E21C 35/20
General features of equipment for removal of chippings
Official title: General features of equipment for removal of chippings, e.g. for loading on conveyor
E21C35/20 (General features of equipment for removal of chippings) appears on 158 US grants and 77 published applications in this corpus.
Search patents in E21C- Granted patents
- 158
- Published applications
- 77
- Assignees
- 68
- Inventors
- 286
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 10 | 0 |
| 1978 | 10 | 0 |
| 1979 | 4 | 0 |
| 1980 | 6 | 0 |
| 1981 | 7 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 2 |
| 2003 | 1 | 1 |
| 2004 | 2 | 0 |
| 2005 | 1 | 1 |
| 2006 | 0 | 2 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 1 | 1 |
| 2010 | 1 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 2 |
| 2013 | 1 | 3 |
| 2014 | 4 | 2 |
| 2015 | 1 | 3 |
| 2016 | 2 | 6 |
| 2017 | 0 | 9 |
| 2018 | 5 | 13 |
| 2019 | 12 | 2 |
| 2020 | 9 | 10 |
| 2021 | 6 | 8 |
| 2022 | 10 | 2 |
| 2023 | 3 | 1 |
| 2024 | 3 | 5 |
| 2025 | 3 | 0 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Tunneling system28 Jul 2026US 12,692,790 B2Ccteg Taiyuan Research Institute
- Fragmentation georeferencing20 Jan 2026US 12,529,313 B2Orica International Pte Ltd
- Bolter miner and tunneling system14 Oct 2025US 12,442,298 B2Ccteg Taiyuan Research Institute
- Systems and methods for automated control of a beam stageloader bootend19 Aug 2025US 12,391,483 B2Joy Global Underground Mining LLC
- Systems and methods for automated control of a beam stageloader bootend19 Aug 2025US 12,391,484 B2Joy Global Underground Mining LLC
- Systems and methods for automated control of a beam stageloader bootend19 Sep 2024US 2024/0308774 A1Joy Global Underground Mining LLC
- Systems and methods for automated control of a beam stageloader bootend19 Sep 2024US 2024/0308775 A1Joy Global Underground Mining LLC
- Tunneling System25 Jul 2024US 2024/0247551 A1Ccteg Taiyuan Research Institute
- Fragmentation georeferencing20 Jun 2024US 2024/0200446 A1Orica International Pte Ltd
- Tunneling and Anchoring Machine and Tunneling System20 Jun 2024US 2024/0200451 A1Ccteg Taiyuan Research Institute
Most cited
By later US patents
- Apparatus and method for continuous mining45US 5,112,111 AAddington Resources, Inc. · 1992
- Electrical control system for apparatus and method for continuous underground mining33US 5,967,616 AArch Technology Corporation · 1999
- Apparatus and method for continuous mining32US 5,667,279 AArch Mineral Corporation · 1997
- Flexible mobile conveyor29US 3,974,907 A1976
- Variable length conveyor assembly29US 4,474,287 A1984