F27D 3/0032
Using an air-lock
Official title: {using an air-lock}
F27D3/0032 (Using an air-lock) appears on 30 US grants and 20 published applications in this corpus.
Search patents in F27D- Granted patents
- 30
- Published applications
- 20
- Assignees
- 27
- Inventors
- 76
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 2 |
| 2004 | 2 | 6 |
| 2005 | 2 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 3 |
| 2009 | 1 | 3 |
| 2010 | 3 | 0 |
| 2011 | 1 | 0 |
| 2012 | 2 | 0 |
| 2013 | 1 | 1 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for distributing loads in a metal furnace1 Sep 2026US 12,723,813 B2Tecnored Desenvolvimento TecnolóGico S/A
- Preheating appartus for steel scrap and metallurgical melting vessel equipped therewith17 Apr 2018US 9,945,002 B2Primetals Technologies Austria GmbH
- Charging device for a shaft furnace19 Feb 2013US 8,376,681 B2Paul Wurth S. A.
- Three hopper charging installation for a shaft furnace10 Apr 2012US 8,152,430 B2Paul Wurth S. A.
- Multiple hopper charging installation for a shaft furnace10 Jan 2012US 8,092,136 B2Paul Wurth S. A.
- System and method for distributing loads in a metal furnace2 Jan 2025US 2025/0003683 A1Tecnored Desenvolvimento TecnolóGico S/A
- Plastic pyrolysis/emulsification system21 Jul 2022US 2022/0228068 A1
- Device to inject solid material into a bath of liquid metal, and corresponding method13 Feb 2014US 2014/0042676 A1Danieli & C. Officine Meccaniche SpA
- Preheating appartus for steel scrap and metallurgical melting vessel equipped therewith3 Oct 2013US 2013/0259082 A1Primetals Technologies Austria GmbH
- Multiple hopper charging installation for a shaft furnace9 Apr 2009US 2009/0092465 A1Paul Wurth S. A.
Most cited
By later US patents
- Apparatus for preheating and charging scrap materials12US 5,513,206 AIshikawajima-Harima Jukogyo Kabushiki Kaisha · 1996
- Method and apparatus for charging hot direct reduced iron from hot transport vessels into a melter or finisher11US 7,678,176 B2Midrex Technologies, Inc. · 2010
- Induction melting furnace with metered discharge9US 6,819,704 B2Inductotherm Corp. · 2004
- Apparatus for operating a distribution chute for changing ores and coals into a furnace8US 7,861,614 B2Posco · 2011
- Scrap metal fed system for a closed rotary kiln or heating oven6US 4,234,283 AAutomated Production Systems Corporation · 1980