Controlled Ice Nucleation Patents: Who Leads, Where the Gaps Are 2026
- Concentrated at the top. The top 5 of 34 ranked assignees hold 129 of 194 records in scope — 66.5% of the field — with the top 10 reaching 93.8%.
- Filing kept climbing through 2024. From 21 records in 2021 to 24 in 2024, a +14% rise over that span, before the expected 2025-2026 publication lag sets in.
- Drying dominates the IPC mix. F26B (drying) appears on 57.7% of records, well ahead of A01N (25.3%) and A61K (22.7%), pointing to process-hardware claims as the densest zone.
Filing growth compares 2021 (21 records) with 2024 (24) — 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 194 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Controlled ice nucleation addresses one of freeze drying’s oldest inconsistencies: uncontrolled, stochastic supercooling produces uneven ice crystal size across vials in the same batch, which in turn drives uneven pore structure, uneven drying rates and batch-to-batch variability. Patent activity in this space clusters around methods for triggering nucleation at a chosen temperature — pressure-differential dosing, depressurization, vacuum-induced surface freezing — and around the annealing and monitoring steps that confirm batch homogeneity once nucleation has been forced.
The 194 records in scope span 2015 through the partial 2026 cut-off, filed largely through United States, European, PCT, Indian, Canadian and German receiving offices. The mix of large-scale equipment makers, biologics manufacturers and academic assignees signals a technology that sits at the boundary of process engineering and formulation science.
Filing trend and technology composition
Two views of the same 194-record dataset: the year-by-year filing count, and the IPC subclasses those records carry.
Filing trend, 2017-2026
Filings rose from 19 in 2017 to a peak of 24 in 2024, including the +14% climb from 2021 to 2024. 2025 and 2026 show fewer published records, but that reflects the roughly 18-month lag between filing and publication rather than a genuine slowdown.
IPC subclass composition
F26B (drying) covers 57.7% of the 194 records, confirming that most claims sit on drying-chamber and process-control hardware rather than formulation chemistry. A01N and A61K each cover roughly a quarter of records, reflecting the biologics and agrochemical stabilization use cases that ride on the same nucleation-control methods. Because records can carry multiple IPC classes, these shares add up to more than 100%.
Shares are the percentage of the 194 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Controlled Ice Nucleation in Freeze Drying with Eureka
This page is one run against one query. Ask Eureka your own question about controlled ice nucleation in freeze drying and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited records
US20220397346A1 — Rapid depressurization controlled ice nucleation in pharmaceutical freeze-drying
A lyophilization method for lyophilizing products inside one or more vials within a lyophilization chamber, which includes humidifying a charge gas to a predetermined relative humidity, cooling shelves to a predetermined temperature, pressurizing the chamber with the humidified charge gas to a pressurization threshold, and suddenly releasing pressure until a depressurization threshold is reached in a short interval up to about 4 seconds, during which product inside the vials nucleates.Filed by Purdue Research Foundation, published 2022-12-15.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US11047620B2 | Freeze dryer and a method for inducing nucleation in products | 24 |
| 2 | GB2400901A | Method and apparatus for freeze drying material | 24 |
| 3 | WO2018005802A1 | Ice nucleation formulations for cryopreservation and stabilization of biologics | 17 |
| 4 | WO2004090446A1 | Method and apparatus for freeze drying material | 16 |
| 5 | US9435586B2 | Controlled nucleation during freezing step of freeze drying cycle using pressure differential ice crystals di… | 15 |
| 6 | WO2014091216A1 | Method of freezing making use of a mineral nucleator | 15 |
| 7 | WO2014028119A1 | Controlled nucleation during freezing step of freeze drying cycle using pressure differential ice crystals di… | 15 |
| 8 | US20140041250A1 | Controlled nucleation during freezing step of freeze drying cycle using pressure differential ice crystals di… | 15 |
| 9 | WO2011034980A1 | Freeze drying sysem | 15 |
| 10 | US8875413B2 | Controlled nucleation during freezing step of freeze drying cycle using pressure differential ice crystals di… | 14 |
Citation counts favour older filings inside this searched corpus; treat them as a signal of influence rather than of current commercial importance.
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Reading the concentration, trend and citation data together points to where claim space is occupied and where it is thin.
A small group of filers set the terms
With the top 5 of 34 ranked assignees holding 66.5% of all 194 records, and the top 10 reaching 93.8%, most of the remaining 24 ranked assignees hold only a handful of filings each. A new entrant is filing into a field where the core mechanical and process-control routes are already well staked out by a few names.
Activity climbed through the last complete year
Filings rose from 21 in 2021 to 24 in 2024, a +14% increase over that span and the field's peak year so far. 2025 and 2026 numbers look lower only because publication typically lags filing by about 18 months — those years are still filling in.
