Knuckle joints or links between arch members

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Patents Grantslast 30 patents

Information Patent Grant
High-strength confined concrete support system for underground tunnel
- Patent number 10,415,387
- Issue date Sep 17, 2019
- Shandong University
- Shucai Li
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rib for supporting and reinforcing an excavation
- Patent number 9,085,977
- Issue date Jul 21, 2015
- ELAS GEOTECNICA S.R.L.
- Cristiano Bonomi
- E21 - EARTH DRILLING MINING
Information Patent Grant
Fishplate
- Patent number 4,685,839
- Issue date Aug 11, 1987
- Hollybank Engineering Company Limited
- Michael G. Plater
- E04 - BUILDING
Information Patent Grant
Process and device for the assembly of voussoirs for tunnel linings
- Patent number 4,318,637
- Issue date Mar 9, 1982
- Pont-A-Mousson S.A.
- Jacques F. Oger
- E21 - EARTH DRILLING MINING
Information Patent Grant
3871183
- Patent number 3,871,183
- Issue date Mar 18, 1975
- E21 - EARTH DRILLING MINING
Information Patent Grant
3018126
- Patent number 3,018,126
- Issue date Jan 23, 1962
- E21 - EARTH DRILLING MINING
Information Patent Grant
2749713
- Patent number 2,749,713
- Issue date Jun 12, 1956
- E21 - EARTH DRILLING MINING
Information Patent Grant
2510593
- Patent number 2,510,593
- Issue date Jun 6, 1950
- E21 - EARTH DRILLING MINING