This dataset contains 5,844 published records filed or published between 2015 and mid-2026 that combine lyophilization or freeze-drying cycle language with process-control terms such as shelf temperature, chamber pressure and primary drying time. The true figure for the field overall could be somewhat different depending on search terms used, but this scope captures the core cycle-design activity rather than every patent that merely mentions a lyophilized product. Because publication lags filing by roughly 18 months, the 2025 and 2026 counts in this set are still incomplete.

One assignee leads clearly with 522 records, well ahead of fifth place at 122 and tenth place at 97. Even so, the top 5 assignees combined hold only 23.0% of all 5,844 records in scope, and the top 10 hold 31.6%, so ownership is led but far from consolidated. A full ranking covering 100 companies is needed to see the long tail of smaller filers that make up the bulk of the field.

Filings grew from 294 in 2017 to a peak of 313 in 2019, then declined to 233 in 2021 and 98 by 2024 — a -58% drop over that three-year span, which is the last period the dataset treats as complete. This looks like a genuine cooling after a filing peak rather than a data artifact, though later years may revise upward slightly as publication catches up. Anyone assessing the field today should weight the 2024 figure over 2025 or 2026 counts.

Medicinal preparations (IPC class A61K) appear in 83.1% of the 5,844 records, and peptide and protein chemistry (C07K) in 29.7%, showing the field is driven heavily by biologic formulation work. Dedicated drying engineering (F26B) appears in only 5.2% of records and sterilising/disinfecting (A61L) in 3.8%, both comparatively under-claimed relative to the formulation-heavy classes. Since a single record can carry multiple IPC classes, these percentages add to more than 100% and should be read as overlapping coverage, not a strict breakdown.

The thinner IPC classes relative to A61K and C07K point toward drying-chamber instrumentation, sublimation-rate sensing methods and automated cycle-robustness testing as comparatively under-claimed areas. Only 10 co-assignee pairs appear across the dataset, suggesting little cross-company collaboration and room for standalone filings that combine process instrumentation with cycle-robustness claims. Any freedom-to-operate work should still check the long tail of smaller assignees, since the ranked leaders hold well under a third of all records between them.