US Patent 7748445 Top drive with shaft seal isolation

Patent 7748445 was granted and assigned to National Oilwell Varco on July, 2010 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

National Oilwell Varco

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7748445

Date of Patent

July 6, 2010

Patent Application Number

12001484

Date Filed

December 11, 2007

Patent Primary Examiner

‌

Daniel P Stephenson

Patent abstract

A top drive system for wellbore drilling operations, the top drive system including a main shaft having an upper shaft seal system with a raised platform for supporting the seal system. The top drive may also have a shroud for covering the seal(s), and contaminants may flow down from the seals, since the seals are raised by the platform.

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