Reciprocating Compressor Testing Patents: Leaders & White Space 2026
- Filing activity peaked in 2019 at 11 records and has not returned to that level since, with the 2022 midpoint at 7 — a flat-to-declining trend rather than an accelerating one.
- The technology sits across eight IPC subclasses from reciprocating machines (F01B, 30 records) and refrigeration (F25B, 27) down to spraying and atomising (B05B, 14), showing testing claims spread thin rather than concentrated.
- United States receiving-office filings dominate at 69 of the tracked records against 17 at the EPO and single digits everywhere else, meaning most of the enforceable claim density sits in one jurisdiction.
What this landscape covers
Reciprocating compressor testing and inspection covers the methods and instrumentation used to verify performance testing, valve inspection and leakage testing on piston and reciprocating compressor systems. The dataset behind this page pulls 129 patent families published between 2015 and the 2026 cut-off, filtered on title, abstract and claim text for these three test disciplines rather than compressor hardware generally.
Because publication typically lags filing by around 18 months, the most recent filing year in the trend below is undercounted and should not be read as a drop-off on its own. The composition and assignee sections that follow are drawn from the same 129-family set and are the basis for the rest of this page.
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Filing trend and technology composition
Two views of the same 129 families: how filing activity has moved year over year, and which IPC subclasses the testing and inspection claims actually sit in.
A flat trend since the 2019 peak
Filings rose from zero in 2017 to a peak of 11 in 2019, then settled near the 2022 midpoint of 7. That pattern reads as a mature, steady-state filing rate rather than a technology in an active growth phase — useful context before assuming this is a fast-moving space.
Spread across eight subclasses, not one
F01B (reciprocating machines, 30 records) and F25B (refrigeration and heat pumps, 27) lead, followed closely by F04B (positive-displacement pumps, 24) and F01K (steam and thermal power, 20). The presence of A61H (physical therapy) and A41D (garments) among the top subclasses signals that some of these families are adjacent applications — pneumatic actuation or wearable pressure devices — rather than industrial compressor test rigs, which is worth filtering for when scoping a freedom-to-operate search.
Shares are the percentage of the 129 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Reciprocating Compressor Testing and Inspection with Eureka
This page is one run against one query. Ask Eureka your own question about reciprocating compressor testing and inspection and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records and a representative filing
Refrigerant compressor group (US20230007826A1)
A refrigerant compressor group for a refrigeration system, comprising at least two piston compressors that operate in parallel between a common low-pressure connector and a common high-pressure connector, wherein, for the purpose of adjusting it to different requirements, it is provided, in a refrigerant compressor group, for a variable overall mass flow throughput in the refrigerant compressor group to be adjustable in that, in the case of at least one of the piston compressors, its mass flow throughput is adjustable by speed selection with the aid of a frequency converter for the electric motor, and in that, in the case of at least one of the piston compressors, its mass flow throughput is…Filed by Bitzer Kuehlmaschinenbau, published 2023-01-12.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20110115223A1 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 220 |
| 2 | US20100326075A1 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 143 |
| 3 | US20100329903A1 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 136 |
| 4 | US8436489B2 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 128 |
| 5 | US20110023488A1 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 110 |
| 6 | US20110023977A1 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 109 |
| 7 | US20110030359A1 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 105 |
| 8 | US8065874B2 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 102 |
| 9 | US8240142B2 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 98 |
| 10 | US8191360B2 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange | 91 |
Citation counts favour older filings inside any searched corpus; treat them as a signal of influence on later work, not of current commercial relevance. Note that the top five most-cited records in this set all share the same compressed-air energy storage title family, which concentrates citation weight rather than spreading it across distinct inventions.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three patterns stand out once the raw counts are set against jurisdiction and technology spread.
Most enforceable claim density sits in the US
With 69 records filed through the US receiving office against 17 at the EPO and single digits elsewhere (WIPO 8, Canada 7, Germany 5, Austria 4), a design-around or clearance search that stops at EPO coverage will miss most of the active claim territory.
Activity has plateaued since 2019
The absence of sustained year-on-year growth after 2019 suggests the core testing methods — pressure decay, valve-lift monitoring, acoustic leak detection — are largely staked out, and new filings are more likely to be incremental refinements than foundational claims.
