Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Mark B. Nichols0
Date of Patent
January 22, 2019
0Patent Application Number
152259280
Date Filed
August 2, 2016
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A downhole communication valve containing a piston and chamber which allows hyrdrostatic testing of a casing or tubing string multiple times before permanently opening communication ports to the exterior.
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