US Patent 7942481 Rock drill and method of breaking rock
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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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Patent Inventor Names
Jarmo Leppänen0
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US Patent 07942481 Rock drill and method of breaking rock US Patent 7942481 Rock drill and method of breaking rock
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Patent Number
079424810
Patent Number
79424810
Edits on 6 Apr, 2023
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Patent Jurisdiction
Patent Number
079424810
Date of Patent
May 17, 2011
0Patent Application Number
118860700
Date Filed
March 13, 2006
0Patent Primary Examiner
Edits on 7 Dec, 2021
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US Patent 07942481 Rock drill and method of breaking rock
Infobox
Is a
Patent jurisdiction
Patent number
07942481
Date of patent
May 17, 2011
Patent application number
11886070
Date Filed
March 13, 2006
Patent primary examiner
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