C09K 8/48
Density increasing or weighting additives
C09K8/48 (Density increasing or weighting additives) appears on 129 US grants and 167 published applications in this corpus.
Search patents in C09K- Granted patents
- 129
- Published applications
- 167
- Assignees
- 35
- Inventors
- 261
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 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 | 1 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 2 | 4 |
| 2007 | 0 | 1 |
| 2008 | 3 | 1 |
| 2009 | 2 | 5 |
| 2010 | 2 | 3 |
| 2011 | 2 | 5 |
| 2012 | 2 | 10 |
| 2013 | 6 | 8 |
| 2014 | 7 | 17 |
| 2015 | 5 | 10 |
| 2016 | 8 | 3 |
| 2017 | 6 | 12 |
| 2018 | 8 | 28 |
| 2019 | 15 | 16 |
| 2020 | 15 | 11 |
| 2021 | 12 | 4 |
| 2022 | 10 | 5 |
| 2023 | 6 | 7 |
| 2024 | 8 | 10 |
| 2025 | 5 | 3 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for cementing a portion of a wellbore using a red mud cement composition31 Mar 2026US 12,590,506 B1King Fahd University of Petroleum and Minerals
- Compositions and methods for well cementing17 Mar 2026US 12,577,449 B2Schlumberger Technology Corporation
- Geopolymer compositions and methods11 Nov 2025US 12,467,335 B2Schlumberger Technology Corporation
- Method of reacting CO2 by emulsifying cement and use in oilwell cementing24 Jun 2025US 12,338,388 B2Saudi Arabian Oil Company
- Compositions and methods for well cementing10 Jun 2025US 12,325,822 B2Schlumberger Technology Corporation
- Compositions and methods for well cementing23 Jul 2026US 2026/0209594 A1Schlumberger Technology Corporation
- Method of using steel-production byproduct heavy agent in subterranean formation fluids23 Jul 2026US 2026/0210204 A1King Fahd University of Petroleum and Minerals
- Cementitious mixture for cementing a wellbore27 Nov 2025US 2025/0361435 A1King Fahd University of Petroleum and Minerals
- Compositions and methods for well cementing2 Oct 2025US 2025/0304847 A1Schlumberger Technology Corporation
- Cementitious hematite-based geopolymer composition10 Jul 2025US 2025/0223229 A1King Fahd University of Petroleum and Minerals
Most cited
By later US patents
- Hydraulic cement slurry72US 4,935,060 AElkem a/s · 1990
- Composition for controlling wellbore fluid and gas invasion and method for using same70US 6,664,215 B12003
- Resilient cement compositions and methods of cementing58US 7,022,755 B1Halliburton Energy Services.Inc. · 2006
- Composition for controlling wellbore fluid and gas invasion and method for using same47US 7,044,222 B2Halliburton Energy Services.Inc. · 2006
- Resilient cement compositions and methods of cementing46US 7,404,855 B2Halliburton Energy Services.Inc. · 2008