with wooden prop parts joined by double conical connectors

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Industry

CPC
E21D15/04

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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D15/00Props Chocks

Current Industry

E21D15/04with wooden prop parts joined by double conical connectors

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Patents Grantslast 30 patents

Information Patent Grant
Mine roof support crib having only two or three planes, and method
- Patent number 6,352,392
- Issue date Mar 5, 2002
- Strata Products (USA), Inc.
- Clifford A. McCartney
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mine support cribs
- Patent number 5,746,547
- Issue date May 5, 1998
- Strata Products, Inc.
- John Joseph Reinmann
- E21 - EARTH DRILLING MINING
Information Patent Grant
Spacer assembly and method
- Patent number 5,435,670
- Issue date Jul 25, 1995
- HL&H Timber Products (Proprietary) Limited
- Frans R. P. Pienaar
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Mine Roof Support Member and Method for Constructing Improved Mine...
- Publication number 20140133923
- Publication date May 15, 2014
- James Thomas Arnone
- E21 - EARTH DRILLING MINING
Information Patent Application
Lite mine roof support crib and method
- Publication number 20110164929
- Publication date Jul 7, 2011
- Gregory Roy Paton-Ash
- E21 - EARTH DRILLING MINING
Information Patent Application
Lite mine roof support crib and method
- Publication number 20060002770
- Publication date Jan 5, 2006
- Gregory Roy Paton-Ash
- E21 - EARTH DRILLING MINING
Information Patent Application
Lite mine roof support crib and method
- Publication number 20030068204
- Publication date Apr 10, 2003
- Strata Products (USA), Inc.
- Gregory Roy Paton-Ash
- E21 - EARTH DRILLING MINING