B21J 7/20
Drives for hammers
Official title: Drives for hammers; Transmission means therefor
B21J7/20 (Drives for hammers) appears on 102 US grants and 48 published applications in this corpus.
Search patents in B21J- Granted patents
- 102
- Published applications
- 48
- Assignees
- 52
- Inventors
- 190
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 1 | 0 |
| 1978 | 9 | 0 |
| 1979 | 7 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 5 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 8 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 2 |
| 2004 | 3 | 3 |
| 2005 | 2 | 2 |
| 2006 | 1 | 3 |
| 2007 | 0 | 0 |
| 2008 | 2 | 2 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 1 | 1 |
| 2017 | 1 | 3 |
| 2018 | 2 | 5 |
| 2019 | 4 | 2 |
| 2020 | 2 | 3 |
| 2021 | 3 | 4 |
| 2022 | 0 | 2 |
| 2023 | 1 | 3 |
| 2024 | 2 | 3 |
| 2025 | 4 | 3 |
| 2026 | 4 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Methods of material forming and/or cutting28 Apr 2026US 12,611,706 B2Cell Impact AB
- Hand-held impact tool for creating dent flaws28 Apr 2026US 12,611,708 B2Textron Innovations Inc.
- Hydraulic forming machine for pressing workpieces, in particular forging hammer, and method for operating a hydraulic forming machine, in particular a forging hammer14 Apr 2026US 12,599,954 B2Langenstein & Schemann GmbH
- Temperature control system for additive manufacturing and method for same17 Feb 2026US 12,551,972 B2General Electric Company
- Method for monitoring and for changing the position of at least one running bar of a metal press, and metal press12 Aug 2025US 12,383,947 B2SMS group GmbH
- Smx forging strategy25 Dec 2025US 2025/0387826 A1SMS group GmbH
- Hand-held impact tool for creating dent flaws11 Sep 2025US 2025/0281965 A1Textron Innovations Inc.
- Hydraulic Forming Machine for Workpiece Forming, Hydraulic Control Unit and Method for Controlling a Hydraulic Cylinder of a Hydraulic Forming Machine6 Mar 2025US 2025/0073774 A1
- Material forming8 Aug 2024US 2024/0261848 A1Cell Impact AB
- Hot forming a cast forging ingot27 Jun 2024US 2024/0207922 A1GFM GmbH
Most cited
By later US patents
- Method of welding metals using stress waves35US 3,961,739 AGrumman Aerospace Corporation · 1976
- Electromagnetic high energy impact apparatus27US 4,128,000 AThe Boeing Company · 1978
- Recoil assembly for electromagnetic high energy impact apparatus27US 4,151,735 AThe Boeing Company · 1979
- Ram assembly for electromagnetic high energy impact apparatus24US 4,132,108 AThe Boeing Company · 1979
- Method and apparatus for working a hole20US 4,129,028 AGrumman Aerospace Corporation · 1978