E21C 25/28
Chains or chain guides
E21C25/28 (Chains or chain guides) appears on 29 US grants and 19 published applications in this corpus.
Search patents in E21C- Granted patents
- 29
- Published applications
- 19
- Assignees
- 16
- Inventors
- 29
- Latest grant
- 27 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 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 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 2 |
| 2017 | 0 | 0 |
| 2018 | 1 | 7 |
| 2019 | 3 | 1 |
| 2020 | 2 | 5 |
| 2021 | 5 | 1 |
| 2022 | 3 | 1 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Forklift hydraulic motor based industrial driver apparatus27 May 2025US 12,313,096 B2One Pass Innovators, LLC
- Chain connector9 Apr 2024US 11,953,077 B2Advanced Chain Technologies (A.C.T.) PTY LTD
- Mining pin retention system19 Dec 2023US 11,846,187 B2ITR America, LLC
- Chain conveyor and link for same20 Dec 2022US 11,530,095 B2Joy Global Underground Mining LLC
- Chain conveyor13 Sep 2022US 11,440,736 B2Joy Global Underground Mining LLC
- Articulated assembly of two links, and associated removal chain1 Jun 2023US 2023/0167612 A1Matisa Materiel Industriel S.A.
- Forklift hydraulic motor based industrial driver apparatus23 Jun 2022US 2022/0196041 A1One Pass Innovators, LLC
- Chain conveyor5 Aug 2021US 2021/0237979 A1Joy Global Underground Mining LLC
- Chain conveyor and link for same12 Nov 2020US 2020/0354150 A1Joy Global Underground Mining LLC
- Chain Connector7 May 2020US 2020/0141473 A1Acteuro Limited
Most cited
By later US patents
- Chain saw23US 4,981,129 A1991
- Continuous mining machine with a chain drive for the cutting head17US 3,968,995 ADresser Industries, Inc. · 1976
- Chain for trencher apparatus14US 5,248,188 A1993
- Chain conveyor with cast sections12US 10,106,325 B2Joy Global Underground Mining LLC · 2018
- Endless chains comprised of interdigitated link elements having an H-shaped configuration12US 4,674,803 AThe Cincinnati Mine Machinery Company · 1987