C04B 28/021
Ash cements
Official title: {Ash cements, e.g. fly ash cements (fly ash as filler C04B18/08); Cements based on incineration residues, e.g. alkali-activated slags from waste incineration (alkali-activated combustion residues as such C04B7/243; mixtures of the lime-pozzuolane type C04B28/18); Kiln dust cements}
C04B28/021 (Ash cements) appears on 354 US grants and 402 published applications in this corpus.
Search patents in C04B- Granted patents
- 354
- Published applications
- 402
- Assignees
- 253
- Inventors
- 840
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 6 | 0 |
| 1995 | 8 | 0 |
| 1996 | 10 | 0 |
| 1997 | 2 | 0 |
| 1998 | 7 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 2 |
| 2003 | 1 | 0 |
| 2004 | 2 | 1 |
| 2005 | 0 | 8 |
| 2006 | 3 | 6 |
| 2007 | 7 | 11 |
| 2008 | 8 | 7 |
| 2009 | 3 | 7 |
| 2010 | 7 | 11 |
| 2011 | 5 | 9 |
| 2012 | 10 | 29 |
| 2013 | 21 | 26 |
| 2014 | 14 | 29 |
| 2015 | 23 | 26 |
| 2016 | 19 | 15 |
| 2017 | 13 | 22 |
| 2018 | 16 | 30 |
| 2019 | 17 | 17 |
| 2020 | 21 | 28 |
| 2021 | 24 | 32 |
| 2022 | 17 | 13 |
| 2023 | 29 | 16 |
| 2024 | 9 | 22 |
| 2025 | 12 | 18 |
| 2026 | 7 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Low-cost four-element system cementitious material, preparation method and application thereof6 Oct 2026US 12,753,115 B2University of Science and Technology Beijing
- Hydraulic binder with low carbon footprint and high early strength18 Aug 2026US 12,709,575 B2ImerTech SAS
- Concrete element and method for its production12 May 2026US 12,623,965 B2METTEN Technologies GmbH & Co. KG
- Method for preparing cementing material by sintering activation of coal gangue5 May 2026US 12,617,721 B2Central South University
- Masonry material utilizing recycled construction and demolition waste7 Apr 2026US 12,595,208 B2Washington State University
- Production of low carbon hydraulic cement and concrete10 Sep 2026US 2026/0265142 A1
- Cement compositions and methods of making the same from waste27 Aug 2026US 2026/0250190 A1The Board of Trustees of The University of Alabama
- Use of recycled aggregates in a method of making compositions to promote marine-life20 Aug 2026US 2026/0242282 A1Partanna Global, Inc.
- Powder composition, mortar material for additive manufacturing, molded object, and method for manufacturing molded object20 Aug 2026US 2026/0242287 A1Polyuse Co., Ltd.
- Brine sludge activated silico-manganese fume based binary alkali activated binder30 Jul 2026US 2026/0217601 A1King Fahd University of Petroleum and Minerals
Most cited
By later US patents
- Methods of using settable compositions comprising cement kiln dust158US 7,077,203 B1Halliburton Energy Services.Inc. · 2006
- Settable spotting fluid compositions and methods151US 6,138,759 AHalliburton Energy Services.Inc. · 2000
- Fly ash cementing compositions and methods147US 5,383,521 AHalliburton Company · 1995
- Coal slag universal fluid139US 5,337,824 AShell Oil Company · 1994
- Coal combustion by-products-based lightweight structural materials and processes for making them132US 6,277,189 B1Board of Trustees of Southern Illinois University · 2001