Retort Pouch Durability Patents: Leaders, Trends & Gaps 2026
- Filings plateaued after a 2021 peak of 107, easing to 95 in 2022 and tapering since — a maturing claim space, not a shrinking one.
- Laminate structure claims (B32B) outweigh barrier chemistry nearly 2:1, with 971 records against 592 in containers and packaging (B65D).
- Adhesive and condensation-polymer chemistry sit far behind at 142 and 108 records, marking the thinnest claim density in the dataset despite seal-integrity being a common failure point.
Filing growth compares 2021 (107 records) with 2024 (65) — 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 1,589 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape covers patent families addressing retort pouch environmental durability — heat resistance, puncture resistance and retort-process durability claimed across laminate structures, barrier chemistry and adhesive systems used in flexible retort packaging. The dataset spans 1,589 patent families published between 2015 and mid-2026, drawn from filings that reference retort pouches, retortable pouches or retort packaging alongside heat-resistance, puncture-resistance or retort-durability language.
Filing activity climbed steadily through the late 2010s, peaked in 2021, and has since plateaued — a pattern that tracks more closely with claim-space saturation in core laminate and barrier chemistry than with declining commercial interest in retort packaging itself. The technology composition skews heavily toward layered-product and container claims, with polymer composition and processing close behind and adhesive and condensation-polymer chemistry trailing well back.
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Filing trends and technology composition
Retort pouch durability filings peaked in 2021 and have since flattened, while the underlying technology composition shows structural laminate claims dominating over adhesive and condensation-polymer chemistry.
A post-2021 plateau, not a collapse
Filings rose from 48 in 2017 to a peak of 107 in 2021, held near that level through 2022 at 95, and have since tapered — a pattern consistent with a maturing claim space rather than an abandoned one. The most recent year is a partial count and will revise upward as publication catches up with filing.
Laminate structure dominates the IPC spread
B32B (layered products) accounts for the largest single share of records, roughly double the next-largest subclass, B65D (containers and packaging). Polymer composition and processing subclasses (C08L, C08J) trail behind, and adhesive (C09J) and condensation-polymer (C08G) chemistry sit at the bottom of the spread — a strong signal of where claim density is thin.
Shares are the percentage of the 1,589 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Retort Pouch Environmental Durability with Eureka
This page is one run against one query. Ask Eureka your own question about retort pouch environmental durability and every answer comes back with the patent numbers behind it.
Try EurekaThe records shaping this space
Heat resistant recycle-ready retort packaging
A laminated polypropylene-based film suitable for retort packaging having an exterior film, a barrier layer, and a sealing layer. The retort packaging film has a total composition including high levels of polyolefin-based polymers and polypropylene-based polymers such that the material can be processed efficiently in a polypropylene recycling process. Advantageously, the film retains the properties required to suitably withstand the retort process and produce a high-quality shelf-stable packaged product.Filed by Amcor Flexibles North America, this 2023 application pairs retort survival with mono-material recyclability — a combination largely absent from the older citation leaders in this dataset.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5409777A | Laminates of polymer shaving perfluorocyclobutane rings | 168 |
| 2 | US5998039A | Polypropylene composition and uses thereof | 156 |
| 3 | EP1614699A1 | Propylene copolymer, polypropylene composition, use thereof, transition metal compounds, and catalysts for ol… | 125 |
| 4 | EP0590263A2 | Gas barrier resin composition and process for producing the same | 105 |
| 5 | US6914091B2 | Compositions comprising hydrogenated block copolymers and end-use applications thereof | 103 |
| 6 | US6126315A | Container formed of lamination sheet | 102 |
| 7 | EP0716121A1 | Composition of polypropylene with propylene-butene elastomer | 101 |
| 8 | US4856650A | Oxygen absorbent package | 100 |
| 9 | US5700560A | Gas barrier resin composition and its film and process for producing the same | 97 |
| 10 | US5997765A | Liquid crystal polyester resin composition | 90 |
Ranked by citation count within this searched corpus; older laminate and composition patents lead, reflecting years of accumulated citation rather than current filing volume.
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 signals
Reading filing volume, citation weight and recent-year momentum together points to a technology that is heavily claimed at the structural level but comparatively open in adhesion and formulation chemistry.
Growth has flattened, not reversed
The five-year run to 2021 pushed filings well above the 2017 baseline of 48, but the plateau through 2022 and the taper since suggests the core claim space in laminate structure and barrier chemistry is now largely occupied.
Structure is dense; adhesion is thin
Layered-product claims outnumber adhesive-chemistry claims by nearly seven to one, even though seal and interlayer adhesion failure is a recognised weak point in retort processing.
Influence is concentrated in older filings
The most-cited patent in this corpus is a laminate chemistry filing that predates the 2015–2026 window covered here, a reminder that citation leaders reflect accumulated time in the corpus rather than current filing activity.
Coverage is uneven across jurisdictions
Europe and the US carry the bulk of receiving-office volume, while India sits well behind — a gap worth checking before assuming durability claims are equally protected everywhere a product ships.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to retort pouch environmental durability, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Dow Global Technologies LLC | Rohm and Haas Company | 15 |
| Mitsui Chemicals, Inc. | Daicel Corporation | 7 |
| Dai Nippon Printing Co., Ltd. | NKK Corporation (Nippon Kokan K.K.) | 5 |
| Mitsui Chemicals, Inc. | Otsuka Pharmaceutical Factory, Inc. | 3 |
| Mitsui Chemicals, Inc. | Prime Polymer Co., Ltd. | 3 |
| Toppan Holdings Inc. | Blue Flag Co., Ltd. | 3 |
| Mitsui Chemicals, Inc. | Sumitomo Chemical Co., Ltd. | 2 |
| Mitsui Chemicals, Inc. | Mitsui Petrochemical Industries, Ltd. | 2 |
Only ten co-assignee pairs appear in the dataset, and the strongest of them accounts for just 15 shared filings — most retort durability patents are filed by a single assignee working alone.
Who is filing, and where the activity is slowing
Recent-year momentum across the leading assignees skews flat to negative, with several historically active filers showing zero filings or year-on-year declines in the most recent period — consistent with the broader plateau in overall filing volume.
Even active filers are pulling back
Assignees that were filing steadily in prior years show sharp year-on-year drops in the latest period, including one converter down 67% and several materials firms at zero filings, reinforcing the plateau visible in the aggregate trend.
Collaboration is the exception
Only ten co-assignee pairs appear across the full dataset, and the strongest — a pairing between a materials group and its chemicals affiliate — accounts for just 15 shared filings out of 1,589 families.
Europe and the US lead office volume
Europe (EPO) and the United States carry the largest receiving-office volumes, with Japan third; India and WIPO/PCT trail, marking jurisdictions where durability claims are comparatively less crowded.
| Assignee | Recent year | YoY |
|---|---|---|
| Toyobo Co., Ltd. | 1 | — |
| Toppan Holdings Inc. | 1 | -67% |
| Mitsui Chemicals, Inc. | 0 | — |
| Amcor Flexibles North America, Inc. | 0 | -100% |
| Dai Nippon Printing Co., Ltd. | 0 | -100% |
| Kuraray Co., Ltd. | 0 | — |
| Dow Global Technologies LLC | 0 | -100% |
| Mitsubishi Chemical Corporation | 0 | — |
Where to take this analysis
The aggregate trend and IPC breakdown answer the top-line question of where claim density sits; the next step is drilling into specific claim language and assignee portfolios before committing a filing strategy.
Check claim scope against the recycle-ready filing
US20230182457A1 stakes out mono-material polypropylene retort structures aimed at recycling streams — worth a full claim-chart comparison before designing a similar composition.
Open claim analysis in EurekaMap the adhesive and condensation-polymer white space
C09J and C08G carry the thinnest filing density in this dataset relative to their relevance to seal-integrity failure — a candidate area for a focused freedom-to-operate search.
Run a white-space search in EurekaTrack momentum among slowing filers
Several historically active assignees show flat or negative year-on-year filing in the latest period; watching whether that reverses is a useful signal for competitive timing.
Monitor assignee momentum in EurekaFrequently asked questions
Environmental durability claims in this dataset are tied specifically to survival under retort conditions — repeated exposure to heat, pressure and moisture during sterilisation — rather than to general shelf-life or gas-barrier performance alone. Typical claim language covers heat resistance, puncture resistance and retort durability measured through defined thermal cycles. The distinction matters commercially because a film can pass standard barrier testing and still delaminate or crack under retort processing, which is the failure mode these patents specifically target.
The assignee ranking behind this dataset shows a mix of long-established Japanese converters and materials firms alongside global packaging groups, with recent-year momentum skewing toward zero or negative growth for several historically active filers. The pattern is concentrated at the top with a long tail of single- or low-filing entrants rather than one dominant firm controlling the space. Co-assignee activity is limited to about ten pairs, indicating most filing happens independently rather than through joint development.
Filings peaked at 107 in 2021 and eased to 95 in 2022 before continuing to taper, a pattern more consistent with claim-space saturation in core laminate and barrier chemistry than with declining commercial interest. Publication lag also means the most recent year or two is understated in any filing count, since patents filed recently have not all published yet. Readers should treat the last two years of the trend as provisional rather than a confirmed slowdown.
Adhesive chemistry (C09J) and condensation-polymer chemistry (C08G) both carry filing counts well below the leading laminate and barrier-composition subclasses, despite adhesion and seal integrity being common retort-pouch failure points. This gap suggests durability claims framed around tie-layer bond retention after retort cycling, rather than composition alone, are comparatively open. Regional coverage also varies, with India's receiving-office volume notably behind Europe, the US and Japan.
The most-cited record, a perfluorocyclobutane-ring laminate patent with 168 citations, reflects influence built up over years inside this searched corpus and should be read as a signal of historical importance rather than current commercial control. Citation counts inside any fixed-date corpus structurally favour older filings simply because they have had more time to accumulate citations. Newer filings, including recycle-ready retort structures, show that active design work is still happening around and beyond that early laminate chemistry.
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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.