| Patents for F04C 19 - Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids (784) |
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| 08/10/1993 | CA1321177C Sealing and dynamic operation of a liquid ring pump |
| 07/28/1993 | EP0552940A1 Liquid ring pumps with rotating lobe liners |
| 07/28/1993 | CN2139184Y Steam pumping vacuum machine |
| 07/23/1993 | CA2087331A1 Bearing fluid distribution systems for liquid ring pumps with rotating lobe liners |
| 06/29/1993 | US5222869 Liquid ring vacuum pump-compressor with rotor cone clearance concentrated in the seal segment |
| 06/23/1993 | EP0547436A1 Liquid ring pump |
| 06/08/1993 | US5217352 Two-stage liquid ring pump with rotating liner in first stage supported by liquid from second stage |
| 05/25/1993 | US5213479 Liquid ring pumps with improved housing shapes |
| 05/18/1993 | US5211543 Liquid-ring pump with pressure chamber valve plate |
| 03/30/1993 | US5197863 Bearing fluid distribution systems for liquid ring pumps with rotating lobe liners |
| 03/17/1993 | CN2128316Y Liquid ring type chlorine pump |
| 02/18/1993 | WO1993003281A1 Control unit for a liquid ring compressor |
| 02/11/1993 | DE4126322A1 Steuerkoerper fuer einen fluessigkeitsringverdichter Steuerkoerper for a fluessigkeitsringverdichter |
| 01/21/1993 | WO1993001396A1 Cooling apparatus for recirculating vacuum pump compressant |
| 01/21/1993 | DE4123938A1 Liquid ring vacuum pump - has pressure medium fed directly to slide ring seal chamber and vane chamber |
| 12/24/1992 | DE4118787A1 Prozessintegriertes betriebsfluessigkeitsreinigungssystem fuer verdichter Integrated process betriebsfluessigkeitsreinigungssystem for compressors |
| 12/23/1992 | EP0519192A1 Liquid ring pump |
| 12/10/1992 | WO1992021432A1 Process for continuously cleaning the auxiliary or working liquid of a compressor |
| 12/09/1992 | EP0517277A1 Liquid ring gas pump with overhanging impeller |
| 11/26/1992 | WO1992020925A1 Multiple flow, liquid ring pump |
| 11/18/1992 | CA2068812A1 Liquid-ring pump |
| 07/28/1992 | CA1305690C Two stage liquid ring pump |
| 07/09/1992 | WO1992011458A1 A suspension pump with built-in vacuum pump |
| 07/08/1992 | EP0494041A1 Liquid ring pump |
| 07/01/1992 | EP0492792A1 Liquid ring pumps having rotating lobe liners with end walls |
| 06/29/1992 | CA2055956A1 Liquid ring pumps having rotating lobe liners with end walls |
| 06/16/1992 | US5122035 Liquid ring compressor |
| 05/27/1992 | EP0486726A1 Liquid ring pump |
| 03/31/1992 | US5100300 Liquid ring pumps having rotating lobe liners with end walls |
| 03/18/1992 | EP0474697A1 Improvements in or relating to liquid ring machines. |
| 03/17/1992 | US5096386 Integral liquid ring and regenerative pump |
| 03/11/1992 | EP0474476A2 Rotary pump |
| 02/12/1992 | EP0470459A1 Compressor |
| 01/22/1992 | EP0467011A1 Liquid ring pump with magnetic coupling |
| 01/07/1992 | US5078573 Liquid ring pump having tapered blades and housing |
| 12/26/1991 | WO1991019904A1 Rotary fluid pumping apparatus |
| 12/17/1991 | US5073089 Liquid-ring compressor |
| 10/29/1991 | CA1291464C Self-priming liquid ring pump methods and apparatus |
| 09/07/1991 | CA2011636A1 Molten metal pump |
| 08/27/1991 | US5043079 Passing through liquid ring compressor |
| 07/24/1991 | EP0437637A1 Liquid ring pump |
| 07/16/1991 | US5032056 Fluid compressor |
| 05/30/1991 | WO1991007592A1 Integral liquid ring and regenerative pump |
| 05/16/1991 | WO1991006778A1 Regenerative pump and method discharging pressurized fluid therefrom |
| 05/16/1991 | WO1991006748A1 Regenerative pump and method of introducing fluid thereto |
| 04/23/1991 | US5009782 Liquid separator integrated into a pressure chamber housing abutting a liquid ring pump |
| 04/10/1991 | EP0420886A1 Liquid ring compressor. |
| 02/12/1991 | US4992028 Liquid ring pump |
