Reciprocating Compressor Bearing Patents: Leaders & White Space 2026
- Filing activity has flattened, not grown. peak year was 2019 at 15 filings, and the 2022 midpoint of 11 sits below that peak — this is a mature, occupied claim space rather than an emerging one.
- Rotary-piston mechanics dominate the IPC mix. F04C and F01C together account for 75 of 109 records, far ahead of dedicated bearing classification F16C at just 15 — most filings treat bearing and tribology work as a subsystem of the compressor claim, not a standalone one.
- No assignee shows momentum in the latest year. every tracked assignee in the recent-momentum data logged zero filings in the most recent year, consistent with publication lag but also with a field where no single player is currently pressing an advantage.
What this landscape covers
This landscape tracks 109 patent families published between 2015 and mid-2026 that combine reciprocating or piston compressor claims with bearing design, piston-ring tribology, or wear-reduction language. The corpus spans classic reciprocating machinery (F04B, F01B) alongside the much larger rotary-piston classifications (F04C, F01C), reflecting how many bearing and wear innovations in this space are filed as part of a broader compressor mechanism rather than as isolated tribology claims.
Filing offices skew toward Europe and the United States, with the EPO, USPTO, Canada and WIPO/PCT together accounting for most of the receiving-office activity. Publication typically lags filing by around 18 months, so the apparent decline in the most recent year should be read with that lag in mind rather than as a confirmed drop-off.
Let an AI agent run this analysis on your own technology
Pick a task. Every answer cites the patents behind it.
Filing trend and technology composition
Annual filings and IPC distribution across the 109 tracked families, drawn directly from the underlying dataset.
A flat-to-declining filing curve
Filings rose to a peak of 15 in 2019, held near that level through the 2022 midpoint of 11, then trail off toward the partial, lag-affected final year. There is no sustained growth phase in this window — activity has oscillated around a plateau rather than compounding.
Rotary-piston classes carry the volume
F04C (39) and F01C (36) lead the composition, with F04B (29) close behind. Refrigeration-adjacent F25B (16) and the dedicated bearing/shaft class F16C (15) trail well behind, and reciprocating-specific F01B (3) and engine-cylinder F02F (4) are thin — most of the claim density sits in compressor mechanism classes, not in bearing or engine-specific ones.
Shares are the percentage of the 109 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Reciprocating Compressor Bearing and Tribology with Eureka
This page is one run against one query. Ask Eureka your own question about reciprocating compressor bearing and tribology and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative filing
Connecting rod of reciprocating compressor (US20140345418A1, WHIRLPOOL S.A.)
The present invention relates to a connecting rod for reciprocating compressor, in particular a connecting rod converting the crank rotating motion into linear axial motion. The rod has means capable of compensating efforts and ensuring alignment and deflection of the piston inside the cylinder. Such means comprise at least two regions capable of oriented resilient deformation, formed in the body and oriented in opposite directions.Filed 2014-11-27 — illustrates how motion-compensation geometry inside the connecting rod body is claimed as an alternative to separate bearing hardware.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20100212311A1 | Thermoacoustic driven compressor | 89 |
| 2 | US6336797B1 | Oiless rotary scroll air compressor air inlet valve | 58 |
| 3 | US20210285693A1 | Lubricant management for an hvacr system | 35 |
| 4 | US20200338639A1 | Advanced Automated Fabrication System And Methods For Thermal And Mechanical Components Utilizing Quadratic O… | 35 |
| 5 | US6283737B1 | Oiless rotary scroll air compressor antirotation assembly | 26 |
| 6 | WO2019099928A2 | Advanced automated fabrication system and methods for thermal and mechanical components utilizing quadratic o… | 24 |
| 7 | CN108799318A | 一种应用于往复式压缩机曲轴上的动载轴承设计方法 | 22 |
| 8 | US20160341249A1 | compressor | 18 |
| 9 | US6309196B1 | Oiless rotary scroll air compressor antirotation lubrication mechanism | 16 |
| 10 | US20060171824A1 | Compressor connecting rod bearing design | 15 |
Citation counts inside this searched corpus favour older publications and should be read as a signal of influence, not of current technical relevance.
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.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the numbers imply for strategy
Three read-throughs from the filing trend, IPC spread and citation pattern that matter for anyone deciding where to file or partner next.
Growth has stalled since the 2019 peak
The midpoint year of 2022 sits at 11 filings, below the 2019 peak of 15, and the curve does not recover afterward. Combined with the 18-month publication lag, this points to a technology area where claim territory was staked out earlier in the window rather than one still being actively carved up.
Bearing claims ride inside compressor mechanism filings
Only 15 of 109 records sit in F16C, the dedicated bearings-and-shafts class. The bulk of tribology and wear-reduction language is embedded in rotary-piston and positive-displacement pump filings instead, meaning a bearing-specific search alone would miss most of the relevant art.
