E21F 1/16
Shaft covers
E21F1/16 (Shaft covers) appears on 4 US grants and 2 published applications in this corpus.
Search patents in E21F- Granted patents
- 4
- Published applications
- 2
- Assignees
- 2
- Inventors
- 4
- Latest grant
- 19 Mar 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1996 | 1 | 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 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 2 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Ventilation system19 Mar 2024US 11,933,177 B2Toyota Jidosha Kabushiki Kaisha
- Mine ventilation structure and a deck panel for such a structure20 Sep 2016US 9,447,685 B2Jack Kennedy Metal Products & Buildings, Inc.
- Mine ventilation structure and a deck panel for such a structure19 Jul 2016US 9,394,788 B2Jack Kennedy Metal Products & Buildings, Inc.
- Borehole ventilation sealcover23 Apr 1996US 5,509,477 A
Most cited
By later US patents