C09K 8/76
For preventing or reducing fluid loss
Official title: for preventing or reducing fluid loss
C09K8/76 (For preventing or reducing fluid loss) appears on 124 US grants and 113 published applications in this corpus.
Search patents in C09K- Granted patents
- 124
- Published applications
- 113
- Assignees
- 39
- Inventors
- 262
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 6 | 0 |
| 1979 | 4 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 6 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 3 |
| 2006 | 2 | 2 |
| 2007 | 2 | 4 |
| 2008 | 3 | 5 |
| 2009 | 0 | 4 |
| 2010 | 7 | 5 |
| 2011 | 0 | 5 |
| 2012 | 2 | 6 |
| 2013 | 5 | 3 |
| 2014 | 5 | 11 |
| 2015 | 4 | 4 |
| 2016 | 3 | 13 |
| 2017 | 7 | 6 |
| 2018 | 14 | 6 |
| 2019 | 2 | 7 |
| 2020 | 5 | 6 |
| 2021 | 7 | 10 |
| 2022 | 8 | 1 |
| 2023 | 4 | 0 |
| 2024 | 1 | 3 |
| 2025 | 2 | 7 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Viscoelastic surfactant formulations and use in subterranean formations11 Aug 2026US 12,703,821 B2Energy Solutions (US) LLC
- Methods for sealing high-permeability zones in subterranean formations28 Jul 2026US 12,692,430 B1Saudi Arabian Oil Company
- Single-phase retarded acid based on a cationic surfactant18 Nov 2025US 12,473,486 B2Schlumberger Technology Corporation
- Ferrate(VI)-based hydraulic fracturing fluid for carbon dioxide sequestration and methods related thereto11 Mar 2025US 12,247,163 B2Saudi Arabian Oil Company
- Salt of monochloroacetic acid with chelating agent for delayed acidification in the oil field industry23 Jan 2024US 11,879,096 B2Nouryon Chemicals International B. V.
- Single-phase retarded acid based on a cationic surfactant12 Mar 2026US 2026/0071114 A1Schlumberger Technology Corporation
- Gelled acid compositions and methods for acid stimulation in carbonate formations16 Oct 2025US 2025/0320405 A1King Fahd University of Petroleum and Minerals
- Ferrate(vi)-based hydraulic fracturing fluid for carbon dioxide sequestration and methods related thereto31 Jul 2025US 2025/0243400 A1Saudi Arabian Oil Company
- Materials and compositions for reservoir stimulation treatment22 May 2025US 2025/0163315 A1Swellfix UK Limited
- Method to enhance well completion through optimized fracture diversion1 May 2025US 2025/0137366 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Well treatment fluids and methods for the use thereof112US 6,509,301 B12003
- Degradable material assisted diversion or isolation102US 7,380,600 B2Schlumberger Technology Corporation · 2008
- Method of acidizing wells84US 3,998,272 AUnion Oil Company of California · 1976
- Method of preparing and using acidizing and fracturing compositions, and fluid loss additives for use therein67US 4,107,057 AHalliburton Company · 1978
- Liquid gel concentrates and methods of using the same62US 4,336,145 AHalliburton Company · 1982