Catalysis & Reactor Design Patents: Top Companies & Trends 2026
- Filing activity peaked in 2021 at 802 records and had fallen to 429 by 2024, a 47% drop over that three-year span — the clearest complete-year signal in the dataset.
- Ten companies account for 54.8% of all 4,491 records in scope with the single leader holding 506 records, more than three times the tenth-place filer's 140.
- B01J (catalysis processes) and C07C (carbocyclic compounds) dominate the IPC mix at 5,322 and 3,571 record-class tags respectively, showing the field's centre of gravity is still classic catalytic chemistry, not downstream separation or water treatment.
Filing growth compares 2021 (802 records) with 2024 (429) — 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 4,491 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks patent activity at the intersection of catalytic process chemistry and reactor engineering — records that combine claims on chemical process catalysis or reactor design with claims on reaction medium behaviour, process-stream handling, mass transfer, product selectivity, process control or reaction kinetics. It spans 4,491 published records filed between 2015 and the current data cut-off, drawn primarily from filings at the United States, European (EPO), WIPO/PCT, Canadian, Australian and Indian offices.
The scope deliberately pairs process-level claims (catalysis, reactor architecture) with operational-control claims (kinetics, selectivity, mass transfer), so it captures both new reactor hardware and the process-control logic that runs inside existing hardware. Readers using this page to decide where to file, or whom to watch, should treat the 2025-2026 filing counts as provisional: publication lags filing by roughly 18 months, so the most recent years are always undercounted at the point of any given data pull.
Filing trends and technology composition
Two views of the same 4,491-record dataset: how filing volume has moved year over year, and how records distribute across the IPC subclasses that define the field's technical boundaries.
Filing trend, 2017-2026
Filings rose from 451 in 2017 to a peak of 802 in 2021, then declined to 429 by 2024 — a 47% fall over that three-year window. 2025 and 2026 figures (down to 64 in the latest partial year) are not yet comparable, since publication lag means recent filings are still arriving in the record.
Technology composition by IPC subclass
B01J (chemical/physical processes and catalysis) leads at 5,322 record-class tags, followed by C07C (acyclic and carbocyclic compounds) at 3,571 and C01B (non-metallic elements and inorganic compounds) at 1,922. Hydrocarbon refining (C10G), separation processes (B01D), addition polymers (C08F), water treatment (C02F) and microorganism/genetic engineering (C12N) all register meaningful but smaller footprints. Because a single record can carry several IPC tags, these counts are not shares of the 4,491-record total and should not be added together.
Shares are the percentage of 29,238 class assignments (one record can carry several), not of the record count.
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Try EurekaThe records other filers had to design around
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5879459A | Vertically-stacked process reactor and cluster tool system for atomic layer deposition | 1,245 |
| 2 | US4499327A | Production of light olefins | 1,064 |
| 3 | US20160045841A1 | New and improved system for processing various chemicals and materials | 860 |
| 4 | WO1996004547A1 | Apparatus and method for performing microfluidic manipulations for chemical analysis and synthesis | 853 |
| 5 | US5858195A | Apparatus and method for performing microfluidic manipulations for chemical analysis and synthesis | 817 |
| 6 | US5627242A | Process for controlling gas phase fluidized bed polymerization reactor | 814 |
| 7 | US20040099213A1 | Spatially programmable microelectronics process equipment using segmented gas injection showerhead with exhau… | 800 |
| 8 | US6174377B1 | Processing chamber for atomic layer deposition processes | 677 |
| 9 | US6821910B2 | Spatially programmable microelectronics process equipment using segmented gas injection showerhead with exhau… | 668 |
| 10 | US20050072357A1 | Sublimation bed employing carrier gas guidance structures | 646 |
Citation counts reflect influence within this searched corpus and skew toward older records simply because they have had longer to accumulate citations — treat them as a signal of historical influence, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the filing pattern tells a decision-maker
Three read-outs from the concentration, timing and classification data — useful for deciding where a new filing is likely to clear and where it will land on top of existing claims.
Filing activity is concentrated but not locked down
The top 5 assignees combined hold 35.5% of all 4,491 records in scope, and the top 10 hold 54.8%. That leaves close to half the field split across a long tail of single- and few-filing entrants — a pattern consistent with a technology where core catalytic chemistry is claimed by a handful of majors but application-specific reactor and process-control variants remain open to newer filers.
The 2021 peak has not been sustained by the leaders
Filings fell 47% from the 2021 peak of 802 to 429 in 2024, the last year that can be read as complete. Momentum data for individual leading assignees shows several posting zero filings in the latest tracked year, with year-over-year drops of 100% for some — a sign that the leaders who built their positions earlier in the decade are not currently refreshing them at the same pace.
