E21C 27/44
Planing knives
Official title: Planing knives (mining picks E21C35/18)
E21C27/44 (Planing knives) appears on 8 US grants and 3 published applications in this corpus.
Search patents in E21C- Granted patents
- 8
- Published applications
- 3
- Assignees
- 7
- Inventors
- 17
- Latest grant
- 5 Jun 2018
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 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 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Plow bit assembly5 Jun 2018US 9,988,904 B2Caterpillar Global Mining Europe GmbH
- Bit arrangement for a mining plough, and mining plough for plough systems6 May 2014US 8,714,659 B2Caterpiller Global Mining Europe GmbH
- Cutter-bit assemblies9 Aug 1988US 4,762,372 AGewerkschaft Eisenhutte Westfalia
- Cutters for use in mineral mining20 Jan 1987US 4,637,658 A
- Floor cutter bit15 Mar 1983US 4,376,553 AGewerkschaft Eisenhutte Westfalia
Most cited
By later US patents
- Rock cutting tip inserts34US 4,194,790 ACoal Industry (Patents) Limited · 1980
- Non-rotary mining cutter with recessed nozzle insert21US 4,280,735 AGewerkschaft Eisenhutte Westfalia · 1981
- Cutter-bit assemblies20US 4,762,372 AGewerkschaft Eisenhutte Westfalia · 1988
- Cutter bit assemblies for coal ploughs17US 4,076,318 AGewerkschaft Eisenhutte Westfalia · 1978
- Cutters for use in mineral mining5US 4,637,658 A1987