Flexible Slabstock Foam Patents: Top Companies & Filing Trends 2026
- 33.5% of all 3,646 records sit with just five assignees, while the ranked leaders extend to 100 companies with a long single-filing tail below them.
- Filings fell 21% from 2021 to 2024 (62 to 49), the most recent span the data can call complete once publication lag is accounted for.
- C08G condensation-polymer claims cover 78.4% of records leaving additive, processing-aid and shaping classes comparatively thin by comparison.
Filing growth compares 2021 (62 records) with 2024 (49) — 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 3,646 records in scope (CR5), not by the ranked leaders only.
What this patent set covers
Flexible slabstock foam production sits at the intersection of formulation chemistry and continuous-process engineering: polyol and isocyanate reactivity, catalyst selection, and the physical control of rise, cell opening and cooling that turns a liquid reaction mixture into a stable, open-cell block. The search behind this landscape combines slabstock- and flexible-foam terminology with the process-control vocabulary practitioners actually use in claims — indentation load deflection, cell opening, airflow value, scorch prevention, block cooling and tin catalyst — rather than relying on a single broad foam keyword.
The 3,646 records in scope span filings from 2015 through the mid-2026 data cut-off, giving a decade-plus view of how catalyst chemistry, additive packages and process controls have been claimed by the same handful of large materials companies that have supplied this industry for decades, alongside a long tail of single-filing entrants.
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Filing trend and technology composition
Two views of the same 3,646 records: how filing activity has moved year over year, and how those records distribute across the IPC subclasses that structure the chemistry and processing side of the field.
A peak in 2017, then a step down
Annual filings peaked at 156 in 2017. The 2021-to-2024 span, the most recent period the dataset can treat as complete given an 18-month publication lag, shows a decline from 62 to 49 filings, a 21% drop. Years after 2024 are still filling in and should not be read as a continued fall.
Condensation-polymer claims dominate
C08G (condensation polymers) appears in 78.4% of the 3,646 records, far ahead of C08J processing and solutions claims at 35.2%. Additive (C08K, 16.1%), composition (C08L, 15.7%) and shaping (B29C, 6.0%) classes are present but comparatively thin, and since records can carry multiple IPC codes these shares add up to more than 100%.
Shares are the percentage of the 3,646 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Flexible Slabstock Foam Production with Eureka
This page is one run against one query. Ask Eureka your own question about flexible slabstock foam production and every answer comes back with the patent numbers behind it.
Try EurekaA representative record
Preparation of polyurethane foams without using inert blowing agents (US4950694A)
A process for making low density and optionally low resilience, soft, flexible polyurethane slabstock foam having a substantially open cell structure without crushing, without requiring auxiliary inert blowing agents, by reacting a conventional hydroxyl-containing polyether polyol with a polyisocyanate at an isocyanate index of between about 60 and 95 in the presence of a foam processing aid comprising a low equivalent weight crosslinking agent and/or extending agent and, as needed, a cell opening agent.Filed by General Electric Company, 1990-08-21 — illustrates how early cell-opening and index-control claims in this field were framed before additive-package claiming became dominant.
View full record| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20140163664A1 | Integrated system for the ballistic and nonballistic infixion and retrieval of implants with or without drug … | 965 |
| 2 | US6120904A | Medical device coated with interpenetrating network of hydrogel polymers | 671 |
| 3 | US6080488A | Slippery, tenaciously adhering hydrophilic polyurethane hydrogel coatings, coated metal substrate materials, … | 550 |
| 4 | WO2004096882A1 | Vegetable oil based polyols and polyurethanes made therefrom | 545 |
| 5 | US20190247050A1 | Integrated system for the infixion and retrieval of implants | 450 |
| 6 | WO2004096883A1 | Dow global technologies inc | 338 |
| 7 | US4147847A | Method of preparing flexible flame retardant polyether based one-shot polyurethane foams and compositions the… | 304 |
| 8 | US6017577A | Slippery, tenaciously adhering hydrophilic polyurethane hydrogel coatings, coated polymer substrate materials… | 265 |
| 9 | US20070072951A1 | Silanol-functionalized compounds for the preparation of polyurethane foams | 261 |
| 10 | US5576072A | Process for producing slippery, tenaciously adhering hydrogel coatings containing a polyurethane-urea polymer… | 252 |
Citation counts favour older filings simply by virtue of having had more time to accumulate them; treat them as a signal of influence within this corpus, 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 numbers actually indicate
Three read-throughs from the filing trend, the IPC split and the citation table, each with a caveat on how far it can be pushed.
Ownership is concentrated but not locked
Five assignees hold a third of all records in scope, and the top ten extend that to 44.3%. That leaves the majority of filings spread across a long tail of smaller and single-filing entrants, which is where freedom-to-operate work usually needs to look first.
