Microwave Thermal Processing Patents: Who Leads, Gaps 2026
- One assignee dominates the ranked leaders, holding 10 records against a long tail where the fifth-ranked company holds only 3 and the tenth holds 1.
- Food chemistry and heating hardware are claimed almost equally, with A23L food composition on 56.8% of the 37 records and H05B heating circuitry on 43.2% — this is a hardware-and-formulation fight, not one or the other.
- Filing has not grown steadily since 2017, peaking at 4 records in 2022 with no clear upward trend since, and 2026 figures are still incomplete due to publication lag.
What this landscape covers
Microwave-assisted thermal processing sits at the intersection of food science and RF/microwave engineering: sterilizing or pasteurizing packaged food using microwave energy while keeping the temperature field uniform enough to avoid cold spots and packaging failure. The scope here is drawn from records that combine microwave sterilization or food processing language with terms tied to field uniformity, hot-spot mapping, dielectric properties, package materials, process validation or throughput scaling — the practical problems that separate a lab demonstration from a commercial retort line.
The dataset covers 37 published records filed between 2015 and mid-2026. Publication lag of roughly 18 months means the most recent year understates real filing activity, so read the 2025-2026 tail as provisional rather than a genuine slowdown.
Filing trend and technology composition
Two views of the same 37 records: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend, 2017-2026
Filings rose from 3 records in 2017 to a peak of 4 in 2022, with no sustained upward trajectory since. Because the corpus is small, single-year swings of one or two records look larger than they are; treat the shape as flat-to-modest rather than a growth curve. The 2026 count is partial and will rise as later filings publish.
Technology composition by IPC subclass
A23L (foods and non-alcoholic beverages) appears on 56.8% of the 37 records and H05B (electric heating and lighting circuits) on 43.2%, confirming that claims split between the food formulation and the RF heating hardware rather than clustering in one discipline. B65D packaging claims appear on 29.7% of records and F24C stove/range hardware on 24.3%. Because records can carry multiple IPC codes, these shares sum to more than 100% and should not be added together.
Shares are the percentage of the 37 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Microwave-Assisted Thermal Processing with Eureka
This page is one run against one query. Ask Eureka your own question about microwave-assisted thermal processing and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a recent filing
Dual-frequency microwave antenna and solid-state drying/heating apparatus
The application claims an antenna that emits microwave radiation across two frequency bands, roughly 400-500 MHz and 2.4-2.5 GHz, from a cylindrical body transitioning into a frustoconical section, with dimensional tolerances specified as percentage ranges around fixed millimetre targets.Filed by Mildtech UK Ltd, published 2025-06-05 — one of the most recent records in scope.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4851631A | Food container for microwave heating and method of substantially eliminating arching in a microwave food cont… | 38 |
| 2 | US4934829A | Method of determining resonant lengths of microwave shielding material | 19 |
| 3 | US20170245528A1 | A Microwave Retort System, A Process For Heating Food Products Using A Microwave Retort System, And Food Prod… | 17 |
| 4 | WO2016044571A1 | A microwave retort system, a process for heating food products using a microwave retort system, and food prod… | 11 |
| 5 | CA2961408A1 | A microwave retort system, a process for heating food products using a microwave retort system, and food prod… | 9 |
| 6 | US20170311634A1 | Microwave retort system, a process for heating food products using a microwave retort system, and food produc… | 6 |
| 7 | WO1988003352A1 | Food container and method of manufacturing | 4 |
| 8 | GB2615764A | Solid state dual-frequency microwave drying and heating apparatus within a vacuum environment using nir analy… | 2 |
| 9 | IN201717011501A | A microwave retort system a process for heating food products using a microwave retort system and food produc… | 1 |
Citation counts favour older filings that have had more time to accumulate citations within this searched corpus; treat them as a signal of influence on the field rather than of current commercial relevance.
Publication numbers are shown where the record carries one (9 of 9 rows); clicking a row searches Eureka by that number.
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Browse MCP servers →What the data means for a filing decision
Three read-throughs from the citation, class and assignee data that matter for anyone deciding where to file next.
Early container and shielding patents still anchor the field
The most-cited record, a food container design for eliminating arching during microwave heating, sits far ahead of the next-most-cited record on shielding-material resonant lengths. Both address basic physical problems — arcing and field containment — that any new entrant into packaged microwave sterilization still has to solve.
Food chemistry claims and heating hardware claims run in parallel
A23L food-composition claims and H05B heating-circuit claims each cover a large share of the corpus without one dominating the other. A team building a retort system needs clearance searches on both fronts — the food matrix and the RF delivery hardware — rather than assuming one discipline covers the risk.
