F22B 21/14
Involving a single upper drum and two or more lower drums
Official title: involving a single upper drum and two or more lower drums
F22B21/14 (Involving a single upper drum and two or more lower drums) appears on 10 US grants and 6 published applications in this corpus.
Search patents in F22B- Granted patents
- 10
- Published applications
- 6
- Assignees
- 6
- Inventors
- 18
- Latest grant
- 30 Mar 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 1 | 0 |
| 2021 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Flameless steam boiler30 Mar 2021US 10,962,220 B2Zhejiang Liju Boiler Co., Ltd.
- Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification21 Apr 2020US 10,627,105 B2
- Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification28 Feb 2017US 9,581,325 B2
- Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification22 Sep 2015US 9,140,446 B2
- Package boiler having steam generating units in tandem9 Oct 2012US 8,281,752 B2
- Flameless Steam Boiler12 Sep 2019US 2019/0277491 A1Zhejiang Liju Boiler Co., Ltd.
- Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification17 Aug 2017US 2017/0234529 A1
- Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification21 Apr 2016US 2016/0109116 A1
- Method and Apparatus for Improved Firing of Biomass and Other Solid Fuels for Steam Production and Gasification24 Oct 2013US 2013/0276723 A1
- Package boiler having steam generating units in tandem6 Jan 2011US 2011/0000445 A1
Most cited
By later US patents
- Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification4US 9,140,446 B22015
- Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification2US 10,627,105 B22020
- Horizontal industrial boiler system with improved ash removal means2US 4,667,613 A1987
- Package boiler having steam generating units in tandem2US 8,281,752 B22012
- Pulverized coal fired package boiler1US 4,031,861 ACombustion Engineering, Inc. · 1977