| Patents for F04C 25 - Adaptations for special use of pumps for elastic fluids (1,852) |
|---|
| 12/23/1992 | EP0519880A1 Inlet shut-off valve for rotary piston vacuum pump |
| 12/22/1992 | US5173041 Multistage vacuum pump with interstage solid material collector and cooling coils |
| 12/02/1992 | EP0515929A1 Vane vacuum pump |
| 10/20/1992 | US5156532 Rotary vane vacuum pump with shaft seal |
| 10/20/1992 | US5155908 Method for assembling a one-piece rotor system and a pump ring for a two-stage vacuum pump |
| 10/13/1992 | US5154592 Scroll type fluid apparatus with rotation restraining mechanism |
| 09/17/1992 | WO1992015786A1 Device for supplying a multi-stage dry-running vacuum pump with inert gas |
| 09/09/1992 | EP0502684A1 Rotary positive displacement pump |
| 09/09/1992 | EP0502459A2 Multi-shaft driving apparatus and fluid rotary apparatus |
| 09/08/1992 | US5145335 Low-noise vacuum pump |
| 08/20/1992 | WO1992014060A1 Dry-running twin-shaft vacuum pump |
| 08/20/1992 | WO1992014059A1 Dry-running vacuum pump |
| 08/12/1992 | EP0497995A1 Dry running vacuum pump |
| 07/21/1992 | US5131825 Multi-stage vacuum pump with reaction chamber between stages |
| 07/01/1992 | EP0492332A1 Vacuum pump with injection of dry gas |
| 06/17/1992 | CN2107622U Roots fan circulation wind energy-saving device |
| 06/02/1992 | US5118251 Compound turbomolecular vacuum pump having two rotary shafts and delivering to atmospheric pressure |
| 04/15/1992 | EP0480629A1 Improvements in mechanical pumps |
| 04/01/1992 | EP0477331A1 Manual device for generating local under or over pressure. |
| 03/31/1992 | US5100302 Quick disassembly system for rotary vacuum pumps |
| 03/25/1992 | EP0476631A1 Multistage vacuum pump |
| 03/11/1992 | EP0474066A1 Gas pumping apparatus by a liquid sealed vane pump and application to helium leakage detectors |
| 02/20/1992 | DE4026669C1 Mechanical vacuum pump - has cylindrical bore in housing with parallel inlet and outlet lines and rotor with spring-loaded vanes |
| 02/06/1992 | WO1991016133A3 Manual device for generating local under or over pressure |
| 12/04/1991 | EP0459116A1 Silent vacuum pump |
| 12/04/1991 | EP0459112A1 Rotary vane vacuum pump |
| 12/04/1991 | EP0459107A1 Vacuum vane pump and its method of oil supply |
| 12/04/1991 | EP0459092A1 Two stage vacuum pump and method for its construction |
| 12/03/1991 | US5069605 Scroll fluid machine having a sealing member radially inwardly of a thrust bearing |
| 10/18/1991 | WO1991016133A2 Manual device for generating local under or over pressure |
| 10/18/1991 | CA2060657A1 Manual device for generating local under or over pressure |
| 10/02/1991 | EP0448750A1 Multistage dry compressing vacuum pump and method for its operation |
| 09/24/1991 | CA1289479C Vacuum pump equipped with filter for the lubricating oil |
| 09/17/1991 | US5049050 Method for operating a twin shaft vacuum pump according to the Northey principle and a twin shaft vacuum pump suitable for the implementation of the method |
| 09/10/1991 | US5046934 Twin shaft vacuum pump with purge gas inlet |
| 08/20/1991 | US5040949 Two stage dry primary pump |
| 07/03/1991 | EP0435291A1 Combined turbomolecular vacuum pump with two shafts and discharge at atmospheric pressure |
| 06/11/1991 | US5022836 Sealing device for oil rotary vacuum pump |
| 05/28/1991 | US5018947 Screw type vacuum pump |
| 05/08/1991 | EP0426078A1 Method of operating a volumetric pump |
| 04/02/1991 | US5004407 Method of scavenging air and oil and gear pump therefor |
| 02/26/1991 | US4995797 Rotary screw vacuum pump with pressure controlled valve for lubrication/sealing fluid |
| 02/26/1991 | US4995796 Multi-section roots vacuum pump of reverse flow cooling type |
| 02/26/1991 | US4995794 Vacuum pumps |
| 02/13/1991 | EP0412948A2 Quick disassembly system for rotary vacuum pumps |
