E21D 23/22
Incorporated in mine caps
Official title: incorporated in mine caps
E21D23/22 (Incorporated in mine caps) appears on 3 US grants and 0 published applications in this corpus.
Search patents in E21D- Granted patents
- 3
- Published applications
- 0
- Assignees
- 2
- Inventors
- 4
- Latest grant
- 19 Mar 1991
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Shaking control unit for a hydraulic cylinder19 Mar 1991US 5,000,622 ABochumer Eisenhutte Heintzmann GmbH & Co. KG
- Shaking control unit for a hydraulic cylinder13 Mar 1990US 4,907,918 ABochumer Eisenhutte Heintzmann GmbH & Co. KG
- Mine-roof support control mechanism14 Aug 1984US 4,465,408 AHermann Hemscheidt Maschinenfabrik GmbH & Co.
No published applications in this class yet.
Most cited
By later US patents
- Mine-roof support control mechanism11US 4,465,408 AHermann Hemscheidt Maschinenfabrik GmbH & Co. · 1984
- Shaking control unit for a hydraulic cylinder2US 4,907,918 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1990
- Shaking control unit for a hydraulic cylinder2US 5,000,622 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1991