David P. Lindroth

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Apple Valley, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Microwave assisted hard rock cutting
- Patent number 5,003,144
- Issue date Mar 26, 1991
- The United States of America as represented by the Secretary of the Interior
- David P. Lindroth
- E21 - EARTH DRILLING MINING
Information Patent Grant
Automatic face transfer linear cutting rotary head continuous minin...
- Patent number 4,062,595
- Issue date Dec 13, 1977
- The United States of America as represented by the Secretary of the Interior
- Wallace W. Roepke
- E21 - EARTH DRILLING MINING
Information Patent Grant
Linear cutting rotary head continuous mining machine
- Patent number 4,012,077
- Issue date Mar 15, 1977
- The United States of America as represented by the Secretary of the Interior
- Wallace W. Roepke
- E21 - EARTH DRILLING MINING