F27B 7/00
Rotary-drum furnaces, i.e. horizontal or slightly inclined
F27B7/00 (Rotary-drum furnaces, i.e. horizontal or slightly inclined) appears on 1,187 US grants and 727 published applications in this corpus.
Search patents in F27B- Granted patents
- 1,187
- Published applications
- 727
- Assignees
- 666
- Inventors
- 2,245
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 35 | 0 |
| 1977 | 41 | 0 |
| 1978 | 45 | 0 |
| 1979 | 14 | 0 |
| 1980 | 40 | 0 |
| 1981 | 44 | 0 |
| 1982 | 40 | 0 |
| 1983 | 38 | 0 |
| 1984 | 33 | 0 |
| 1985 | 38 | 0 |
| 1986 | 17 | 0 |
| 1987 | 21 | 0 |
| 1988 | 13 | 0 |
| 1989 | 16 | 0 |
| 1990 | 19 | 0 |
| 1991 | 16 | 0 |
| 1992 | 18 | 0 |
| 1993 | 25 | 0 |
| 1994 | 21 | 0 |
| 1995 | 19 | 0 |
| 1996 | 23 | 0 |
| 1997 | 16 | 0 |
| 1998 | 35 | 0 |
| 1999 | 33 | 0 |
| 2000 | 18 | 0 |
| 2001 | 26 | 9 |
| 2002 | 26 | 18 |
| 2003 | 18 | 12 |
| 2004 | 16 | 17 |
| 2005 | 11 | 12 |
| 2006 | 8 | 15 |
| 2007 | 8 | 21 |
| 2008 | 10 | 21 |
| 2009 | 7 | 26 |
| 2010 | 11 | 32 |
| 2011 | 21 | 43 |
| 2012 | 23 | 43 |
| 2013 | 23 | 35 |
| 2014 | 28 | 42 |
| 2015 | 30 | 29 |
| 2016 | 25 | 37 |
| 2017 | 34 | 32 |
| 2018 | 34 | 23 |
| 2019 | 21 | 25 |
| 2020 | 16 | 22 |
| 2021 | 19 | 24 |
| 2022 | 11 | 18 |
| 2023 | 18 | 50 |
| 2024 | 17 | 44 |
| 2025 | 26 | 50 |
| 2026 | 22 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F27B 7/20Details, accessories or equipment specially adapted for rotary-drum furnaces1,056
- F27B 7/14Rotary-drum furnaces, i.e. horizontal or slightly inclined: with means for agitating or145
- F27B 7/08Externally heated68
- F27B 7/02Rotary-drum furnaces, i.e. horizontal or slightly inclined: of multiple-chamber or multiple-drum type52
- F27B 7/10Internally heated41
- F27B 7/06Rotary-drum furnaces, i.e. horizontal or slightly inclined: adapted for treating the charge29
- F27B 7/12Tiltable22
- F27B 2007/005Rotary-drum furnaces, i.e. horizontal or slightly inclined: for the treatment of slurriesIndexing code4
Recent patents
- Deployable multi-zone rotary-kiln system and method for recovery of gallium oxide from electronic waste15 Sep 2026US 12,735,769 B1Simple Approach Systems, Inc.
- Device for smelting and regenerating phosphogypsum using high-temperature ceramsite and method for using same8 Sep 2026US 12,729,157 B2Hubei Juhai Environmental Technology Co., Ltd.
- Combustible waste treatment method8 Sep 2026US 12,729,852 B2Taiheiyo Cement Corporation
- Method and device for producing cement clinker1 Sep 2026US 12,723,002 B2thyssenkrupp AG
- Sealing structure of horizontal rotary pyrolysis kiln1 Sep 2026US 12,723,811 B2Henan Longcheng Coal High Efficiency Technology Application Co., Ltd.
- Sintering devices, sintering assemblies, and associated methods8 Oct 2026US 2026/0307146 A1Battelle Energy Alliance, LLC
- Climate-friendly puzzolana production8 Oct 2026US 2026/0309419 A1thyssenkrupp AG
- Direct-fired kiln using recycled flue gas8 Oct 2026US 2026/0309420 A1ExxonMobil Technology and Engineering Company
- Method for flame control in a rotary lime kiln1 Oct 2026US 2026/0298539 A1Valmet Corporation
- Refining and/or petrochemical facility and apparatus for heating fluids in processes related to refining and petrochemical industries using rotary generated thermal energy17 Sep 2026US 2026/0274747 A1Coolbrook Oy
Most cited
By later US patents
- Method and apparatus for preparing agglomerates suitable for use in a blast furnace117US 4,055,390 AMolten Metal Engineering Co. · 1977
- Apparatus for the heat treatment of fine material99US 4,720,262 AKrupp Polysius AG · 1988
- Apparatus for calcining cement98US 3,975,148 AOnoda Cement Co., Ltd. · 1976
- Device and method for obtaining non-ferrous metals86US 8,480,950 B2Pyrotek, Inc. · 2013
- System and method for treating dust contained in extracted cement kiln combustion gas76US 7,749,311 B2Taiheiyo Cement Corporation · 2010