Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Jarmo Leppänen0
Date of Patent
May 17, 2011
0Patent Application Number
118860700
Date Filed
March 13, 2006
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A method of breaking rock which includes the steps of drilling a hole in the rock using a drill rod; leaving the drill rod in the hole; using water flow to direct a propellant charge into the hole through a passage in the drill rod; and at a leading end of the drill rod, firing the propellant charge with, at least, the drill rod and water in the hole and passage providing a stemming function.
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