| Patents for F04B 9 - Piston machines or pumps characterised by the driving or driven means to or from their working members (9,236) |
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| 10/09/1991 | CN2086321U Hand pump for liquid vent with positive pressure |
| 10/09/1991 | CN2086320U Pressurizing inflator |
| 10/09/1991 | CN1014254B Multipurpose hydraulic transmission piston pump |
| 10/08/1991 | US5055008 Proportionating pump for liquid additive metering |
| 10/08/1991 | US5055001 Volumetric pump with spring-biased cracking valves |
| 10/02/1991 | EP0448937A2 Hose pump |
| 10/02/1991 | EP0448906A2 Intensifier |
| 10/02/1991 | EP0448836A1 Piston pump |
| 10/02/1991 | CN1014140B Multi-channel linear concentrate pump |
| 09/25/1991 | CN2085429U Reciprocating hand high pressure pump with dual-cylinders |
| 09/25/1991 | CN2085428U Portable pump |
| 09/25/1991 | CN2085427U Pedal water pump |
| 09/25/1991 | CN2085426U Pistol type negative pressure pump |
| 09/25/1991 | CN2085425U Pressure limited dispaly floating type inflater with dual-tube |
| 09/24/1991 | US5050482 Apparatus for driving piston by fluid pressure |
| 09/19/1991 | WO1991013689A1 Applicator for media |
| 09/19/1991 | DE4017062C1 Radial piston hydraulic machine - incorporates push-rods connecting pistons to chain rollers |
| 09/19/1991 | DE4008068A1 Austragvorrichtung fuer medien Discharge for media |
| 09/18/1991 | EP0446897A2 Volumetric pump with spring-biased cracking valves |
| 09/18/1991 | EP0446331A1 Piston pump and piston pump and motor assembly. |
| 09/18/1991 | EP0261180B1 Anti-contamination flow control in liquids |
| 09/17/1991 | US5049038 Fluid compressors |
| 09/17/1991 | CA1289110C Manually actuated dispensing pump |
| 09/16/1991 | CA2038286A1 Volumetric pump with spring-biased cracking valves |
| 09/10/1991 | US5046929 Seal compressor |
| 09/10/1991 | US5046486 Compact pulsing pump for irrigation handpiece |
| 09/04/1991 | EP0444387A1 A device for the electrical or manual operation of hydraulic actuators |
| 08/28/1991 | EP0443665A1 Pressure pump |
| 08/28/1991 | CN2083645U Domestic heating automatic circulating pump |
| 08/28/1991 | CN2083644U Vacuum flow guiding transfusion apparatus |
| 08/24/1991 | CA2036182A1 Peristaltic pump |
| 08/21/1991 | CN2083202U Hand-driven displacement pump |
| 08/21/1991 | CN2083201U Hand operated simple piston pump |
| 08/20/1991 | US5041132 Blood pump |
| 08/14/1991 | CN2082772U Pedal lift pump |
| 08/14/1991 | CN2082771U Hand press water pump |
| 08/13/1991 | US5039283 Device for anti-skid brake system |
| 08/13/1991 | US5039281 Method and apparatus for supplying compressed air to auxiliary systems of a vehicle |
| 08/07/1991 | EP0440526A1 Apparatus for driving piston by fluid pressure |
| 08/07/1991 | CN2082320U Liquid pump of piston type |
| 08/07/1991 | CN2082319U Recipracating type pneumatic thick liquid carriage pump |
| 08/07/1991 | CN1053663A Oil filler for automobiles |
| 08/01/1991 | DE4002578A1 High pressure water pump - has three-piston pump pistons connected to pump drive |
| 07/31/1991 | CN2081901U Piston-type suction drainage apparatus |
| 07/31/1991 | CN2081900U Telescopic high-pressure inflator |
| 07/24/1991 | CN2081442U Automobile fueller |
| 07/24/1991 | CN2081439U Pull rod oil suction unit |
| 07/24/1991 | CN2081438U Liquid suction |
| 07/17/1991 | EP0437139A1 Precompression dosing pump |
| 07/17/1991 | EP0437131A1 Precompression hand pump for the spraying of a liquid, in particular a perfume |
