Patents
Sitemap › F04 - Positive-displacement machines for liquids; Pumps for liquids or elastic fluids › F04C - Rotary-piston, or oscillating-piston, positive-displacement machines for liquids; Rotary-piston, or oscillating-piston, positive-displacement pumps › F04C 18 - Rotary-piston pumps specially adapted for elastic fluids
Patents for F04C 18 - Rotary-piston pumps specially adapted for elastic fluids (19,462)
10/1999
10/06/1999CN1231022A Seal structure for casing
10/05/1999US5961306 Rotating scroll compressor having main and auxiliary rotating shaft portions
10/05/1999US5961302 Liquid-sealed vane oscillator
10/05/1999US5961297 Oil-free two stage scroll vacuum pump and method for controlling the same pump
10/05/1999US5960824 Scroll compressor having contoured fixed rotation suction control valve
09/1999
09/30/1999WO1999049220A1 Dry vacuum pump
09/30/1999WO1999049219A1 Screw rotor type wet vacuum pump
09/30/1999WO1999049217A1 Screw rotor for vacuum pumps
09/30/1999DE19812819A1 Screw compressor with mechanical slide ring shaft seal
09/29/1999CN2340950Y Miniature vacuum pump with two doctor blades oil sealer
09/29/1999CN2340949Y Vortex compressor with elastic positioning mechanism
09/29/1999CN1229887A Package-type scroll compressor
09/28/1999US5958614 Fuel cell generating set including lysholm compressor
09/28/1999US5957676 Rotary compressor with water miscible lubricant
09/28/1999CA2182446C Apparatus and method for electronically controlling inlet flow and preventing backflow in a compressor
09/22/1999EP0943806A1 Displacement type fluid machine
09/21/1999US5954489 Vane type vacuum pump having a pin drive coupling
09/21/1999US5954482 Compressor having pressure eliminating means
09/16/1999WO1999046507A1 A complex teeth-type gas compressor
09/15/1999EP0942172A1 Vacuum pump with multiple driven shafts
09/15/1999EP0941405A2 Fluid compressor
09/15/1999CN1228512A Helical blade type compressor and refrigeration cycle apparatus using the same
09/14/1999US5951273 Rotary compressor having a protective coating which is finish ground
09/14/1999US5951272 Scroll compressor having an annular seal for a stationary scroll pressure receiving surface
09/14/1999US5951269 Scroll compressor having well-balanced rotary elements
09/14/1999US5951268 Sperial vacuum pump having a metal bellows for limiting circular translation movement
09/14/1999US5951266 Evacuating apparatus having interengaging rotors with threads having a decreasing pitch at the exhaust side
09/14/1999US5950452 A refrigerant which does not include chlorine is used as a working fluid to be supplied to and discharged from the inside of cylinder chamber is useful for prevention of deterioration of oil in compressor
09/14/1999CA2088824C Capacity control mechanism for scroll-type compressor
09/10/1999WO1999045274A1 Scroll compressor with combined pressure ratio and pressure differential relief valve
09/07/1999US5947713 Pair of co-operating screw rotors, a screw rotor and a rotary screw machine
09/07/1999US5947711 Rotary screw air compressor having a separator and a cooler fan assembly
09/07/1999US5947710 Rotary compressor with reduced lubrication sensitivity
09/07/1999US5947709 Scroll compressor with oiling mechanism
09/07/1999US5947694 Scroll-type vacuum pumping apparatus
09/07/1999CA2148557C Variable scroll tip hardness
09/02/1999DE19907428A1 Vane wheel compressor for a vehicle air conditioning system
09/01/1999EP0939227A1 Scroll-type fluid machine in which a movable scroll member is elastically urged towards a fixed scroll member
09/01/1999CN2336115Y Arc rolling rotor type compressor
08/1999
08/31/1999US5944501 Roots blower having zigzag meandering grooves in the casing inner wall surface
08/31/1999US5944500 Scroll-type fluid displacement apparatus having a strengthened inner terminal end portion of the spiral element
08/26/1999WO1999042729A1 Vacuum pump
08/26/1999WO1999042728A1 Improved tip seal for scroll-type vacuum pump
