Inventor · disambiguated record

Douglas Johns

Also filed as: JOHNS DOUGLAS M · JOHNS DOUGLAS MARSHALL

2 granted patents·9 citations·filing 2003–2006

53Inventor score

Technology areasF01B F02B

Files withCHASIN LAWRENCE C1 JOHNS DOUGLAS MARSHALL1

Top patents by PatentIndex Score

2 records

0169US7677210B2Rotating barrel type internal combustion engineCHASIN LAWRENCE C·Filed 2006·Granted Mar 16, 2010·7 cites·41 claims
0227US7210429B2Rotating positive displacement engineJOHNS DOUGLAS MARSHALL·Filed 2003·Granted May 1, 2007·2 cites·40 claims

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Douglas Johns — Patent Inventor | PatentIndex