Brad D. Grothen

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Renton, WA, US

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Patents Grantslast 30 patents

Information Patent Grant
Cutter assembly for tunnel boring machine with pressure compensation
- Patent number 8,783,786
- Issue date Jul 22, 2014
- The Robbins Company
- Aaron J. Shanahan
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
CUTTER ASSEMBLY FOR TUNNEL BORING MACHINE WITH PRESSURE COMPENSATION
- Publication number 20120212034
- Publication date Aug 23, 2012
- THE ROBBINS COMPANY
- Aaron J. Shanahan
- E21 - EARTH DRILLING MINING