C09K 2208/28
Friction or drag reducing additives
C09K2208/28 (Friction or drag reducing additives) appears on 491 US grants and 687 published applications in this corpus.
Search patents in C09K- Granted patents
- 491
- Published applications
- 687
- Assignees
- 201
- Inventors
- 1,139
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 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 | 4 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 3 |
| 2007 | 5 | 2 |
| 2008 | 1 | 7 |
| 2009 | 4 | 9 |
| 2010 | 9 | 13 |
| 2011 | 6 | 13 |
| 2012 | 4 | 25 |
| 2013 | 15 | 22 |
| 2014 | 14 | 31 |
| 2015 | 19 | 44 |
| 2016 | 16 | 49 |
| 2017 | 29 | 55 |
| 2018 | 45 | 37 |
| 2019 | 25 | 46 |
| 2020 | 33 | 58 |
| 2021 | 52 | 68 |
| 2022 | 65 | 50 |
| 2023 | 57 | 43 |
| 2024 | 35 | 49 |
| 2025 | 38 | 35 |
| 2026 | 13 | 24 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Subterranean formations14 Jul 2026US 12,680,015 B2Independence Oilfield Chemicals LLC
- Injection fluids for stimulating fractured formations12 May 2026US 12,624,277 B2Chevron U.S.A.Inc.
- Friction reduction of acidic treatment fluids5 May 2026US 12,618,000 B2Halliburton Energy Services.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
- Wellbore drilling compositions1 Oct 2026US 2026/0297413 A1Chevron Phillips Chemical Company LP
- Subterranean formations24 Sep 2026US 2026/0286215 A1Independence Oilfield Chemicals LLC
- Nanomaterial-containing friction reducer for water-based drilling fluid, and preparation method therefor13 Aug 2026US 2026/0234460 A1China University of Petroleum (East China)
- Low viscosity polymer-based retarded acid13 Aug 2026US 2026/0234466 A1Schlumberger Technology Corporation
- Low interfacial tension injection fluid for treating subterranean formation6 Aug 2026US 2026/0226812 A1Chevron U.S.A.Inc.
Most cited
By later US patents
- Water-dispersible hydrophobic thickening agent122US 4,432,881 AThe Dow Chemical Company · 1984
- Composition for denaturing and breaking down friction-reducing polymer and for destroying other gas and oil well contaminants71US 7,897,063 B12011
- Drag-reducing copolymer compositions64US 8,865,632 B1CESI Chemical, Inc. · 2014
- Use of dispersion polymers as friction reducers in aqueous fracturing fluids62US 6,787,506 B2Nalco Energy Services, L.P. · 2004
- Friction reducing composition and method60US 7,205,262 B2Weatherford/Lamb, Inc. · 2007