C09K 8/16
Characterised by the inorganic compounds other than clay
Official title: characterised by the inorganic compounds other than clay
C09K8/16 (Characterised by the inorganic compounds other than clay) appears on 194 US grants and 134 published applications in this corpus.
Search patents in C09K- Granted patents
- 194
- Published applications
- 134
- Assignees
- 67
- Inventors
- 369
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 3 | 0 |
| 1994 | 14 | 0 |
| 1995 | 5 | 0 |
| 1996 | 5 | 0 |
| 1997 | 5 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 1 |
| 2002 | 3 | 0 |
| 2003 | 1 | 9 |
| 2004 | 5 | 11 |
| 2005 | 4 | 7 |
| 2006 | 11 | 9 |
| 2007 | 8 | 9 |
| 2008 | 7 | 5 |
| 2009 | 5 | 5 |
| 2010 | 4 | 4 |
| 2011 | 3 | 3 |
| 2012 | 1 | 1 |
| 2013 | 3 | 3 |
| 2014 | 2 | 2 |
| 2015 | 1 | 1 |
| 2016 | 1 | 2 |
| 2017 | 2 | 2 |
| 2018 | 5 | 7 |
| 2019 | 11 | 9 |
| 2020 | 11 | 8 |
| 2021 | 9 | 11 |
| 2022 | 7 | 4 |
| 2023 | 10 | 6 |
| 2024 | 10 | 8 |
| 2025 | 8 | 5 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for mitigating barite sag in water-based mud with thermochemical fluid11 Aug 2026US 12,704,032 B2King Fahd University of Petroleum and Minerals
- Water/gas ratio reducer compounds26 May 2026US 12,637,930 B2Petroraza SAS
- Wellbore and geologic formation desulfurization process14 Oct 2025US 12,441,930 B1King Fahd University of Petroleum and Minerals
- Eutectic metal alloy in drilling fluids and methods of use thereof7 Oct 2025US 12,435,255 B2Newpark Drilling Fluids LLC
- Silicate water-based drilling fluid for coalbed methane wells and application thereof16 Sep 2025US 12,415,945 B1Yangtze University
- Method of using steel-production byproduct heavy agent in subterranean formation fluids23 Jul 2026US 2026/0210204 A1King Fahd University of Petroleum and Minerals
- Porous material for wellbore thermal insulation in drilling and its preparation method and application11 Jun 2026US 2026/0159745 A1China Univesity of Petroleum (East China)
- Drilling with water-based mud including multiple clays23 Oct 2025US 2025/0326963 A1Saudi Arabian Oil Company
- Clay swelling inhibitors23 Oct 2025US 2025/0326964 A1Petroraza SAS
- Water/gas ratio reducer compounds23 Oct 2025US 2025/0327389 A1Petroraza SAS
Most cited
By later US patents
- Dilution of drilling fluid in forming cement slurries191US 5,314,022 AShell Oil Company · 1994
- Fluids for oilfield use having high-solids content174US 5,518,996 ADowell, a division of Schlumberger Technology Corporation · 1996
- Methods and compositions for controlling lost circulation in subterranean operations150US 7,284,611 B2Halliburton Energy Services.Inc. · 2007
- Cementitious well drilling fluids and methods149US 5,711,383 AHalliburton Company · 1998
- Coal slag universal fluid139US 5,337,824 AShell Oil Company · 1994