Pattern collapse happens when the receding liquid meniscus during a conventional wet-drying step exerts capillary force on high-aspect-ratio features, pulling them together or breaking them before drying finishes. It becomes more severe as feature aspect ratios increase, which is why it has drawn sustained patent activity across chemistry, hardware and process routes. In this corpus, claims addressing it sit heavily inside semiconductor-device (H01L) and photolithography (G03F) classes, reflecting how tightly the problem is bound to specific device fabrication steps rather than being a generic cleaning issue.

Supercritical carbon dioxide drying removes the liquid-vapour interface that causes capillary force in the first place, because the fluid transitions directly between liquid-like and gas-like states without crossing a phase boundary inside the features being dried. Marangoni drying and surface-tension-reduction chemistries take a different route, lowering the force at the interface rather than removing it. Both approaches appear as distinct claim families in this dataset, and chamber pressure control hardware is a recurring companion claim to the supercritical route specifically.

The assignee ranking behind this landscape covers 100 companies, with the leading assignee holding 351 of the 3,688 records in scope and a steep drop to 136 records by fifth place. That shape, a dominant leader followed by a long tail of smaller filers, is typical of a process technology that sits at the intersection of equipment, chemistry and device manufacturing. Company-level detail, including the specific assignees behind these figures, is available in the ranking table on this page.

Filing activity peaked at 276 records in 2018 and has since settled into a plateau, with complete-year data showing 182 records in 2021 and 173 in 2024, a -5% shift over that span. That is a mature but still active field rather than one in decline. The apparent drop-off after 2024 in the raw trend line is largely an artefact of publication lag, since patent publications typically trail filing by around 18 months, so 2025 and 2026 figures are still incomplete.

IPC class shares point to formulation-level claims, such as Marangoni surfactant chemistry and residue-after-drying detection, sitting well behind device- and process-level claims like H01L and G03F, each under 8% of records against 43.8% and 38.0% respectively. Chamber pressure ramp-rate control and CO2 drying cycle-time optimisation are also comparatively thin relative to the core prevention mechanisms. None of this guarantees freedom to operate on its own; it flags branches worth a targeted prior-art search before drafting a claim there.