C09K 8/604
Polymeric surfactants
Official title: {Polymeric surfactants}
C09K8/604 (Polymeric surfactants) appears on 158 US grants and 207 published applications in this corpus.
Search patents in C09K- Granted patents
- 158
- Published applications
- 207
- Assignees
- 89
- Inventors
- 381
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 4 |
| 2007 | 1 | 1 |
| 2008 | 0 | 4 |
| 2009 | 3 | 2 |
| 2010 | 4 | 9 |
| 2011 | 3 | 7 |
| 2012 | 2 | 6 |
| 2013 | 3 | 5 |
| 2014 | 10 | 11 |
| 2015 | 7 | 10 |
| 2016 | 5 | 10 |
| 2017 | 5 | 7 |
| 2018 | 7 | 11 |
| 2019 | 5 | 17 |
| 2020 | 10 | 19 |
| 2021 | 16 | 19 |
| 2022 | 15 | 15 |
| 2023 | 27 | 19 |
| 2024 | 13 | 16 |
| 2025 | 10 | 5 |
| 2026 | 7 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Combination of polyglycerol-10 laurate and an alcohol to reverse the rock wettability of a reservoir4 Aug 2026US 12,698,434 B1Oleon NV
- Multi-functional compositions for enhanced oil and gas recovery and other petroleum industry applications7 Jul 2026US 12,674,087 B2Locus Solutions Ipco, LLC
- Injection fluids for stimulating fractured formations12 May 2026US 12,624,277 B2Chevron U.S.A.Inc.
- Low viscosity polymer-based retarded acid14 Apr 2026US 12,600,901 B2Schlumberger Technology Corporation
- Liquid chloride salt-based polymer suspension fluids with polyethylene glycol dispersants and application to drag reduction7 Apr 2026US 12,595,406 B2Psmg, LLC
- Method for modifying the permeability of a subterranean formation and related treatment fluid used in said method20 Aug 2026US 2026/0242657 A1ENI S. p. A.
- Low viscosity polymer-based retarded acid13 Aug 2026US 2026/0234466 A1Schlumberger Technology Corporation
- Water-lock releasing chemical agent for oil and gas reservoirs, preparation method therefor and use thereof6 Aug 2026US 2026/0226342 A1China Petroleum & Chemical Corporation
- Brine-tolerant compositions comprising fatty acid or fatty ester reaction products of saccharide polymers21 May 2026US 2026/0139184 A1Integrity Bio-Chemicals, LLC
- Injection fluids comprising an anionic surfactant for treating unconventional formations9 Apr 2026US 2026/0098204 A1Chevron U.S.A.Inc.
Most cited
By later US patents
- Composition and method for fluid recovery from well95US 7,893,010 B2Schlumberger Technology Corporation · 2011
- Drag-reducing copolymer compositions64US 8,865,632 B1CESI Chemical, Inc. · 2014
- Liquid crystals for drilling, completion and production fluids50US 8,356,667 B2Baker Hughes Incorporated · 2013
- Fluorinated surfactants and methods of using the same32US 8,176,981 B23M Innovative Properties Company · 2012
- Siloxane surfactant additives for oil and gas applications31US 10,053,619 B2Flotek Chemistry, LLC · 2018