F22B 21/28
Bent spirally
Official title: bent spirally
F22B21/28 (Bent spirally) appears on 7 US grants and 4 published applications in this corpus.
Search patents in F22B- Granted patents
- 7
- Published applications
- 4
- Assignees
- 5
- Inventors
- 17
- Latest grant
- 20 Jun 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 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 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 2 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 2 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- High-efficiency two-chamber boiler using turbulent reverse flow of combustion gases20 Jun 2023US 11,680,704 B2
- Pressurized-water-cooled nuclear reactor with compact steam generators28 Jul 2015US 9,091,486 B2Del Nova Vis S.R.L.
- Steam generator23 Jun 2015US 9,062,918 B2Tsinghua University
- Steam generator and steam turbine driving unit using gaseous hydrogen as fuel4 May 1999US 5,899,072 A
- Heat exchanger16 Sep 1986US 4,611,655 APower Shaft Engine, Limited Partnership
- Novel high-efficiency two-chamber boiler using turbulent reverse flow of combustion gases3 Nov 2022US 2022/0349570 A1
- Steam generator13 Aug 2015US 2015/0226419 A1Tsinghua University
- Pressurized-water-cooled nuclear reactor with compact steam generators1 Nov 2012US 2012/0275558 A1Del Nova Vis S.R.L.
- Steam generator1 Mar 2012US 2012/0048527 A1Tsinghua University
Most cited
By later US patents
- Heat exchanger29US 4,611,655 APower Shaft Engine, Limited Partnership · 1986
- Steam generator and steam turbine driving unit using gaseous hydrogen as fuel17US 5,899,072 A1999
- External combustion engine5US 4,561,256 APower Shaft Engine · 1985
- Steam generator2US 9,062,918 B2Tsinghua University · 2015
- Heat exchanger1US 4,552,292 AGeneral Electric Company · 1985