08/26/1999WO1999034095B1 Vane restraint mechanism for axial-vane rotary device
08/26/1999DE19907492A1 Carbon dioxide compressor for air conditioning systems in which narrow oil passages are avoided
08/25/1999EP0937895A2 Screw fluid machine
08/25/1999EP0937894A2 Screw fluid machine and screw gear used in the same
08/25/1999CN1226640A Hermetic compressor
08/25/1999CN1226639A Scroll compressor
08/24/1999USRE36281 Valve system for capacity control of a screw compressor and method of manufacturing such valves
08/24/1999USRE36274 Method of manufacturing valve system for capacity control of a screw compressor
08/24/1999CA2114393C Electrochemical machining of scroll wraps
08/19/1999WO1999041503A1 Vacuum pump rotor and method of manufacturing the same
08/18/1999EP0936422A2 Apparatus having refrigeration cycle
08/18/1999CN1225982A Vortex disk of vortex-type refrigerating compressor
08/17/1999US5938419 Scroll fluid apparatus having an intermediate seal member with a compressed fluid passage therein
08/17/1999US5938418 Scroll type fluid displacement apparatus with decreased manufacturing cost
08/17/1999US5938417 Scroll type fluid machine having wraps formed of circular arcs
08/12/1999WO1999039621A1 Quiet vacuum cleaner using a vacuum pump with a lobed chamber
08/12/1999CA2320093A1 Quiet vacuum cleaner using a vacuum pump with a lobed chamber
08/11/1999EP0935106A2 Multi-stage compressing refrigeration device and refrigerator using the device
08/11/1999EP0935074A2 Rotation inhibiting mechanism for movable scroll of scroll type fluid machine
08/11/1999EP0934465A1 Rotor provided with shaft pivots
08/11/1999CN2332830Y Rolling rotor type compressor
08/11/1999CN2332829Y Compressor
08/11/1999CN1044633C Vortex hydraulic mechanism
08/05/1999WO1999039104A1 Variable displacement compressor
08/05/1999WO1999023528A3 Electrochromic system
08/04/1999EP0933532A2 Vane-type fluid machine
08/04/1999EP0933531A1 Scroll compressor
08/04/1999EP0933501A2 Rotation inhibiting mechanism for movable scroll of scroll type fluid machine
08/04/1999EP0932767A1 A screw compressor with adjustment slide means
08/03/1999US5931651 Scroll compressor and method for manufacturing an oldham ring therefor
08/03/1999US5931649 Motor compressor
07/1999
07/29/1999DE19800711A1 Mostly dry working screw spindle vacuum pump
07/28/1999CN2330812Y Twist-blade low-noise Roots blower
07/27/1999US5927958 Fluid machinery having a sealing member between stepped spirals
07/27/1999US5927863 Machine with bearing-mounted rotors and liquid-lubricated bearings
07/21/1999CN2329794Y Backpressure arc isolation vane rolling piston compressor
07/20/1999US5924856 Vane compressor having a movable pressure plate and a unitary front head and cam ring
07/20/1999US5924855 Screw compressor with cooling
07/14/1999CN1222652A Closed-type scroll compressor
07/14/1999CN1222651A Rotary fluid conveying machine
07/14/1999CN1222650A Check valve apparatus for scroll compressor
07/13/1999US5921273 Delivery valve assembly for compressor
07/13/1999US5920985 For a scroll fluid machine
07/13/1999CA2171643C Engaged rotor
07/08/1999WO1999034095A1 Vane restraint mechanism for axial-vane rotary device
07/06/1999US5919034 Scroll compressor and method for manufacturing an oldham ring therefor
06/1999
06/30/1999EP0926344A1 Seal structure for casing
06/30/1999EP0823025B1 Screw-type compressor with water hammer protection
06/30/1999CN1221477A Scroll type fluid machine
06/30/1999CN1221076A Scroll compressor with integral outer housing and fixed scroll member
06/29/1999US5915933 Rotation preventing mechanism for fluid displacement apparatus
06/24/1999WO1999031355A1 Improved scroll compressor assembly
06/23/1999EP0924433A1 Scroll-type compressor
06/23/1999EP0924432A1 Swing-link mechanism of a scroll-type compressor
06/23/1999EP0924431A1 Scroll compressor
06/23/1999EP0924430A1 Closed-type scroll compressor
06/23/1999EP0924429A1 Scroll compressor
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