F27B 7/22
Rotary drums
Official title: Rotary drums; Supports therefor
F27B7/22 (Rotary drums) appears on 148 US grants and 83 published applications in this corpus.
Search patents in F27B- Granted patents
- 148
- Published applications
- 83
- Assignees
- 120
- Inventors
- 290
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 5 | 0 |
| 1982 | 7 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 5 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 1 |
| 2002 | 6 | 4 |
| 2003 | 4 | 2 |
| 2004 | 1 | 3 |
| 2005 | 1 | 1 |
| 2006 | 1 | 2 |
| 2007 | 1 | 3 |
| 2008 | 1 | 3 |
| 2009 | 0 | 1 |
| 2010 | 2 | 1 |
| 2011 | 4 | 5 |
| 2012 | 3 | 3 |
| 2013 | 3 | 7 |
| 2014 | 3 | 5 |
| 2015 | 3 | 0 |
| 2016 | 4 | 4 |
| 2017 | 4 | 1 |
| 2018 | 2 | 2 |
| 2019 | 0 | 3 |
| 2020 | 1 | 1 |
| 2021 | 0 | 3 |
| 2022 | 2 | 5 |
| 2023 | 3 | 9 |
| 2024 | 5 | 3 |
| 2025 | 6 | 6 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Sealing structure of horizontal rotary pyrolysis kiln1 Sep 2026US 12,723,811 B2Henan Longcheng Coal High Efficiency Technology Application Co., Ltd.
- Cathode material drying device and cathode material drying production line7 Apr 2026US 12,595,962 B2Guangdong Brunp Recycling Technology Co., Ltd.
- Sealing system with automatic compensation for thermal expansion for a rotary cylindrical reactor24 Feb 2026US 12,560,380 B2Tecnored Desenvolvimento TecnolóGico S/A
- Rotary kiln and method for burning carbonate-containing material, in particular limestone or dolomite2 Sep 2025US 12,405,060 B2S. A. Lhoist Recherche et Developpement
- Rotary kiln sealing system and rotary kiln equipment20 May 2025US 12,305,921 B2Henan Longcheng Coal High Efficiency Technology Application Co., Ltd.
- Method for preparing silicon powders using waste silicon sludge, silicon powders for preparing a secondary battery negative-electrode material, and system for preparing silicon powders27 Aug 2026US 2026/0249334 A1Innox Ecom. Co., Ltd.
- Electrode Material Sintering System27 Aug 2026US 2026/0249353 A1LG Chem.Ltd.
- Rotary seal for a high-temperature rotary kiln6 Aug 2026US 2026/0227130 A1Redwood Materials, Inc.
- New type protective rotary kiln equipment16 Apr 2026US 2026/0104204 A1Yingna Materials Technology (Zhenjiang)Co., Ltd.
- Rotation seal-cooling structure, heating device, and rotation seal-cooling method2 Apr 2026US 2026/0092648 A1Tsukishima Kikai Co., Ltd.
Most cited
By later US patents
- Seal assembly and method for providing a seal in a rotary kiln35US 4,193,756 ATosco Corporation · 1980
- Radial seal35US 4,961,588 AWestinghouse Electric Corp. · 1990
- Rotary reducing kiln seal23US 3,940,239 AAllis-Chalmers Corporation · 1976
- Labyrinth sealing system22US 4,199,154 AStauffer Chemical Company · 1980
- Metal leaf rotary seal for rotary drum22US 4,405,137 A1983