| Patents for F04C 25 - Adaptations for special use of pumps for elastic fluids (1,852) |
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| 09/30/1999 | WO1999049217A1 Screw rotor for vacuum pumps |
| 09/15/1999 | EP0942172A1 Vacuum pump with multiple driven shafts |
| 09/14/1999 | US5951268 Sperial vacuum pump having a metal bellows for limiting circular translation movement |
| 09/07/1999 | US5947694 Scroll-type vacuum pumping apparatus |
| 08/26/1999 | WO1999042729A1 Vacuum pump |
| 08/26/1999 | WO1999042728A1 Improved tip seal for scroll-type vacuum pump |
| 08/25/1999 | EP0937895A2 Screw fluid machine |
| 08/25/1999 | EP0937894A2 Screw fluid machine and screw gear used in the same |
| 08/11/1999 | CN2332832Y Translational fluid multipupose pump |
| 08/11/1999 | CN2332831Y 真空泵 Vacuum pump |
| 07/28/1999 | EP0931938A1 Vacuum pump with dust collecting function |
| 06/09/1999 | EP0839283B1 Oil-sealed vane-type rotary vacuum pump with oil feed |
| 06/09/1999 | EP0839282B1 Oil-sealed vane-type rotary vacuum pump with an oil pump |
| 05/25/1999 | US5906055 Heat generation through mechanical molecular gas agitation |
| 05/18/1999 | US5904473 Vacuum pump |
| 04/22/1999 | WO1999019631A1 Screw vacuum pump provided with rotors |
| 04/22/1999 | WO1999019630A1 Cooled screw vacuum pump |
| 04/21/1999 | CN2315335Y Blade vacuum pump |
| 04/15/1999 | DE19745616A1 Cooling system for helical vacuum pump |
| 04/15/1999 | DE19745615A1 Screw vacuum pump with rotors |
| 03/31/1999 | EP0904494A1 Scroll-type vacuum pumping apparatus |
| 03/10/1999 | EP0900940A2 Method of operating a vacuum pump |
| 03/09/1999 | US5879138 Two-stage rotary vane vacuum pump |
| 02/24/1999 | CN1208819A Double roll and dry type scroll vacuum pump |
| 02/17/1999 | CN2307935Y Two-stage claw-type rotor vacuum pump |
| 02/16/1999 | US5871338 Vacuum pump with a gas ballast device |
| 02/10/1999 | CN2307126Y Vacuum liquid circulating pump |
| 02/03/1999 | EP0894978A1 Double-wrap dry scroll vacuum pump |
| 01/13/1999 | EP0663986B1 Dry-compression vacuum pump |
| 01/06/1999 | CN2303100Y Two side oil-free swirl vacuum pump |
| 01/05/1999 | US5855473 High displacement rate,scroll-type, fluid handling apparatus |
| 12/17/1998 | WO1998057067A1 Screw spindle vacuum pump and operating method |
| 12/17/1998 | DE19724643A1 Schraubenverdichter und Verfahren zum Betrieb desselben The same screw-type compressor and method of operating |
| 12/09/1998 | EP0882892A1 Scroll type machine |
| 12/08/1998 | US5846066 Vacuum pumps with claw-type rotor and roots-type rotor near the outlet |
| 12/08/1998 | US5846062 Two stage screw type vacuum pump with motor in-between the stages |
| 11/17/1998 | US5836754 Screw fluid machine and screw gear used in the same |
| 11/17/1998 | US5836746 Vacuum pump having lubrication and cooling systems |
| 11/03/1998 | US5829957 Screw fluid machine and screw gear used in the same |
| 10/28/1998 | EP0874158A1 Vacuum pump with shaft seal |
| 09/01/1998 | US5800151 Method of generating a transverse tooth profile of a screw rotor |
| 08/27/1998 | WO1998037327A1 Two stage vacuum pumping apparatus |
| 08/27/1998 | CA2252755A1 Two stage vacuum pumping apparatus |
| 08/26/1998 | CN1191593A Oil-sealed vane-type rotary vacuum pump with oil pump |
| 08/26/1998 | CN1191592A Oil-sealed vane-type rotary vacuum pump with oil feed |
| 08/12/1998 | EP0857876A2 Method and apparatus to control the suction capacitiy of vacuum pumps |
| 07/21/1998 | US5782609 Vacuum pump having different diameter rotors and a drive motor synchronization system |
| 07/08/1998 | EP0851980A1 Rotary vane pump |
| 05/12/1998 | US5749716 Integrated oil pump rotor and coupling piece for an oil-sealed vacuum pump |
| 05/06/1998 | EP0839283A1 Oil-sealed vane-type rotary vacuum pump with oil feed |
