F27B 1/04
Combinations or arrangements of shafts
F27B1/04 (Combinations or arrangements of shafts) appears on 21 US grants and 20 published applications in this corpus.
Search patents in F27B- Granted patents
- 21
- Published applications
- 20
- Assignees
- 19
- Inventors
- 69
- Latest grant
- 1 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 2 |
| 2020 | 0 | 2 |
| 2021 | 2 | 0 |
| 2022 | 1 | 0 |
| 2023 | 1 | 2 |
| 2024 | 0 | 4 |
| 2025 | 1 | 2 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- 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
- Combined furnace28 Feb 2023US 11,591,247 B2Arc France
- Process for calcining mineral rock in a regenerative parallel-flow vertical shaft furnace, and furnace used22 Mar 2022US 11,280,546 B2S. A. Lhoist Recherche et Developpement
- System having a furnace and method for operating such a system15 Jun 2021US 11,034,616 B2Maerz Ofenbau AG
- Furnace and method for operating a furnace16 Mar 2021US 10,947,125 B2Maerz Ofenbau AG
- 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
- Method of calcining mineral rock in a regenerative parallel-flow vertical shaft furnace, and furnace used22 May 2025US 2025/0162934 A1S. A. Lhoist Recherche et Developpement
- Method of calcining mineral rock in a regenerative parallel-flow vertical shaft furnace, and furnace used22 May 2025US 2025/0162935 A1S. A. Lhoist Recherche et Developpement
Most cited
By later US patents
- Method at melting in a shaft furnace13US 3,958,919 ARockwool Aktiebolaget · 1976
- Double-incline shaft kiln12US 4,473,352 ANippon Lime, Ltd. · 1984
- Shaft kiln for burning a lumpy mineral charge10US 5,460,517 AMaerz Ofenbau AG · 1995
- Process for burning limestone, dolomite or the like and annular shaft furnace for performing the same6US 4,431,407 A1984
- Regenerative shaft furnace for burning carbonate-containing raw materials5US 4,382,779 AMaerz Ofenbau AG · 1983