C09K 8/92
Characterised by their form or by the form of their components
Official title: characterised by their form or by the form of their components, e.g. encapsulated material (C09K8/70 takes precedence)
C09K8/92 (Characterised by their form or by the form of their components) appears on 666 US grants and 731 published applications in this corpus.
Search patents in C09K- Granted patents
- 666
- Published applications
- 731
- Assignees
- 243
- Inventors
- 1,470
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 5 | 0 |
| 1985 | 6 | 0 |
| 1986 | 4 | 0 |
| 1987 | 9 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 8 | 0 |
| 1991 | 10 | 0 |
| 1992 | 14 | 0 |
| 1993 | 16 | 0 |
| 1994 | 13 | 0 |
| 1995 | 4 | 0 |
| 1996 | 7 | 0 |
| 1997 | 6 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 6 | 0 |
| 2001 | 11 | 1 |
| 2002 | 5 | 4 |
| 2003 | 2 | 7 |
| 2004 | 7 | 4 |
| 2005 | 3 | 5 |
| 2006 | 2 | 13 |
| 2007 | 4 | 11 |
| 2008 | 5 | 14 |
| 2009 | 9 | 5 |
| 2010 | 12 | 12 |
| 2011 | 5 | 23 |
| 2012 | 8 | 26 |
| 2013 | 15 | 30 |
| 2014 | 10 | 33 |
| 2015 | 14 | 48 |
| 2016 | 15 | 62 |
| 2017 | 42 | 66 |
| 2018 | 48 | 77 |
| 2019 | 55 | 50 |
| 2020 | 56 | 50 |
| 2021 | 50 | 55 |
| 2022 | 45 | 33 |
| 2023 | 38 | 31 |
| 2024 | 28 | 31 |
| 2025 | 26 | 21 |
| 2026 | 9 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
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.
- Degradable fibers for water savings in hydraulic fracturing19 May 2026US 12,631,100 B2Schlumberger Technology Corporation
- Ultra-lightweight proppants5 May 2026US 12,618,001 B2Saudi Arabian Oil Company
- Method for modifying the permeability of a geological formation zone20 Aug 2026US 2026/0243145 A1
- Methods, systems, and compositions for in-situ foam generation for liquid unloading23 Jul 2026US 2026/0209595 A1Saudi Arabian Oil Company
- Microcapsules for controlled release of actives agents, and use of said microcapsules in the oil and gas industry16 Jul 2026US 2026/0201243 A1Repsol, S. A.
- 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
Most cited
By later US patents
- Controlling the release of chemical additives in well treating fluids282US 6,209,646 B1Halliburton Energy Services.Inc. · 2001
- Encapsulated breakers, compositions and methods of use267US 6,162,766 A3M Innovative Properties Company · 2000
- Well treatment251US 5,964,291 AAEA Technology plc · 1999
- Method for treating subterranean formations246US 4,741,401 AThe Dow Chemical Company · 1988
- Downhole chemical delivery system for oil and gas wells243US 6,279,656 B1Santrol, Inc. · 2001