DOUGLAS ENERGY COMPANY

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F03G SPRING, WEIGHT, INERTIA, OR LIKE MOTORS; MECHANICAL-POWER-PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR 415
 
  
 
B01D SEPARATION 3131
 
  
 
F01K STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES 127
 
  
 
F04D NON-POSITIVE-DISPLACEMENT PUMPS173

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6314738 Multistage two-phase turbineAug 18, 00Nov 13, 01[F03G]
6122915 Multistage two-phase turbineMay 03, 99Sep 26, 00[F03G]
6090299 Three-phase rotary separatorMay 12, 98Jul 18, 00[B01D]
5946915 Multistage two-phase turbineDec 06, 96Sep 07, 99[F03G]
5750040 Three-phase rotary separatorMay 30, 96May 12, 98[B01D]
5720799 Multistage two-phase turbineDec 06, 96Feb 24, 98[B01D]
5685691 Movable inlet gas barrier for a free surface liquid scoopJul 01, 96Nov 11, 97[F04D]
5664420 Multistage two-phase turbineJun 07, 95Sep 09, 97[F03G]
5525034 Hybrid two-phase turbineJan 26, 95Jun 11, 96[F01K]

Expired/Abandoned/Withdrawn Patents

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