One filer sits well ahead of a thin tail
The top-ranked assignee holds 10 records in a ranking where the fifth-place company holds only 3 and the tenth holds 1. That gap suggests one organisation has built a sustained filing programme while most other participants have filed only occasionally.
Packaging claims are a real but secondary front
Nearly three in ten records touch B65D container and packaging classification, which matters because package material choice directly affects field uniformity and hot-spot behaviour during microwave sterilization. This is a smaller claim surface than food composition or heating circuitry but not one to skip in a clearance review.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to microwave-assisted thermal processing, with the prior art for and against each one.
Who is filing, and where the field is thin
The ranked leaders show a steep drop after the top filer, and recent-year momentum data show no assignee — including the leader — with active filings in the latest tracked year, consistent with publication lag rather than a genuine pullback.
A sustained filing programme, not a one-off
The top assignee's 10 records, against a fifth-place count of 3 and a tenth-place count of 1, point to a company that has treated microwave retort processing as a long-running R&D line rather than a single patent family.
Most participants file once and stop
Several assignees in the ranking sit at or near the bottom with a single record, a pattern typical of packaging suppliers, retort equipment makers and food companies testing a specific claim rather than building a portfolio.
No visible recent-year activity — read this against publication lag
None of the tracked assignees show filings in the latest year, including the leader. Given the roughly 18-month gap between filing and publication, this reflects the data window rather than the field going quiet.
| Assignee | Recent year | YoY |
|---|---|---|
| The Pillsbury Company | 0 | — |
| Kraft Foods Group Brands LLC | 0 | — |
| 915 Labs LLC | 0 | — |
| FRESHSEAL LTD | 0 | — |
| Amcor Flexibles North America Inc | 0 | — |
| TATA SMARTFOODZ LTD | 0 | — |
| MILDTECH UK LTD | 0 | — |
| WENDT DAN J | 0 | — |
Where to take this
The public record shows where claim density sits and where it thins out. Turning that into a filing or clearance decision means going deeper on the specific claims and the specific assignees involved.
Run a freedom-to-operate check on the leader's portfolio
With one assignee holding 10 of the ranked records, any new retort system or packaging design should be checked against that portfolio's specific claim language before development goes further.
Explore assignee portfolios in EurekaMap the dual-frequency antenna claim in detail
The most recent representative filing claims specific dimensional tolerances on a dual-frequency antenna design; understanding exactly which geometries fall inside those ranges matters for anyone designing heating hardware.
Analyze claim scope in EurekaTrack the packaging-dielectric intersection
B65D packaging claims appear on under a third of records, which is thin relative to the food and heating claim density — a candidate area for a first-mover filing if the underlying dielectric work is solid.
Search white space in EurekaCommon questions on this landscape
Within this dataset of 37 records, one assignee leads the ranking with 10 records, well ahead of the fifth-ranked company at 3 and the tenth-ranked at 1. That gap indicates a concentrated filing programme at the top rather than even competition across the ranked leaders. It is worth noting this ranking covers only the 10 companies the dataset returns, not every company that has ever filed in the space, so treat it as a view into the most active filers rather than an exhaustive list.
The claims split mainly between food composition and formulation (IPC class A23L, on 56.8% of the 37 records) and electric heating circuitry (H05B, on 43.2%), with packaging (B65D, 29.7%) and domestic heating hardware (F24C, 24.3%) as secondary but non-trivial fronts. Because a single patent can carry multiple IPC codes, these percentages overlap and should not be summed. In practice this means a clearance search needs to cover both the food matrix and the RF delivery hardware, not just one side.
The data shows filings moving from 3 records in 2017 to a peak of 4 in 2022, without a sustained upward trend across the tracked years. There are too few complete years once publication lag is accounted for to state a reliable growth rate. The 2025-2026 figures are especially incomplete, since patents typically publish around 18 months after filing, so recent-year counts will rise as later filings become public.
That application, filed by Mildtech UK Ltd and published mid-2025, claims a dual-frequency microwave antenna operating in two specified frequency bands with a cylindrical-to-frustoconical body whose dimensions are defined as percentage tolerance ranges around fixed millimetre targets. It blocks antenna designs that fall inside those specific frequency and dimensional ranges, not microwave heating generally. Anyone designing heating hardware in this space should check their antenna geometry and frequency plan against those specific ranges rather than assuming the whole dual-frequency concept is closed off.
Relative to the dense food-composition and heating-circuit claim space, packaging-dielectric compatibility, hot-spot mapping sensor integration, and continuous-line throughput scaling show thinner coverage in this dataset. These are areas where the underlying engineering problem is well recognised in the field but has not attracted the same density of claims as core food formulation or heating hardware. A first filing there would need to tie a specific sensor, material or line-speed claim to the microwave sterilization context rather than claiming the general problem.
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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.