Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Svein Stubstad0
Cliff Swiontek0
Lawrence E. Wells0
Preston Fox0
Date of Patent
July 22, 2008
0Patent Application Number
114145120
Date Filed
April 28, 2006
0Patent Primary Examiner
Patent abstract
A top drive system for wellbore operations, the top drive system including motor apparatus, a main shaft driven by the motor apparatus, the main shaft having a top end and a bottom end, a quill connected to the main shaft, and a gear system interconnected with the quill and the motor apparatus.
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