in the form of tubbing or of rings composed of profile elements

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Patents Grantslast 30 patents

Information Patent Grant
Anti-seismic support method for mine shaft
- Patent number 11,428,101
- Issue date Aug 30, 2022
- CHINA COAL RESEARCH INSTITUTE
- Qingjie Qi
- E21 - EARTH DRILLING MINING
Information Patent Grant
Fastener and method of sealing passage
- Patent number 10,309,220
- Issue date Jun 4, 2019
- Relborgn Pty Ltd.
- Deon Van Dyk
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Mine shaft liner plate system and method
- Patent number 8,795,777
- Issue date Aug 5, 2014
- Contech Engineered Solutions LLC
- Darrell J. Sanders
- E21 - EARTH DRILLING MINING
Information Patent Grant
Excavation shield apparatus and method
- Patent number 5,401,122
- Issue date Mar 28, 1995
- Gwinnett Enterprises, Limited
- Charles H. Pate
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
3707846
- Patent number 3,707,846
- Issue date Jan 2, 1973
- E21 - EARTH DRILLING MINING
Information Patent Grant
3058494
- Patent number 3,058,494
- Issue date Oct 16, 1962
- E21 - EARTH DRILLING MINING
Information Patent Grant
2057524
- Patent number 2,057,524
- Issue date Oct 13, 1936
- E21 - EARTH DRILLING MINING