C09K 8/584
Characterised by the use of specific surfactants
Official title: characterised by the use of specific surfactants
C09K8/584 (Characterised by the use of specific surfactants) appears on 1,252 US grants and 1,102 published applications in this corpus.
Search patents in C09K- Granted patents
- 1,252
- Published applications
- 1,102
- Assignees
- 349
- Inventors
- 2,239
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 22 | 0 |
| 1977 | 20 | 0 |
| 1978 | 33 | 0 |
| 1979 | 17 | 0 |
| 1980 | 32 | 0 |
| 1981 | 33 | 0 |
| 1982 | 14 | 0 |
| 1983 | 14 | 0 |
| 1984 | 51 | 0 |
| 1985 | 52 | 0 |
| 1986 | 16 | 0 |
| 1987 | 18 | 0 |
| 1988 | 20 | 0 |
| 1989 | 27 | 0 |
| 1990 | 15 | 0 |
| 1991 | 13 | 0 |
| 1992 | 13 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 1 | 1 |
| 2002 | 0 | 0 |
| 2003 | 1 | 3 |
| 2004 | 3 | 5 |
| 2005 | 1 | 4 |
| 2006 | 3 | 13 |
| 2007 | 8 | 12 |
| 2008 | 6 | 18 |
| 2009 | 5 | 29 |
| 2010 | 16 | 20 |
| 2011 | 13 | 47 |
| 2012 | 16 | 22 |
| 2013 | 19 | 46 |
| 2014 | 25 | 64 |
| 2015 | 34 | 58 |
| 2016 | 30 | 78 |
| 2017 | 50 | 67 |
| 2018 | 57 | 71 |
| 2019 | 62 | 75 |
| 2020 | 75 | 95 |
| 2021 | 72 | 80 |
| 2022 | 74 | 90 |
| 2023 | 87 | 75 |
| 2024 | 78 | 46 |
| 2025 | 58 | 53 |
| 2026 | 29 | 30 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for coal seam gas seepage displacement, seepage water locking and dust reduction22 Sep 2026US 12,742,389 B2Hunan University of Science and Technology
- Apparatus and method for CO2 microbubble flooding15 Sep 2026US 12,734,490 B2Dalian University of Technology
- Surface-modified nanoparticle compositions and related applications in subterranean hydrocarbon recovery15 Sep 2026US 12,735,626 B2
- Viscoelastic surfactant formulations and use in subterranean formations11 Aug 2026US 12,703,821 B2Energy Solutions (US) LLC
- Compositions and methods for breaking foams and emulsions11 Aug 2026US 12,703,822 B2Chevron U.S.A.Inc.
- Formation Maintenance Fluids with Flowback Enhancers to Improve Wellbore Operations8 Oct 2026US 2026/0308442 A1Baker Hughes Oilfield Operations LLC
- Surface active organic alkali agents1 Oct 2026US 2026/0297420 A1Ultimate Eor Services LLC
- Carbonate reaction products of alkyl glycosides and methods for use thereof24 Sep 2026US 2026/0286212 A1Saudi Arabian Oil Company
- Conventional chemical eor application without salinity gradient24 Sep 2026US 2026/0286817 A1Chevron U.S.A.Inc.
- Lignin-based compositions and related methods10 Sep 2026US 2026/0265600 A1LignoSol IP Limited
Most cited
By later US patents
- Surfactant oil recovery process usable in high temperature, high salinity formations177US 4,077,471 ATexaco Inc. · 1978
- Alkaline surfactant polymer flooding composition and process153US 6,022,834 AOil Chem Technologies · 2000
- Methods for dewatering shaly subterranean formations140US 6,660,693 B2Schlumberger Technology Corporation · 2003
- Oil recovery method for waxy crude oil using alkylaryl sulfonate surfactants derived from alpha-olefins and the alpha-olefin compositions134US 6,269,881 B1Chevron Chemical Company · 2001
- Heat-stable calcium-compatible waterflood surfactant130US 3,943,160 AShell Oil Company · 1976