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| Number | Title | Issue Date |
| 7361004 | Compression unit of orbiting vane compressor Disclosed herein is a compression unit of an orbiting vane compressor. The compression unit comprises a circular operation space formed in a cylinder, the circular operation space having opposite ends, a circular vane disposed in the operation space for performing a... | 04/22/2008 |
| 7255546 | Spindle for a vane motor The spindle of a vane motor is designed to enhance the power, speed and torque by undercutting the spindle adjacent to the vanes on the power stroke side to increase the working area of the vanes and by adding slots intermediate the vane formed in said spindle and e... | 08/14/2007 |
| 6893241 | Compressor A compressor comprising a hermetic casing, a cylinder assembly disposed in the casing, a Z-plate disposed in the cylinder assembly for dividing an inner space of the cylinder assembly into a plurality of compression spaces, and sucking, compressing and discharging a... | 05/17/2005 |
| 6164943 | Internal geared wheel pump without crescent-shaped [sickle] piece An internal geared wheel pump that does not have a crescent shaped piece. The pump has an internal geared wheel that meshes with a pinion. The pinion and geared wheel are mounted in a rotatable manner in a housing that has a suction connection and a press... | 12/26/2000 |
| 6095782 | Crescentless internal gear pump A crescentless internal gear pump includes a housing with an intake connection and a pressure connection. An internally toothed internal gear has an outside surface and is disposed for rotation within the housing. Each tooth includes a head and a base, th... | 08/01/2000 |
| 5785509 | Wellbore motor system A drilling motor has been developed with a hollow tubular stator having at least one rod recess therein and an inlet port therethrough corresponding to each of the at least one rod recess; a rod movably disposed in each of the at least one rod recess; a t... | 07/28/1998 |
| 5769619 | Tracked rotary positive displacement device A rotary device containing a housing with a curved inner surface in the shape of a trochoid and an interior wall, an eccentric mounted on a shaft disposed within the housing, a rotor mounted on the eccentric shaft and several pins attached to the rotor an... | 06/23/1998 |
| 5540573 | Sickleless internal gear pump having sealing elements in tooth heads The invention is directed to a sickleless internal gear pump with an internal ring gear and a pinion meshing with the ring gear. The ring gear has radial apertures for the medium being pumped, and sealing elements radially movably disposed in an appropria... | 07/30/1996 |
| 5518379 | Downhole motor system A drilling motor has been developed with a hollow tubular stator having at least one rod recess therein and an exhaust port therethrough corresponding to each of the at least one rod recess; a rod movably disposed in each of the at least one rod recess; a... | 05/21/1996 |
| 5451150 | Sickleless internal gear pump with cross-sectionally mushroom-shaped sealing elements inserted in the tooth head The invention relates to a sickleless internal gear pump with an internally toothed ring gear and a pinion meshing with the ring gear. The pinion and ring gear are rotatably mounted in a housing having a suction port and a pressure port. The ring gear inc... | 09/19/1995 |
| 5135371 | Internal gear pump with radial openings A crescent-less internal gear pump. The internally geared wheel has a plurality of radial openings from its peripheral surface into the tooth gaps at the tooth base. The axial width of the pinion and/or the internally geared wheel is at least as great as ... | 08/04/1992 |
| 4345886 | Rotary compressor with vanes in the housing and suction through the rotor A rotary compressor for compressing fluid. A housing having a cylindrical internal cavity is provided with vanes and delivery ports. A rotor is rotatably mounted in the housing. The rotor has a portion for making a sealing contact with the inner periphera... | 08/24/1982 |
| 4296936 | Seal mechanism for the rotor periphery of a rotary piston engine A seal mechanism for the periphery of the rotor of a rotary piston engine including a sealing ledge supported on the rotor to be pivotable about an axis extending in the longitudinal directional thereof and operative to make sealing contact with an oppose... | 10/27/1981 |
| 4228932 | Sealing structure for rotary valves A sealing structure for a rotary valve including a rotary member having a plurality of pockets opening toward the outer periphery of a rotary member. A casing encloses the outer periphery of the rotary member. Sealing members are provided between the oute... | 10/21/1980 |
| 4138124 | Corner seal for rotary piston engines Corner seal for rotary piston engines comprising a substantially cylindrical body which is formed with a groove for accommodating an end of the apex seal. The corner seal has an end surface adapted to be brought into a slidable engagement with the inner s... | 02/06/1979 |
| 4137024 | Rotor for rotary piston mechanism The improved rotor is for a rotary compressor or expansion engine of the type having a rotor supported for planetation in a multi-lobe housing cavity and comprises an endless band embracing the peripheral surface of the rotor, which band functions to cont... | 01/30/1979 |
| 4008016 | Oil cooled seal for rotary engine An improved apex seal for a rotary engine of the type having a housing with an interior wall and a rotor having plural apices within the housing. A plurality of apex seals are provided, one at each of the apices on the rotor, for establishing a seal betwe... | 02/15/1977 |
| 3999905 | Rotary mechanism An improved rotary mechanism such as a rotary engine. The mechanism includes a main shaft with a rotor supporting portion thereon. A rotor is journalled on the supporting portion and has a plurality of apices. Each apex is provided with a seal retaining g... | 12/28/1976 |
| 3990819 | Seals for rotary mechanisms An improved rotary mechanism having a housing defining an operating chamber, a shaft journalled in the housing and extending through the chamber, a rotor journalled on the shaft and within the operating chamber, at least one seal receiving groove in the r... | 11/09/1976 |
| 3958906 | Rotary engine with modified trochoidally shaped inner wall A rotary engine of the trochoidal type in which the rotor and the profile of a basically trochoidally shaped inner housing wall bear such relationship to one another that when the differential in pressure in the flanking chambers is Greatest, the rotor ap... | 05/25/1976 |