| 07/17/1991 | CN2080997U High-pressure hand-pump for deep well |
| 07/17/1991 | CN1053109A Vertical reciprocating pump |
| 07/16/1991 | US5032063 Precision fluid pump |
| 07/16/1991 | US5032058 Calibrated fluid injection system |
| 07/11/1991 | CA2033518A1 Prepressurized manual pump for spraying of a liquid, a perfume for example |
| 07/10/1991 | EP0435924A1 Snap-in trigger. |
| 07/10/1991 | CN2080573U 农用水泵 Agricultural pumps |
| 07/10/1991 | CN2080572U Hydraulic motor with radial plunger having cam-rollers |
| 07/10/1991 | CN1052767A Compressed sprayer in additional use for inflator |
| 07/09/1991 | US5030069 Material moving pump |
| 07/09/1991 | US5030065 Reciprocating compressor |
| 07/09/1991 | CA2033736A1 Precompression metering pump |
| 07/09/1991 | CA1285821C Pump control system |
| 07/03/1991 | EP0435196A1 Pressure converting device |
| 06/27/1991 | CA2029167A1 Method and apparatus for supplying compressed air to auxiliary systems of a vehicle |
| 06/26/1991 | EP0433969A1 Arrangement on a pump unit |
| 06/26/1991 | EP0433649A1 Fluid metering pump |
| 06/26/1991 | CN2079669U Refuelling tube for car |
| 06/20/1991 | DE3942223C1 Piston-cylinder for electrical switching drive unit - has piston driven against spring by eccentric to off set piston axis w.r.t. eccentric centre point |
| 06/20/1991 | DE3941430A1 Measurement and dispensing appts. for various media - has piston unit with medium reservoir and displacement sensor feeding valve controller |
| 06/18/1991 | US5024584 Pump unit with adjustable piston stroke length |
| 06/12/1991 | EP0431497A2 Double-acting spraying and/or dosing hand pump |
| 06/06/1991 | DE3939780A1 Heat pump or refrigeration circuit - has crank used to operate offset piston providing asymmetrical movement |
| 06/05/1991 | EP0429591A1 Improved micro-pump. |
| 06/05/1991 | CN2078383U Hand-operated double-chamber self-sucking water pump |
| 06/04/1991 | US5020974 Fluid compressors |
| 05/22/1991 | EP0428406A1 Reciprocating actuator |
| 05/22/1991 | EP0427798A1 Apparatus for and method of managing liquid under pressure. |
| 05/22/1991 | CN2077491U Manual liquid sucker |
| 05/16/1991 | WO1991006761A1 Piston pump |
| 05/15/1991 | CN2077040U 储能水泵 Pump storage |
| 05/15/1991 | CN2077039U Fully-closed inflator |
| 05/15/1991 | CN2077038U Dual-cylinder hand pressure pump |
| 05/14/1991 | US5014882 Pivot-action portioning apparatus and method |
| 05/14/1991 | US5014881 Metering and spray pump for liquid and low-viscosity substances |
| 05/08/1991 | EP0425636A1 Food dispensing method and apparatus and metering device therefor |
| 05/08/1991 | CN2076615U Differential plunger mud pump |
| 05/07/1991 | US5013218 Submersible pneumatic pump for water table |
| 05/07/1991 | US5012643 Pressure-driven engine |
| 05/02/1991 | EP0425113A1 Fluid compressors |
| 04/24/1991 | CN2075712U Siphon-pump |
| 04/24/1991 | CN2075710U Sleeve piston type inflater |
| 04/23/1991 | US5009638 Breast pump |
| 04/21/1991 | CA2027222A1 Calibrated fluid injection system |
| 04/18/1991 | WO1991005186A1 Multi-connecting rod reciprocating machine |
| 04/18/1991 | WO1991005164A1 Piston pump and piston pump and motor assembly |
| 04/18/1991 | DE3933445A1 Twin piston high pressure pump aggregate - makes use of sensors to determine stroke sequence |
| 04/17/1991 | EP0422745A1 Concrete-pumping device |
| 04/17/1991 | CN2075260U Multifunctional hand press type lift pump for farm |
| 04/16/1991 | US5007812 Hydraulic pump with pulsating high and low pressure outputs |