B21J 7/42
Operated by rotary drive
Official title: operated by rotary drive, e.g. electric motors
B21J7/42 (Operated by rotary drive) appears on 4 US grants and 0 published applications in this corpus.
Search patents in B21J- Granted patents
- 4
- Published applications
- 0
- Assignees
- 2
- Inventors
- 7
- Latest grant
- 17 Feb 1998
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 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 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- 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
- Laminated board and hammer combination for a drop hammer forge27 May 1980US 4,204,420 AMarion Plywood Corporation
- Laminated board and hammer combination for a drop hammer forge27 May 1980US 4,204,421 AMarion Plywood Corporation
No published applications in this class yet.
Most cited
By later US patents
- Power post driver and hammer15US 4,984,640 A1991
- 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