Douglas B. Owen

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Rochester, MI, US

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Patents Grantslast 30 patents

Information Patent Grant
Fluid transfer module with multiple flow paths
- Patent number 4,759,571
- Issue date Jul 26, 1988
- D. W. Zimmerman Mfg., Inc.
- Charles W. Stone
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
Pressure-operated valve, particularly for a downhole pump
- Patent number 4,674,959
- Issue date Jun 23, 1987
- D. W. Zimmerman Mfg., Inc.
- Albert D. Fox
- E21 - EARTH DRILLING MINING
Information Patent Grant
Downhole pump with check valve
- Patent number 4,478,558
- Issue date Oct 23, 1984
- D. W. Zimmerman Mfg., Inc.
- Douglas B. Owen
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Fluid driven successive stage bladder pump
- Patent number 4,468,175
- Issue date Aug 28, 1984
- D. W. Zimmerman Mfg., Inc.
- Douglas B. Owen
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Liquid pump with flexible bladder member
- Patent number 4,439,113
- Issue date Mar 27, 1984
- D. W. Zimmerman Mfg., Inc.
- Douglas B. Owen
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Fluid driven successive stage bladder pump
- Patent number 4,360,320
- Issue date Nov 23, 1982
- D. W. Zimmerman Mfg., Inc.
- Douglas B. Owen
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...