| Patents for F04B 53 - Component parts, details or accessories not provided for in, or of interest apart from, groups or (19,443) |
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| 11/05/1991 | US5062452 Valve member and method of making such a member |
| 11/05/1991 | US5062451 Maximum flow single plug retention valve |
| 11/05/1991 | CA2041269A1 Piston assembly |
| 10/29/1991 | US5061159 Fluid end for reciprocating pump |
| 10/22/1991 | US5059101 Fluid end |
| 10/22/1991 | US5059099 Integral pump housing |
| 10/22/1991 | US5058779 Positive displacement piston metering pump |
| 10/08/1991 | US5054510 Selective valve to pass fluids |
| 10/02/1991 | EP0448906A2 Intensifier |
| 10/02/1991 | EP0448836A1 Piston pump |
| 10/01/1991 | US5052275 Horizontal reciprocating compressor with an eccentrically adjustable piston therein |
| 09/24/1991 | US5051072 Gas removable pump for liquid |
| 09/24/1991 | US5050895 High pressure dynamic seal |
| 09/24/1991 | US5050892 Sealing arrangement for piston in compressor |
| 09/24/1991 | CA1289598C Hydraulic pump with integrated sump and accumulator |
| 09/21/1991 | WO1991014517A1 A portable high-pressure cleaner |
| 09/21/1991 | CA2078430A1 Portable high-pressure cleaner |
| 09/19/1991 | DE4107952A1 Radial piston pump assembly - is activated by eccentric on rotatable shaft with support body between eccentric and piston |
| 09/18/1991 | EP0446898A2 A spring biased valve for use in a positive displacement volumetric pump |
| 09/18/1991 | EP0446454A1 Pump installation with a piston pump |
| 09/17/1991 | US5048604 Sucker rod actuated intake valve assembly for insert subsurface reciprocating pumps |
| 09/17/1991 | CA1289062C Pressure-operated valving for oil and gas well swabs |
| 09/16/1991 | CA2038287A1 Spring biased valve for use in a positive displacement volumetric pump |
| 09/10/1991 | US5046929 Seal compressor |
| 09/04/1991 | EP0444220A1 Hydraulic motor-pump unit |
| 09/03/1991 | CA1288284C Compact twin piston pump |
| 08/14/1991 | DE4102710A1 Illumination device for optical appts. - produces light beam with rectangular cross=section, using patterned disc to break up incident beam AB DE4102507A The illumination device is for an optical appts. The device produces a beam of rectangular cross-section and has a spherical auxiliary mirror (1). There is a first collector disc (3), a refracting disc (4) and a second collecting disc (5). The refracting disc (4) is transparent to the visible spectrum and has a flat surface on the light incident side (8). The light exit side (7) is formed with several flat surfaces (7a,7b,7c) of rectangular shape. The surfaces (7a) are parallel to the surface (8) whilst all the other surfaces are inclined to the surface (7a) at the same angle. The refractory disc (4) is so positioned that its light incident surface (8) is at right angles to the optical axis (9) of the light source (L). USE - Illumination of optical appts. AN 91246752 TI Solenoid-driven pump - has piston-mounted permanent magnets beyond which ends of stator core on rim of coil do not protrude in axial direction |
| 08/13/1991 | US5038673 High-pressure cleaning apparatus with a wobble plate piston pump |
| 08/08/1991 | WO1991011615A1 Piston pump |
| 08/08/1991 | DE4002263A1 Piston-cylinder unit with variable sealing element - used in metal pressure die casting machine |
| 08/06/1991 | US5037277 Poppet valve for a high pressure fluid pump |
| 08/06/1991 | US5037276 High pressure pump valve assembly |
| 08/01/1991 | DE4035755A1 Plastic piston head assembly - has cup seal held by retainer ring welded to piston flange underside |
| 08/01/1991 | DE4002452A1 Fuel pump for engine - has combination of membrane pump and piston pump driven via tappet |
| 07/31/1991 | EP0439327A1 A system and method for controlling a micro-pump |
| 07/30/1991 | US5035261 Pump and valve apparatus |
| 07/25/1991 | WO1991010830A1 Ultrahigh pressure plunger pump |
| 07/25/1991 | DE4001418A1 High pressure plunger pump - has outlet hoses connecting to accumulator and of same length |
| 07/23/1991 | US5033940 Reciprocating high-pressure compressor piston with annular clearance |
| 07/16/1991 | US5032063 Precision fluid pump |
| 07/11/1991 | DE4008255C1 Component for high pressure pumps, compressor etc. - has high tensile strength housing, forming trough-shaped retainer for plastics moulding, open to one side |
| 07/10/1991 | EP0380576A4 Compact twin piston pump |