| 05/06/1998 | EP0839282A1 Oil-sealed vane-type rotary vacuum pump with an oil pump |
| 05/05/1998 | US5746581 Method and apparatus for evacuating vacuum system |
| 04/29/1998 | EP0838012A1 Refrigerator or heat pump with a pulse tube operated by a pressure generator |
| 04/28/1998 | US5743719 Oil-free scroll vacuum pump having a gas ballast part |
| 04/08/1998 | EP0834017A1 Vacuum pump |
| 03/25/1998 | EP0711386B1 Oil-sealed vacuum pump |
| 03/11/1998 | EP0828332A1 Vacuum pump status evaluation system |
| 02/17/1998 | US5718565 Apparatus and process for operating a dry-compression vacuum pump |
| 12/16/1997 | US5697772 Screw rotor and method of generating tooth profile therefor |
| 12/16/1997 | US5697771 Vacuum pump with oil separator |
| 12/10/1997 | EP0811766A2 Displacement type vacuum pump |
| 10/21/1997 | US5678759 In a vacuum pressure system |
| 10/09/1997 | DE19606465C1 Emptying especially bottles or cans |
| 10/07/1997 | US5674063 Screw fluid machine and screw gear used in the same |
| 10/07/1997 | US5674051 Positive displacement pump having synchronously rotated non-circular rotors |
| 10/01/1997 | EP0798463A2 Oil-free scroll vacuum pump |
| 09/16/1997 | US5667370 Screw vacuum pump having a decreasing pitch for the screw members |
| 09/10/1997 | CN2262122Y Slide-valve vacuum pump |
| 09/10/1997 | CN2262121Y Slide-valve mechanical vacuum pump |
| 09/03/1997 | EP0793021A1 Vacuum pumps |
| 08/26/1997 | US5660535 Method of operating a claw-type vacuum pump and a claw-type vacuum pump suitable for carrying out the method |
| 08/13/1997 | EP0788402A1 An arrangement in autoclaving systems |
| 08/05/1997 | US5653582 Fluid bearing pad arrangement for liquid ring pump systems |
| 07/09/1997 | EP0711387B1 Vacuum pump with a gas ballast device |
| 06/25/1997 | EP0780576A2 Scroll fluid apparatus |
| 06/11/1997 | CN1151486A Cooling device for oil-sealed rotary vacuum pump |
| 05/21/1997 | EP0714482B1 Vacuum pump with oil separator |
| 05/14/1997 | EP0711384B1 Two-stage slide vane vacuum pump |
| 05/14/1997 | EP0663045B1 Method of operating a claw-type vacuum pump, and a claw-type vacuum pump suitable for carrying out the method |
| 05/13/1997 | US5628194 Process for pumping gaseous helium at cryogenic temperatures by a positive displacement pump |
| 05/06/1997 | US5626469 Scroll apparatus |
| 04/24/1997 | DE19539035A1 Rotary positive displacement pump for laboratory and motor vehicle use |
| 04/16/1997 | EP0708715A4 Heat generation through mechanical molecular agitation |
| 04/02/1997 | EP0766006A2 Liquid ring pump with rotating liner |
| 04/02/1997 | CN2251056Y Oilles rotary-vane vacuum pump |
| 04/01/1997 | US5616015 High displacement rate, scroll-type, fluid handling apparatus |
| 03/27/1997 | WO1997011277A1 Rotary vane pump |
| 03/27/1997 | CA2185756A1 Fluid bearing pads |
| 02/26/1997 | CN1143719A Method for pumping high-vacuum degree |
| 02/19/1997 | CN1143166A Vacuum pump |
| 02/06/1997 | WO1997004236A1 Oil-sealed vane-type rotary vacuum pump with oil feed |
| 02/06/1997 | WO1997004235A1 Oil-sealed vane-type rotary vacuum pump with an oil pump |
| 01/30/1997 | WO1997003327A1 Refrigerator or heat pump with a pulse tube operated by a pressure generator |
| 01/23/1997 | DE19526321A1 Ölgedichtete Drehschiebervakuumpumpe mit Ölpumpe Oil sealed rotary vane vacuum pump with oil pump |
| 01/23/1997 | DE19526303A1 Ölgedichtete Drehschiebervakuumpumpe mit einer Ölversorgung Oil sealed rotary vane vacuum pump with an oil supply |
| 01/22/1997 | EP0754860A2 Oil-free scroll vacuum pump |
| 01/22/1997 | CN1140805A Rotary vane type hydraulic machines |
| 01/21/1997 | US5595477 Vacuum pumping stand |
| 01/09/1997 | WO1997001037A1 Vacuum pump |
| 01/02/1997 | DE19522554A1 Compressor operative chamber surface cleaning method |