C09K 8/36
Water-in-oil emulsions
C09K8/36 (Water-in-oil emulsions) appears on 588 US grants and 636 published applications in this corpus.
Search patents in C09K- Granted patents
- 588
- Published applications
- 636
- Assignees
- 190
- Inventors
- 979
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 11 | 0 |
| 1985 | 7 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 6 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 4 | 0 |
| 1994 | 9 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 5 | 0 |
| 1998 | 3 | 0 |
| 1999 | 8 | 0 |
| 2000 | 9 | 0 |
| 2001 | 7 | 4 |
| 2002 | 5 | 4 |
| 2003 | 7 | 17 |
| 2004 | 8 | 22 |
| 2005 | 7 | 23 |
| 2006 | 9 | 9 |
| 2007 | 14 | 31 |
| 2008 | 12 | 21 |
| 2009 | 17 | 10 |
| 2010 | 23 | 26 |
| 2011 | 18 | 21 |
| 2012 | 17 | 27 |
| 2013 | 12 | 23 |
| 2014 | 14 | 35 |
| 2015 | 15 | 31 |
| 2016 | 13 | 23 |
| 2017 | 24 | 44 |
| 2018 | 24 | 56 |
| 2019 | 45 | 57 |
| 2020 | 60 | 45 |
| 2021 | 47 | 27 |
| 2022 | 38 | 18 |
| 2023 | 24 | 25 |
| 2024 | 16 | 11 |
| 2025 | 20 | 13 |
| 2026 | 6 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Manufacturing method for inverse emulsion polymer2 Jun 2026US 12,643,961 B2TouGas Holding GmbH
- Method of drilling wellbore into subterranean geological formation26 May 2026US 12,637,606 B1King Fahd University of Petroleum and Minerals
- Pourable wetting agents and methods associated therewith12 May 2026US 12,624,272 B2Saudi Arabian Oil Company
- Low density oil-based wellbore fluids and methods thereof7 Apr 2026US 12,595,404 B2Schlumberger Technology Corporation
- Polyhedral oligomeric silsesquioxane as rheology booster for invert emulsion oil-based mud10 Mar 2026US 12,570,888 B2Saudi Arabian Oil Company
- Drilling mud and method of making drilling mud having an unrefined petroleum product8 Oct 2026US 2026/0308439 A14 Oaks Solutions LLC
- Emulsifier and preparation method therefor, and oil-based drilling fluid1 Oct 2026US 2026/0297414 A1China Petroleum & Chemical Corporation
- Emulsifiers, drilling fluids, and methods of making and using the same24 Sep 2026US 2026/0286207 A1
- Method of using inverse emulsion polymer17 Sep 2026US 2026/0275003 A1TouGas Holding GmbH
- Pourable wetting agents and methods associated therewith13 Aug 2026US 2026/0234462 A1Aramco Americas Company
Most cited
By later US patents
- Polymeric compositions and methods of using them130US 4,670,501 AAllied Colloids Limited · 1987
- Composition and process for well cleaning112US 7,380,606 B2CESI Chemical, a Flotek Company · 2008
- Gravel packing method111US 6,883,608 B2Schlumberger Technology Corporation · 2005
- Microemulsions to convert OBM filter cakes to WBM filter cakes having filtration control111US 7,709,421 B2Baker Hughes Incorporated · 2010
- Oil based synthetic hydrocarbon drilling fluid100US 5,189,012 AM-I Drilling Fluids Company · 1993