C09K 8/473
Density reducing additives
Official title: Density reducing additives, e.g. for obtaining foamed cement compositions
C09K8/473 (Density reducing additives) appears on 343 US grants and 331 published applications in this corpus.
Search patents in C09K- Granted patents
- 343
- Published applications
- 331
- Assignees
- 68
- Inventors
- 452
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 9 | 2 |
| 2002 | 9 | 5 |
| 2003 | 12 | 17 |
| 2004 | 10 | 19 |
| 2005 | 11 | 13 |
| 2006 | 15 | 21 |
| 2007 | 11 | 12 |
| 2008 | 12 | 11 |
| 2009 | 13 | 14 |
| 2010 | 16 | 18 |
| 2011 | 9 | 8 |
| 2012 | 13 | 27 |
| 2013 | 20 | 21 |
| 2014 | 11 | 13 |
| 2015 | 16 | 8 |
| 2016 | 11 | 12 |
| 2017 | 13 | 10 |
| 2018 | 11 | 12 |
| 2019 | 14 | 17 |
| 2020 | 15 | 11 |
| 2021 | 10 | 15 |
| 2022 | 6 | 7 |
| 2023 | 12 | 10 |
| 2024 | 15 | 17 |
| 2025 | 8 | 5 |
| 2026 | 5 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Flexible composite25 Aug 2026US 12,716,020 B2Concrete Canvas Technology Ltd.
- Compositions and methods relating to increased carbon dioxide uptake in mixing and curing of concrete5 May 2026US 12,617,717 B2Saudi Arabian Oil Company
- Enhanced carbon sequestration via foam cementing21 Apr 2026US 12,606,732 B2Halliburton Energy Services.Inc.
- Compositions and methods for well cementing17 Mar 2026US 12,577,449 B2Schlumberger Technology Corporation
- Cement slurry compositions comprising pozzolanic cement additives and methods for improving development of compressive strengths in the cement slurry compositions24 Feb 2026US 12,559,663 B2Schlumberger Technology Corporation
- Compositions and methods for well cementing23 Jul 2026US 2026/0209594 A1Schlumberger Technology Corporation
- Cement slurry compositions comprising pozzolanic cement additives and methods for improving development of compressive strengths in the cement slurry compositions25 Jun 2026US 2026/0176522 A1Schlumberger Technology Corporation
- Hydrogen reactive oil well cement additives11 Jun 2026US 2026/0159746 A1Halliburton Energy Services.Inc.
- Fiber incorporated thixotropic cement slurry for lost circulation application21 May 2026US 2026/0139181 A1Halliburton Energy Services.Inc.
- Curable geopolymer slurry and treatement compositions and methods for producing and using said compositions12 Mar 2026US 2026/0070844 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Foamed well cement slurries, additives and methods302US 6,063,738 AHalliburton Energy Services.Inc. · 2000
- Well cementing compositions and methods244US 6,457,524 B1Halliburton Energy Services.Inc. · 2002
- Foamed well cement compositions, additives and methods189US 5,897,699 AHalliburton Energy Services.Inc. · 1999
- Light weight high temperature well cement compositions and methods187US 6,143,069 AHalliburton Energy Services.Inc. · 2000
- Light weight high temperature well cement compositions and methods183US 5,900,053 AHalliburton Energy Services.Inc. · 1999