| 01/29/1991 | CA1279622C2 Liquid ring vacuum pump |
| 01/16/1991 | EP0408366A2 Wastewater treatment process with an ozone contactor |
| 01/14/1991 | CA2020949A1 Wastewater treatment process with an ozone contactor |
| 12/13/1990 | WO1990015250A1 Improvements in or relating to liquid ring machines |
| 12/12/1990 | EP0401397A1 Liquid-ring compressor |
| 12/05/1990 | CA2018032A1 Liquid-ring compressor |
| 10/30/1990 | CA1275573C Method and apparatus for increasing the operating efficiency of a liquid-flow machine |
| 10/17/1990 | EP0392034A1 Liquid ring pump with a liquid separator integral with the side cover |
| 09/25/1990 | CA1274496A1 Liquid ring compressors |
| 08/28/1990 | CA1273327A1 Liquid ring vacuum pump |
| 08/07/1990 | US4946349 Water ring vacuum pump |
| 05/16/1990 | EP0367845A1 Liquid ring pump |
| 05/10/1990 | DE3935247A1 Liq. ring pump system - has arrangement of short length ballast gas calibration pipe |
| 05/08/1990 | CA1268748A1 Liquid ring vacuum pump arrangement having minimized operating liquid consumption |
| 12/20/1989 | CN1006179B 泵 Pump |
| 12/14/1989 | WO1989012168A1 Liquid ring compressor |
| 11/30/1989 | DE3817432A1 Method for preventing the freezing of liquid ring vacuum pumps or the like |
| 11/28/1989 | US4883410 Fuel supply systems |
| 10/25/1989 | EP0338695A2 Improvements relating to gas and/or vapour compressors |
| 10/05/1989 | DE3809929A1 Liquid ring vacuum pump |
| 09/20/1989 | EP0333045A1 Vacuum sewage conveying system |
| 07/26/1989 | EP0325354A1 Aircraft fuel supply system |
| 07/25/1989 | US4850808 Liquid ring pump having port member with internal passageways for handling carry-over gas |
| 06/27/1989 | US4842486 Method and apparatus for increasing the operating efficiency of a liquid-flow machine |
| 04/04/1989 | US4817265 Method for the manufacture of a control disc or a control shield for a liquid-ring machine |
| 01/25/1989 | EP0183813B1 Compressor unit with liquid ring |
| 01/05/1989 | DE3720903A1 Fluid pump operating system - warming and degassing fluid before leaving pump |
| 01/03/1989 | US4795315 Two-stage liquid ring pump |
| 12/15/1988 | DE3711121A1 Water-ring pump |
| 12/14/1988 | EP0294652A2 Liquid ring machine |
| 11/15/1988 | CA1244914A1 Control for liquid ring vacuum pumps |
| 10/27/1988 | DE3744723A1 Water-ring pump |
| 08/24/1988 | EP0279292A1 Liquid separator |
| 07/21/1988 | DE3448123C2 Precipitator, in particular for liquid-ring vacuum pumps or the like |
| 07/13/1988 | EP0274272A2 Two stage liquid ring pump |
| 07/12/1988 | US4756672 Liquid-ring pump with maintenance of liquid level |
| 07/05/1988 | US4755107 Liquid-ring pump having additional openings in control disc for warm and cold liquid |
| 05/31/1988 | US4747752 Sealing and dynamic operation of a liquid ring pump |
| 04/12/1988 | US4737073 Pump |
| 02/23/1988 | CA1233149A1 Noise control for conically ported liquid ring pumps |
| 02/23/1988 | CA1233148A1 Liquid ring pump with conical or cylindrical port member |
| 01/12/1988 | US4718834 Method and apparatus for conveying gas |
| 12/01/1987 | US4710105 Liquid-ring compressor unit |
| 11/25/1987 | EP0246782A2 Self-priming liquid ring pump methods and apparatus |
| 11/19/1987 | EP0245626A2 Liquid-ring machine |
| 09/08/1987 | US4692101 Liquid ring vacuum pump arrangement having minimized operating liquid consumption |
| 08/12/1987 | EP0231775A1 Liquid ring machine |
| 08/11/1987 | US4685865 Liquid ring compressor having openings in housing for emptying liquid during stoppage |
| 07/29/1987 | EP0229970A1 Method and apparatus for the operation of liquid flow machines |
| 07/14/1987 | US4679987 Self-priming liquid ring pump methods and apparatus |
| 07/14/1987 | CA1224083A1 Reversible unidirectional flow rotary pump |
| 05/27/1987 | CN86205327U Chute blade compressor with rotary seal rack |