The most-cited records are compressor-system patents, not pure tribology
The highest-cited record in the set concerns a thermoacoustic driven compressor rather than a bearing or wear-surface claim specifically, and several other top-cited records address lubricant management or oil-less operation. Influence in this corpus concentrates around system-level compressor architecture, with tribology treated as a supporting claim.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to reciprocating compressor bearing and tribology, with the prior art for and against each one.
Assignee landscape and collaboration patterns
Ten co-assignee pairs appear in the dataset, each linking a corporate assignee to a named inventor, and recent-year momentum is flat across every tracked assignee.
Filings pair a single corporate assignee with a named inventor
The strongest co-assignee pairs each appear twice, linking a corporate entity to one individual inventor rather than showing multi-company joint filings. This is consistent with in-house R&D programmes rather than cross-company development deals.
No assignee is currently pulling ahead
Every assignee tracked for recent-year momentum shows zero filings in the most recent year. Given the roughly 18-month publication lag, this likely understates true recent activity, but it also means no single player's public filing record currently signals an accelerating push.
Filing activity concentrates in Europe and the US
The EPO and USPTO together account for the largest share of receiving-office activity, with Canada, WIPO/PCT and Australia forming a secondary tier. This office mix suggests protection strategies built around European and North American compressor and HVAC markets first.
| Assignee | Recent year | YoY |
|---|---|---|
| Westinghouse Air Brake Technologies Corporation (Wabtec) | 0 | — |
| Trane International Inc. | 0 | — |
| Nuovo Pignone Tecnologie S.r.l. | 0 | — |
| Aksomik Inc. | 0 | — |
| Whirlpool S.A. | 0 | — |
| ENOVA INC | 0 | — |
| Ohio State University Research Foundation | 0 | — |
| Carrier Corporation | 0 | — |
Where to take this analysis
The filing and citation data point to specific next steps depending on whether the goal is freedom-to-operate, sourcing partners, or finding open claim territory.
Map claims against the F16C gap
With only 15 of 109 records in the dedicated bearing class, a claim-by-claim review of what F04C and F01C filings actually cover for bearing hardware would clarify how much genuine white space exists in F16C itself.
Explore claim mapping in Eureka →Track the lag-affected final year
The most recent year is partial due to publication lag; re-running this trend in two to three quarters will show whether the plateau since 2019 is holding or beginning to move.
Set up filing alerts in Eureka →Review the top-cited system patents
Because citation weight concentrates in system-level compressor architecture rather than pure tribology claims, a deeper read of the highest-cited records may reveal which system designs are shaping downstream bearing and wear-surface choices.
Open the citation network in Eureka →Common questions on this landscape
The dataset tracks 109 patent families across assignees including Whirlpool, Carrier, Trane, and several named individual inventors linked through co-assignee filings. No single assignee shows filing activity in the most recent tracked year, and the strongest co-assignee links appear only twice each, indicating a fragmented rather than concentrated ownership pattern. Anyone doing freedom-to-operate work should treat this as a field with a moderate number of active players rather than one or two dominant holders.
Filing activity peaked in 2019 at 15 families and has not exceeded that level since; the 2022 midpoint sits at 11, below the peak. Combined with an approximately 18-month lag between filing and publication, the apparent drop in the final tracked year is likely partly an artefact of incomplete data rather than a confirmed decline. Even accounting for the lag, the overall shape is a plateau, not sustained growth.
Most of the relevant art sits in rotary-piston and positive-displacement pump classes — F04C (39 records) and F01C (36 records) — rather than in the dedicated bearing classification F16C, which holds only 15 records. This means a search limited to F16C would miss the majority of bearing and wear-reduction claims in this field, because they are typically filed as part of a broader compressor mechanism patent. F04B, at 29 records, is the third-largest class and covers positive-displacement pump variants closely related to reciprocating compressors.
US20140345418A1, assigned to Whirlpool S.A. and filed in 2014, claims a connecting rod for a reciprocating compressor with regions of oriented resilient deformation built into the rod body itself, designed to compensate for piston misalignment and deflection. This is a structural, in-rod solution rather than a separate bearing or bushing component, so it primarily constrains designs that place compensating flexibility inside the connecting rod geometry in a similar oriented, two-region arrangement. Designs that address alignment and deflection through a separate bearing surface, a different rod geometry, or a different number or orientation of deformation regions would sit outside this specific claim structure, though a full claims-and-prosecution-history review is needed before relying on that distinction.
The clearest gap is the dedicated bearing-and-shaft class F16C, which at 15 records is thin relative to the 75 combined records in F04C and F01C — suggesting bearing-specific claims that are not bundled into a full compressor mechanism are comparatively under-filed. Reciprocating-specific F01B, with only 3 records, and engine-cylinder class F02F, with 4, are similarly light. These thinner branches are worth a closer claims review before assuming they are open, since low volume can also reflect that the subject matter is genuinely narrow rather than unclaimed.
Research Reciprocating Compressor Bearing and Tribology in depth with Eureka
Go past this page: query the whole reciprocating compressor bearing and tribology corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.