C04B 7/4423
Waste or refuse used as fuel
Official title: {Waste or refuse used as fuel}
C04B7/4423 (Waste or refuse used as fuel) appears on 41 US grants and 47 published applications in this corpus.
Search patents in C04B- Granted patents
- 41
- Published applications
- 47
- Assignees
- 40
- Inventors
- 139
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 3 |
| 2011 | 0 | 2 |
| 2012 | 3 | 1 |
| 2013 | 2 | 5 |
| 2014 | 1 | 3 |
| 2015 | 2 | 4 |
| 2016 | 4 | 1 |
| 2017 | 2 | 1 |
| 2018 | 1 | 1 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 2 | 5 |
| 2022 | 1 | 6 |
| 2023 | 1 | 1 |
| 2024 | 1 | 2 |
| 2025 | 3 | 3 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Use of a hydraulic binder containing calcium aluminate for the production of a construction material12 May 2026US 12,623,963 B2ARDEX Group GmbH
- Method and system for recycling waste minerals29 Jul 2025US 12,372,302 B2Trinity Synergies A/S
- Wastewater treatment system and method for producing sludge for cement manufacturing24 Jun 2025US 12,338,146 B2Alden Group Environmental Solutions, LLC
- Method for the manufacture of hydraulic binders from water treatment residuals15 Apr 2025US 12,275,673 B2ARDEX Group GmbH
- Process for producing a binder22 Oct 2024US 12,122,725 B2ARDEX Group GmbH
- Cement firing facility and firing method20 Aug 2026US 2026/0242279 A1Sumitomo Osaka Cement Co., Ltd.
- Method for reusing and recycling waste generated from cement production process and system therefor30 Apr 2026US 2026/0115666 A1Sumitomo Osaka Cement Co., Ltd.
- Combustion method using fuel combustion device, cement manufacturing method, and cement firing facility30 Apr 2026US 2026/0117967 A1Sumitomo Osaka Cement Co., Ltd.
- Method for thermal activation of coal gangue and in-situ carbon fixation utilizing waste heat from steel slag11 Dec 2025US 2025/0376416 A1Taiyuan University of Technology
- Method for producing cement clinker3 Jul 2025US 2025/0214891 A1Tokuyama Corporation
Most cited
By later US patents
- Method for effectively utilizing waste tires30US 4,256,503 ABridgestone Tire Company Limited · 1981
- Treatment of a waste sludge to produce a non-sticking fuel21US 5,288,413 AShell Oil Company · 1994
- Process for producing cement clinker20US 4,110,121 APortlandzementwerk Dotternhausen Rudolf Rohbach Kommanditgesellschaft · 1978
- Disposal of waste tires20US 5,989,017 ABlue Circle Industries Limited · 1999
- Apparatus and method for incinerating waste material with a converted preheater-type lime kiln18US 4,546,711 AMarblehead Lime Company · 1985