| 02/13/1991 | EP0412634A2 Sealing device for oil rotary vacuum pump |
| 02/05/1991 | US4990069 Multi-stage roots vacuum pump with sealing module |
| 01/29/1991 | CA1279622C2 Liquid ring vacuum pump |
| 01/23/1991 | EP0409287A1 Vacuum pump with displacement space |
| 01/15/1991 | US4984974 Screw type vacuum pump with introduced inert gas |
| 01/09/1991 | EP0406800A2 Vane vacuum pump with dosing device |
| 01/08/1991 | US4983107 Multistage rotary piston vacuum pump having sleeves to fix shaft positions |
| 01/08/1991 | US4983106 Rotary screw machine with multiple chambers in casing for lubrication-coding fluid |
| 12/12/1990 | EP0401741A1 Two stage primary dry pump |
| 11/15/1990 | DE4001668A1 Mehrstufige vakuumpumpe Multi-stage vacuum pump |
| 10/10/1990 | EP0391182A2 Vacuum pump |
| 10/09/1990 | CA1275091A1 Use of perfluoropolyethers in mechanical pumps |
| 09/18/1990 | US4957283 Vacuum system for feeding sheets |
| 08/28/1990 | CA1273327A1 Liquid ring vacuum pump |
| 07/24/1990 | US4943215 Multistage vacuum pump with bore for fouling removal |
| 07/18/1990 | CN2059465U High-speed rotor air pump for air horn |
| 07/10/1990 | US4940398 Twin-shaft, multiple-stage vacuum pump with the shafts vertically disposed |
| 06/26/1990 | US4936757 Multi-section vacuum pump |
| 05/30/1990 | EP0370117A1 Two-shaft vacuum pump and method of operation |
| 05/23/1990 | EP0302899B1 A method for producing pressure pulses in a mass of gas and a device for performing the method |
| 05/16/1990 | EP0368122A1 Multistage Roots vacuum pump |
| 05/08/1990 | US4923374 Method for producing pressure pulses in a mass of gas and a device for performing the method |
| 05/02/1990 | EP0365695A1 Positive displacement twin-shaft vacuum pump |
| 04/24/1990 | US4919598 Vacuum pumps |
| 04/17/1990 | US4917583 Bearing support for a twin-shaft pump |
| 04/11/1990 | EP0362865A2 Multi-section vacuum pump |
| 04/11/1990 | EP0362757A2 Rotary machine of the screw pump type |
| 03/21/1990 | EP0359423A2 Multi-section roots vacuum pump of reverse flow cooling type |
| 02/28/1990 | EP0355260A2 Screw type vacuum pump |
| 02/28/1990 | CN1007000B Dry-type vacuum pump |
| 12/26/1989 | US4889995 Apparatus for analysis employing electron |
| 11/01/1989 | CN1005642B Process for production of vaccum |
| 10/25/1989 | EP0338764A2 Vacuum pumps |
| 06/28/1989 | EP0321925A2 Apparatus for analysis employing electron |
| 06/21/1989 | EP0320956A2 Screw type vacuum pump |
| 05/10/1989 | CN2037403U Nonoil rotary sheet vacuum, pressure compound gas pump |
| 02/28/1989 | US4808095 Screw vacuum pump |
| 02/15/1989 | EP0302899A1 A method for producing pressure pulses in a mass of gas and a device for performing the method. |
| 01/10/1989 | US4797071 Motor and vane-pump assembly free from external oil leaks |
| 01/10/1989 | US4797068 Vacuum evacuation system |
| 12/14/1988 | CN87103739A Dry-type vacuum pump |
| 11/17/1988 | EP0290664A1 Two-shaft pump |
| 11/17/1988 | EP0290663A1 Single or multistage two-shaft vacuum pump |
| 11/17/1988 | EP0290662A1 Positive-displacement two-shaft vacuum pump |
| 11/16/1988 | CN87215922U Involute type rotor vaccum-pump |
| 11/15/1988 | CA1244914A1 Control for liquid ring vacuum pumps |
| 09/13/1988 | US4770609 Two-stage vacuum pump apparatus and method of operating the same |
| 08/30/1988 | US4767284 Screw vacuum pump unit |
| 06/28/1988 | US4753744 Use of perfluoropolyethers in mechanical pumps |
| 06/02/1988 | WO1988003995A1 A method for producing pressure pulses in a mass of gas and a device for performing the method |
| 06/01/1988 | DE3639512A1 Vacuum pump system with a Roots pump |
| 05/31/1988 | US4747761 Silencer-carrying rotary vane pump |
| 04/12/1988 | US4737073 Pump |
| 04/05/1988 | US4735559 Scroll-type vacuum pump with oil seal between suction and discharge chambers |
| 02/24/1988 | EP0256234A2 Vacuum generating system |