Claims cross compressor, refrigeration and adjacent domains
The subclass mix spans core reciprocating-machine and refrigeration codes (F01B, F25B, F04B) alongside steam plant, gas turbine, physical therapy and spraying codes, indicating the underlying test methods have been claimed inside several different end-use contexts rather than as a single unified art.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to reciprocating compressor testing and inspection, with the prior art for and against each one.
Who is filing, and where the activity has gone quiet
Recent-year momentum across the tracked assignees is flat: none of the named organisations in this dataset show filings in the latest year, consistent with the plateau seen in the overall trend.
Bitzer and refrigeration compressor makers
Bitzer's 2023-published refrigerant compressor group filing is the most recent representative record in this set, covering parallel piston-compressor throughput control — an operational claim adjacent to, rather than squarely inside, dedicated testing methods.
Compressed-air energy storage cluster
The five most-cited records in the corpus all belong to a single compressed-air energy storage title family, showing that citation weight here is concentrated in one earlier line of invention rather than spread across the current testing-method filers.
A small number of tightly linked filer pairs
Co-assignee activity is limited to 10 pairs, with the strongest links tied to a medical-device and hospital pairing and to an energy company filing alongside named individual inventors — patterns typical of applied research partnerships rather than broad industry consortia.
| Assignee | Recent year | YoY |
|---|---|---|
| LightSail Energy | 0 | — |
| Cytoprotective Devices, Inc. | 0 | — |
| Children's Hospital | 0 | — |
| FERIA RALPH | 0 | — |
| Rhodia | 0 | — |
| Bitzer Kuehlmaschinenbau GmbH | 0 | — |
| Atlantic Richfield Company | 0 | — |
| POURMOUSA ABKENAR AMIRHOSSEIN | 0 | — |
Where to take this next
The trend and composition data point to a plateaued but jurisdictionally concentrated field. Two directions make sense from here.
Run a targeted freedom-to-operate check
Given that 69 of 129 records sit in the US, any product intended for the US market should start clearance search there rather than at the EPO or WIPO, and should explicitly filter out adjacent-domain families (A61H, A41D) that share IPC codes but not the same test methods.
Open a search in EurekaMap the under-claimed sub-areas before filing
The gate chips above — acoustic valve-flutter detection, frequency-converter-linked diagnostics and similar branches — show lighter filing density than the core F01B/F25B subclasses and are worth a closer prior-art pull before drafting new claims.
Explore white space in EurekaCommon questions about this landscape
This dataset tracks 129 patent families published between 2015 and the 2026 cut-off, filtered specifically on performance testing, valve inspection and leakage testing language rather than compressor hardware generally. Using families instead of raw document counts avoids double-counting continuations and parallel filings across jurisdictions. Because publication lags filing by roughly 18 months, the true count for the most recent year is understated in any trend chart drawn from this data.
Filing activity peaked in 2019 at 11 records and had fallen back to 7 by the 2022 midpoint, which points to a flat or slightly declining trend rather than sustained growth. That pattern is more consistent with a field where core test methods are already staked out and new work is incremental. Anyone assessing whether to enter this space should weigh that plateau against the specific sub-area they plan to file in, since composition varies a lot by IPC subclass.
The United States receiving office accounts for 69 of the 129 tracked records, far ahead of the European Patent Office at 17 and WIPO PCT filings at 8, with Canada, Germany and Austria each in single digits. That concentration means a clearance search focused only on European filings will miss most of the active claim territory. Companies planning US market entry should treat US prior art as the primary risk pool.
US20230007826A1, assigned to Bitzer Kuehlmaschinenbau and published 2023-01-12, describes a refrigerant compressor group with at least two piston compressors operating in parallel, where overall mass flow throughput is adjusted by varying the speed of at least one compressor via a frequency converter. It is an operational control claim for multi-compressor refrigeration systems rather than a dedicated testing or inspection method. Anyone designing variable-throughput piston compressor banks with frequency-converter speed control should review this filing's specific claim scope before finalising a control architecture.
The technology composition spreads across eight IPC subclasses with no single area dominating, and sub-areas such as acoustic valve-flutter detection, frequency-converter-linked diagnostics and portable pressure-decay rigs show lighter filing density than the core F01B and F25B subclasses. That gap suggests room for narrowly drafted method claims combining sensing technique with a specific compressor operating mode. A prior-art pull focused on those specific combinations, rather than the broad subclass, is the more efficient way to confirm openness before drafting.
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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.