US Patent 9371708 Circulation sub and method for using same
Patent 9371708 was granted and assigned to National Oilwell Varco on June, 2016 by the United States Patent and Trademark Office.
Is a
Current Assignee
Date Filed
July 7, 2011
0
Date of Patent
June 21, 2016
0
Patent Application Number
13809151
0
Patent Citations Received
Patent Inventor Names
James William Weir
0
Andrew Shelton
0
Patent Jurisdiction
Patent Number
Patent Primary Examiner
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