C09K 8/94
Foams
C09K8/94 (Foams) appears on 252 US grants and 234 published applications in this corpus.
Search patents in C09K- Granted patents
- 252
- Published applications
- 234
- Assignees
- 107
- Inventors
- 603
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 7 | 0 |
| 1992 | 9 | 0 |
| 1993 | 10 | 0 |
| 1994 | 11 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 0 |
| 2002 | 2 | 1 |
| 2003 | 2 | 3 |
| 2004 | 2 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 7 |
| 2007 | 0 | 5 |
| 2008 | 2 | 7 |
| 2009 | 4 | 2 |
| 2010 | 6 | 4 |
| 2011 | 3 | 11 |
| 2012 | 3 | 8 |
| 2013 | 5 | 10 |
| 2014 | 5 | 6 |
| 2015 | 5 | 12 |
| 2016 | 1 | 15 |
| 2017 | 10 | 15 |
| 2018 | 9 | 18 |
| 2019 | 16 | 14 |
| 2020 | 22 | 18 |
| 2021 | 15 | 20 |
| 2022 | 15 | 15 |
| 2023 | 18 | 13 |
| 2024 | 10 | 12 |
| 2025 | 7 | 11 |
| 2026 | 5 | 7 |
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
- Compositions and methods for foam stimulation23 Jun 2026US 12,662,623 B2Chevron U.S.A.Inc.
- Compositions and methods for pressure protection2 Jun 2026US 12,644,043 B2Chevron U.S.A.Inc.
- Gemini surfactant as foaming agent for foam drilling28 Apr 2026US 12,612,543 B2King Fahd University of Petroleum and Minerals
- Method of enhancing foam stability for stimulation of low pressure reservoirs24 Feb 2026US 12,560,063 B2
- Methods, systems, and compositions for in-situ foam generation for liquid unloading23 Jul 2026US 2026/0209595 A1Saudi Arabian Oil Company
- Materials and methods to enhance mineral scale dissolution rates11 Jun 2026US 2026/0159749 A1Swellfix UK Limited
- High-temperature foam fracturing fluid with synthetic polymer14 May 2026US 2026/0132330 A1Schlumberger Technology Corporation
- Method for coal seam gas seepage displacement, seepage water locking and dust reduction23 Apr 2026US 2026/0110250 A1Hunan University of Science and Technology
- Synergistic effects of nanoparticles and surfactants for water injectivity improvement19 Mar 2026US 2026/0078295 A1ChampionX LLC
Most cited
By later US patents
- Hydrocarbon-based fracturing fluid composition, system, and method174US 9,850,422 B2ProStim Labs, LLC · 2017
- Methods for stimulating hydrocarbon production156US 6,828,280 B2Schlumberger Technology Corporation · 2004
- Methods for dewatering shaly subterranean formations140US 6,660,693 B2Schlumberger Technology Corporation · 2003
- Gas well treatment compositions and methods135US 5,310,002 AHalliburton Company · 1994
- Pre-treatment methods for polymer-containing fluids129US 6,138,760 ABJ Services Company · 2000