Silicone Antifoam Patents: Top Companies & Filing Trends 2026
Silicone Antifoam and Defoamer Emulsion Patents: Where Filing Concentrates and Where It Doesn't
48.2% sits with five filers. The top five assignees combined hold 919 of the 1,905 records in scope — concentration at the top, with a long tail behind them. Annual filings rose to a peak of 65 records in 2021, then declined to 37 by 2024 — a 43% drop over that span. 2025 and 2026 figures are still filling in under normal publication lag and should not be read as a continued decline.
- 1PROCTER & GAMBLE CO541
- 2DOW SILICONES CORP180
- 3DOW CORNING SA94
- 4SYNGENTA PARTICIPATIONS AG63
- 5ECOLAB USA INC41
See the full silicone antifoam and defoamer emulsions analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on this landscape
Who holds the most patents in silicone antifoam and defoamer emulsions?
One assignee leads clearly with 541 of the 1,905 records in scope, far ahead of the rest of the field — fifth place holds 41 records and tenth place 32. The top five assignees combined account for 48.2% of all records, so the field is concentrated at the top with a long tail of 100 ranked companies filing far less. Anyone entering this space should expect dense prior art around the leader’s core claim territory, particularly in dispersible-emulsion and detergent-antifoam formulations.
Is silicone antifoam patent filing growing or slowing down?
Filing peaked at 65 records in 2021 and had fallen to 37 by 2024, a 43% decline over that three-year span. However, because patent publication typically lags actual filing by around 18 months, the 2025 and 2026 figures in this dataset are still incomplete and should not be read as continued decline. The honest read is that a filing wave crested in 2021 and has since cooled, at least through the last fully complete year of data.
What are the main technology areas covered by these patents?
Detergent and cleaning compositions (IPC class C11D) dominate, appearing in 50.7% of the 1,905 records in scope. Separation processes such as filtration (B01D) follow at 22.7%, and agrochemical-related classes (A01N biocides and A01P pesticide activity) account for 16.3% and 6.8% respectively, showing the chemistry’s reach into crop protection. Coatings (C09D) and polymer additive classes (C08L, C08K) round out the remaining application areas, and because records often carry multiple classes these shares add up to well over 100%.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Silicone Antifoam and Defoamer Emulsions covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.