| 07/09/1991 | US5030065 Reciprocating compressor |
| 07/09/1991 | CA1285863C Foot valve for pumping wells |
| 07/03/1991 | EP0435653A1 Micropump |
| 07/03/1991 | EP0435485A1 Device incorporating microporous membrane for venting gases from seal assembly of a reactor coolant pump |
| 06/26/1991 | EP0433649A1 Fluid metering pump |
| 06/19/1991 | EP0331683B1 Very high pressure piston pump |
| 06/18/1991 | US5024585 Housing coupling mechanism |
| 06/13/1991 | DE3943585A1 Membrane pump for delivery of metallic lacquer - use of externally removable inlet and outlet valves |
| 06/11/1991 | US5022312 Plastic piston head assembly |
| 06/05/1991 | EP0430636A2 Gas removable pump for liquid |
| 06/05/1991 | EP0429591A1 Improved micro-pump. |
| 06/04/1991 | US5020979 Injection pump having pilot and main injection |
| 05/28/1991 | CA2030493A1 Gas removable pump for liquid |
| 05/22/1991 | EP0427988A1 Membrane pump |
| 05/21/1991 | US5017105 Metering pump |
| 05/21/1991 | US5016669 Valve assembly |
| 05/08/1991 | DE3936729A1 Crank drive for high performance piston pump - involves method of ensuring reliable meshing of gears on two shafts |
| 05/07/1991 | US5013219 Positive displacement piston pump |
| 05/02/1991 | DE4034267A1 radial piston pump with hollow pistons - has arrangement of control chamber as polygon with radial bores |
| 04/30/1991 | US5011383 Valve assembly, for use in combination with a straight-cylinder, gas-compression chamber, and in combination therewith |
| 04/30/1991 | US5011382 Reciprocating piston pump |
| 04/30/1991 | US5011377 Swash-plate type piston pump motor |
| 04/24/1991 | EP0424087A1 Micro-pump or micro-discharge device |
| 04/18/1991 | WO1991005186A1 Multi-connecting rod reciprocating machine |
| 04/18/1991 | WO1991005163A1 Improved fluid-working machine |
| 04/17/1991 | WO1991005954A1 Pump apparatus |
| 04/17/1991 | CA2069340A1 Pump apparatus |
| 04/09/1991 | US5005296 Plotter and ink pressurizing pump |
| 04/03/1991 | EP0343163B1 High pressure cleaning apparatus with a wobble plate piston pump |
| 04/02/1991 | US5004403 Pressure responsive drivers for reciprocating pump and method |
| 03/27/1991 | EP0418881A1 Sealing for pistons in axial pistons machines |
| 03/26/1991 | US5001964 Pressurized fluid mechanism with two cubic capacities and closed circuit applying same |
| 03/21/1991 | WO1991003645A1 Primer valve for chop-check pump |
| 03/20/1991 | EP0417402A2 Membrane pump |
| 03/07/1991 | DE3928375A1 Piston pump with two pistons of different dia. - incorporates connecting channel to reduce pulsations |
| 03/06/1991 | EP0415259A1 Dosing pump |
| 03/06/1991 | EP0414955A1 High-pressure pump for cleaning-devices or the like |
| 03/05/1991 | US4997037 In a well pump system |
| 03/05/1991 | CA1280932C Displacement pump designed for cleaning |
| 02/26/1991 | US4995864 Dual chamber pumping apparatus |
| 02/21/1991 | WO1991002158A1 Pulseless piston pump |
| 02/21/1991 | DE4023961A1 One-piece pressure-cast aluminium pump housing - has initial hardened surface of limited depth worked to provide required extent of and surface finish for hardened region |
| 02/20/1991 | EP0413069A1 Dual chamber pumping apparatus |
| 02/19/1991 | US4993457 Housing arrangement for a fluid pump and tank |
| 02/15/1991 | CA2003402A1 Dual chamber pumping apparatus |
| 02/14/1991 | DE3926185A1 Compound roller bearing shell for radial piston machine - has roller bearing shell of steel, bronze and plastics layers with indented shape cooperating with piston |
| 02/12/1991 | US4991495 Pump-actuating mechanism |
| 02/05/1991 | US4990066 Metering pump |
| 02/05/1991 | US4990065 Plunger pump |
| 02/05/1991 | US4990054 Device incorporating micro-porous membrane for venting gases from seal assembly of a reactor coolant pump |
| 01/31/1991 | DE4001335C1 High-pressure plunger pump - incorporates adjustable sleeve and disc-types inlet valve |
| 01/30/1991 | EP0410824A1 Venting device of a pump inlet chamber |
| 01/30/1991 | EP0410545A1 High pressure fluid pump with poppet valve |
| 01/29/1991 | US4988147 Hydraulic high-pressure pump for a vehicle brake system |
| 01/29/1991 | US4988069 Stepping motor mounting |
| 01/18/1991 | WO1991001465A1 Combination air vent and overpressure valve |
| 01/18/1991 | CA2063836A1 Combination air vent and overpressure valve |
| 01/16/1991 | EP0408177A1 Check valve cartridges with controlled pressure sealing |