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Frederick C. Duthweiler
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Anchorage, AK, US
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Patents Grants
last 30 patents
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Patent Grant
Method for preventing thaw settlement along offshore artic pipelines
Patent number
4,676,695
Issue date
Jun 30, 1987
Union Oil Company of California
Frederick C. Duthweiler
E21 - EARTH DRILLING MINING
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Patent Grant
Method and apparatus for building ice islands
Patent number
4,192,630
Issue date
Mar 11, 1980
Union Oil Company of California
Frederick C. Duthweiler
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Patent Grant
Ice islands and method for forming same
Patent number
4,048,808
Issue date
Sep 20, 1977
Union Oil Company of California
Frederick C. Duthweiler
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING