Assignee
MARSHALL ALAN J
US·3 granted patents·1 pending application·18 citations·filing 2008–2014
Top patents by PatentIndex Score
4 records- 0176US8312613B2Percussion drilling assembly with annular locking memberMARSHALL ALAN J·Filed 2011·Granted Nov 20, 2012·5 cites·9 claims
- 0264US8312944B2Percussion hammer bit with a driver sub including a guide sleeve portionMARSHALL ALAN J·Filed 2009·Granted Nov 20, 2012·11 cites·13 claims
- 0346US8061450B2Percussion drilling assembly having erosion retarding casingMARSHALL ALAN J·Filed 2008·Granted Nov 22, 2011·2 cites·19 claims
- 0441US2016153236A1Percussion hammer bitMARSHALL ALAN J·Filed 2014·Application pending·0 cites
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