Core catalysis claims outweigh downstream processing
B01J (catalysis) and C07C (carbocyclic compounds) carry far more record-class tags than separation (B01D), polymer (C08F), water treatment (C02F) or bioprocessing (C12N) subclasses. That skew suggests the densest prior art sits in reaction-side chemistry, while process-integration claims that combine catalysis with downstream separation or water handling are comparatively less crowded.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to catalysis & reactor design patent landscape, with the prior art for and against each one.
Who holds the ground, and where a newcomer could still file
The ranked leaders in this dataset are large integrated chemical and refining companies with decades of reactor and catalyst portfolios; the co-filing pairs below them show where individual inventors carry outsized weight inside a single assignee's programme.
One filer holds close to double the fifth-place count
The leading assignee's 506 records sit well ahead of fifth place at 213 and tenth place at 140 — a gap that widens faster than a simple ranked decline, indicating a genuine leader rather than a cluster of near-equal peers.
Named-inventor pairs cluster inside one major filer
The strongest co-assignee pairings in the dataset — each appearing on 23 shared records — all involve the same corporate assignee paired with different named inventors, suggesting a stable internal team rather than an external joint-filing relationship.
Several top-10 filers show zero recent activity
More than one of the leading assignees recorded zero filings in the latest tracked year, with year-over-year change of -100% where a prior-year baseline existed. Read this alongside the publication lag: some of this is filings still working through to publication, but the pattern is consistent across multiple leaders, not one outlier.
| Assignee | Recent year | YoY |
|---|---|---|
| Eastman Chemical Company | 6 | -50% |
| ExxonMobil Chemical Patents Inc. | 0 | — |
| E.I. du Pont de Nemours and Company | 0 | — |
| Dow Global Technologies LLC | 0 | -100% |
| ExxonMobil Technology and Engineering Company | 0 | -100% |
| UOP LLC | 0 | -100% |
| Univation Technologies, LLC | 0 | — |
| Battelle Memorial Institute | 0 | -100% |
Where to take this analysis
The dataset points to a field with a concentrated core and an open perimeter. The next step is usually narrower than a landscape page: checking a specific claim against a specific filer's portfolio.
Test a claim against the leading filers
Run a candidate reactor or process-control claim against the portfolios of the leading assignees identified here before drafting, especially where it touches core B01J catalysis or C07C chemistry classes.
Explore in Patsnap Eureka →Track momentum shifts as 2025-2026 data fills in
Because publication lag understates the most recent two years, revisit the filing trend once those years mature rather than concluding the field is contracting on today's numbers alone.
Set up monitoring in Patsnap Eureka →Map the under-claimed branches in detail
The gate chips above point to specific sub-areas with lighter claim density; a focused search on any one of them will show whether that openness is real or an artefact of classification.
Run a deeper search in Patsnap Eureka →Common questions about catalysis and reactor design patents
The dataset's leading assignee holds 506 records, roughly double the fifth-place filer's 213 and well ahead of the tenth-place filer's 140. The top 5 filers combined account for 35.5% of all 4,491 records in scope, and the top 10 account for 54.8%. These leaders are large integrated chemical, refining and materials companies with catalyst and reactor programmes spanning multiple decades, though several of them show little to no filing activity in the most recent tracked year.
Filing volume peaked in 2021 at 802 records and fell to 429 by 2024, a 47% decline over that three-year span — the most reliable read available, since 2024 is the last year unaffected by publication lag. Figures for 2025 and 2026 are lower still, but that reflects the roughly 18-month delay between filing and publication rather than a confirmed drop in filing activity. Anyone using this trend to decide whether to file should treat only the 2021-2024 window as settled data.
B01J, the IPC subclass covering chemical and physical processes including catalysis, carries the most record-class tags at 5,322, followed by C07C (acyclic and carbocyclic compounds) at 3,571 and C01B (non-metallic elements and inorganic compounds) at 1,922. Hydrocarbon refining, separation processes, addition polymers, water treatment and microorganism-based processes each have a smaller but non-trivial footprint. Because records often carry multiple IPC tags, these figures describe relative density rather than shares of the total record count.
The classification data suggests lighter claim density where core catalysis intersects with separation, water treatment or bio-based processing, rather than in the reaction chemistry itself, which is heavily claimed under B01J and C07C. Combinations such as integrated catalysis-separation reactor trains, selectivity control through reaction-medium engineering, and catalytic water treatment coupling appear less saturated based on the subclass composition. Confirming genuine white space still requires a targeted freedom-to-operate search against the specific claim language intended, not just a subclass-level read.
The United States leads with 4,188 records in this dataset, followed by the European Patent Office at 2,197 and WIPO/PCT filings at 2,007. Canada, Australia and India follow at 1,029, 946 and 859 records respectively. This distribution reflects where applicants filed within the scope of this search and is not a complete picture of global filing activity outside these offices.
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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.