Assignee
DRUMHELLER DOUGLAS S
US·2 granted patents·1 pending application·90 citations·filing 1992–2009
Top patents by PatentIndex Score
3 records- 0178US5274606ACircuit for echo and noise suppression of accoustic signals transmitted through a drill stringDRUMHELLER DOUGLAS S·Filed 1992·Granted Dec 28, 1993·86 cites·7 claims
- 0256US8270251B2Acoustic isolatorDRUMHELLER DOUGLAS S·Filed 2009·Granted Sep 18, 2012·4 cites·17 claims
- 0336US2007153629A1Acoustic isolatorDRUMHELLER DOUGLAS S·Filed 2006·Application pending·0 cites
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