Inventor · disambiguated record
P. Douglas Free
Also filed as: FREE P DOUGLAS
4 granted patents·186 citations·filing 1993–2005
81Inventor score
Top patents by PatentIndex Score
4 records- 0193US5937807AEarly exhaust valve opening control system and methodCUMMINS ENGINE CO INC·Filed 1998·Granted Aug 17, 1999·80 cites·27 claims
- 0287US7090145B2Liquid cooled fuel injection valve and method of operating a liquid cooled fuel injection valveWESTPORT RES INC·Filed 2005·Granted Aug 15, 2006·22 cites·46 claims
- 0380US6202413B1Multiple nozzle ejector for wastegated turbomachineryCUMMINS ENGINE CO INC·Filed 1999·Granted Mar 20, 2001·67 cites·9 claims
- 0450US5372114ADampened pressure regulating and load cell tappetCUMMINS ENGINE CO INC·Filed 1993·Granted Dec 13, 1994·17 cites·15 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →