Centrifugal Pump Machining Patents: Who Leads, Filing Trends 2026
- Filing peaked in 2023 at eight records, then eased back — a flat-to-declining trend rather than a growth curve, with every filing routed through China's receiving office.
- Machine tool fittings (B23Q) dominate the claim space appearing in 38 of 40 records, while turning/boring (B23B) and milling (B23C) trail well behind at 12 and 5.
- No single assignee is filing at scale right now the tracked names in the momentum table all show zero filings in the latest year, including a 100% year-on-year drop for one repeat filer.
What this dataset covers
This landscape tracks 40 patent families filed between 2015 and 2026 that combine centrifugal pump or impeller terminology with claims over impeller machining, 5-axis machining, surface-finish machining or precision balancing, classified under F04D29/22, B23Q or F04D29/02. Every record in the set was filed through China’s receiving office, which makes this a China-centric view of the technology rather than a global one.
The picture is one of tooling and fixturing innovation layered onto a mature pump architecture: most claims describe how to hold, drill or clamp an impeller during machining, not how to redesign the impeller itself. Publication typically lags filing by around 18 months, so the 2025-2026 count in any trend chart is understated relative to what has actually been filed.
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Filing trend and technology composition
Two views of the same 40-family dataset: how filing volume has moved year over year, and how those filings split across IPC subclasses.
Annual filings, 2017-2026
Filings rose from a single record in 2017 to a peak of eight in 2023, with the 2022 midpoint sitting at just two — evidence of a late, short-lived filing burst rather than sustained growth. The 2026 figure is partial and will rise as later-filed applications publish.
IPC subclass distribution
B23Q (machine tool fittings) appears in 38 of 40 records, making fixturing and workholding the dominant claim territory. B23B (turning/boring) and B23C (milling) cover a much smaller share, and single-digit counts in B23D, B23P, B25B and B22C mark peripheral or exploratory filing rather than established claim space.
Shares are the percentage of the 40 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Centrifugal Pump Precision Machining with Eureka
This page is one run against one query. Ask Eureka your own question about centrifugal pump precision machining and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a recent representative filing
CN120984955A — Mechanical oil pump impeller drilling-milling machine and machining method
The filing targets a specific inefficiency in impeller production: repeated re-clamping across separate operations, which the abstract ties directly to low precision and low throughput. Its machine integrates a workpiece clamping mechanism with dedicated slotting and porting mechanisms so that the milled channel and the equally spaced oil ports are cut in one setup, cutting the number of re-clamping steps needed.Filed 2025-11-21 by Aoguan Machinery (Ningbo) Co., Ltd. — illustrates the fixturing-integration approach that dominates recent filing activity in this space.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN107552828A | 一种水泵叶轮加工用钻孔装置 | 7 |
| 2 | CN211162007U | 一种水泵叶轮加工用钻孔装置 | 5 |
| 3 | CN208880220U | 渣浆泵叶轮加工固定装置 | 4 |
| 4 | CN216178577U | 一种水泵叶轮加工用夹持装置 | 3 |
| 5 | CN210789309U | 一种水泵叶轮加工用钻孔装置 | 3 |
| 6 | CN116652292A | 一种水泵叶轮加工切割装置、切割方法及水泵叶轮 | 2 |
| 7 | CN212094525U | 一种水泵叶轮加工装置 | 2 |
| 8 | CN119550107A | 一种用于加工轴流泵叶轮外球面的装置及其使用方法 | 1 |
| 9 | CN116422978A | 一种能够消除震动的泵轮加工固定装置 | 1 |
| 10 | CN219900508U | 一种水泵叶轮加工切割装置 | 1 |
Citation counts reflect influence within this searched corpus and skew toward older records; they are not a measure of current commercial importance.
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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Browse MCP servers →What the numbers mean for a filing decision
Three signals stand out once the dataset is read for filing strategy rather than raw volume.
A short filing burst, not a sustained wave
Volume rose from one filing in 2017 to eight in 2023 before easing off, with the 2022 midpoint at only two. That shape points to a cluster of fixturing innovators reacting to a shared problem in a narrow window, rather than an industry-wide, multi-year build-out of claim territory.
Fixturing, not impeller redesign, is where claims sit
Nearly the entire dataset falls under B23Q, machine tool fittings — clamps, jigs and drilling guides built specifically to hold an impeller steady during machining. Turning, milling and sawing subclasses are present but thin, suggesting the cutting process itself is less contested than the workholding around it.
No active leader in the most recent year
Every assignee tracked for recent-year momentum, including a filer that dropped 100% year-on-year, shows zero filings in the latest year. Combined with the post-2023 decline in overall volume, this reads as a pause across the field rather than one company pulling ahead of the rest.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to centrifugal pump precision machining, with the prior art for and against each one.
Who is filing, and where the gate sits
The assignee set is a long tail of Chinese pump manufacturers, machinery workshops and individual inventors, with no single filer at obvious scale in the most recent year.
A domestic, fragmented field
Every one of the 40 tracked families was filed through China's receiving office. The assignee list mixes regional pump manufacturers, small machinery firms and individually named inventors, with no evidence in this dataset of a global filer building a defensive portfolio.
Momentum has stalled across the board
The recent-year momentum data shows every tracked assignee, including one with a 100% year-on-year drop, at zero filings in the latest year. That is consistent with the broader trend line easing back after its 2023 peak.
Workholding fixtures are the contested ground
With machine tool fittings present in almost every record, the practical gate for a new filer is less about the cutting process and more about how the impeller is clamped, indexed and released during machining.
| Assignee | Recent year | YoY |
|---|---|---|
| Qingdao Hailong Machinery Co., Ltd. | 0 | — |
| Tianjin Steel Pipe Manufacturing Co., Ltd. | 0 | — |
| Qingdao Gongli Technology Co., Ltd. | 0 | -100% |
| Chen Ying | 0 | — |
| Xiangyang Xinjinkai Pump Industry Co., Ltd. | 0 | — |
| Dong Qinmin | 0 | — |
| Shijiazhuang Jiuding Changyuan Technology Co., Ltd. | 0 | — |
| Shijiazhuang Weinaier Sealing Technology Co., Ltd. | 0 | — |
Where to take this analysis
The numbers here answer what has already been filed. Two follow-on checks turn that into a filing or freedom-to-operate decision.
Run a full-text claim comparison against B23Q fixtures
With 38 of 40 records sitting in machine tool fittings, a new clamping or workholding design needs claim-by-claim comparison against that cluster before drafting, not just an IPC-level scan.
Explore claim charts in EurekaTrack re-activation among paused assignees
Every tracked assignee shows zero filings in the latest year. A filer resuming activity is an early signal worth monitoring rather than a one-off data point.
Set up assignee alerts in EurekaCommon questions on centrifugal pump precision machining patents
Across this 40-family dataset, filing is fragmented among regional Chinese pump manufacturers, small machinery workshops and individually named inventors, with no single assignee showing filings in the most recent tracked year. The most-cited individual records are drilling-fixture patents for water pump impellers rather than filings from one dominant company. Anyone assessing freedom to operate should look at the fixture-claim cluster as a whole rather than expecting one blocking portfolio holder.
Filing rose slowly from a single record in 2017 to a peak of eight in 2023, with the 2022 midpoint at only two — a short, late burst rather than steady multi-year growth. Volume has eased since the 2023 peak, and every tracked assignee shows zero filings in the latest year. Because publication lags filing by roughly 18 months, the 2025-2026 counts will rise somewhat as pending applications publish, but the underlying trend is flat to declining.
B23Q, machine tool fittings, covers 38 of the 40 records in this dataset, making fixturing and workholding the dominant claim territory rather than the cutting process itself. B23B (turning and boring) and B23C (milling) appear at much lower counts, and subclasses like B23D, B23P, B25B and B22C are present only marginally. A new filing is statistically far more likely to run into a fixture or clamping claim than a turning or milling process claim.
CN120984955A, filed by Aoguan Machinery (Ningbo) Co., Ltd. in November 2025, describes a machine for a mechanical oil pump impeller that integrates a workpiece clamping mechanism with dedicated slotting and porting mechanisms. The stated purpose is to cut a milled channel and equally spaced oil ports in the impeller in one setup, reducing the number of times the part must be re-clamped. It is a recent, representative example of the fixturing-integration approach that runs through most of this dataset rather than an isolated outlier.
The IPC composition shows thin coverage in areas like in-process balancing correction, multi-axis blade-passage surface finishing, and the handoff between foundry casting and precision machining — all present in the broader classification set but not concentrated in any dense filing cluster. Thin coverage signals less occupied claim space, not necessarily an easier technical problem to solve. A first claim in these areas should be checked against the dominant B23Q fixture cluster before drafting, since a clamping element in an otherwise novel process can still collide with existing fixture claims.
Based on the trend data, filing activity peaked in 2023 at eight records and has since pulled back, with every tracked assignee showing zero filings in the latest year and one repeat filer down 100% year-on-year. That points to a pause across the field rather than sustained growth. It does not mean the underlying prior art has gone away — existing fixture and clamping patents from the 2019-2023 window still stand and should be checked before filing.
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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.