C04B 2/12
In shaft or vertical furnaces
Official title: in shaft or vertical furnaces (shaft or vertical furnaces in general F27B1/00)
C04B2/12 (In shaft or vertical furnaces) appears on 60 US grants and 54 published applications in this corpus.
Search patents in C04B- Granted patents
- 60
- Published applications
- 54
- Assignees
- 43
- Inventors
- 139
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 5 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 0 |
| 2008 | 1 | 3 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 5 |
| 2012 | 0 | 1 |
| 2013 | 2 | 2 |
| 2014 | 3 | 3 |
| 2015 | 2 | 2 |
| 2016 | 2 | 2 |
| 2017 | 1 | 0 |
| 2018 | 3 | 1 |
| 2019 | 1 | 2 |
| 2020 | 0 | 2 |
| 2021 | 2 | 0 |
| 2022 | 1 | 1 |
| 2023 | 2 | 5 |
| 2024 | 0 | 12 |
| 2025 | 1 | 4 |
| 2026 | 2 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Apparatus and process for production of burnt lime or dolomite8 Sep 2026US 12,729,156 B2Fels-Werke GmbH
- System and process for oxy-fuel calcination of lime-bearing sludge16 Jun 2026US 12,655,060 B2T. EN Process Technology, Inc.
- Method for calcining mineral rock in a regenerative parallel-flow vertical shaft furnace and furnace used1 Jul 2025US 12,344,556 B2S. A. Lhoist Recherche et Developpement
- Method and shaft furnace for burning carbon-containing material in a shaft furnace18 Jul 2023US 11,703,280 B2Maerz Ofenbau AG
- Calciner using recirculated gases20 Jun 2023US 11,680,013 B2Carmeuse Lime, Inc.
- Plant and method for burning carbonate rock24 Sep 2026US 2026/0285749 A1Scheuch Management Holding GmbH
- Parallel-flow regenerative shaft kiln and method of burning carbonate rock20 Aug 2026US 2026/0243516 A1Maerz Ofenbau AG
- Kiln and method for burning carbonate rock6 Aug 2026US 2026/0225953 A1Maerz Ofenbau AG
- Method for calcining carbonated mineral stones in a parallel flow regenerative kiln and implemented kiln23 Jul 2026US 2026/0210631 A1S. A. Lhoist Recherche et Developpment
- A pfr lime kiln provided with a nox abatement system16 Jul 2026US 2026/0202132 A1Yara International Asa
Most cited
By later US patents
- Shaft kiln utilized for lime production19US 4,747,773 A1988
- Method of burning pulverous raw material and rotary kiln plant therefor17US 4,025,295 AF. L. Smidth & Co. · 1977
- Process and installation for the production of calcined material13US 4,201,541 A1980
- Process for calcining mineral raw materials in a uniflow regenerative shaft furnace12US 4,315,735 AMaerz Ofenbau AG · 1982
- Double-incline shaft kiln12US 4,473,352 ANippon Lime, Ltd. · 1984