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Gap spar with ducking risers
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Patent number 6,309,141
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Issue date Oct 30, 2001
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Shell Oil Company
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Bobby Eugene Cox
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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Spar platform
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Patent number 6,263,824
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Issue date Jul 24, 2001
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Shell Oil Company
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Stephen W. Balint
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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Spar platform with spaced buoyancy
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Patent number 6,227,137
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Issue date May 8, 2001
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Shell Oil Company
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Donald Wayne Allen
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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Deepwater riser system
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Patent number 6,161,620
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Issue date Dec 19, 2000
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Shell Oil Company
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Bobby Eugene Cox
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E21 - EARTH DRILLING MINING
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Spar with improved VIV performance
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Patent number 6,092,483
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Issue date Jul 25, 2000
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Shell Oil Company
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Donald Wayne Allen
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT