Patents
Patents for F04C 23 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids (6,201)
04/1991
04/10/1991EP0420899A1 Multi-stage vacuum-pump set
04/10/1991EP0420853A1 Vacuum pump unit arranged on a transportable support frame
04/09/1991US5006051 Rotary two-cylinder compressor with delayed compression phases and oil-guiding bearing grooves
03/1991
03/27/1991CN1012201B Scroll compressor
03/26/1991US5002470 Internal stator rolling rotor motor driven scroll compressor
03/19/1991US5000669 Hermetic scroll type compressor having two section chambers linked by inclined oil passage
02/1991
02/27/1991CN1011811B Scroll type compressor
02/26/1991US4995796 Multi-section roots vacuum pump of reverse flow cooling type
02/26/1991US4995789 Enclosed type electric compressor
02/19/1991US4993929 Scroll machine with lubricated thrust surfaces
02/13/1991EP0412948A2 Quick disassembly system for rotary vacuum pumps
02/12/1991US4992033 Scroll-type machine having compact Oldham coupling
02/05/1991US4990073 Two-cylinder rotary compressor having improved valve cover structure
01/1991
01/23/1991EP0409287A1 Vacuum pump with displacement space
12/1990
12/19/1990EP0403239A2 Capacity controllable compressor apparatus
12/19/1990EP0402577A1 Compressor mounting apparatus
12/12/1990EP0401968A2 A rotary compressor
12/12/1990EP0401741A1 Two stage primary dry pump
12/06/1990DE4016014A1 Sliding vane vacuum pump - has outlet valve mounted in plane of joint face of rotor housing
12/04/1990USRE33473 Oil feeding device for scroll fluid apparatus
11/1990
11/20/1990US4971529 Twin rotary compressor with suction accumulator
11/06/1990US4968232 Axial sealing mechanism for a scroll type compressor
11/06/1990US4968228 Housing for horizontal rolling piston rotary compressor
10/1990
10/23/1990US4964786 Compressor mounting apparatus
10/23/1990US4964609 Compressor mounting apparatus
10/02/1990US4960371 Rotary compressor for heavy duty gas services
09/1990
09/27/1990DE3909831A1 Sliding-vane rotary pump designed for dry running, and method for manufacturing it
09/25/1990US4958993 Scroll compressor with thrust support means
09/25/1990CA1274495A1 Rotary compressor with vane slot pressure groove
09/25/1990CA1274494A1 Rotary compressor lubrication arrangement
09/18/1990US4957417 Vertical oilless screw vacuum pump
09/18/1990US4957283 Vacuum system for feeding sheets
09/04/1990US4954057 Scroll compressor with lubricated flat driving surface
08/1990
08/16/1990EP0381790A1 Method and device for the compression of a gaseous medium
08/01/1990EP0380439A2 Scroll compressor with axial compliancy
07/1990
07/25/1990EP0379011A2 Pumping unit
07/24/1990US4943215 Multistage vacuum pump with bore for fouling removal
07/23/1990CA2005935A1 Scroll compressor with axial compliancy
07/11/1990CN1008760B Hermetically sealed rotary compressor
07/10/1990US4940398 Twin-shaft, multiple-stage vacuum pump with the shafts vertically disposed
07/10/1990US4940396 Hermatic scroll type compressor with two casings and center blocks
07/03/1990US4938669 Scroll compressor with axial compliancy
06/1990
06/26/1990US4936757 Multi-section vacuum pump
06/26/1990US4936756 Hermetic scroll type compressor with refrigerant fluid flow through the drive shaft
06/26/1990CA1270696A1 Combined fluidizing and vacuum pump
06/19/1990USRE33236 Bearing device of sealed type scroll compressor
06/19/1990US4934910 Scroll-type fluid apparatus with radially compliant driving means
06/19/1990US4934908 Vacuum pump systems
06/13/1990CN1008389B Compressor
06/12/1990US4932211 Internal combustion engine charging unit
06/06/1990CN2057969U Automotive double-shaft air pump
05/1990
05/29/1990US4929160 Scroll compressor having exhausting pipe pressed into muffler chamber under pressure
05/22/1990US4926642 Internal combustion engine charging unit
05/16/1990EP0368124A1 Multistage Roots pump and its assembly method
05/08/1990CA1268748A1 Liquid ring vacuum pump arrangement having minimized operating liquid consumption
04/1990
04/25/1990EP0365132A2 Scroll compressor
04/19/1990WO1990004107A1 Machine for a gaseous medium
04/12/1990DE3932862A1 Hermetic seal construction for coolant in domestic refrigerator - features rotary piston in coolant compressor divided into three regions with different functions
04/11/1990EP0362865A2 Multi-section vacuum pump
04/10/1990US4915554 Hermetic rotary compressor with balancing weights
03/1990
03/28/1990EP0360048A2 Installation for producing transport air
03/27/1990US4911620 Scroll compressor top cover plate
03/21/1990EP0359423A2 Multi-section roots vacuum pump of reverse flow cooling type
03/08/1990DE3828608A1 Vacuum-pump device
02/1990
02/21/1990CN2053260U Compressor with ring body
02/13/1990US4900238 Scroll type compressor with releasably secured hermetic housing
01/1990
01/17/1990EP0350524A1 Multiple gear shift assembly for rotary vacuum pumps
01/09/1990US4893044 Rotor balancing
01/04/1990DE3921423A1 Compression device having an outer housing with a double weld layer, and method for welding an outer housing and a compression unit
01/03/1990EP0349170A2 Supercharger with torsion damping mechanism
01/03/1990EP0348936A2 A scroll gas compressor
01/03/1990EP0348601A2 Scroll compressor
12/1989
12/28/1989WO1989012751A1 Multi-stage vacuum-pump set
12/27/1989EP0347706A1 Multistage vacuum pump unit
12/26/1989US4889475 Twin rotary compressor with suction accumulator
12/14/1989WO1989012169A1 Vacuum pump unit arranged on a transportable support frame
12/14/1989DE3819692A1 Dry-running slide vane rotary vacuum pump
12/12/1989US4886435 Scroll compressor with intermittent oil supply passage
12/12/1989US4886434 Scroll compressor having discharge part communicating with two compression spaces simultaneously
12/12/1989US4886427 Hermetic scroll compressor with passage group for discharged fluid
12/05/1989US4884955 Scroll compressor having oil-actuated compliance mechanism
11/1989
11/21/1989US4881879 Rotary compressor gas routing for muffler system
11/15/1989EP0341407A2 Scroll compressor top cover plate
11/15/1989EP0341402A2 Scroll compressor having oil actuated compliance mechanism
11/01/1989CN1005642B Process for production of vaccum
10/1989
10/31/1989US4877382 Scroll-type machine with axially compliant mounting
10/25/1989EP0338835A2 Scroll type compressor
10/18/1989EP0337681A2 Vacuum pump systems
10/05/1989DE3809929A1 Liquid ring vacuum pump
09/1989
09/20/1989EP0332741A1 Multistage vacuum pump
09/19/1989US4867657 Scroll compressor with axially balanced shaft
09/19/1989US4867652 Balanced rolling rotor motor compressor
09/12/1989US4865531 Scroll compressor with super-charging tube
08/1989
08/16/1989CN1034790A 涡旋式压缩机 Scroll compressor
08/08/1989US4854831 Scroll compressor with plural discharge flow paths
07/1989
07/19/1989EP0324645A2 Hermetic scroll type compressor
07/06/1989DE3842886A1 Vacuum pump stand
07/05/1989EP0322894A2 Scroll compressor
07/05/1989EP0322561A2 Hermetic compressor assembly
07/05/1989EP0322531A2 Rotary compressor gas routing for muffler system
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