PVC Dechlorination Patents: Leaders, Trends & White Space 2026
Filing growth compares 2021 (9 records) with 2024 (4) — 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.
A small, technically concentrated field built on pyrolysis
PVC dechlorination sits at the intersection of plastics recycling and refining chemistry: waste polyvinyl chloride carries chlorine that fouls downstream fuel and feedstock streams, so patentable value concentrates on removing or converting that chlorine before or during recovery. Most documented activity routes through pyrolysis and hydrocarbon oil recovery rather than aqueous or electrochemical dehalogenation, which remain comparatively rare. With only 26 published records and three ranked assignees covering all of them, this is a narrow field rather than a crowded one — but narrow does not mean open, since the filings that exist claim the dominant thermal routes tightly.
Filing activity peaked in 2022 and has since declined through the last complete year on record, though publication lag of roughly 18 months means 2025 and 2026 figures are still filling in and should not be read as a slowdown yet.
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Filing trend and technology composition
Two views of the same 26 records: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
Filing trend: rise, peak, and pullback
Filings climbed to a peak of 10 in 2022, then eased to 9 in 2021 and down to 4 by 2024 — a 56% decline over that three-year window. Later years are still incomplete due to publication lag and should not be read as confirmed decline.
Technology mix: thermal routes lead by a wide margin
C08J (polymer processing and solutions) and C10G (hydrocarbon oils and refining) each cover more than half of all 26 records, followed by F23G incineration methods at 42.3%. Electrolytic routes under C25B appear in only 7.7% of records, marking the smallest and least-claimed branch tracked here.
Shares are the percentage of the 26 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Electrochemical co-production of halogen and hydrogen from waste plastic
The filing describes dissolving a halogen-containing polymer from waste in a solvent, then admixing it with an alkoxide base to dehalogenate the polymer and precipitate a dechlorinated product, leaving a halogen salt and alkyl alcohol in solution. That salt-alcohol stream is then fed into an electrochemical cell to co-produce halogen and hydrogen, turning what is normally a disposal problem — the chlorine stripped from PVC — into two separable output streams.Filed by the Regents of the University of Michigan, published 2026-04-09.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20220010213A1 | Process for PVC-containing mixed plastic waste pyrolysis | 28 |
| 2 | US20230039224A1 | Pyrolysis oil from recycled polymer having increased olefins and decreased chlorides and metals | 11 |
| 3 | WO2022011385A1 | A process for PVC-containing mixed plastic waste pyrolysis | 6 |
Citation counts reflect influence within this searched corpus and favour older filings; they are not a measure of current commercial importance.
Publication numbers are shown where the record carries one (3 of 3 rows); clicking a row searches Eureka by that number.
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Three findings that shape where a new filing would sit relative to existing claims.
No long tail to work around
Every record in scope traces to one of three ranked assignees. That is unusual for a chemical recycling niche and means freedom-to-operate analysis here is a short, specific exercise rather than a broad landscape scan.
Pullback after a 2022 peak
Filing volume peaked at 10 in 2022 and declined through 2024, the last year that can be treated as complete. Recent-year assignee activity is flat across the ranked leaders, consistent with a cooling rather than an exit.
Thermal routes crowd the claim space, electrochemical routes do not
Polymer processing and hydrocarbon refining classes cover the bulk of filings, while electrolytic dehalogenation sits under 8% of records. That gap is where claim space remains genuinely open rather than merely under-filed.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to chemical recycling & feedstock recovery — polyvinyl-chloride dechlorination patent landscape, with the prior art for and against each one.
Where to take this analysis
The landscape narrows to a short list of decisions: where to file, who to watch, and which branch is still open.
Map freedom-to-operate against three assignees
With 100.0% of records held by three parties, a targeted FTO review is faster here than in most chemical recycling niches — but it needs to cover pyrolysis and hydrocarbon recovery claims specifically, not just headline patent counts.
Explore assignee claims in EurekaTest claim scope in the electrochemical branch
C25B electrolytic routes sit at 7.7% of records, the thinnest coverage of any class tracked. A first claim drafted around electrochemical co-production of halogen and hydrogen from mixed waste plastic would sit largely clear of the dominant thermal-route filings.
Run a white space search in EurekaCommon questions on PVC dechlorination patents
The patent record in this field is concentrated among three ranked assignees, who together account for 100.0% of the 26 published records in scope. The leading filer alone holds 17 of those 26 records, with claims weighted toward pyrolysis and hydrocarbon oil recovery rather than electrochemical dehalogenation. This concentration means a new entrant faces a short, specific set of prior filings to design around rather than a sprawling field of competitors.
Filing activity rose to a peak of 10 records in 2022, then declined from 9 in 2021 to 4 in 2024, a 56% drop over that three-year span. Because publication typically lags actual filing by around 18 months, the 2025 and 2026 figures in any dataset are still incomplete and should not yet be read as confirmation of a continued slowdown. The most reliable read is that momentum cooled after 2022 rather than accelerated.
Polymer processing methods under IPC class C08J appear in 65.4% of the 26 records in scope, and hydrocarbon oil refining methods under C10G appear in 57.7%, making thermal pyrolysis-adjacent routes the dominant claimed technology. Incineration methods (F23G) and plastics preparation (B29B) follow at meaningfully lower shares. Electrolytic production methods (C25B) appear in only 7.7% of records, marking the least-claimed branch tracked in this dataset.
The clearest gap sits in electrochemical and electrolytic dechlorination, which covers only 7.7% of the 26 records in scope compared with over 65% for polymer processing routes. Solvent-based dehalogenation paired with downstream halogen salt recovery is also thinly represented relative to thermal pyrolysis claims. A filing that couples dehalogenation chemistry with electrochemical co-production of separable output streams, rather than pure thermal decomposition, would sit in one of the least-crowded parts of this landscape.
US20260098348A1, filed by the Regents of the University of Michigan and published 2026-04-09, describes an electrochemical process that dissolves a halogen-containing polymer from waste, dehalogenates it with an alkoxide base to precipitate a dechlorinated polymer, and then feeds the resulting halogen salt and alcohol solution into an electrochemical cell to co-produce halogen and hydrogen. It sits in the C25B electrolytic branch, which covers only 7.7% of the 26 records in this dataset, making it one of relatively few claims in that specific sub-area. Anyone designing a solvent-based dehalogenation-plus-electrolysis process for PVC waste should review its claim scope closely given how little competing prior art exists in that branch.
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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.