supply (F02M) each sit in the 5-8% range — present, but not where most of the claim density lives.
Shares are the percentage of the 731 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Roots and Positive Displacement Blowers with Eureka
This page is one run against one query. Ask Eureka your own question about roots and positive displacement blowers and every answer comes back with the patent numbers behind it.
Try EurekaA representative filing and the most-cited prior art
US20110300014A1 — Rotary lobe blower with a shunt pulsation trap
A shunt pulsation trap for a rotary lobe blower or vacuum pump reduces pulsation and NVH and improves efficiency without increasing the overall size of the unit. A pair of interconnected, synchronised parallel multi-lobe rotors sits in a transfer chamber, propelling flow from suction to discharge without internal compression. The trap itself comprises an inner casing integral to the transfer chamber and an oversized outer casing surrounding it, housing pulsation-dampening structure.Filed by Hi-Bar Blowers, Inc., published 2011-12-08.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7188621B2 | Portable ventilator system | 348 |
| 2 | US9254535B2 | Apparatuses, systems and methods for three-dimensional printing | 268 |
| 3 | US20150367415A1 | Apparatuses, systems and methods for three-dimensional printing | 249 |
| 4 | US20080053438A1 | Portable ventilator system | 218 |
| 5 | US9346127B2 | Apparatuses, systems and methods for three-dimensional printing | 197 |
| 6 | US9573193B2 | Apparatuses, systems and methods for three-dimensional printing | 180 |
| 7 | US9403235B2 | Apparatuses, systems and methods for three-dimensional printing | 179 |
| 8 | US9586290B2 | Systems for three-dimensional printing | 175 |
| 9 | US9573225B2 | Apparatuses, systems and methods for three-dimensional printing | 174 |
| 10 | US9399256B2 | Apparatuses, systems and methods for three-dimensional printing | 169 |
Citation counts inside this searched corpus favour older records and are a signal of influence, not of current commercial relevance; several of the highest-cited entries here are ventilator and 3D-printing filings that cite blower mechanics as a component, not blower patents in their own right.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-throughs from the concentration, technology mix and citation data — useful for deciding where a new filing has room and where it is walking into dense prior art.
The top of the field is consolidated, the rest is fragmented
Five assignees combined hold 260 of the 731 records in scope, and the top ten extend that to 353 records, 48.3% of the field. Below that the ranking runs to 100 companies with a long tail of single- and few-filing entrants, which is the usual shape when a mechanical niche has a few established suppliers and many application-specific one-off filings.
Activity has cooled from its 2019 peak
Filings peaked at 26 in 2019 and fell from 16 in 2021 to 5 in 2024 — a documented 69% decline over that span, the last three years the dataset treats as complete. That is consistent with a mature mechanical category where core geometry and pulsation-control approaches are largely settled, rather than a sign the underlying market has shrunk.
Rotary-piston and engine-boost claims dominate over pulsation-specific ones
F04C and F02B each sit near a third of all records, showing how strongly this corpus is tied to boost and pump mechanics rather than standalone acoustic or thermal management. Silencer-chamber and temperature-rise language shows up as search terms but does not surface as its own dense IPC cluster here, which is where a narrower filing has more room to stand out.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to roots and positive displacement blowers, with the prior art for and against each one.
Who is active, and where the gaps sit
The ranked leaders combine established industrial suppliers with automotive OEMs and a handful of unrelated entrants whose filings happen to intersect this search string; momentum has gone flat across the group in the most recent tracked year.
One assignee sits well ahead of the field
The leading assignee holds 100 records against a fifth-place figure of 22 and a tenth-place figure of 15 — a steep drop-off that marks this as a leader-and-long-tail field rather than a tightly clustered one.
Recent-year activity has gone quiet at the top
Several of the most active historical filers show zero records in the latest tracked year, including one with a reported -100% year-on-year change. Given the roughly 18-month publication lag, this reads as pipeline still filling rather than firms exiting the space outright.
Co-filing is rare and concentrated in a couple of relationships
Only ten co-assignee pairs appear in the dataset, and the strongest pairing recurs at 18 shared records — most filings in this field are made by a single assignee rather than through joint development arrangements.
| Assignee | Recent year | YoY |
|---|---|---|
| Eaton Corp | 0 | — |
| VELO3D Inc | 0 | — |
| Eaton Intelligent Power Limited | 0 | -100% |
| Volvo Truck Corporation | 0 | — |
| CROSS PAUL C | 0 | — |
| Georgia Tech Research Corporation | 0 | — |
| CAREFUSION 203 INC | 0 | — |
| Anlet Co., Ltd. | 0 | — |
Where to take this from here
The dataset points to a mature core and a thinner set of adjacent claim areas — the next step is testing a specific claim against both.
Check freedom to operate against the leader's portfolio
With one assignee holding 100 of the 731 records, any new filing in rotor geometry or transfer-chamber design should be checked against that portfolio specifically, not just the field average.
Run a freedom-to-operate check in EurekaTest a claim inside the under-claimed branches
Silencer-chamber acoustics, tip-clearance leakage compensation and timing-gear synchronisation control all sit inside scope but below the dominant F04C/F02B density, and are worth drafting against directly.
Explore white space in EurekaTrack the next 12-18 months of filings as they publish
Because 2025-2026 filings are still lagging into publication, re-pull the trend in six months before concluding the 2021-2024 decline has continued.
Set up trend monitoring in EurekaCommon questions about this landscape
The ranking covers 100 assignees, with the leader holding 100 records against 22 at fifth place and 15 at tenth. The top five combined account for 260 of the 731 records in scope, or 35.6% of the field, and the top ten extend that to 353 records, 48.3%. Below the leaders the field fragments quickly into a long tail of companies with only a handful of filings each, so competitive risk is concentrated at the top rather than spread evenly.
Filings peaked at 26 records in 2019 and have declined since, with the dataset showing a drop from 16 records in 2021 to 5 in 2024 — a 69% fall over that three-year span, which is the most recent period the dataset treats as complete. Figures for 2025 and 2026 are still understated because publication typically lags actual filing by around 18 months, so it is premature to call the trend still falling based on those years alone. The pattern is more consistent with a mechanically mature category than a shrinking market.
F04C (rotary-piston pumps) and F02B (internal-combustion engines) are the two dominant classes, each present on close to a third of the 731 records in scope, reflecting the tie between blower mechanics and engine-boost applications. F01C, F02D, B01D, F04D and F02M each appear on a smaller share, roughly 5-10% of records. Because a single record can carry several IPC codes, these shares add up to more than 100% and should not be read as mutually exclusive segments.
US20110300014A1, filed by Hi-Bar Blowers, claims a shunt pulsation trap built from an inner casing integral to the transfer chamber and an oversized outer casing housing pulsation-dampening structure, applied to a rotary lobe blower or vacuum pump without internal compression. It targets pulsation and NVH reduction without increasing the physical footprint of the unit. Anyone designing a pulsation-attenuation feature around a similarly sized dual-casing arrangement on a non-compressing lobe blower should read this filing closely; designs that use internal compression, a different casing topology, or attenuation methods outside the shunt-trap structure sit outside its literal scope.
The technology composition data shows dense claim coverage in rotary-piston mechanics and engine-boost integration (F04C, F02B) but comparatively thin coverage in silencer-chamber acoustic tuning, tip-clearance leakage compensation, and timing-gear synchronisation control, even though all three sit inside the search scope. These are areas where the underlying engineering problem is well documented but the IPC presence is not dominant, which typically means less prior art density to design around. A first claim there would do best to tie a specific structural mechanism to one of these narrower problems rather than to the blower as a whole.
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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.