David T. Cass

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Seattle, WA, US

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Patents Grantslast 30 patents

Information Patent Grant
Tunnel boring machine and method
- Patent number 5,890,771
- Issue date Apr 6, 1999
- David T. Cass
- E21 - EARTH DRILLING MINING
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
Hopper and hood combination for tunneling machine and tunneling mac...
- Patent number 5,127,711
- Issue date Jul 7, 1992
- The Robbins Company
- David T. Cass
- E21 - EARTH DRILLING MINING
Information Patent Grant
Shaft boring machine and method
- Patent number 4,646,853
- Issue date Mar 3, 1987
- The Robbins Company
- David B. Sugden
- 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