Activity has stepped down from its 2017 peak
The 156-filing peak in 2017 has not been repeated; the last complete three-year window shows a 21% decline. Because publication lags filing by roughly 18 months, 2025 and 2026 figures are still incomplete and should not be read as confirming or denying a continued slide.
Base chemistry claim space is crowded
Condensation-polymer claims under C08G touch nearly four in five records, meaning core polyol-isocyanate reaction claims are heavily occupied. Processing (C08J) and additive (C08K) classes carry noticeably fewer records, which is a sharper signal about where claim density is lighter, not proof those areas are unimportant.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to flexible slabstock foam production, with the prior art for and against each one.
Who holds the claim space
The ranked leaders come from the established polyurethane raw-materials suppliers; most of the field's 100 ranked companies file far less frequently, and recent-year activity for the largest names has gone quiet in the latest tracked year.
One materials supplier leads by a wide margin
The top-ranked assignee's record count is more than double the fifth-place figure of 135, indicating a sustained multi-decade filing programme rather than a recent push.
A steep drop after the top tier
Filings fall from 135 at fifth place to 50 at tenth, showing the concentration is front-loaded: a handful of names carry most of the top-ten share of 44.3%.
Even top filers show zero latest-year activity
Several of the largest historical filers, including assignees with -100% year-on-year change, show no filings in the most recent tracked year. Given publication lag, this understates true recent activity but still signals a pause relative to their historic pace.
| Assignee | Recent year | YoY |
|---|---|---|
| Dow Global Technologies LLC | 0 | — |
| Evonik Operations GmbH | 0 | -100% |
| The Dow Chemical Company | 0 | — |
| Air Products and Chemicals, Inc. | 0 | — |
| Huntsman International LLC | 0 | — |
| BASF SE | 0 | -100% |
| Arco Chemical Technology, Inc. | 0 | — |
| Shell Internationale Research Maatschappij B.V. | 0 | — |
Where to take this analysis
The dataset points to specific follow-up work rather than a single conclusion.
Map freedom-to-operate against the leader's portfolio
With one assignee holding 382 records against a fifth-place figure of 135, a targeted claim map of that single portfolio will do more for FTO work than scanning the full ranked list.
Explore assignee portfolios in EurekaWatch the under-claimed process branches
Cell-opening, block-cooling and scorch-prevention claims sit outside the dominant C08G chemistry classes and show comparatively lighter density, worth a closer look before committing new claim language there.
Run a white space search in EurekaRe-check the 2025-2026 trend once it settles
Publication lag means the apparent step-down after 2024 is not yet a confirmed trend; a follow-up pull once 2025 filings finish publishing will clarify whether the decline continues.
Set a filing-trend alert in EurekaQuestions practitioners ask about this field
The ranking covers 100 companies, with a single leader holding 382 records, well ahead of the fifth-placed assignee at 135. The top five assignees combined account for 33.5% of all 3,646 records in scope, and the top ten reach 44.3%. Below that concentration sits a long tail of companies with only a handful of filings each, so freedom-to-operate work should prioritise the leading names first and treat the tail as a secondary check.
Filing activity peaked in 2017 at 156 records and has since stepped down; the most recent complete three-year window shows a 21% decline from 62 filings in 2021 to 49 in 2024. Because patent publication lags actual filing by roughly 18 months, the 2025 and 2026 figures in the dataset are still incomplete and should not yet be read as confirming a continued fall. A fair read is that activity has cooled from its 2017 peak but the very latest trend is not yet settled in the data.
Core reaction chemistry dominates: C08G, covering condensation polymers, appears in 78.4% of the 3,646 records in scope. Processing and solution-related claims (C08J) follow at 35.2%, with additive use (C08K) and polymer compositions (C08L) each in the 15-16% range, and shaping-related claims (B29C) at 6.0%. Because records commonly carry more than one IPC class, these figures add up to well over 100% and should not be read as mutually exclusive shares of a whole.
Relative to the crowded core chemistry classes, process-control branches such as cell-opening agents, continuous block-cooling, scorch-prevention additive packages and airflow-value monitoring show comparatively lighter record density. This does not mean these areas are unclaimed, but claim space there is less occupied than the base polyol-isocyanate reaction chemistry under C08G. A prudent next step is a targeted search within those specific process branches before drafting new claims.
US4950694A, filed by General Electric Company and issued in 1990, claims a process for making low-density, substantially open-cell flexible polyurethane slabstock foam without auxiliary inert blowing agents, using a polyether polyol and polyisocyanate reacted at an isocyanate index between about 60 and 95 with a foam processing aid that includes a crosslinking or extending agent and, where needed, a cell-opening agent. It is useful as a reference point for how index-control and cell-opening claims were framed before additive-package claiming became the dominant approach. Anyone drafting in this space should check current claim scope in the underlying chemistry classes rather than relying on this older filing alone.
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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.