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Patents Grantslast 30 patents

Information Patent Grant
Tunnel liners and methods of making the same
- Patent number 4,070,866
- Issue date Jan 31, 1978
- Commercial Shearing, Inc.
- Ingvald O. Juvrud
- E21 - EARTH DRILLING MINING
Information Patent Grant
Shaft liner assembly
- Patent number 4,027,488
- Issue date Jun 7, 1977
- Radovan Preradovich
- E21 - EARTH DRILLING MINING
Information Patent Grant
1842735
- Patent number 1,842,735
- Issue date Jan 26, 1932
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL