Inventor · disambiguated record
Douglas W. Lee
Also filed as: LEE DOUGLAS W · LEE DOUGLAS WAYNE
8 granted patents·1 pending application·450 citations·filing 1987–2007
90Inventor score
Technology areasE21B
Top patents by PatentIndex Score
9 records- 0191US4907658APercussive mole boring device with electronic transmitterGAS RES INST·Filed 1988·Granted Mar 13, 1990·119 cites·7 claims
- 0289US4834193AEarth boring apparatus and method with control valveGAS RES INST·Filed 1987·Granted May 30, 1989·96 cites·31 claims
- 0380US5148880AApparatus for drilling a horizontal controlled borehole in the earthCHARLES MACHINE WORKS·Filed 1990·Granted Sep 22, 1992·78 cites·16 claims
- 0476US5253721ADirectional boring headSTRAIGHTLINE MANUFACTURING INC·Filed 1992·Granted Oct 19, 1993·65 cites·9 claims
- 0557US5709276AMulti-position directional drillSTRAIGHTLINE MANUFACTURING INC·Filed 1996·Granted Jan 20, 1998·38 cites·7 claims
- 0651US5231899ADrilling rig breakout wrench systemSTRAIGHTLINE MANUFACTURING INC·Filed 1992·Granted Aug 3, 1993·26 cites·10 claims
- 0743US4958689AMethod of providing a high pressure surge of working fluid to an underground percussive moleGAS RES INST·Filed 1989·Granted Sep 25, 1990·14 cites·1 claims
- 0841US4928775ADownhole surge valve for earth boring apparatusGAS RES INST·Filed 1988·Granted May 29, 1990·14 cites·3 claims
- 0931US2009000218A1Land rigLEE DOUGLAS WAYNE·Filed 2007·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →