Oil Free Compressor Patents: Top Companies & Filing Trends 2026
A data-backed look at oil free compressor patents: who leads filings, how the technology composition breaks down across IPC subclasses, and where the filing white space sits heading into 2026.
Filing growth = 2021 (15 records) → 2024 (21); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 1,234 records in scope (CR5), not the ranked leaders only.
What the oil free compressor patent record actually shows
Oil free compressor design sits at the intersection of rotary-piston and positive-displacement machinery, where eliminating lubricant from the compression chamber forces trade-offs in sealing, cooling and bearing design. The dataset in scope — 1,234 published records filed between 2015 and the 2026 cut-off — spans classical scroll and screw architectures as well as adjacent refrigeration and motor-integration claims. Filing is heavily concentrated at the top of the assignee table, but the long tail of single- and few-filing entrants suggests the core mechanical problem is still being approached from multiple directions.
Because publication lags filing by roughly 18 months, the most recent one to two years in any trend chart will understate true filing activity. The safer read is the three-year window through 2024, which is the latest year the data treats as complete.
Filing trend and technology composition
Two views of the same 1,234-record dataset: how filing volume has moved year over year, and how records distribute across IPC subclasses.
Filing trend, 2017-2026
Filings peaked at 70 in 2017 and have settled into a steadier band since, with 2021 to 2024 showing a 40% increase (15 to 21 records) across the last three-year window the data treats as complete. Years after 2024 are still filling in as publications catch up to filing dates.
Publication lags filing by roughly 18 months, so 2025 onwards are still filling in. Growth rates on this page therefore end at 2024; running them to the last bar would understate the field.
IPC subclass composition
F04C (rotary-piston pumps) touches 59.6% of records and F04B (positive-displacement pumps) 41.8%, together forming the mechanical core of the field. Secondary classes — F04D, F25B, F16J, F01C, F16C and H02K — each sit under 10% of records, marking narrower but still active claim territory around sealing, bearings, motor integration and refrigeration adjacency.
Shares are the percentage of the 1,234 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Compressors & Blowers: Oil Free Compressor Patent Landscape with Eureka
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Try EurekaThe most-cited and most representative filings
Pressure ratio modulation for a two stage oil free compressor assembly
A two-stage oil free compressor assembly includes a pressure modulation mechanism, which enhances the ambient temperature and altitude capability of the compressor. A selected amount of pressurized fluid is drawn from an output side of a second stage compressor portion and reintroduced into the lower pressure interstage circuit of the assembly, thus raising the interstage pressure. The fluid can be further cooled using the interstage heat exchanger, and a valve is adjusted to control the amount of fluid used for pressure modulation.Filed by Sullair, LLC; granted 2003. Still one of the field's most structurally referenced two-stage pressure-modulation claims.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6102665A | Compressor system and method and control for same | 210 |
| 2 | US6471486B1 | Compressor system and method and control for same | 152 |
| 3 | US2178662A | Fluid compressor | 112 |
| 4 | US5772411A | Gas flow and lubrication of a scroll compressor | 93 |
| 5 | US4057371A | Gas turbine driven high speed centrifugal compressor unit | 90 |
| 6 | US6474950B1 | Oil free dry screw compressor including variable speed drive | 88 |
| 7 | US4390322A | Lubrication and sealing of a free floating piston of hydraulically driven gas compressor | 77 |
| 8 | US4487563A | Oil-free rotary displacement compressor | 73 |
| 9 | US4291547A | Screw compressor-expander cryogenic system | 73 |
| 10 | US5364250A | Oil-free screw compressor and method of manufacture | 72 |
Citation counts favour older records simply by virtue of being searchable longer; treat them as a signal of influence on later filings, not as a measure of current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once the assignee, trend and classification data are read together.
Filing is concentrated but not closed
The top 5 assignees combined hold 37.0% of all 1,234 records in scope, and the top 10 hold 47.6%. That leaves more than half the field split across a long tail of entrants — room to file around specific mechanical implementations even where the leader's volume looks daunting.
Activity is rising, not cooling
Filing volume rose from 15 records in 2021 to 21 in 2024, a 40% increase across the last three-year window the data treats as complete. That contradicts any read of the raw year-by-year chart that treats the tail-off after 2024 as a real decline; it is a publication-lag artefact.
The mechanical core is rotary-piston, not scroll or screw alone
F04C and F04B together cover the bulk of claim activity, but no secondary class — F04D, F25B, F16J, F01C, F16C or H02K — exceeds 10% of records. That gap between the core and the secondary classes is where narrower, less contested claim space tends to sit.
Filing is US- and EPO-led with strong Asian volume
The United States leads with 300 records, ahead of Europe at 186 and Japan at 144. South Korea, India and WIPO PCT filings each add meaningful volume, pointing to a genuinely multi-jurisdiction competitive field rather than one concentrated in a single market.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to compressors & blowers: oil free compressor patent landscape, with the prior art for and against each one.
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, competitive tracking or identifying open claim space.
Map claim language against the leader's portfolio
With one assignee holding 259 of 1,234 records, a claim-by-claim comparison against that portfolio is the fastest way to spot where a new filing would actually differ mechanically rather than just administratively.
Explore assignee claims in EurekaWatch the secondary classes for emerging combinations
F16J, F01C, F16C and H02K each sit under 10% of records but represent sealing, bearing and motor-integration claims that could compound with the core F04C/F04B mechanics as electrification pushes into compressor design.
Track secondary-class filings in EurekaValidate freedom-to-operate before committing engineering time
The most-cited records in this field include claims dating back decades; running a structured citation and claim-scope check against those before finalising a design avoids late-stage rework.
Run a freedom-to-operate check in EurekaCommon questions about oil free compressor patents
One assignee leads the field with 259 of the 1,234 records in scope, more than double the fifth-placed filer at 35 records. The top 5 assignees combined hold 37.0% of all records, and the top 10 hold 47.6%, so while filing is concentrated at the top, more than half the field is spread across a long tail of smaller filers. Anyone assessing competitive position should look at both the leader's volume and the breadth of that tail before assuming the space is closed.
Filing rose 40% from 15 records in 2021 to 21 in 2024, the last three-year window the data treats as complete. The raw year-by-year chart appears to drop off after 2024, but that reflects publication lag rather than a real slowdown, since patent publication typically trails filing by around 18 months. The honest read is that activity has been increasing through the most recent complete year, not cooling.
F04C, rotary-piston pumps, touches 59.6% of the 1,234 records in scope, and F04B, positive-displacement pumps, touches 41.8%. Every other subclass tracked — F04D, F25B, F16J, F01C, F16C and H02K — sits under 10% of records, covering narrower territory like sealing, bearings, motor integration and refrigeration adjacency. A record can carry more than one class, which is why these figures add to more than 100%.
The secondary IPC classes — F16J (seals and gaskets), F01C (rotary-piston machines), F16C (bearings and couplings) and H02K (electric motors and generators) — each cover under 10% of the 1,234 records, well below the core F04C and F04B mechanics. That gap suggests claim space around sealing solutions, bearing arrangements and motor-integration approaches specific to oil free operation is less crowded than the core compression mechanism itself, though it should be checked against the leader's existing portfolio before committing to a specific implementation.
The United States receiving office leads with 300 of the tracked records, followed by Europe (EPO) at 186 and Japan at 144. South Korea (88), India (68) and WIPO PCT filings (60) add substantial additional volume, indicating the field is contested across several major markets rather than concentrated in one. A freedom-to-operate review for a new product should account for filings in whichever of these jurisdictions the product will be manufactured or sold.
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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.