F26B 21/20
Circulating air or gases in closed cycles
Official title: Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
F26B21/20 (Circulating air or gases in closed cycles) appears on 636 US grants and 551 published applications in this corpus.
Search patents in F26B- Granted patents
- 636
- Published applications
- 551
- Assignees
- 475
- Inventors
- 1,454
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 12 | 0 |
| 1978 | 11 | 0 |
| 1979 | 9 | 0 |
| 1980 | 14 | 0 |
| 1981 | 13 | 0 |
| 1982 | 13 | 0 |
| 1983 | 6 | 0 |
| 1984 | 12 | 0 |
| 1985 | 11 | 0 |
| 1986 | 5 | 0 |
| 1987 | 10 | 0 |
| 1988 | 9 | 0 |
| 1989 | 12 | 0 |
| 1990 | 8 | 0 |
| 1991 | 6 | 0 |
| 1992 | 11 | 0 |
| 1993 | 17 | 0 |
| 1994 | 11 | 0 |
| 1995 | 9 | 0 |
| 1996 | 17 | 0 |
| 1997 | 6 | 0 |
| 1998 | 6 | 0 |
| 1999 | 9 | 0 |
| 2000 | 11 | 0 |
| 2001 | 8 | 0 |
| 2002 | 12 | 2 |
| 2003 | 5 | 13 |
| 2004 | 7 | 8 |
| 2005 | 6 | 11 |
| 2006 | 7 | 8 |
| 2007 | 5 | 12 |
| 2008 | 4 | 7 |
| 2009 | 1 | 11 |
| 2010 | 4 | 6 |
| 2011 | 6 | 17 |
| 2012 | 5 | 17 |
| 2013 | 11 | 17 |
| 2014 | 8 | 18 |
| 2015 | 10 | 22 |
| 2016 | 18 | 15 |
| 2017 | 12 | 23 |
| 2018 | 22 | 37 |
| 2019 | 29 | 35 |
| 2020 | 44 | 44 |
| 2021 | 34 | 29 |
| 2022 | 22 | 27 |
| 2023 | 25 | 44 |
| 2024 | 25 | 46 |
| 2025 | 27 | 46 |
| 2026 | 24 | 36 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Plastic dehumidification and drying device15 Sep 2026US 12,736,284 B2
- Electrode sheet oven drying apparatus, battery production device, and electrode sheet oven drying method8 Sep 2026US 12,729,909 B2Contemporary Amperex Technology (Hong Kong) Limited
- Integration chamber for mixing booth discharge gas and oven discharge gas and VOC removal system utilizing the same18 Aug 2026US 12,710,231 B2Hyundai Motor Company
- Electrode drying system11 Aug 2026US 12,704,324 B2LG Energy Solution, Ltd.
- Drying system28 Jul 2026US 12,693,073 B2Contemporary Amperex Technology (Hong Kong) Limited
- Dryer system8 Oct 2026US 2026/0309415 A1Scheuch Management Holding GmbH
- Oven for heating an article on a conveyor1 Oct 2026US 2026/0298534 A1CPM Packaging Ltd
- Oven for heating an article on a conveyor1 Oct 2026US 2026/0298537 A1CPM Packaging Ltd
- Oven for heating an article on a conveyor1 Oct 2026US 2026/0298538 A1CPM Packaging Ltd
- Dehumidification drying system for synthetic resin molding material17 Sep 2026US 2026/0276303 A1Osaka Reiken Co., Ltd.
Most cited
By later US patents
- Compact convection drying chamber for drying printed circuit boards and other electronic assemblies by enhanced evaporation550US 6,760,981 B2Speedline Technologies, Inc. · 2004
- Vertical heat treating apparatus359US 5,261,167 ATokyo Electron Sagami Limited · 1993
- Curing oven for magazine holding computer chip lead frames, providing flow direction control for hot gas stream349US 5,569,402 AEsec AG · 1996
- Armoire178US 5,369,892 A1994
- Armoire adaptable to a sauna, drum dryer, and tubular lighted clothing dryer with humidity damper control of exhaust gases163US 5,546,678 A1996