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Daniel H. Longwell
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Houston, TX, US
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last 30 patents
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Patent Grant
Floating vessel for supporting top tension drilling and production...
Patent number
7,886,828
Issue date
Feb 15, 2011
ATP Oil & Gas Corporation
Robert Magee Shivers, III
E21 - EARTH DRILLING MINING
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Patent Grant
Method for supporting top tension drilling and production risers on...
Patent number
7,588,393
Issue date
Sep 15, 2009
ATP Oil & Gas Corporation
Robert Magee Shivers, III
B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT