F27B 7/20
Details, accessories or equipment specially adapted for rotary-drum furnaces
F27B7/20 (Details, accessories or equipment specially adapted for rotary-drum furnaces) appears on 1,056 US grants and 661 published applications in this corpus.
Search patents in F27B- Granted patents
- 1,056
- Published applications
- 661
- Assignees
- 581
- Inventors
- 1,958
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 30 | 0 |
| 1977 | 37 | 0 |
| 1978 | 41 | 0 |
| 1979 | 11 | 0 |
| 1980 | 37 | 0 |
| 1981 | 40 | 0 |
| 1982 | 37 | 0 |
| 1983 | 32 | 0 |
| 1984 | 32 | 0 |
| 1985 | 36 | 0 |
| 1986 | 14 | 0 |
| 1987 | 16 | 0 |
| 1988 | 11 | 0 |
| 1989 | 16 | 0 |
| 1990 | 16 | 0 |
| 1991 | 14 | 0 |
| 1992 | 15 | 0 |
| 1993 | 22 | 0 |
| 1994 | 13 | 0 |
| 1995 | 17 | 0 |
| 1996 | 20 | 0 |
| 1997 | 13 | 0 |
| 1998 | 29 | 0 |
| 1999 | 24 | 0 |
| 2000 | 15 | 0 |
| 2001 | 24 | 9 |
| 2002 | 25 | 17 |
| 2003 | 18 | 11 |
| 2004 | 14 | 16 |
| 2005 | 10 | 11 |
| 2006 | 8 | 14 |
| 2007 | 7 | 21 |
| 2008 | 10 | 21 |
| 2009 | 7 | 23 |
| 2010 | 11 | 29 |
| 2011 | 19 | 42 |
| 2012 | 22 | 38 |
| 2013 | 20 | 31 |
| 2014 | 27 | 37 |
| 2015 | 27 | 26 |
| 2016 | 23 | 33 |
| 2017 | 30 | 29 |
| 2018 | 31 | 21 |
| 2019 | 19 | 24 |
| 2020 | 15 | 17 |
| 2021 | 17 | 22 |
| 2022 | 10 | 18 |
| 2023 | 16 | 45 |
| 2024 | 16 | 35 |
| 2025 | 22 | 47 |
| 2026 | 20 | 24 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F27B 7/2016Arrangements of preheating devices for the charge368
- F27B 7/22Rotary drums148
- F27B 7/38Arrangements of cooling devices132
- F27B 7/32Arrangement of devices for charging120
- F27B 7/34Arrangements of heating devices120
- F27B 7/36Arrangements of air or gas supply devices114
- F27B 7/42Arrangement of controlling, monitoring, alarm or like devices112
- F27B 7/28Arrangements of linings59
All 15 subgroupsShow fewer
- F27B 7/2083Arrangements for the melting of metals or the treatment of molten metals55
- F27B 7/26Drives44
- F27B 7/33Arrangement of devices for discharging39
- F27B 7/2075Removing incrustations8
- F27B 7/30Arrangements of partitions8
- F27B 2007/2008Devices for reintroducing dust in the drumIndexing code3
- F27B 2007/2091Means for eliminating compounds from gases by condensationIndexing code3
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.
- 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.
- Cement kiln burner and method for operating same11 Aug 2026US 12,704,252 B2Taiheiyo Cement Corporation
- 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
- Method for manufacturing cement clinker10 Sep 2026US 2026/0265128 A1HSustainability GmbH
Most cited
By later US patents
- 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
- System and method for treating dust contained in extracted cement kiln combustion gas76US 7,749,311 B2Taiheiyo Cement Corporation · 2010
- Pyrolytic conversion system75US 5,225,044 AWayne Technology, Inc. · 1993
- Prefferential oxygen firing system for counter-current mineral calcining73US 6,077,072 AAmerican Air Liquide, Inc. · 2000