C04B 28/02
Containing hydraulic cements other than calcium sulfates
Official title: containing hydraulic cements other than calcium sulfates
C04B28/02 (Containing hydraulic cements other than calcium sulfates) appears on 6,129 US grants and 6,601 published applications in this corpus.
Search patents in C04B- Granted patents
- 6,129
- Published applications
- 6,601
- Assignees
- 2,619
- Inventors
- 12,083
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 39 | 0 |
| 1977 | 49 | 0 |
| 1978 | 68 | 0 |
| 1979 | 32 | 0 |
| 1980 | 54 | 0 |
| 1981 | 48 | 0 |
| 1982 | 49 | 0 |
| 1983 | 45 | 0 |
| 1984 | 60 | 0 |
| 1985 | 48 | 0 |
| 1986 | 35 | 0 |
| 1987 | 52 | 0 |
| 1988 | 57 | 0 |
| 1989 | 51 | 0 |
| 1990 | 64 | 0 |
| 1991 | 56 | 0 |
| 1992 | 72 | 0 |
| 1993 | 62 | 0 |
| 1994 | 99 | 0 |
| 1995 | 72 | 0 |
| 1996 | 96 | 0 |
| 1997 | 98 | 0 |
| 1998 | 112 | 0 |
| 1999 | 86 | 0 |
| 2000 | 68 | 0 |
| 2001 | 82 | 26 |
| 2002 | 88 | 103 |
| 2003 | 101 | 123 |
| 2004 | 107 | 192 |
| 2005 | 101 | 184 |
| 2006 | 97 | 189 |
| 2007 | 87 | 195 |
| 2008 | 120 | 211 |
| 2009 | 81 | 208 |
| 2010 | 171 | 232 |
| 2011 | 148 | 244 |
| 2012 | 190 | 291 |
| 2013 | 190 | 274 |
| 2014 | 210 | 284 |
| 2015 | 212 | 285 |
| 2016 | 198 | 288 |
| 2017 | 210 | 298 |
| 2018 | 213 | 342 |
| 2019 | 253 | 325 |
| 2020 | 302 | 360 |
| 2021 | 228 | 316 |
| 2022 | 235 | 333 |
| 2023 | 246 | 368 |
| 2024 | 258 | 377 |
| 2025 | 259 | 319 |
| 2026 | 170 | 234 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C04B 28/04Portland cements2,095
- C04B 28/06Aluminous cements716
- C04B 28/08Slag cements466
- C04B 28/10Lime cements or magnesium oxide cements363
- C04B 28/021Ash cements354
- C04B 28/025Belite cements12
- C04B 28/026Oil shale cements3
- C04B 28/023Barium cements0
All 9 subgroupsShow fewer
Recent patents
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Most cited
By later US patents
- High temperature wellbore cement slurry319US 5,226,961 AShell Oil Company · 1993
- Articles of manufacture and methods for manufacturing laminate structures including inorganically filled sheets312US 5,830,548 AE. Khashoggi Industries · 1998
- Light weight high temperature well cement compositions and methods273US 6,488,763 B2Halliburton Energy Services.Inc. · 2002
- Well cementing compositions and methods244US 6,457,524 B1Halliburton Energy Services.Inc. · 2002
- Hydrolytically stable polymers for use in oil field cementing methods and compositions237US 4,555,269 AHalliburton Company · 1985