Richard J. Robbins

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Seattle, WA, US

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus and method for monitoring tunnel boring efficiency
- Patent number 8,172,334
- Issue date May 8, 2012
- The Robbins Company
- Leif R. Lindbergh
- G01 - MEASURING TESTING
Information Patent Grant
Tunneling machine having liquid balance low flow slurry system
- Patent number 5,203,614
- Issue date Apr 20, 1993
- The Robbins Company
- Richard J. Robbins
- E21 - EARTH DRILLING MINING
Information Patent Grant
Double shield tunnel boring machine
- Patent number 4,420,188
- Issue date Dec 13, 1983
- The Robbins Company
- Richard J. Robbins
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rotary cutterhead for an earth boring machine
- Patent number 4,234,235
- Issue date Nov 18, 1980
- The Robbins Company
- Richard J. Robbins
- E21 - EARTH DRILLING MINING
Information Patent Grant
Upward tunneling
- Patent number 4,009,909
- Issue date Mar 1, 1977
- The Robbins Company
- Richard J. Robbins
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
APPARATUS AND METHOD FOR MONITORING TUNNEL BORING EFFICIENCY
- Publication number 20090297273
- Publication date Dec 3, 2009
- Leif R. Lindbergh
- E21 - EARTH DRILLING MINING