E21C 35/23
Distribution of spraying-fluids in rotating cutter-heads
E21C35/23 (Distribution of spraying-fluids in rotating cutter-heads) appears on 76 US grants and 20 published applications in this corpus.
Search patents in E21C- Granted patents
- 76
- Published applications
- 20
- Assignees
- 40
- Inventors
- 91
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 6 | 0 |
| 1985 | 6 | 0 |
| 1986 | 7 | 0 |
| 1987 | 7 | 0 |
| 1988 | 7 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 1 | 2 |
| 2015 | 2 | 1 |
| 2016 | 1 | 3 |
| 2017 | 1 | 2 |
| 2018 | 2 | 0 |
| 2019 | 2 | 0 |
| 2020 | 1 | 3 |
| 2021 | 1 | 1 |
| 2022 | 1 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Cutter head for mining machine12 Aug 2025US 12,385,395 B2Joy Global Underground Mining LLC
- Method for removing material from a rock wall15 Aug 2023US 11,725,512 B2Joy Global Underground Mining LLC
- Cutter head for mining machine28 Jun 2022US 11,371,346 B2Joy Global Underground Mining LLC
- Hard rock roadway and tunnel boring machine with actively rotating hobs14 Dec 2021US 11,199,092 B2China University of Mining and Technology
- Cutter pick assembly with water spray assembly10 Nov 2020US 10,830,042 B2Minnovation Limited
- Cutter head for mining machine18 Apr 2024US 2024/0125232 A1Joy Global Underground Mining LLC
- Cutter head for mining machine3 Nov 2022US 2022/0349306 A1Joy Global Underground Mining LLC
- Hard rock roadway and tunnel boring machine with actively rotating hobs29 Jul 2021US 2021/0231013 A1China University of Mining and Technology
- Rotary cutting head with fluid supply ducting3 Dec 2020US 2020/0378253 A1Sandvik Intellectual Property AB
- Cutter pick assembly with water spray assembly2 Jul 2020US 2020/0208516 A1Minnovation Limited
Most cited
By later US patents
- Nozzle for supplying a liquid to a rotating tool40US 5,826,478 AAndreas Stihl AG & CO.KG · 1998
- Rotary cutter for gouging out ore from mine faces25US 4,647,112 ACharbonnages de France · 1987
- Mining machine25US 4,755,002 ADosco Overseas Engineering Ltd. · 1988
- Fluid supply systems for rotary cutter heads for mining machines and rotary cutter heads comprising fluid supply systems24US 4,516,807 ACoal Industry (Patents) Limited · 1985
- Apparatus and method for delivering liquid coolant to drum mounted cutting tools24US 4,786,111 A1988