F27B 1/02
Shaft or like vertical or substantially vertical furnaces: with two or more
Official title: with two or more shafts or chambers, e.g. multi-storey
F27B1/02 (Shaft or like vertical or substantially vertical furnaces: with two or more) appears on 84 US grants and 48 published applications in this corpus.
Search patents in F27B- Granted patents
- 84
- Published applications
- 48
- Assignees
- 66
- Inventors
- 203
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 6 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 5 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 6 | 0 |
| 1988 | 6 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 1 |
| 2010 | 0 | 2 |
| 2011 | 1 | 2 |
| 2012 | 1 | 2 |
| 2013 | 2 | 1 |
| 2014 | 0 | 2 |
| 2015 | 2 | 2 |
| 2016 | 2 | 4 |
| 2017 | 0 | 1 |
| 2018 | 3 | 2 |
| 2019 | 3 | 2 |
| 2020 | 1 | 3 |
| 2021 | 2 | 0 |
| 2022 | 2 | 2 |
| 2023 | 1 | 4 |
| 2024 | 0 | 6 |
| 2025 | 4 | 3 |
| 2026 | 0 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Device for producing supplementary cementitious material4 Nov 2025US 12,459,861 B2Cemgreen APS
- 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
- Systems, methods and devices for cement manufacture10 Jun 2025US 12,325,671 B2Furno Materials Inc.
- Multistage vertical graphitization furnace system7 Jan 2025US 12,188,722 B2Efc Co., Ltd.
- Combined furnace28 Feb 2023US 11,591,247 B2Arc France
- Parallel-flow regenerative shaft kiln and method for burning carbonate rock8 Oct 2026US 2026/0309418 A1Maerz 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
- A pfr lime kiln provided with a nox abatement system16 Jul 2026US 2026/0202132 A1Yara International Asa
Most cited
By later US patents
- Vertical shaft melting furnace and method of melting65US 4,877,449 AInstitute of Gas Technology · 1989
- Melting furnace27US 5,107,517 AOy Partek AB · 1992
- Method and apparatus for the continuous melting of scrap24US 4,786,321 AFried. Krupp Gesellschaft mit beschrankter Haftung · 1988
- Solid refuse disposal apparatus19US 4,291,634 AUnion Carbide Corporation · 1981
- Plant for producing steel from scrap17US 4,740,989 AVoest-Alpine Aktiengesellschaft · 1988