C09K 8/26
Oil-in-water emulsions
C09K8/26 (Oil-in-water emulsions) appears on 269 US grants and 271 published applications in this corpus.
Search patents in C09K- Granted patents
- 269
- Published applications
- 271
- Assignees
- 120
- Inventors
- 531
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 8 | 0 |
| 1998 | 8 | 0 |
| 1999 | 7 | 0 |
| 2000 | 6 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 1 |
| 2003 | 3 | 10 |
| 2004 | 5 | 7 |
| 2005 | 1 | 7 |
| 2006 | 7 | 7 |
| 2007 | 3 | 11 |
| 2008 | 4 | 7 |
| 2009 | 6 | 7 |
| 2010 | 6 | 16 |
| 2011 | 13 | 11 |
| 2012 | 10 | 12 |
| 2013 | 6 | 9 |
| 2014 | 10 | 12 |
| 2015 | 6 | 13 |
| 2016 | 9 | 9 |
| 2017 | 4 | 9 |
| 2018 | 9 | 29 |
| 2019 | 17 | 16 |
| 2020 | 23 | 21 |
| 2021 | 23 | 17 |
| 2022 | 15 | 11 |
| 2023 | 11 | 12 |
| 2024 | 8 | 4 |
| 2025 | 6 | 6 |
| 2026 | 1 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Lignin-based drilling fluids and related methods14 Apr 2026US 12,600,894 B2LignoSol IP Limited
- Wellbore servicing compositions containing a latex additive23 Dec 2025US 12,503,634 B2Halliburton Energy Services.Inc.
- Magnetic nanoemulsions for fluid conductivity analysis in subsurface reservoirs2 Dec 2025US 12,486,763 B2PERM Inc.
- Polymeric amidoamine emulsifiers22 Jul 2025US 12,365,824 B2Schlumberger Technology Corporation
- Surfactant package for direct emulsion drilling fluid15 Jul 2025US 12,359,109 B2Schlumberger Technology Corporation
- Wellbore drilling compositions1 Oct 2026US 2026/0297413 A1Chevron Phillips Chemical Company LP
- Composite emulsifier and oil-based drilling fluid13 Aug 2026US 2026/0234461 A1China Petroleum & Chemical Corporation
- Drilling fluids16 Jul 2026US 2026/0201238 A1Lamberti SPA
- Emulsions that include pyridinium-based compounds and uses thereof9 Jul 2026US 2026/0193512 A1Saudi Arabian Oil Company
- Wellbore servicing compositions containing a latex additive12 Mar 2026US 2026/0071111 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Composition and process for well cleaning112US 7,380,606 B2CESI Chemical, a Flotek Company · 2008
- Oil based synthetic hydrocarbon drilling fluid100US 5,189,012 AM-I Drilling Fluids Company · 1993
- Conversion of emulsion mud to cement91US 5,358,049 AShell Oil Company · 1994
- Process for the facilitated waste disposal of working substances based on water-in-oil invert emulsions91US 6,165,946 AHenkel Kommanditgesellschaft auf Aktien · 2000
- Compositions containing combinations of surfactants and derivatives of succinic acylating agent or hydroxyaromatic compounds and methods of using the same89US 5,330,662 AThe Lubrizol Corporation · 1994