Drying hardware, not formulation, is the densest claim zone
F26B appears on well over half of the 194 records, ahead of A01N at 25.3% and A61K at 22.7%. Claims tied to chamber design, pressure control and shelf temperature sit on the thickest prior art; formulation-side claims under C07K (12.4%) and C12N (5.2%) are comparatively lighter.
The oldest mechanical patents still anchor the field
The most-cited records include freeze-dryer nucleation-inducing apparatus patents rather than recent formulation work, which is typical of citation counts inside a searched corpus — older filings accumulate references simply by being available longer, not necessarily by being more commercially relevant today.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to controlled ice nucleation in freeze drying, with the prior art for and against each one.
Who is filing, and where the field is still open
Equipment manufacturers, biologics companies and academic groups all show up in this dataset, but their filing patterns differ sharply.
Freeze-dryer OEMs hold the mechanical core
The leading assignee's 33 records concentrate on the physical mechanisms of nucleation control — pressure differential, vacuum-induced surface freezing, chamber design — the same territory covered by the most-cited patents in this dataset.
Large biologics filers protect process-formulation combinations
Biopharmaceutical assignees file fewer records than the leading equipment maker but combine nucleation-control methods with formulation and stabilization claims, visible in the A61K and C07K shares of the IPC mix.
University-industry pairs cluster around specific mechanisms
Co-assignee pairs, including one recurring university-industry pairing with 11 shared records, show that some of the more technical nucleation-triggering methods are being developed and filed jointly rather than by a single corporate lab.
| Assignee | Recent year | YoY |
|---|---|---|
| Millrock Technology Inc | 0 | — |
| Regeneron Pharmaceuticals Inc | 0 | — |
| Amgen Inc | 0 | -100% |
| The General Hospital Corporation | 0 | — |
| Linde AG | 0 | — |
| GEA Lyophil | 0 | — |
| SMARTFREEZ LDA | 0 | — |
| Asymptote | 0 | — |
Where to take this next
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, licensing or new filing strategy.
Check freedom-to-operate against the top 10
With 93.8% of the 194 records held by the top 10 of 34 ranked assignees, any new filing in pressure-differential or depressurization-based nucleation should be checked against that concentrated set before drafting claims.
Run a freedom-to-operate scanExplore the under-claimed annealing and monitoring branches
G01K temperature-measurement and B01F mixing-related classes each sit at 2.6% of records, well below the drying-hardware core, suggesting room for claims tied to real-time batch homogeneity monitoring.
Map the white spaceTrack the co-filing university-industry pattern
One recurring academic-industry pairing accounts for the strongest co-assignee link in this dataset, a useful signal for identifying active collaborative research worth watching or licensing from.
See collaboration patternsCommon questions on controlled ice nucleation patents
Controlled ice nucleation refers to methods that trigger the onset of ice formation in a freeze-drying vial at a chosen temperature, rather than letting it occur randomly through natural supercooling. Because uncontrolled nucleation produces variable ice crystal size and pore structure from vial to vial, it causes uneven drying rates and inconsistent batch homogeneity, which matters greatly for biologics and other sensitive formulations. Patent activity in this space covers both the physical triggering mechanisms, such as pressure differential and depressurization, and the downstream annealing and monitoring steps used to confirm consistency once nucleation is controlled.
The assignee ranking in this dataset covers 34 companies across 194 records, with the leading assignee holding 33 records on its own. The top 5 assignees together account for 66.5% of all records in scope, and the top 10 reach 93.8%, meaning most of the remaining ranked assignees hold only a small number of filings each. This is a field where a few equipment makers and large biologics manufacturers have built substantial portfolios while many other organisations hold single or few filings.
Filings rose from 21 records in 2021 to 24 in 2024, a +14% increase over that span, with 2024 the peak year in this dataset so far. Numbers for 2025 and 2026 appear lower, but that reflects the roughly 18-month lag between when a patent is filed and when it is published, not a genuine drop in filing activity. Treat 2024 as the most recent year that can be read reliably as a trend point.
US20220397346A1, filed by Purdue Research Foundation and published 2022-12-15, describes a rapid-depressurization method for inducing controlled ice nucleation during pharmaceutical freeze-drying. The method humidifies a charge gas to a target relative humidity, cools the drying shelves, pressurizes the chamber with that humidified gas, and then releases the pressure suddenly, within an interval of up to about 4 seconds, to trigger nucleation across the vials in the chamber. It sits within the same pressure-differential and depressurization family of techniques that dominate the most-cited records in this dataset, so anyone working on rapid-cycle nucleation triggering should review its claim scope directly.
Relative to the dense F26B drying-hardware claims that cover 57.7% of the 194 records, classes tied to in-process measurement and mixing are comparatively thin: G01K temperature measurement and B01F mixing and stirring each appear on only 2.6% of records. That suggests real-time monitoring of ice crystal size, supercooling degree sensing integrated directly into the nucleation trigger, and annealing-step optimisation tied to measured batch homogeneity are less crowded than the core mechanical triggering methods. These branches are worth a closer novelty search before assuming the space is occupied.
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