B21J 7/36
For drop hammers
Official title: for drop hammers
B21J7/36 (For drop hammers) appears on 8 US grants and 2 published applications in this corpus.
Search patents in B21J- Granted patents
- 8
- Published applications
- 2
- Assignees
- 5
- Inventors
- 15
- Latest grant
- 27 Aug 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 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 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 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.
Subgroups
Granted patents
Recent patents
- Air-operated hammer27 Aug 2024US 12,071,738 B2Equipment Company of America
- Fluid operated actuator including a bleed port7 Jul 2015US 9,074,612 B2Norgren Limited
- Machine for performing high speed stamping and forming operations17 Feb 1998US 5,718,145 AThe Whitaker Corporation
- Power post driver and hammer15 Jan 1991US 4,984,640 A
- Hydropunch for use in a press17 Aug 1982US 4,344,313 A
Most cited
By later US patents
- Power post driver and hammer15US 4,984,640 A1991
- Drop hammers6US 4,100,977 ABSP International Foundations Limited · 1978
- Laminated board and hammer combination for a drop hammer forge6US 4,204,421 AMarion Plywood Corporation · 1980
- Laminated board and hammer combination for a drop hammer forge5US 4,204,420 AMarion Plywood Corporation · 1980
- Machine for performing high speed stamping and forming operations4US 5,718,145 AThe Whitaker Corporation · 1998