Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
October 25, 2011
Patent Application Number
12528035
Date Filed
February 28, 2008
Patent Citations Received
Patent Primary Examiner
Patent abstract
A drilling head, method of drilling, and use of the drilling head, for reboring a stuck valve or drilling into the formation downhole and, in particular a drilling tool having a drilling head and a driving unit. The drilling head includes a hole saw beside a drill bit for cutting out a piece from the stuck valve. A drilling system includes the drilling tool and a driving tool for moving the drilling tool downhole.
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